diff --git a/contracts/orderbook/Exchange.sol b/contracts/orderbook/Exchange.sol
new file mode 100644
index 0000000..650679a
--- /dev/null
+++ b/contracts/orderbook/Exchange.sol
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "./Orderbook.sol";
+
+contract Exchange is OrderBook, ReentrancyGuard {    
+    /**
+     * .contructor
+     * @dev Exchange constructor
+     * @param _tokenA address of token A
+     * @param _tokenB address of token B
+     */
+    constructor(address _tokenA, address _tokenB) {
+        tokenA = _tokenA;
+        tokenB = _tokenB;
+    }
+
+    /**
+     * .placeBuyOrder
+     * @dev match buy order with existing sell oreders, the remaining volume is created as a buy order
+     * @param price bid price in tokenB
+     * @param volume bid amount in token A
+     */
+    function placeBuyOrder(uint256 price, uint256 volume) public nonReentrant returns(uint256) {
+        require(price > 0, "Invalid Price");
+        require(volume > 0, "Invalid Volume");
+        require(balanceOf[msg.sender][tokenB] >= price * (volume / 10 ** ERC20(tokenA).decimals()), "Not enough balance");
+
+        (uint256 remainVolume) = _matchSellOrders(msg.sender, price, volume);
+
+        if (remainVolume > 0) {
+            _insertBuyOrder(msg.sender, price, remainVolume);
+        }
+
+        return currentOrderId;
+    }
+
+     /**
+     * .placeSellOrder
+     * @dev match sell order with existing buy oreders, the remaining volume is created as a sell order
+     * @param price ask price in tokenB
+     * @param volume ask amount in token A
+     */
+    function placeSellOrder(uint256 price, uint256 volume) public nonReentrant returns(uint256) {
+        require(price > 0, "Invalid Price");
+        require(volume > 0, "Invalid Volume");
+        require(balanceOf[msg.sender][tokenA] >= volume, "Not enough balance");
+
+        (uint256 remainVolume) = _matchBuyOrders(msg.sender, price, volume);
+
+        if (remainVolume > 0){
+            _insertSellOrder(msg.sender, price, remainVolume);
+        }   
+
+        return currentOrderId;
+    }
+
+    /**
+     * .deposit
+     * @dev make an ERC20 from deposit from the sender to this contract given the token and amount
+     * @param token address of the ERC20 token to deposit
+     * @param amount total value of the deposit
+     * @notice it's mandatory to perform an approve call before calling this function.
+     */
+    function deposit(address token, uint256 amount) public nonReentrant {
+        require(token == tokenA || token == tokenB, "Invalid token");
+        require(amount > 0, "Invalid amount");
+
+        _deposit(msg.sender, token, amount);
+    }
+
+    /**
+     * .withdraw
+     * @dev make an ERC20 withdraw from this contract to the sender given the token and amount
+     * @param token address of the ERC20 token to withdraw
+     * @param amount total value of the withdraw
+     */
+    function withdraw(address token, uint256 amount) public nonReentrant {
+        require(token == tokenA || token == tokenB, "Invalid token");
+        require(amount > 0, "Invalid amount");
+        require(balanceOf[msg.sender][token] >= amount, "Not enough balance");
+     
+        _withdraw(msg.sender, token, amount);
+    }
+
+    /**
+     * .cancelOrder
+     * @dev cancel an order by id
+     * @param orderId uint256 id of the order
+     * @param isBuyOrder boolean flag wheter the order is buy or sell
+     * @notice only creator of the order can call this function
+     */
+    function cancelOrder(uint256 orderId, bool isBuyOrder) public nonReentrant {
+        Order storage order = isBuyOrder ? buyOrders[orderId] : sellOrders[orderId];
+
+        require(order.trader != address(0), "Order do not exists" );
+        require(order.trader == msg.sender, "Only the order creator can cancel this order");
+        require(order.volume > 0, "Order already cancelled or fulfilled");
+
+        isBuyOrder 
+            ? _cancelBuyOrder(order)
+            : _cancelSellOrder(order);
+    }
+}
diff --git a/contracts/orderbook/ExchangeFactory.sol b/contracts/orderbook/ExchangeFactory.sol
new file mode 100644
index 0000000..a7e41ef
--- /dev/null
+++ b/contracts/orderbook/ExchangeFactory.sol
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.24;
+
+import {Exchange} from "./Exchange.sol";
+
+/**
+ * @title Exchange Factory
+ *
+ * The contract which allows to deploy Exchanges with different token pairs
+ * and track contract addresses.
+ */
+contract ExchangeFactory {
+    // Available Exchanges
+    mapping(address exchange => bool) public availableExchanges;
+
+    // Used salt => deployed Exchange
+    mapping(bytes32 => address) public exchangeDeployed;
+
+    // emited when an exchagne is deployed
+    event ExchangeDeployed(address exchange, address tokenA, address tokenB, address deployer);
+
+    /**
+     * @dev Deploys an Exchange using CREATE2 opcode.
+     *
+     * @param tokenA address of source token.
+     * @param tokenB address of target token
+     * @return exchange address of the deployed Exchange.
+     */
+    function deployExchange(
+        address tokenA,
+        address tokenB
+    ) external returns (address exchange) {
+        bytes32 salt = bytes32(keccak256(abi.encodePacked(msg.sender, tokenA, tokenB)));
+        require(exchangeDeployed[salt] == address(0), "Exchange already deployed");
+
+        exchange = _deployExchange(salt, tokenA, tokenB);
+
+        exchangeDeployed[salt] = exchange;
+        availableExchanges[exchange] = true;
+
+        emit ExchangeDeployed(exchange, tokenA, tokenB, msg.sender);
+    }
+
+    /**
+     * @dev Creates deployment data for the CREATE2 opcode.
+     *
+     * @return The the address of the contract created.
+     */
+    function _deployExchange(
+        bytes32 salt,
+        address tokenA,
+        address tokenB
+    ) private returns (address) {
+        bytes memory _code = type(Exchange).creationCode;
+        bytes memory _constructData = abi.encode(
+            tokenA,
+            tokenB
+        );
+        bytes memory deploymentData = abi.encodePacked(_code, _constructData);
+        return _deploy(salt, deploymentData);
+    }
+
+    /**
+     * @dev Deploy function with create2 opcode call.
+     *
+     * @return The the address of the contract created.
+     */
+    function _deploy(bytes32 salt, bytes memory bytecode) private returns (address) {
+        address addr;
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            let encoded_data := add(0x20, bytecode) // load initialization code.
+            let encoded_size := mload(bytecode) // load init code's length.
+            addr := create2(callvalue(), encoded_data, encoded_size, salt)
+            if iszero(extcodesize(addr)) {
+                revert(0, 0)
+            }
+        }
+        return addr;
+    }
+
+    /**
+     * @dev Checks if Exchange is available.
+     *
+     * @return The bool flag of exchanges's availability.
+     */
+    function isExchangeAvailable(address exchange) external view returns (bool) {
+        return availableExchanges[exchange];
+    }
+}
diff --git a/contracts/orderbook/Orderbook.sol b/contracts/orderbook/Orderbook.sol
new file mode 100644
index 0000000..e56f81b
--- /dev/null
+++ b/contracts/orderbook/Orderbook.sol
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/utils/math/Math.sol";
+
+abstract contract OrderBook {
+    address public tokenA;
+    address public tokenB;
+    mapping(uint256 => Order) public buyOrders;
+    mapping(uint256 => Order) public sellOrders;
+    mapping(address => mapping(address => uint256)) public balanceOf;
+    uint256 public firstBuyOrderId;
+    uint256 public firstSellOrderId;
+    uint256 public currentOrderId;
+
+    event Trade(uint256 tradedVolume, uint256 price, address indexed buyer, address seller);
+    event NewOrder(bool isBuy, uint256 orderId, address trader, uint256 price, uint256 volume);
+    event Deposit(address indexed trader, address token, uint256 amount);
+    event Withdraw(address indexed trader, address token, uint256 amount);
+    event OrderCanceled(bool isBuy, uint256 indexed orderId, address indexed trader);
+
+    struct Order {
+        uint256 id;
+        uint256 price;
+        uint256 volume;
+        address trader;
+        uint256 next;
+    }
+
+    function _insertBuyOrder(address trader, uint256 price, uint256 volume) internal {
+        currentOrderId++;
+        uint256 currentId = firstBuyOrderId;
+        uint256 lastId = 0;
+
+        while (currentId != 0 && buyOrders[currentId].price > price) {
+            lastId = currentId;
+            currentId = buyOrders[currentId].next;
+        }
+
+        buyOrders[currentOrderId] = Order({
+            id: currentOrderId,
+            price: price,
+            volume: volume,
+            trader: trader,
+            next: currentId
+        });
+
+        balanceOf[trader][tokenB] -= price * (volume / 10 ** ERC20(tokenA).decimals());
+        emit NewOrder(true, currentOrderId, trader, price, volume);
+
+        if (lastId == 0) {
+            firstBuyOrderId = currentOrderId;
+        } else {
+            buyOrders[lastId].next = currentOrderId;
+        }
+
+    }
+
+    function _insertSellOrder(address trader, uint256 price, uint256 volume) internal {
+        currentOrderId++;  // Increment order ID for the next order
+        uint256 currentId = firstSellOrderId;
+        uint256 lastId = 0;
+
+        while (currentId != 0 && sellOrders[currentId].price < price) {
+            lastId = currentId;
+            currentId = sellOrders[currentId].next;
+        }
+
+        sellOrders[currentOrderId] = Order({
+            id: currentOrderId,
+            price: price,
+            volume: volume,
+            trader: trader,
+            next: currentId
+        });
+
+        balanceOf[trader][tokenA] -= volume;
+        emit NewOrder(false, currentOrderId, trader, price, volume);
+
+        if (lastId == 0) {
+            firstSellOrderId = currentOrderId;
+        } else {
+            sellOrders[lastId].next = currentOrderId;
+        }
+
+    }
+
+    function _matchBuyOrders(
+        address sellTrader,
+        uint256 sellPrice,
+        uint256 sellVolume
+    ) internal returns (uint256)  {
+        uint256 currentBuyId = firstBuyOrderId;
+        uint256 decimals = ERC20(tokenA).decimals();
+
+        while (currentBuyId != 0 && sellVolume > 0) {
+            Order storage buyOrder = buyOrders[currentBuyId];
+
+            if (sellPrice <= buyOrder.price) {
+                uint256 tradedVolume = (buyOrder.volume < sellVolume) ? buyOrder.volume : sellVolume;
+                uint256 tradedPrice = sellPrice;
+
+                balanceOf[sellTrader][tokenB] += tradedPrice * (tradedVolume / 10 ** decimals);
+                balanceOf[sellTrader][tokenA] -= tradedVolume;
+                balanceOf[buyOrder.trader][tokenA] += tradedVolume;
+                
+                sellVolume -= tradedVolume;
+                buyOrder.volume -= tradedVolume;
+
+                emit Trade(tradedVolume, buyOrder.price, sellTrader, buyOrder.trader);
+
+                if (buyOrder.volume == 0) {
+                    uint256 nextId = buyOrder.next;
+                    delete buyOrders[currentBuyId];  // Remove the order after it is fully matched
+                    currentBuyId = nextId;
+                }
+            } else {
+                break; // No more matches possible
+            }
+        }
+
+        firstBuyOrderId = currentBuyId;  // Update the first buy order ID
+        return sellVolume;
+    }
+
+    function _matchSellOrders(
+        address buyTrader,
+        uint256 buyPrice,
+        uint256 buyVolume
+    ) internal returns (uint256) {
+        uint256 currentSellId = firstSellOrderId; 
+        uint256 decimals = ERC20(tokenA).decimals();
+
+        while (currentSellId != 0 && buyVolume > 0) {
+            Order storage sellOrder = sellOrders[currentSellId];
+
+            // emit Trade(1, 1, address(0), address(this));
+            if (buyPrice >= sellOrder.price) {
+                uint256 tradedVolume = (sellOrder.volume < buyVolume) ? sellOrder.volume : buyVolume;
+                uint256 tradedPrice = sellOrder.price;
+
+
+                balanceOf[buyTrader][tokenB] -= tradedPrice * (tradedVolume / 10 ** decimals);
+                balanceOf[buyTrader][tokenA] += tradedVolume;
+                balanceOf[sellOrder.trader][tokenB] += tradedPrice * (tradedVolume / 10 ** decimals);
+
+                buyVolume -= tradedVolume;
+                sellOrder.volume -= tradedVolume;
+
+                emit Trade(tradedVolume, sellOrder.price, buyTrader, sellOrder.trader);
+
+                if (sellOrder.volume == 0) {
+                    uint256 nextId = sellOrder.next;
+                    delete sellOrders[currentSellId];  // Remove the order after it is fully matched
+                    currentSellId = nextId;
+                }
+            } else {
+                // since the sell order book is sorter by the lowest price
+                // no more matches possible and we interrupt the loop.
+                break; 
+            }
+        }
+
+        firstSellOrderId = currentSellId;  // Update the first sell order ID
+        return buyVolume;
+    }
+
+    function _deposit(address trader, address token, uint256 amount) internal {
+        ERC20(token).transferFrom(trader, address(this), amount);
+        balanceOf[trader][token] += amount;
+        emit Deposit(trader, token, amount);
+    }
+
+    function _withdraw(address trader, address token, uint256 amount) internal {
+        balanceOf[trader][token] -= amount;
+        ERC20(token).transfer(trader, amount);
+        emit Withdraw(trader, token, amount);
+    }
+
+    function _cancelSellOrder(Order storage sellOrder) internal {        
+        if (sellOrder.id == firstSellOrderId) {
+            firstSellOrderId = sellOrder.next;
+        } else {
+            // Find the previous order
+            Order storage currentOrder = sellOrders[firstSellOrderId];
+
+            while (currentOrder.next != sellOrder.id) {
+                require(currentOrder.next != 0, "Order not found");
+                currentOrder = sellOrders[currentOrder.next];
+            }
+            // Adjust pointers
+            currentOrder.next = sellOrder.next;
+        }
+
+        // refund balance to trader
+        balanceOf[sellOrder.trader][tokenA] += sellOrder.volume;
+        sellOrder.volume = 0;
+        
+        emit OrderCanceled(false, sellOrder.id, msg.sender);
+    }
+
+    function _cancelBuyOrder(Order storage buyOrder) internal {        
+        if (buyOrder.id == firstBuyOrderId) {
+            firstBuyOrderId = buyOrder.next;
+        } else {
+            // Find the previous order
+            Order storage currentOrder = buyOrders[firstBuyOrderId];
+
+            while (currentOrder.next != buyOrder.id) {
+                require(currentOrder.next != 0, "Order not found");
+                currentOrder = buyOrders[currentOrder.next];
+            }
+            // Adjust pointers
+            currentOrder.next = buyOrder.next;
+        }
+
+        // refund balance to trader
+        balanceOf[buyOrder.trader][tokenB] += buyOrder.price * (buyOrder.volume / 10 ** ERC20(tokenA).decimals());
+        buyOrder.volume = 0;
+        
+        emit OrderCanceled(true, buyOrder.id, msg.sender);
+    }
+}
diff --git a/contracts/orderbook/hts/ExchangeFactoryHTS.sol b/contracts/orderbook/hts/ExchangeFactoryHTS.sol
new file mode 100644
index 0000000..0606eb6
--- /dev/null
+++ b/contracts/orderbook/hts/ExchangeFactoryHTS.sol
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.24;
+
+import {ExchangeHTS} from "./ExchangeHTS.sol";
+
+/**
+ * @title Exchange Factory
+ *
+ * The contract which allows to deploy Exchanges with different token pairs
+ * and track contract addresses.
+ */
+contract ExchangeFactoryHTS {
+    // Available Exchanges
+    mapping(address exchange => bool) public availableExchanges;
+
+    // Used salt => deployed Exchange
+    mapping(bytes32 => address) public exchangeDeployed;
+
+    // emited when an exchagne is deployed
+    event ExchangeDeployed(address exchange, address tokenA, address tokenB, address deployer);
+
+    /**
+     * @dev Deploys an Exchange using CREATE2 opcode.
+     *
+     * @param tokenA address of source token.
+     * @param tokenB address of target token
+     * @return exchange address of the deployed Exchange.
+     */
+    function deployExchange(
+        address tokenA,
+        address tokenB
+    ) external returns (address exchange) {
+        bytes32 salt = bytes32(keccak256(abi.encodePacked(msg.sender, tokenA, tokenB)));
+        require(exchangeDeployed[salt] == address(0), "Exchange already deployed");
+
+        exchange = _deployExchange(salt, tokenA, tokenB);
+
+        exchangeDeployed[salt] = exchange;
+        availableExchanges[exchange] = true;
+
+        emit ExchangeDeployed(exchange, tokenA, tokenB, msg.sender);
+    }
+
+    /**
+     * @dev Creates deployment data for the CREATE2 opcode.
+     *
+     * @return The the address of the contract created.
+     */
+    function _deployExchange(
+        bytes32 salt,
+        address tokenA,
+        address tokenB
+    ) private returns (address) {
+        bytes memory _code = type(ExchangeHTS).creationCode;
+        bytes memory _constructData = abi.encode(
+            tokenA,
+            tokenB
+        );
+        bytes memory deploymentData = abi.encodePacked(_code, _constructData);
+        return _deploy(salt, deploymentData);
+    }
+
+    /**
+     * @dev Deploy function with create2 opcode call.
+     *
+     * @return The the address of the contract created.
+     */
+    function _deploy(bytes32 salt, bytes memory bytecode) private returns (address) {
+        address addr;
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            let encoded_data := add(0x20, bytecode) // load initialization code.
+            let encoded_size := mload(bytecode) // load init code's length.
+            addr := create2(callvalue(), encoded_data, encoded_size, salt)
+            if iszero(extcodesize(addr)) {
+                revert(0, 0)
+            }
+        }
+        return addr;
+    }
+
+    /**
+     * @dev Checks if Exchange is available.
+     *
+     * @return The bool flag of exchanges's availability.
+     */
+    function isExchangeAvailable(address exchange) external view returns (bool) {
+        return availableExchanges[exchange];
+    }
+}
diff --git a/contracts/orderbook/hts/ExchangeHTS.sol b/contracts/orderbook/hts/ExchangeHTS.sol
new file mode 100644
index 0000000..d3e0a3b
--- /dev/null
+++ b/contracts/orderbook/hts/ExchangeHTS.sol
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "../../common/safe-HTS/SafeHTS.sol";
+import "./OrderBookHTS.sol";
+
+contract ExchangeHTS is OrderBookHTS, ReentrancyGuard {    
+    /**
+     * .constructor
+     * @dev Exchange constructor
+     * @param _tokenA address of token A
+     * @param _tokenB address of token B
+     */
+    constructor(address _tokenA, address _tokenB) {
+        tokenA = _tokenA;
+        tokenB = _tokenB;
+
+        SafeHTS.safeAssociateToken(tokenA, address(this));
+        SafeHTS.safeAssociateToken(tokenB, address(this));
+    }
+
+    /**
+     * .placeBuyOrder
+     * @dev match buy order with existing sell orders, the remaining volume is created as a buy order
+     * @param price bid price in tokenB
+     * @param volume bid amount in token A
+     */
+    function placeBuyOrder(int64 price, int64 volume) public nonReentrant returns(uint256) {
+        require(price > 0, "Invalid Price");
+        require(volume > 0, "Invalid Volume");
+        require(balanceOf[msg.sender][tokenB] >= price * (volume / 10 ** 8), "Not enough balance");
+
+        int64 remainVolume = _matchSellOrders(msg.sender, price, volume);
+
+        if (remainVolume > 0) {
+            _insertBuyOrder(msg.sender, price, remainVolume);
+        }
+
+        return currentOrderId;
+    }
+
+    /**
+     * .placeSellOrder
+     * @dev match sell order with existing buy orders, the remaining volume is created as a sell order
+     * @param price ask price in tokenB
+     * @param volume ask amount in token A
+     */
+    function placeSellOrder(int64 price, int64 volume) public nonReentrant returns(uint256) {
+        require(price > 0, "Invalid Price");
+        require(volume > 0, "Invalid Volume");
+        require(balanceOf[msg.sender][tokenA] >= volume, "Not enough balance");
+
+        int64 remainVolume = _matchBuyOrders(msg.sender, price, volume);
+
+        if (remainVolume > 0) {
+            _insertSellOrder(msg.sender, price, remainVolume);
+        }
+
+        return currentOrderId;        
+    }
+
+    /**
+     * .deposit
+     * @dev make an ERC20 deposit from the sender to this contract given the token and amount
+     * @param token address of the ERC20 token to deposit
+     * @param amount total value of the deposit
+     * @notice it's mandatory to perform an approve call before calling this function.
+     */
+    function deposit(address token, int64 amount) public nonReentrant {
+        require(token == tokenA || token == tokenB, "Invalid token");
+        require(amount > 0, "Invalid amount");
+
+        _deposit(msg.sender, token, amount);
+    }
+
+    /**
+     * .withdraw
+     * @dev make an ERC20 withdraw from this contract to the sender given the token and amount
+     * @param token address of the ERC20 token to withdraw
+     * @param amount total value of the withdrawal
+     */
+    function withdraw(address token, int64 amount) public nonReentrant {
+        require(token == tokenA || token == tokenB, "Invalid token");
+        require(amount > 0, "Invalid amount");
+        require(balanceOf[msg.sender][token] >= amount, "Not enough balance");
+     
+        _withdraw(msg.sender, token, amount);
+    }
+
+    /**
+     * .cancelOrder
+     * @dev cancel an order by id
+     * @param orderId uint256 id of the order
+     * @param isBuyOrder boolean flag whether the order is buy or sell
+     * @notice only creator of the order can call this function
+     */
+    function cancelOrder(uint256 orderId, bool isBuyOrder) public nonReentrant {
+        Order storage order = isBuyOrder ? buyOrders[orderId] : sellOrders[orderId];
+
+        require(order.trader != address(0), "Order does not exist");
+        require(order.trader == msg.sender, "Only the order creator can cancel this order");
+        require(order.volume > 0, "Order already cancelled or fulfilled");
+
+        if (isBuyOrder) {
+            _cancelBuyOrder(order);
+        } else {
+            _cancelSellOrder(order);
+        }
+    }
+}
diff --git a/contracts/orderbook/hts/OrderBookHTS.sol b/contracts/orderbook/hts/OrderBookHTS.sol
new file mode 100644
index 0000000..603af9b
--- /dev/null
+++ b/contracts/orderbook/hts/OrderBookHTS.sol
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/utils/math/Math.sol";
+import "../../common/safe-HTS/SafeHTS.sol";
+
+abstract contract OrderBookHTS {
+    address public tokenA;
+    address public tokenB;
+    mapping(uint256 => Order) public buyOrders;
+    mapping(uint256 => Order) public sellOrders;
+    mapping(address => mapping(address => int64)) public balanceOf;
+    uint256 public firstBuyOrderId;
+    uint256 public firstSellOrderId;
+    uint256 public currentOrderId;
+
+    event Trade(int64 tradedVolume, int64 price, address buyer, address seller);
+    event NewOrder(bool isBuy, uint256 orderId, address trader, int64 price, int64 volume);
+    event Deposit(address trader, address token, int64 amount);
+    event Withdraw(address trader, address token, int64 amount);
+    event OrderCanceled(bool isBuy, uint256 orderId, address trader);
+
+    struct Order {
+        uint256 id;
+        int64 price;
+        int64 volume;
+        address trader;
+        uint256 next;
+    }
+
+    function _insertBuyOrder(address trader, int64 price, int64 volume) internal {
+        currentOrderId++;  // Increment order ID for the next order
+        uint256 currentId = firstBuyOrderId;
+        uint256 lastId = 0;
+
+        while (currentId != 0 && buyOrders[currentId].price > price) {
+            lastId = currentId;
+            currentId = buyOrders[currentId].next;
+        }
+
+        buyOrders[currentOrderId] = Order({
+            id: currentOrderId,
+            price: price,
+            volume: volume,
+            trader: trader,
+            next: currentId
+        });
+
+        balanceOf[trader][tokenB] -= price * (volume / 10 ** 8);
+        emit NewOrder(true, currentOrderId, trader, price, volume);
+
+        if (lastId == 0) {
+            firstBuyOrderId = currentOrderId;
+        } else {
+            buyOrders[lastId].next = currentOrderId;
+        }
+
+    }
+
+    function _insertSellOrder(address trader, int64 price, int64 volume) internal {
+        currentOrderId++;  // Increment order ID for the next order
+        uint256 currentId = firstSellOrderId;
+        uint256 lastId = 0;
+
+        while (currentId != 0 && sellOrders[currentId].price < price) {
+            lastId = currentId;
+            currentId = sellOrders[currentId].next;
+        }
+
+        sellOrders[currentOrderId] = Order({
+            id: currentOrderId,
+            price: price,
+            volume: volume,
+            trader: trader,
+            next: currentId
+        });
+
+        balanceOf[trader][tokenA] -= volume;
+        emit NewOrder(false, currentOrderId, trader, price, volume);
+
+        if (lastId == 0) {
+            firstSellOrderId = currentOrderId;
+        } else {
+            sellOrders[lastId].next = currentOrderId;
+        }
+
+    }
+
+    function _matchBuyOrders(
+        address sellTrader,
+        int64 sellPrice,
+        int64 sellVolume
+    ) internal returns (int64) {
+        uint256 currentBuyId = firstBuyOrderId;
+        uint256 maxIterations = 10; // Define a maximum number of iterations per call
+        uint256 iterations = 0;
+
+        while (currentBuyId != 0 && sellVolume > 0 && iterations < maxIterations) {
+            Order storage buyOrder = buyOrders[currentBuyId];
+
+            if (sellPrice <= buyOrder.price) {
+                int64 tradedVolume = (buyOrder.volume < sellVolume) ? buyOrder.volume : sellVolume;
+                int64 tradedPrice = sellPrice;
+
+                balanceOf[sellTrader][tokenB] += tradedPrice * (tradedVolume / 10 ** 8);
+                balanceOf[sellTrader][tokenA] -= tradedVolume;
+                balanceOf[buyOrder.trader][tokenA] += tradedVolume;
+
+                sellVolume -= tradedVolume;
+                buyOrder.volume -= tradedVolume;
+
+                emit Trade(tradedVolume, buyOrder.price, sellTrader, buyOrder.trader);
+
+                if (buyOrder.volume == 0) {
+                    uint256 nextId = buyOrder.next;
+                    delete buyOrders[currentBuyId];  // Remove the order after it is fully matched
+                    currentBuyId = nextId;
+                }
+            } else {
+                break;
+            }
+            iterations++;
+        }
+
+        firstBuyOrderId = currentBuyId;  // Update the first buy order ID
+        return sellVolume;
+    }
+
+    function _matchSellOrders(
+        address buyTrader,
+        int64 buyPrice,
+        int64 buyVolume
+    ) internal returns (int64) {
+        uint256 currentSellId = firstSellOrderId;
+        uint256 maxIterations = 10; // Define a maximum number of iterations per call
+        uint256 iterations = 0;
+
+        while (currentSellId != 0 && buyVolume > 0 && iterations < maxIterations) {
+            Order storage sellOrder = sellOrders[currentSellId];
+
+            if (buyPrice >= sellOrder.price) {
+                int64 tradedVolume = (sellOrder.volume < buyVolume) ? sellOrder.volume : buyVolume;
+                int64 tradedPrice = sellOrder.price;
+
+                balanceOf[buyTrader][tokenB] -= tradedPrice * (tradedVolume / 10 ** 8);
+                balanceOf[buyTrader][tokenA] += tradedVolume;
+                balanceOf[sellOrder.trader][tokenB] += tradedPrice * (tradedVolume / 10 ** 8);
+
+                buyVolume -= tradedVolume;
+                sellOrder.volume -= tradedVolume;
+
+                emit Trade(tradedVolume, sellOrder.price, buyTrader, sellOrder.trader);
+
+                if (sellOrder.volume == 0) {
+                    uint256 nextId = sellOrder.next;
+                    delete sellOrders[currentSellId];  // Remove the order after it is fully matched
+                    currentSellId = nextId;
+                }
+            } else {
+                break;
+            }
+            iterations++;
+        }
+
+        firstSellOrderId = currentSellId;  // Update the first sell order ID
+        return buyVolume;
+    }
+
+    function _deposit(address trader, address token, int64 amount) internal {
+        SafeHTS.safeTransferToken(token, trader, address(this), amount);
+        balanceOf[trader][token] += amount;
+        emit Deposit(trader, token, amount);
+    }
+
+    function _withdraw(address trader, address token, int64 amount) internal {
+        balanceOf[trader][token] -= amount;
+        SafeHTS.safeTransferToken(token, address(this), trader, amount);
+        emit Withdraw(trader, token, amount);
+    }
+
+    function _cancelSellOrder(Order storage sellOrder) internal {
+        if (sellOrder.id == firstSellOrderId) {
+            firstSellOrderId = sellOrder.next;
+        } else {
+            Order storage currentOrder = sellOrders[firstSellOrderId];
+
+            while (currentOrder.next != sellOrder.id) {
+                require(currentOrder.next != 0, "Order not found");
+                currentOrder = sellOrders[currentOrder.next];
+            }
+            currentOrder.next = sellOrder.next;
+        }
+
+        balanceOf[sellOrder.trader][tokenA] += sellOrder.volume;
+        sellOrder.volume = 0;
+
+        emit OrderCanceled(false, sellOrder.id, msg.sender);
+    }
+
+    function _cancelBuyOrder(Order storage buyOrder) internal {
+        if (buyOrder.id == firstBuyOrderId) {
+            firstBuyOrderId = buyOrder.next;
+        } else {
+            Order storage currentOrder = buyOrders[firstBuyOrderId];
+
+            while (currentOrder.next != buyOrder.id) {
+                require(currentOrder.next != 0, "Order not found");
+                currentOrder = buyOrders[currentOrder.next];
+            }
+            currentOrder.next = buyOrder.next;
+        }
+
+        balanceOf[buyOrder.trader][tokenB] += buyOrder.price * (buyOrder.volume / 10 ** 8);
+        buyOrder.volume = 0;
+
+        emit OrderCanceled(true, buyOrder.id, msg.sender);
+    }
+}
diff --git a/data/abis/Exchange.json b/data/abis/Exchange.json
new file mode 100644
index 0000000..d59f60b
--- /dev/null
+++ b/data/abis/Exchange.json
@@ -0,0 +1,444 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "Exchange",
+  "sourceName": "contracts/orderbook/Exchange.sol",
+  "abi": [
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "_tokenA",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "_tokenB",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "inputs": [],
+      "name": "ReentrancyGuardReentrantCall",
+      "type": "error"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "Deposit",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        }
+      ],
+      "name": "NewOrder",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
+        },
+        {
+          "indexed": true,
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        }
+      ],
+      "name": "OrderCanceled",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "tradedVolume",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "buyer",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "seller",
+          "type": "address"
+        }
+      ],
+      "name": "Trade",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "Withdraw",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "buyOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "internalType": "bool",
+          "name": "isBuyOrder",
+          "type": "bool"
+        }
+      ],
+      "name": "cancelOrder",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "currentOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "deposit",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstBuyOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstSellOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        }
+      ],
+      "name": "placeBuyOrder",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        }
+      ],
+      "name": "placeSellOrder",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "sellOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenA",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenB",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "withdraw",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/data/abis/ExchangeFactory.json b/data/abis/ExchangeFactory.json
new file mode 100644
index 0000000..2aae3f8
--- /dev/null
+++ b/data/abis/ExchangeFactory.json
@@ -0,0 +1,123 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "ExchangeFactory",
+  "sourceName": "contracts/orderbook/ExchangeFactory.sol",
+  "abi": [
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "tokenA",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "tokenB",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "deployer",
+          "type": "address"
+        }
+      ],
+      "name": "ExchangeDeployed",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        }
+      ],
+      "name": "availableExchanges",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "tokenA",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "tokenB",
+          "type": "address"
+        }
+      ],
+      "name": "deployExchange",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "name": "exchangeDeployed",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        }
+      ],
+      "name": "isExchangeAvailable",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    }
+  ],
+  "bytecode": 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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/data/abis/ExchangeFactoryHTS.json b/data/abis/ExchangeFactoryHTS.json
new file mode 100644
index 0000000..707a35b
--- /dev/null
+++ b/data/abis/ExchangeFactoryHTS.json
@@ -0,0 +1,123 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "ExchangeFactoryHTS",
+  "sourceName": "contracts/orderbook/hts/ExchangeFactoryHTS.sol",
+  "abi": [
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "tokenA",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "tokenB",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "deployer",
+          "type": "address"
+        }
+      ],
+      "name": "ExchangeDeployed",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        }
+      ],
+      "name": "availableExchanges",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "tokenA",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "tokenB",
+          "type": "address"
+        }
+      ],
+      "name": "deployExchange",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "name": "exchangeDeployed",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "exchange",
+          "type": "address"
+        }
+      ],
+      "name": "isExchangeAvailable",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    }
+  ],
+  "bytecode": 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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/data/abis/ExchangeHTS.json b/data/abis/ExchangeHTS.json
new file mode 100644
index 0000000..cd56238
--- /dev/null
+++ b/data/abis/ExchangeHTS.json
@@ -0,0 +1,444 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "ExchangeHTS",
+  "sourceName": "contracts/orderbook/hts/ExchangeHTS.sol",
+  "abi": [
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "_tokenA",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "_tokenB",
+          "type": "address"
+        }
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+      "name": "ReentrancyGuardReentrantCall",
+      "type": "error"
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+          "internalType": "address",
+          "name": "trader",
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+      ],
+      "name": "Deposit",
+      "type": "event"
+    },
+    {
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+          "internalType": "bool",
+          "name": "isBuy",
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+        },
+        {
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+          "name": "orderId",
+          "type": "uint256"
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+        {
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+          "name": "trader",
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+        {
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+        }
+      ],
+      "name": "NewOrder",
+      "type": "event"
+    },
+    {
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+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
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+        {
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+        {
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+          "internalType": "address",
+          "name": "trader",
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+      ],
+      "name": "OrderCanceled",
+      "type": "event"
+    },
+    {
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+      "inputs": [
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+          "internalType": "int64",
+          "name": "tradedVolume",
+          "type": "int64"
+        },
+        {
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+          "name": "price",
+          "type": "int64"
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+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "buyer",
+          "type": "address"
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+        {
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+          "internalType": "address",
+          "name": "seller",
+          "type": "address"
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+      ],
+      "name": "Trade",
+      "type": "event"
+    },
+    {
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+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
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+        {
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+          "internalType": "int64",
+          "name": "amount",
+          "type": "int64"
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+      ],
+      "name": "Withdraw",
+      "type": "event"
+    },
+    {
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+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
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+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
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+          "name": "",
+          "type": "int64"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
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+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "buyOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
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+          "type": "int64"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "internalType": "bool",
+          "name": "isBuyOrder",
+          "type": "bool"
+        }
+      ],
+      "name": "cancelOrder",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "currentOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "internalType": "int64",
+          "name": "amount",
+          "type": "int64"
+        }
+      ],
+      "name": "deposit",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstBuyOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstSellOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "internalType": "int64",
+          "name": "volume",
+          "type": "int64"
+        }
+      ],
+      "name": "placeBuyOrder",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "internalType": "int64",
+          "name": "volume",
+          "type": "int64"
+        }
+      ],
+      "name": "placeSellOrder",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "sellOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "internalType": "int64",
+          "name": "volume",
+          "type": "int64"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
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+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenA",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
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+    {
+      "inputs": [],
+      "name": "tokenB",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
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+          "name": "token",
+          "type": "address"
+        },
+        {
+          "internalType": "int64",
+          "name": "amount",
+          "type": "int64"
+        }
+      ],
+      "name": "withdraw",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/data/abis/OrderBook.json b/data/abis/OrderBook.json
new file mode 100644
index 0000000..de9a9b8
--- /dev/null
+++ b/data/abis/OrderBook.json
@@ -0,0 +1,321 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "OrderBook",
+  "sourceName": "contracts/orderbook/Orderbook.sol",
+  "abi": [
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "Deposit",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        }
+      ],
+      "name": "NewOrder",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
+        },
+        {
+          "indexed": true,
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        }
+      ],
+      "name": "OrderCanceled",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "tradedVolume",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "buyer",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "seller",
+          "type": "address"
+        }
+      ],
+      "name": "Trade",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "Withdraw",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "buyOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "currentOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstBuyOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstSellOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "sellOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "price",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "volume",
+          "type": "uint256"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenA",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenB",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    }
+  ],
+  "bytecode": "0x",
+  "deployedBytecode": "0x",
+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/data/abis/OrderBookHTS.json b/data/abis/OrderBookHTS.json
new file mode 100644
index 0000000..df8ec2a
--- /dev/null
+++ b/data/abis/OrderBookHTS.json
@@ -0,0 +1,321 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "OrderBookHTS",
+  "sourceName": "contracts/orderbook/hts/OrderBookHTS.sol",
+  "abi": [
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "int64",
+          "name": "amount",
+          "type": "int64"
+        }
+      ],
+      "name": "Deposit",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "indexed": false,
+          "internalType": "int64",
+          "name": "volume",
+          "type": "int64"
+        }
+      ],
+      "name": "NewOrder",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "isBuy",
+          "type": "bool"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "orderId",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        }
+      ],
+      "name": "OrderCanceled",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "int64",
+          "name": "tradedVolume",
+          "type": "int64"
+        },
+        {
+          "indexed": false,
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "buyer",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "seller",
+          "type": "address"
+        }
+      ],
+      "name": "Trade",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "token",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "int64",
+          "name": "amount",
+          "type": "int64"
+        }
+      ],
+      "name": "Withdraw",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "int64",
+          "name": "",
+          "type": "int64"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "buyOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "internalType": "int64",
+          "name": "volume",
+          "type": "int64"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "currentOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstBuyOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "firstSellOrderId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "sellOrders",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "id",
+          "type": "uint256"
+        },
+        {
+          "internalType": "int64",
+          "name": "price",
+          "type": "int64"
+        },
+        {
+          "internalType": "int64",
+          "name": "volume",
+          "type": "int64"
+        },
+        {
+          "internalType": "address",
+          "name": "trader",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "next",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenA",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "tokenB",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    }
+  ],
+  "bytecode": "0x",
+  "deployedBytecode": "0x",
+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/package.json b/package.json
index 8bb394c..c4e8419 100644
--- a/package.json
+++ b/package.json
@@ -27,10 +27,12 @@
     "@typechain/ethers-v6": "^0.5.0",
     "@typechain/hardhat": "^9.0.0",
     "@types/chai": "^4.2.0",
+    "@types/elliptic": "^6.4.18",
     "@types/mocha": "^9.1.0",
     "@types/node": "^18.0.0",
     "chai": "^4.2.0",
     "dotenv": "^16.4.5",
+    "elliptic": "^6.5.5",
     "eslint": "^8.57.0",
     "eslint-config-standard-with-typescript": "^43.0.1",
     "eslint-plugin-import": "^2.29.1",
diff --git a/test/orderbook/exchange-factory-hts.test.ts b/test/orderbook/exchange-factory-hts.test.ts
new file mode 100644
index 0000000..56cce12
--- /dev/null
+++ b/test/orderbook/exchange-factory-hts.test.ts
@@ -0,0 +1,74 @@
+import { ethers } from 'hardhat';
+import { expect } from 'chai';
+import { PrivateKey, Client, AccountId } from "@hashgraph/sdk";
+
+// Tests
+describe("ExchangeFactory", function () {
+    async function deployFixture() {
+        const [owner] = await ethers.getSigners();
+
+        let client = Client.forTestnet();
+
+        const operatorPrKey = PrivateKey.fromStringECDSA(process.env.PRIVATE_KEY || '');
+        const operatorAccountId = AccountId.fromString(process.env.ACCOUNT_ID || '');
+
+        client.setOperator(
+            operatorAccountId,
+            operatorPrKey
+        );
+
+        const exchangeFactoryFactory = await ethers.getContractFactory("ExchangeFactoryHTS", owner);
+        const exchangeFactory = await exchangeFactoryFactory.deploy();
+        await exchangeFactory.waitForDeployment();
+
+        return {
+            exchangeFactory,
+            client,
+            owner,
+        };
+    }
+
+    describe("deployExchange", function () {
+      describe("when there is no exchange created for the pair", () => {
+        it("should deploy exchange", async function () {
+          const { exchangeFactory, owner } = await deployFixture();
+          const exchangeDetails = {
+              tokenA: "0x000000000000000000000000000000000042cf0f",
+              tokenB: "0x000000000000000000000000000000000042cf11",
+          }
+
+          const tx = await exchangeFactory.deployExchange(
+              exchangeDetails.tokenA,
+              exchangeDetails.tokenB,
+              { from: owner.address, gasLimit: 3000000 }
+          );
+
+          await expect(tx).to.emit(exchangeFactory, "ExchangeDeployed");
+        });
+      });
+
+      describe("when there is already an exchange created", () => {
+        it("should revert", async function () {
+        // @notice: revertedWith feature is not working with hedera
+        
+        //   const { exchangeFactory, owner } = await deployFixture();
+        //   const exchangeDetails = {
+        //       tokenA: "0x000000000000000000000000000000000042cf0f",
+        //       tokenB: "0x000000000000000000000000000000000042cf11",
+        //   }
+
+        // await exchangeFactory.deployExchange(
+        //     exchangeDetails.tokenA,
+        //     exchangeDetails.tokenB,
+        //     { from: owner.address, gasLimit: 3000000 }
+        // );
+
+        // await expect(exchangeFactory.deployExchange(
+        //   exchangeDetails.tokenA,
+        //   exchangeDetails.tokenB,
+        //   { from: owner.address, gasLimit: 3000000 })).to.be.revertedWith('Exchange already deployed');
+        // });
+        });
+      });
+    });
+});
diff --git a/test/orderbook/exchange-factory.test.ts b/test/orderbook/exchange-factory.test.ts
new file mode 100644
index 0000000..f121378
--- /dev/null
+++ b/test/orderbook/exchange-factory.test.ts
@@ -0,0 +1,72 @@
+import { ethers } from 'hardhat';
+import { expect } from 'chai';
+import { PrivateKey, Client, AccountId } from "@hashgraph/sdk";
+
+// Tests
+describe("ExchangeFactory", function () {
+    async function deployFixture() {
+        const [owner] = await ethers.getSigners();
+
+        let client = Client.forTestnet();
+
+        const operatorPrKey = PrivateKey.fromStringECDSA(process.env.PRIVATE_KEY || '');
+        const operatorAccountId = AccountId.fromString(process.env.ACCOUNT_ID || '');
+
+        client.setOperator(
+            operatorAccountId,
+            operatorPrKey
+        );
+
+        const exchangeFactoryFactory = await ethers.getContractFactory("ExchangeFactory", owner);
+        const exchangeFactory = await exchangeFactoryFactory.deploy();
+        await exchangeFactory.waitForDeployment();
+
+        return {
+            exchangeFactory,
+            client,
+            owner,
+        };
+    }
+
+    describe("deployExchange", function () {
+      describe("when there is no exchange created for the pair", () => {
+        it("should deploy exchange", async function () {
+          const { exchangeFactory, owner } = await deployFixture();
+          const exchangeDetails = {
+              tokenA: "0x000000000000000000000000000000000042cf0f",
+              tokenB: "0x000000000000000000000000000000000042cf11",
+          }
+
+          const tx = await exchangeFactory.deployExchange(
+              exchangeDetails.tokenA,
+              exchangeDetails.tokenB,
+              { from: owner.address, gasLimit: 3000000 }
+          );
+
+          await expect(tx).to.emit(exchangeFactory, "ExchangeDeployed");
+        });
+      });
+
+      describe("when there is already an exchange created", () => {
+        it("should revert", async function () {
+          const { exchangeFactory, owner } = await deployFixture();
+          const exchangeDetails = {
+              tokenA: "0x000000000000000000000000000000000042cf0f",
+              tokenB: "0x000000000000000000000000000000000042cf11",
+          }
+
+        await exchangeFactory.deployExchange(
+            exchangeDetails.tokenA,
+            exchangeDetails.tokenB,
+            { from: owner.address, gasLimit: 3000000 }
+        )
+
+          await expect(exchangeFactory.deployExchange(
+              exchangeDetails.tokenA,
+              exchangeDetails.tokenB,
+              { from: owner.address, gasLimit: 3000000 }
+          )).to.be.revertedWith('Exchange already deployed');
+        });
+      });
+    });
+});
diff --git a/test/orderbook/exchange-hts.test.ts b/test/orderbook/exchange-hts.test.ts
new file mode 100644
index 0000000..1746f25
--- /dev/null
+++ b/test/orderbook/exchange-hts.test.ts
@@ -0,0 +1,651 @@
+import { ethers } from 'hardhat';
+import { expect } from 'chai';
+import Utils, { Operator } from '../utils';
+import { AccountId, PrivateKey, TokenId, ContractId, Client, ContractFunctionParameters, TransactionRecord } from '@hashgraph/sdk';
+import { AbiCoder } from 'ethers';
+import { bytecode as ExchangeHTSbytecode } from '../../data/abis/ExchangeHTS.json';
+
+const cancelOrder = async (client: Client, operator: Operator, contract: ContractId, orderId: number, isBuy: boolean) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+
+  const functionName = "cancelOrder";
+  const params = new ContractFunctionParameters()
+    .addUint256(orderId.toString())
+    .addBool(isBuy)
+  
+  const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params);
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return {receipt, record};
+}
+
+const depositToken = async (client: Client, operator: Operator, contract: ContractId, tokenId: TokenId | string, amount: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+
+  if (typeof tokenId != 'string') {
+    tokenId = `0x${tokenId.toSolidityAddress()}`;
+  }
+
+  const functionName = "deposit";
+  const params = new ContractFunctionParameters()
+    .addAddress(tokenId)
+    .addInt64(amount.toString());
+  
+    const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params);
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return {receipt, record};
+}
+
+const withdrawToken = async (client: Client, operator: Operator, contract: ContractId, tokenAddress:  string, amount: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "withdraw";
+  const params = new ContractFunctionParameters()
+    .addAddress(tokenAddress)
+    .addInt64(amount.toString());
+  
+    const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params);
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error withdrawing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const placeBuyOrder = async (client: Client, operator: Operator, contract: ContractId, price: number, volume: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "placeBuyOrder";
+  const params = new ContractFunctionParameters()
+    .addInt64(price.toString())
+    .addInt64(volume.toString());
+  
+    const { receipt, record }  = await Utils.executeContract(client, operator, contract, functionName, params);
+    
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const queryBalanceOfExchange = async (client: Client, contract: ContractId, userAddress: string, tokenAddress: string) => {
+  const functionName = "balanceOf";
+  const params = new ContractFunctionParameters()
+      .addAddress(userAddress)
+      .addAddress(tokenAddress);
+
+  // Decode the result
+  const result = await Utils.queryContract(client, contract, functionName, params);
+  const balance = result.getInt64(0); // Adjust based on your function's return type
+  return balance;
+}
+
+const queryCurrentOrderId = async (client: Client, contract: ContractId) => {
+  const functionName = "currentOrderId";
+  const params = new ContractFunctionParameters();
+
+  // Decode the result
+  const result = await Utils.queryContract(client, contract, functionName, params);
+  const balance = result.getUint256(0); // Adjust based on your function's return type
+  return balance;
+}
+
+const queryBuyOrder = async (client: Client, contract: ContractId, orderId: number) => {
+  const functionName = "buyOrders";
+  const params = new ContractFunctionParameters()
+    .addUint256(orderId);
+
+  // Decode the result
+  const result = await Utils.queryContract(client, contract, functionName, params);
+
+  const id = result.getUint256(0);
+  const price = result.getInt64(1);
+  const volume = result.getInt64(2);
+  const trader = `0x${result.getAddress(3)}`;
+  const next = result.getInt64(4);
+
+  return { id, price, volume, trader, next };
+}
+
+const placeSellOrder = async (client: Client, operator: Operator, contract: ContractId, price: number, volume: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "placeSellOrder";
+  const params = new ContractFunctionParameters()
+    .addInt64(price.toString())
+    .addInt64(volume.toString());
+  
+    const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params);
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const eventsEmited = (record: TransactionRecord, eventTopic: string) => {
+  return record.contractFunctionResult?.logs.reduce((acc: Uint8Array[], log) => {
+    for (const topic of log.topics) {
+      const pTopic = `0x${Buffer.from(topic).toString('hex')}`;
+      if (pTopic === eventTopic) {
+        acc.push(log.data);
+      }
+    }
+    return acc;
+  }, [])
+}
+
+async function deployExchangeFixture() {
+  const client = Client.forTestnet();
+      
+  const operatorAccountId = AccountId.fromString(process.env.ACCOUNT_ID as string);
+  const operatorPrivateKey = PrivateKey.fromStringECDSA(process.env.PRIVATE_KEY as string);
+  
+  const aliceAccountId = AccountId.fromString(process.env.ALICE_ACCOUNT_ID as string);
+  const alicePrivateKey = PrivateKey.fromStringED25519(process.env.ALICE_KEY as string);
+  
+  const bobAccountId = AccountId.fromString(process.env.BOB_ACCOUNT_ID as string);
+  const bobPrivateKey = PrivateKey.fromStringECDSA(process.env.BOB_KEY as string);
+  
+  const charlieAccountId = AccountId.fromString(process.env.CHARLIE_ACCOUNT_ID as string);
+  const charliePrivateKey = PrivateKey.fromStringECDSA(process.env.CHARLIE_KEY as string);
+  
+  const davidAccountId = AccountId.fromString(process.env.DAVID_ACCOUNT_ID as string);
+  const davidPrivateKey = PrivateKey.fromStringED25519(process.env.DAVID_KEY as string);
+
+  const operator = {
+    accountId: operatorAccountId,
+    key: operatorPrivateKey,
+    address: '0x' + operatorAccountId.toSolidityAddress(),
+  }
+
+  const alice = {
+    accountId: aliceAccountId,
+    key: alicePrivateKey,
+    address: '0x' + aliceAccountId.toSolidityAddress(),
+  }
+
+  const bob = {
+    accountId: bobAccountId,
+    key: bobPrivateKey,
+    address: '0x' + bobAccountId.toSolidityAddress()
+  }
+
+  const charlie = {
+    accountId: charlieAccountId,
+    key: charliePrivateKey,
+    address: '0x' + charlieAccountId.toSolidityAddress()
+  }
+
+  const david = {
+    accountId: davidAccountId,
+    key: davidPrivateKey,
+    address: '0x' + davidAccountId.toSolidityAddress()
+  }
+
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+
+  // const idTokenA = TokenId.fromString('0.0.4378383');
+  // const idTokenB = TokenId.fromString('0.0.4378385');
+  // const exchangeId = ContractId.fromString("0.0.4397364");
+  const idTokenA = await Utils.createFungibleToken(client, operator.accountId, operator.key, 'Test Token A', 'TOKEN_A');
+  const idTokenB = await Utils.createFungibleToken(client, operator.accountId, operator.key, 'Test Token B', 'TOKEN_B');
+  const exchangeId = await Utils.deployContract(
+    client, 
+    operator, 
+    ExchangeHTSbytecode, 
+    ['0x' + idTokenA.toSolidityAddress(), '0x' + idTokenB.toSolidityAddress()]
+  );
+
+  console.log(`deployed exchange at ${exchangeId} or ${exchangeId.toSolidityAddress()}`)
+
+  const toTokenA = (_number: number) => {
+    return _number * 10 ** 8;
+  }
+
+  const toTokenB = (_number: number) => {
+    return _number * 10 ** 8;
+  }
+
+  const minting = [
+    Utils.tokenMint(client, operator, idTokenA, toTokenA(1_000_000 * 4)),
+    Utils.tokenMint(client, operator, idTokenB, toTokenB(1_000_000 * 4)),
+  ];
+  
+  await Promise.all(minting);    
+
+  const associations = [
+    // token A
+    Utils.associateTokenToAccount(client, idTokenA, alice),
+    Utils.associateTokenToAccount(client, idTokenA, bob),
+    Utils.associateTokenToAccount(client, idTokenA, charlie),
+    Utils.associateTokenToAccount(client, idTokenA, david),
+    // token B
+    Utils.associateTokenToAccount(client, idTokenB, alice),
+    Utils.associateTokenToAccount(client, idTokenB, bob),
+    Utils.associateTokenToAccount(client, idTokenB, charlie),
+    Utils.associateTokenToAccount(client, idTokenB, david),
+  ];
+
+  await Promise.all(associations);    
+
+  const transfers = [
+    // token A
+    Utils.transferToken(client, idTokenA, operator, alice.accountId, toTokenA(1_000_000)),
+    Utils.transferToken(client, idTokenA, operator, bob.accountId, toTokenA(1_000_000)),
+    Utils.transferToken(client, idTokenA, operator, charlie.accountId, toTokenA(1_000_000)),
+    Utils.transferToken(client, idTokenA, operator, david.accountId, toTokenA(1_000_000)),
+    // // token B
+    Utils.transferToken(client, idTokenB, operator, alice.accountId, toTokenB(1_000_000)),
+    Utils.transferToken(client, idTokenB, operator, bob.accountId, toTokenB(1_000_000)),
+    Utils.transferToken(client, idTokenB, operator, charlie.accountId, toTokenB(1_000_000)),
+    Utils.transferToken(client, idTokenB, operator, david.accountId, toTokenB(1_000_000)),
+    // token A
+    Utils.approveToken(client, idTokenA, alice, exchangeId, toTokenA(1_000_000)),
+    Utils.approveToken(client, idTokenA, bob, exchangeId, toTokenA(1_000_000)),
+    Utils.approveToken(client, idTokenA, charlie, exchangeId, toTokenA(1_000_000)),
+    Utils.approveToken(client, idTokenA, david, exchangeId, toTokenA(1_000_000)),
+    // token B
+    Utils.approveToken(client, idTokenB, alice, exchangeId, toTokenB(1_000_000)),
+    Utils.approveToken(client, idTokenB, bob, exchangeId, toTokenB(1_000_000)),
+    Utils.approveToken(client, idTokenB, charlie, exchangeId, toTokenB(1_000_000)),
+    Utils.approveToken(client, idTokenB, david, exchangeId, toTokenB(1_000_000)),
+  ];
+
+  await Promise.all(transfers);    
+
+  return {
+    client,
+    operator,
+    alice,
+    bob,
+    charlie,
+    david,
+    exchangeId,
+    idTokenA,
+    idTokenB,
+    toTokenA,
+    toTokenB,
+  }
+}
+
+describe('Exchange HTS', () => {
+  describe('Exchange', () => {
+    describe('.lastOrderId', () => {
+      describe('when buy or sell order is placed', () => {
+        it("should increment by 1", async function() {
+          const { client, alice, exchangeId, idTokenB, toTokenA, toTokenB } = await deployExchangeFixture();
+          await depositToken(client, alice, exchangeId, idTokenB, toTokenB(400));
+          const currentId = await queryCurrentOrderId(client, exchangeId);
+          
+          const orders = [ 
+            placeBuyOrder(client, alice, exchangeId, toTokenB(100), toTokenA(1)),
+            placeBuyOrder(client, alice, exchangeId, toTokenB(100), toTokenA(1)),
+            placeBuyOrder(client, alice, exchangeId, toTokenB(100), toTokenA(1)),
+            placeBuyOrder(client, alice, exchangeId, toTokenB(100), toTokenA(1)),
+          ]
+          
+          await Promise.all(orders);
+
+          expect(await queryCurrentOrderId(client, exchangeId)).to.equal(currentId.plus(4));
+        });
+      });
+    });
+
+    describe('.placeBuyOrder', () => {
+      describe('when there is not matching sell order', () => {
+        it('should place buy order', async () => {
+          const { client, alice, exchangeId, idTokenB, toTokenB, toTokenA } = await deployExchangeFixture();
+          await depositToken(client, alice, exchangeId, idTokenB, toTokenB(1000));
+          await placeBuyOrder(client, alice, exchangeId, toTokenB(200), toTokenA(5));
+          const currentId = await queryCurrentOrderId(client, exchangeId);
+          const order = await queryBuyOrder(client, exchangeId, currentId.toNumber());
+  
+          expect(order.id).to.equal(currentId.toNumber());
+          expect(order.price).to.equal(toTokenB(200));
+          expect(order.volume).to.equal(toTokenA(5));
+          expect(order.trader).to.equal(alice.address);
+        });
+      });
+  
+      describe('when there is matching sell order', () => {
+        describe('when is whole fulfillment', () => {
+          it('should trade one to one', async () => {
+            const { client, alice, bob, exchangeId, idTokenB, idTokenA, toTokenA, toTokenB } = await deployExchangeFixture();
+            
+            await Promise.all([
+              depositToken(client, alice, exchangeId, idTokenA, toTokenA(1)),
+              depositToken(client, bob, exchangeId, idTokenB, toTokenB(1000)),
+            ]);
+
+            await placeSellOrder(client, alice, exchangeId, toTokenB(765), toTokenA(1));
+            const { record } = await placeBuyOrder(client, bob, exchangeId, toTokenB(765), toTokenB(1));   
+
+            const tradeEvent = eventsEmited(record, ethers.id("Trade(int64,int64,address,address)")) as Uint8Array [];
+
+            expect(tradeEvent.length).to.be.equal(1);
+  
+            const parsedLog = AbiCoder.defaultAbiCoder().decode(
+              ["int64", "int64", "address"],
+              tradeEvent[0]
+            );
+            
+            expect(parsedLog.length).to.equal(3);
+            expect(parsedLog[0]).to.equal(BigInt(toTokenA(1)));
+            expect(parsedLog[1]).to.equal(BigInt(toTokenB(765)));
+            // expect(parsedLog[2].toLowerCase()).to.equal(alice.address);
+
+          });
+  
+          it('should trade many to one', async () => {          
+            const { client, alice, bob, charlie, david, exchangeId, idTokenB, idTokenA, toTokenA, toTokenB } = await deployExchangeFixture();
+
+            await Promise.all([
+              depositToken(client, alice, exchangeId, idTokenA, toTokenA(1)),
+              depositToken(client, bob, exchangeId, idTokenA, toTokenA(1)),
+              depositToken(client, charlie, exchangeId, idTokenA, toTokenA(1)),
+              depositToken(client, david, exchangeId, idTokenB, toTokenB(2295)),
+            ]); 
+
+
+            await placeSellOrder(client, alice, exchangeId, toTokenB(765), toTokenA(1));
+            await placeSellOrder(client, bob, exchangeId, toTokenB(765), toTokenA(1));
+            await placeSellOrder(client, charlie, exchangeId, toTokenB(765), toTokenA(1));
+
+            const { record } = await placeBuyOrder(client, david, exchangeId, toTokenB(765), toTokenA(3));   
+
+            const tradeEvent = eventsEmited(record, ethers.id("Trade(int64,int64,address,address)")) as Uint8Array [];
+
+            expect(tradeEvent.length).to.be.equal(3);
+            
+            const parsedLog1 = AbiCoder.defaultAbiCoder().decode(
+              ["int64", "int64", "address"],
+              tradeEvent[0]
+            );
+            
+            expect(parsedLog1.length).to.equal(3);
+            expect(parsedLog1[0]).to.equal(BigInt(toTokenA(1)));
+            expect(parsedLog1[1]).to.equal(BigInt(toTokenB(765)));
+            // expect(parsedLog1[2].toLowerCase()).to.equal(alice.address);
+
+            const parsedLog2 = AbiCoder.defaultAbiCoder().decode(
+              ["int64", "int64", "address"],
+              tradeEvent[1]
+            );
+            
+            expect(parsedLog2.length).to.equal(3);
+            expect(parsedLog2[0]).to.equal(BigInt(toTokenA(1)));
+            expect(parsedLog2[1]).to.equal(BigInt(toTokenB(765)));
+            // expect(parsedLog2[2].toLowerCase()).to.equal(bob.address);
+
+            const parsedLog3 = AbiCoder.defaultAbiCoder().decode(
+              ["int64", "int64", "address"],
+              tradeEvent[2]
+            );
+            
+            expect(parsedLog3.length).to.equal(3);
+            expect(parsedLog3[0]).to.equal(BigInt(toTokenA(1)));
+            expect(parsedLog3[1]).to.equal(BigInt(toTokenB(765)));
+            // expect(parsedLog3[2].toLowerCase()).to.equal(charlie.address);
+  
+          });
+        });
+  
+        describe('when is partial fulfillment', () => {
+          it('should trade and insert remainder volume', async () => {
+            const { client, alice, bob, exchangeId, idTokenB, idTokenA, toTokenA, toTokenB } = await deployExchangeFixture();
+            
+            await Promise.all([
+              depositToken(client, alice, exchangeId, idTokenA, toTokenA(2)),
+              depositToken(client, bob, exchangeId, idTokenB, toTokenB(1590)),
+            ]);
+
+            await placeSellOrder(client, alice, exchangeId, toTokenB(795), toTokenA(1)); // sell only one
+            const { record } = await placeBuyOrder(client, bob, exchangeId, toTokenB(795), toTokenA(2));   
+
+            const tradeEvent = eventsEmited(record, ethers.id("Trade(int64,int64,address,address)")) as Uint8Array [];
+            const newOrderEvent = eventsEmited(record, ethers.id("NewOrder(bool,uint256,address,int64,int64)")) as Uint8Array [];
+
+            expect(tradeEvent.length).to.be.equal(1, "trade lengh error");
+            expect(newOrderEvent.length).to.be.equal(1, "new order lengh error");
+  
+            const parsedLogTrade = AbiCoder.defaultAbiCoder().decode(
+              ["int64", "int64", "address"],
+              tradeEvent[0]
+            );
+            
+            expect(parsedLogTrade.length).to.equal(3);
+            expect(parsedLogTrade[0]).to.equal(BigInt(toTokenA(1)));
+            expect(parsedLogTrade[1]).to.equal(BigInt(toTokenB(795)));
+            // expect(parsedLogTrade[2].toLowerCase()).to.equal(alice.address);
+
+            const parsedLogNewOrder = AbiCoder.defaultAbiCoder().decode(
+              ["bool","uint256","address","int64","int64"],
+              newOrderEvent[0]
+            );
+
+            expect(parsedLogNewOrder.length).to.equal(5);
+            expect(parsedLogNewOrder[0]).to.equal(true);
+            // expect(parsedLogNewOrder[1]).to.equal(765n);
+            // expect(parsedLogNewOrder[2]).to.equal(765n);
+            expect(parsedLogNewOrder[3]).to.equal(BigInt(toTokenB(795)));
+            expect(parsedLogNewOrder[4]).to.equal(BigInt(toTokenB(1)));
+  
+          });
+        });
+      });
+    });
+
+    describe('.withdraw', () => {
+      describe('when token is invalid', () => {
+        it('should revert', async () => {
+          const { client, exchangeId, alice } = await deployExchangeFixture();
+          try {
+            await withdrawToken(client, alice, exchangeId, ethers.ZeroAddress, 100)
+            expect.fail("withdraw should have reverted but it did not.");
+          } catch (error: any) {
+            expect(error.message).to.exist;
+          }
+        });
+      });
+  
+      describe('when amount is invalid', () => {
+        it('should revert', async () => {
+          const { exchangeId, client, alice, idTokenA, toTokenA } = await deployExchangeFixture();
+  
+          await depositToken(client, alice, exchangeId, idTokenA, toTokenA(100));
+          try {
+            await withdrawToken(client, alice, exchangeId, alice.address, 0);
+            expect.fail("withdraw should have reverted but it did not.");
+          } catch (error: any) {
+            expect(error.message).to.exist;
+          }
+        });
+      });
+  
+      describe('when trader has not enough balance', () => {
+        it('should revert', async () => {
+          const { exchangeId, client, alice, idTokenA, toTokenA } = await deployExchangeFixture();
+  
+          await depositToken(client, alice, exchangeId, idTokenA, toTokenA(100));
+          try {
+            await withdrawToken(client, alice, exchangeId, alice.address, toTokenA(101));
+            expect.fail("withdraw should have reverted but it did not.");
+          } catch (error: any) {
+            expect(error.message).to.exist;
+          }
+        });
+      });
+  
+      describe('when trader does not cancel a buy order', () => {
+        it('it should revert', async () => {
+          const { exchangeId, client, alice, idTokenB, toTokenB, toTokenA } = await deployExchangeFixture();
+  
+          await depositToken(client, alice, exchangeId, idTokenB, toTokenB(100));
+          await placeBuyOrder(client, alice, exchangeId, toTokenB(100), toTokenA(1));
+
+          try {
+            await withdrawToken(client, alice, exchangeId, alice.address, toTokenB(100));
+            expect.fail("withdraw should have reverted but it did not.");
+          } catch (error: any) {
+            expect(error.message).to.exist;
+          }   
+        });
+      });
+  
+      describe('when trader has balance', () => {
+        it('it should withdraw', async () => {
+          const { exchangeId, client, alice, idTokenB, toTokenB } = await deployExchangeFixture();
+          const addressTokenB = '0x' + idTokenB.toSolidityAddress();
+          await depositToken(client, alice, exchangeId, idTokenB, toTokenB(100));
+          
+          const { record } = await withdrawToken(client, alice, exchangeId, addressTokenB, toTokenB(100));
+
+          const withdrawEvent = eventsEmited(record, ethers.id("Withdraw(address,address,int64)")) as Uint8Array [];
+
+          expect(withdrawEvent.length).to.be.equal(1, "withdraw lengh error");
+  
+          const parsedLogWithdraw = AbiCoder.defaultAbiCoder().decode(
+            ["address", "address", "int64"],
+            withdrawEvent[0]
+          );
+          
+          expect(parsedLogWithdraw.length).to.be.equal(3);
+          expect(parsedLogWithdraw[0].toLowerCase()).to.be.equal(alice.address);
+          expect(parsedLogWithdraw[1].toLowerCase()).to.be.equal(addressTokenB);
+          expect(parsedLogWithdraw[2]).to.be.equal(toTokenB(100));
+        });
+      });
+    });
+
+    describe('.deposit', () => {
+      describe('when amount is invalid', () => {
+        it('should revert', async () => {
+          const { client, exchangeId, alice, idTokenA } = await deployExchangeFixture();
+          try {
+            await depositToken(client, alice, exchangeId, idTokenA, 0)
+            expect.fail("withdraw should have reverted but it did not.");
+          } catch (error: any) {
+            expect(error.message).to.exist;
+          }
+        });
+      });
+  
+      describe('when token is invalid', () => {
+        it('should revert', async () => {
+          it('should revert', async () => {
+            const { client, exchangeId, alice, idTokenA, toTokenA } = await deployExchangeFixture();
+            try {
+              await depositToken(client, alice, exchangeId, ethers.ZeroAddress, toTokenA(100))
+              expect.fail("withdraw should have reverted but it did not.");
+            } catch (error: any) {
+              expect(error.message).to.exist;
+            }
+          });
+        });
+      });
+    });
+
+    describe('.cancelOrder', () => {    
+      describe('when order dont exists', () => {
+        it('should revert', async () => {
+          const { client, exchangeId, alice, idTokenA } = await deployExchangeFixture();
+          
+          const orderId = 0;
+
+          try {
+            await cancelOrder(client, alice, exchangeId, orderId, true);
+            expect.fail("withdraw should have reverted but it did not.");
+          } catch (error: any) {
+            expect(error.message).to.exist;
+          }
+        });
+      });
+  
+      describe('when order exists', () => {
+        describe('when is Order', () => {
+          describe('when caller is not the order owner', () => {
+            it('should revert', async () => {
+              const { client, exchangeId, alice, bob, idTokenA, toTokenA, toTokenB } = await deployExchangeFixture();
+
+              await depositToken(client, alice, exchangeId, idTokenA, toTokenA(1));
+              await placeSellOrder(client, alice, exchangeId, toTokenB(1), toTokenA(1));
+              const orderId = await queryCurrentOrderId(client, exchangeId);
+
+              try {
+                await cancelOrder(client, bob, exchangeId, orderId.toNumber(), false);
+                expect.fail("withdraw should have reverted but it did not.");
+              } catch (error: any) {
+                expect(error.message).to.exist;
+              }
+            });
+          });
+          describe('when order is fulfilled', () => {
+            it('should revert', async () => {
+              const { client, exchangeId, alice, bob, idTokenA, idTokenB, toTokenA, toTokenB } = await deployExchangeFixture();
+
+              await depositToken(client, alice, exchangeId, idTokenA, toTokenA(1));
+              await depositToken(client, bob, exchangeId, idTokenB, toTokenA(10));
+              await placeSellOrder(client, alice, exchangeId, toTokenB(10), toTokenA(1));
+              const orderId = await queryCurrentOrderId(client, exchangeId);
+              await placeBuyOrder(client, bob, exchangeId, toTokenB(10), toTokenA(1));
+
+              try {
+                await cancelOrder(client, bob, exchangeId, orderId.toNumber(), false);
+                expect.fail("withdraw should have reverted but it did not.");
+              } catch (error: any) {
+                expect(error.message).to.exist;
+              }
+            });
+          });
+    
+          describe('when caller is the orders owner', () => {
+            it('should cancel order and refund balance', async () => {
+              const { client, exchangeId, alice, idTokenA, toTokenA, toTokenB } = await deployExchangeFixture();
+
+              const addressTokenA = `0x${idTokenA.toSolidityAddress()}`;
+              await depositToken(client, alice, exchangeId, idTokenA, toTokenA(207));
+              const balance1 = await queryBalanceOfExchange(client, exchangeId, alice.address, addressTokenA);
+              await placeSellOrder(client, alice, exchangeId, toTokenB(10), toTokenA(207));              
+              const balance2 = await queryBalanceOfExchange(client, exchangeId, alice.address, addressTokenA);
+              const orderId = await queryCurrentOrderId(client, exchangeId);         
+
+              await cancelOrder(client, alice, exchangeId, orderId.toNumber(), false);
+              const balance3 = await queryBalanceOfExchange(client, exchangeId, alice.address, addressTokenA);
+
+              expect(balance2).to.be.equal(balance1.minus(toTokenA(207)));
+              expect(balance3).to.be.equal(balance1);
+    
+            });
+          });
+        });
+      });
+    });
+  });
+});
+
diff --git a/test/orderbook/exchange.test.ts b/test/orderbook/exchange.test.ts
new file mode 100644
index 0000000..ef9c699
--- /dev/null
+++ b/test/orderbook/exchange.test.ts
@@ -0,0 +1,576 @@
+import { loadFixture } from '@nomicfoundation/hardhat-network-helpers';
+import { expect } from 'chai';
+import { BigNumberish } from 'ethers';
+import { ethers } from 'hardhat';
+
+async function deployExchangeFixture() {
+  const [owner, alice, bob, charlie, david] = await ethers.getSigners();
+
+  // Deploy Mock ERC20 tokens for tokenA and tokenB
+  const Token = await ethers.getContractFactory("TestERC20");
+  const tokenB = await Token.deploy("Token B", "TKB");
+  const tokenA = await Token.deploy("Token A", "TKA");
+  
+  const addressTokenA = await tokenA.getAddress();
+  const addressTokenB = await tokenB.getAddress();
+
+  const exchange = await ethers.deployContract('Exchange', [tokenA, tokenB], owner);
+  await exchange.waitForDeployment();
+
+  const decimalsTokenA = await tokenA.decimals();
+  const decimalsTokenB = await tokenB.decimals();
+
+  const toTokenA = (_number: bigint) => {
+    return _number * 10n ** decimalsTokenA;
+  }
+
+  const toTokenB = (_number: bigint) => {
+    return _number * 10n ** decimalsTokenB;
+  }
+
+  // Token A config
+  await tokenA.mint(alice.address, toTokenA(10000000000n) );
+  await tokenA.mint(bob.address, toTokenA(10000000000n));
+  await tokenA.mint(charlie.address, toTokenA(10000000000n));
+  await tokenA.mint(david.address, toTokenA(10000000000n));
+
+  await tokenA.connect(alice).approve(await exchange.getAddress(), toTokenA(10000000000n));
+  await tokenA.connect(bob).approve(await exchange.getAddress(), toTokenA(10000000000n));
+  await tokenA.connect(charlie).approve(await exchange.getAddress(), toTokenA(10000000000n));
+  await tokenA.connect(david).approve(await exchange.getAddress(), toTokenA(10000000000n));
+
+  // Token B config
+  await tokenB.mint(alice.address, toTokenB(10000000000n));
+  await tokenB.mint(bob.address, toTokenB(10000000000n));
+  await tokenB.mint(charlie.address, toTokenB(10000000000n));
+  await tokenB.mint(david.address, toTokenB(10000000000n));
+
+  await tokenB.connect(alice).approve(await exchange.getAddress(), toTokenB(10000000000n));
+  await tokenB.connect(bob).approve(await exchange.getAddress(), toTokenB(10000000000n));
+  await tokenB.connect(charlie).approve(await exchange.getAddress(), toTokenB(10000000000n));
+  await tokenB.connect(david).approve(await exchange.getAddress(), toTokenB(10000000000n));
+
+  return {
+    owner,
+    alice,
+    bob,
+    charlie,
+    david,
+    exchange,
+    tokenA,
+    addressTokenA,
+    toTokenA,
+    tokenB,
+    addressTokenB,
+    toTokenB,
+  }
+}
+
+describe('Exchange', () => {
+
+  describe('.lastOrderId', () => {
+    describe('when buy or sell order is placed', () => {
+      it("should increment by 1", async function() {
+        const { exchange, alice, bob, charlie, david, tokenB, tokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+  
+        await exchange.connect(alice).deposit(tokenB, toTokenB(750n));
+        await exchange.connect(alice).placeBuyOrder(toTokenB(150n), toTokenA(5n));
+        expect(await exchange.currentOrderId()).to.equal(1);
+
+        await exchange.connect(bob).deposit(tokenB, toTokenB(750n));
+        await exchange.connect(bob).placeBuyOrder(toTokenB(150n), toTokenA(5n));
+        expect(await exchange.currentOrderId()).to.equal(2);
+
+        await exchange.connect(charlie).deposit(tokenB, toTokenB(750n));
+        await exchange.connect(charlie).placeBuyOrder(toTokenB(150n), toTokenA(5n));
+        expect(await exchange.currentOrderId()).to.equal(3);
+
+        await exchange.connect(david).deposit(tokenA, toTokenA(5n));
+        await exchange.connect(david).placeSellOrder(toTokenB(150n), toTokenA(5n));
+        expect(await exchange.currentOrderId()).to.equal(3); // matched orders does not increment id
+
+        await exchange.connect(david).deposit(tokenA, toTokenA(750n));
+        await exchange.connect(david).placeBuyOrder(toTokenB(150n), toTokenA(5n));
+        expect(await exchange.currentOrderId()).to.equal(4); // matched orders does not increment id
+
+      });
+    });
+  });
+
+  describe('.placeBuyOrder', () => {
+    describe('when there is not matching sell order', () => {
+      it('should place buy order', async () => {
+        const { exchange, alice, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+        
+        await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n)); // price, volume
+        await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(10n)); // price, volume
+        const order = await exchange.buyOrders(1); // Accessing the first order
+
+        expect(order.price).to.equal(toTokenB(100n));
+        expect(order.volume).to.equal(toTokenA(10n));
+        expect(order.trader).to.equal(alice.address);
+        expect(order.next).to.equal(0); // No next order
+      });
+
+      it("should place buy orders sorted by highest price", async function () {
+        const { exchange, alice, bob, charlie, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+  
+        await exchange.connect(alice).deposit(addressTokenB, toTokenB(600n));
+        await exchange.connect(bob).deposit(addressTokenB, toTokenB(750n));
+        await exchange.connect(charlie).deposit(addressTokenB, toTokenB(4600n));
+
+        await exchange.connect(alice).placeBuyOrder(toTokenB(200n), toTokenA(3n));
+        await exchange.connect(bob).placeBuyOrder(toTokenB(150n), toTokenA(5n));
+        await exchange.connect(charlie).placeBuyOrder(toTokenB(110n), toTokenA(10n));
+        await exchange.connect(charlie).placeBuyOrder(toTokenB(100n), toTokenA(10n));
+  
+        const firstOrder = await exchange.buyOrders(1); // The order with the highest price
+        const secondOrder = await exchange.buyOrders(2);
+        const thirdOrder = await exchange.buyOrders(3);
+        const fourthOrder = await exchange.buyOrders(4);
+  
+        expect(firstOrder.price).to.equal(toTokenB(200n));
+        expect(secondOrder.price).to.equal(toTokenB(150n));
+        expect(thirdOrder.price).to.equal(toTokenB(110n));
+        expect(fourthOrder.price).to.equal(toTokenB(100n));
+  
+        expect(firstOrder.next).to.equal(2); // Points to second highest price
+        expect(secondOrder.next).to.equal(3);
+        expect(thirdOrder.next).to.equal(4); 
+        expect(fourthOrder.next).to.equal(0); 
+
+        // check if firstBuyOrderId is set correctly to the bid with the hihgest price
+        expect(await exchange.firstBuyOrderId()).to.equal(1);
+
+        await exchange.connect(charlie).placeBuyOrder(toTokenB(250n), toTokenA(10n));
+        const fifthOrder_2 = await exchange.buyOrders(5);
+
+        expect(await exchange.firstBuyOrderId()).to.equal(5); 
+        expect(fifthOrder_2.next).to.equal(1); 
+      });
+    });
+
+    describe('when there is matching sell order', () => {
+      describe('when is whole fulfillment', () => {
+        it('should trade one to one', async () => {
+          const { exchange, alice, bob, addressTokenB, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+        
+          await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+          await exchange.connect(bob).deposit(addressTokenB, toTokenB(1000n));
+
+          await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n)); // price, volume
+          const trade = await exchange.connect(bob).placeBuyOrder(toTokenB(100n), toTokenA(10n)); // price, volume
+
+          await expect(trade).to.emit(exchange, 'Trade').withArgs(toTokenA(10n), toTokenB(100n), bob.address, alice.address);          
+
+        });
+
+        it('should trade many to one', async () => {
+          const { exchange, alice, bob, charlie, david, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+          
+          await exchange.connect(alice).deposit(addressTokenA, toTokenA(3n));
+          await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(3n)); // price, volume
+
+          await exchange.connect(bob).deposit(addressTokenA, toTokenA(6n));
+          await exchange.connect(bob).placeSellOrder(toTokenB(100n), toTokenA(6n)); // price, volume
+
+          await exchange.connect(charlie).deposit(addressTokenA, toTokenA(1n));
+          await exchange.connect(charlie).placeSellOrder(toTokenB(100n), toTokenA(1n)); // price, volume
+          const firstBuyOrderIdBefore = await exchange.firstBuyOrderId();
+          
+          await exchange.connect(david).deposit(addressTokenB, toTokenB(1000n));
+          const trade = await exchange.connect(david).placeBuyOrder(toTokenB(100n), toTokenA(10n)); // price, volume
+          await trade.wait();
+
+          const firstBuyOrderIdAfter = await exchange.firstBuyOrderId();
+          expect(firstBuyOrderIdBefore).to.equal(firstBuyOrderIdAfter); // should not insert buy order to storage
+
+          const events = (await exchange.queryFilter(exchange.filters.Trade, -1));
+          expect(events.length).to.equal(3);
+
+          await expect(trade)
+            .to.emit(exchange, 'Trade').withArgs(toTokenA(3n), toTokenB(100n), david.address, alice.address)
+            .to.emit(exchange, 'Trade').withArgs(toTokenA(6n), toTokenB(100n), david.address, bob.address)
+            .to.emit(exchange, 'Trade').withArgs(toTokenA(1n), toTokenB(100n), david.address, charlie.address)
+
+        });
+      });
+
+      describe('when is partial fulfillment', () => {
+        it('should trade and insert remainder volume', async () => {
+          const { exchange, alice, bob, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+          
+          await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+          const tx = await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n)); // price, volume
+          await tx.wait();
+
+          await exchange.connect(bob).deposit(addressTokenB, toTokenB(1500n));
+          const trade = await exchange.connect(bob).placeBuyOrder(toTokenB(100n), toTokenA(15n)); // price, volume
+          await trade.wait();
+
+          const events1 = (await exchange.queryFilter(exchange.filters.Trade, -1));
+          expect(events1.length).to.equal(1);
+
+          const events2 = (await exchange.queryFilter(exchange.filters.NewOrder, -2));
+          expect(events2.length).to.equal(2);
+
+          await expect(trade)
+            .to.emit(exchange, 'Trade').withArgs(toTokenA(10n), toTokenB(100n), bob.address, alice.address)
+            .to.emit(exchange, 'NewOrder').withArgs(true, 2, bob.address, toTokenB(100n), toTokenA(5n));
+
+        });
+      });
+    });
+  });
+
+  describe('.placeSellOrder', () => {
+    describe('when trying to place sell order', () => {
+      it('should succeed', async () => {
+        const { exchange, alice, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+        
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n)); // price, volume
+        await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n)); // price, volume
+        const order = await exchange.sellOrders(1); // Accessing the first order
+
+        expect(order.price).to.equal(toTokenB(100n));
+        expect(order.volume).to.equal(toTokenA(10n));
+        expect(order.trader).to.equal(alice.address);
+        expect(order.next).to.equal(0); // No next order
+      });
+
+      it("should insert sell orders sorted by lowest price", async function () {
+        const { exchange, alice, bob, charlie, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+  
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(5n));
+        await exchange.connect(alice).placeSellOrder(toTokenB(150n), toTokenA(5n));
+        
+        await exchange.connect(bob).deposit(addressTokenA, toTokenA(3n));
+        await exchange.connect(bob).placeSellOrder(toTokenB(200n), toTokenA(3n));
+
+        await exchange.connect(charlie).deposit(addressTokenA, toTokenA(20n));
+        await exchange.connect(charlie).placeSellOrder(toTokenB(100n), toTokenA(10n));
+  
+        const firstOrder = await exchange.sellOrders(3); // The order with the highest price
+        const secondOrder = await exchange.sellOrders(1);
+        const thirdOrder = await exchange.sellOrders(2);
+  
+        expect(firstOrder.price).to.equal(toTokenB(100n));
+        expect(secondOrder.price).to.equal(toTokenB(150n));
+        expect(thirdOrder.price).to.equal(toTokenB(200n));
+  
+        expect(firstOrder.next).to.equal(1); // Points to second highest price
+        expect(secondOrder.next).to.equal(2); // Points to lowest price
+        expect(thirdOrder.next).to.equal(0); // No next order
+
+        // check if firstBuyOrderId is set correctly to the bid with the hihgest price
+        expect(await exchange.firstSellOrderId()).to.equal(3);
+
+        await exchange.connect(charlie).placeSellOrder(toTokenB(90n), toTokenA(10n));
+
+        expect(await exchange.firstSellOrderId()).to.equal(4);
+      });
+    });
+  });
+
+  describe('.balanceOf', () => {
+    describe('when a buy order is placed', () => {
+      it('should not increase balanceOf token B', async () => {
+        const { exchange, alice, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+        
+        await exchange.connect(alice).deposit(addressTokenB, toTokenB(13200n)); // price, volume
+        await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(132n)); // price, volume
+
+        expect(await exchange.balanceOf(alice.address, await exchange.tokenB())).to.be.equal(0);
+      });
+
+      it('should increase only remainder balance', async () => {
+        const { exchange, alice, addressTokenB, toTokenA, toTokenB  } = await loadFixture(deployExchangeFixture);
+        
+        await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n));
+        await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(5n)); // price, volume
+
+        expect(await exchange.balanceOf(alice.address, await exchange.tokenB())).to.be.equal(toTokenB(500n));
+      });
+    });
+
+    describe('when a sell order is placed', () => {
+      it('should not increase balanceOf token A', async () => {
+        const { exchange, alice, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+        
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(132n));
+        await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(132n)); // price, volume
+
+        expect(await exchange.balanceOf(alice.address, await exchange.tokenA())).to.be.equal(0);
+      });
+
+      it('should only increade remainder balance', async () => {
+        const { exchange, alice, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+        
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(100n));
+        await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(50n)); // price, volume
+
+        expect(await exchange.balanceOf(alice.address, await exchange.tokenA())).to.be.equal(toTokenA(50n));
+      });
+      
+    });
+
+    describe('when a trade happens', () => {
+      describe('when the price is the same', () => {
+        it('should trade', async () => {
+          const { exchange, alice, bob, charlie, david, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+          
+          await exchange.connect(alice).deposit(addressTokenA, toTokenA(100n));
+          await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(100n)); // price, volume
+
+          await exchange.connect(bob).deposit(addressTokenA, toTokenA(30n));
+          await exchange.connect(bob).placeSellOrder(toTokenB(100n), toTokenA(30n)); // price, volume
+
+          await exchange.connect(charlie).deposit(addressTokenA, toTokenA(20n));
+          await exchange.connect(charlie).placeSellOrder(toTokenB(100n), toTokenA(20n)); // price, volume
+
+          await exchange.connect(david).deposit(addressTokenB, toTokenB(20000n));
+          await exchange.connect(david).placeBuyOrder(toTokenB(100n), toTokenA(200n)); // price, volume
+
+          expect(await exchange.balanceOf(alice.address, await exchange.tokenA())).to.be.equal(0);
+          expect(await exchange.balanceOf(bob.address, await exchange.tokenA())).to.be.equal(0);
+          expect(await exchange.balanceOf(charlie.address, await exchange.tokenA())).to.be.equal(0);
+          expect(await exchange.balanceOf(david.address, await exchange.tokenA())).to.be.equal(toTokenA(150n));
+          expect(await exchange.balanceOf(david.address, await exchange.tokenB())).to.be.equal(0);
+        });
+      });
+      describe('when the price is different', () => {
+        it('should trade with Market Price Priority', async () => {
+          const { exchange, alice, bob, charlie, david, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+          
+          await exchange.connect(alice).deposit(addressTokenA, toTokenA(100n));
+          await exchange.connect(alice).placeSellOrder(toTokenB(99n), toTokenA(100n)); // price, volume
+
+          await exchange.connect(bob).deposit(addressTokenA, toTokenA(30n));
+          await exchange.connect(bob).placeSellOrder(toTokenB(100n), toTokenA(30n)); // price, volume
+
+          await exchange.connect(charlie).deposit(addressTokenA, toTokenA(20n));
+          await exchange.connect(charlie).placeSellOrder(toTokenB(100n), toTokenA(20n)); // price, volume
+
+          await exchange.connect(david).deposit(addressTokenB, toTokenB(20000n));
+          await exchange.connect(david).placeBuyOrder(toTokenB(100n), toTokenA(200n)); // price, volume
+
+          expect(await exchange.balanceOf(alice.address, await exchange.tokenA())).to.be.equal(0);
+          expect(await exchange.balanceOf(bob.address, await exchange.tokenA())).to.be.equal(0);
+          expect(await exchange.balanceOf(charlie.address, await exchange.tokenA())).to.be.equal(0);
+          expect(await exchange.balanceOf(david.address, await exchange.tokenA())).to.be.equal(toTokenA(150n));
+
+          const deposited = toTokenB(20000n); // tokenB
+          const traded = (toTokenB(100n * 20n)) + (toTokenB(100n *30n)) + (toTokenB(99n * 100n)); // tokenB
+          const remainderCreated = toTokenB(100n * 50n); // tokenB
+
+          expect(await exchange.balanceOf(david.address, await exchange.tokenB())).to.be.equal(deposited - traded - remainderCreated);
+
+        });
+      });
+    });
+  });
+
+  describe('.withdraw', () => {
+    describe('when token is invalid', () => {
+      it('should revert', async () => {
+        const { exchange, alice } = await loadFixture(deployExchangeFixture);
+
+        await expect(exchange.connect(alice).withdraw(ethers.ZeroAddress, 100))
+          .to.be.revertedWith('Invalid token');
+      });
+    });
+
+    describe('when amount is invalid', () => {
+      it('should revert', async () => {
+        const { exchange, alice, addressTokenA, toTokenA } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(1000n));
+        await expect(exchange.connect(alice).withdraw(addressTokenA, 0))
+          .to.be.revertedWith('Invalid amount');
+      });
+    });
+
+    describe('when trader has not enough balance', () => {
+      it('should revert', async () => {
+        const { exchange, alice, addressTokenA, toTokenA } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(999n));
+        await expect(exchange.connect(alice).withdraw(addressTokenA, toTokenA(1000n)))
+          .to.be.revertedWith('Not enough balance');
+      });
+    });
+
+    describe('when trader does not cancel a buy order', () => {
+      it('it should revert', async () => {
+        const { exchange, alice, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n));
+        await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(10n));
+
+        await expect(exchange.connect(alice).withdraw(addressTokenB, toTokenB(10n)))
+          .to.be.revertedWith('Not enough balance');        
+      });
+    });
+
+    describe('when trader does not cancel a sell order', () => {
+      it('it should revert', async () => {
+        const { exchange, alice, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+        await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n));
+        await expect(exchange.connect(alice).withdraw(addressTokenA, toTokenA(10n)))
+          .to.be.revertedWith('Not enough balance');        
+      });
+    });
+
+    describe('when trader does not cancel the order', () => {
+      it('it should revert', async () => {
+        const { exchange, alice, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+        await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n));
+        await expect(exchange.connect(alice).withdraw(addressTokenA, toTokenA(10n)))
+          .to.be.revertedWith('Not enough balance');        
+      });
+    });
+
+    describe('when trader has balance', () => {
+      it('it should withdraw', async () => {
+        const { exchange, alice, addressTokenA, toTokenA } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+        expect(await exchange.balanceOf(alice.address, addressTokenA)).to.equal(toTokenA(10n));
+        
+        const withdraw = await exchange.connect(alice).withdraw(addressTokenA, toTokenA(10n));
+        expect(await exchange.balanceOf(alice.address, addressTokenA)).to.equal(0);
+
+        expect(withdraw).to.emit(exchange, "Withdraw").withArgs(alice.address, addressTokenA, toTokenA(10n));
+
+      });
+    });
+  });
+
+  describe('.deposit', () => {
+    describe('when amount is invalid', () => {
+      it('should revert', async () => {
+        const { exchange, alice, addressTokenA, toTokenA } = await loadFixture(deployExchangeFixture);
+
+        await expect(exchange.connect(alice).deposit(addressTokenA, toTokenA(0n)))
+          .to.be.revertedWith('Invalid amount');
+      });
+    });
+
+    describe('when token is invalid', () => {
+      it('should revert', async () => {
+        const { exchange, alice } = await loadFixture(deployExchangeFixture);
+
+        await expect(exchange.connect(alice).deposit(ethers.ZeroAddress, 100))
+          .to.be.revertedWith('Invalid token');
+      });
+    });
+
+    describe('when deposit is valid', () => {
+      it('should deposit', async () => {
+        const { exchange, alice, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+
+        await exchange.connect(alice).deposit(addressTokenA, toTokenA(100n));
+        await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n));
+
+        expect(await exchange.balanceOf(alice.address, addressTokenA)).to.equal(toTokenA(100n))
+        expect(await exchange.balanceOf(alice.address, addressTokenB)).to.equal(toTokenB(1000n))
+      });
+    });
+  });
+
+  describe('.cancelOrder', () => {    
+    describe('when order dont exists', () => {
+      it('should revert', async () => {
+        const { exchange, alice } = await loadFixture(deployExchangeFixture);
+
+        await expect(exchange.connect(alice).cancelOrder(1, true)).to.be.revertedWith('Order do not exists');
+      });
+    });
+
+    describe('when order exists', () => {
+      describe('when is buy Order', () => {
+        describe('when caller is not the order owner', () => {
+          it('should revert', async () => {
+            const { exchange, alice, bob, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+            await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n));
+            await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(10n));
+            await expect(exchange.connect(bob).cancelOrder(1, true)).to.be.revertedWith('Only the order creator can cancel this order');
+          });
+        });
+        describe('when order is fulfilled', () => {
+          it('should revert', async () => {
+            const { exchange, alice, bob, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+            await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n));
+            await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(10n));
+            await exchange.connect(bob).deposit(addressTokenA, toTokenA(10n));
+            await exchange.connect(bob).placeSellOrder(toTokenB(100n), toTokenA(10n));
+  
+            await expect(exchange.connect(alice).cancelOrder(1, true)).to.be.revertedWith('Order do not exists');
+          });
+        });
+  
+        describe('when caller is the orders owner', () => {
+          it('should cancel order and refund balance', async () => {
+            const { exchange, alice, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+            await exchange.connect(alice).deposit(addressTokenB, toTokenB(1000n));
+            await exchange.connect(alice).placeBuyOrder(toTokenB(100n), toTokenA(10n));
+  
+            expect(await exchange.balanceOf(alice.address, addressTokenB)).to.be.equal(0);
+  
+            const cancelation = await exchange.connect(alice).cancelOrder(1, true);
+  
+            expect(await exchange.balanceOf(alice.address, addressTokenB)).to.be.equal(toTokenB(1000n));
+  
+            await expect(cancelation).to.emit(exchange, 'OrderCanceled').withArgs(true, 1, alice.address);          
+  
+          });
+        });
+      });
+
+      describe('when is sell Order', () => {
+        describe('when caller is not the order owner', () => {
+          it('should revert', async () => {
+            const { exchange, alice, bob, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+            await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+            await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n));
+            await expect(exchange.connect(bob).cancelOrder(1, false)).to.be.revertedWith('Only the order creator can cancel this order');
+          });
+        });
+
+        describe('when order is fulfilled', () => {
+          it('should revert', async () => {
+            const { exchange, alice, bob, addressTokenA, addressTokenB, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+            await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+            await exchange.connect(bob).deposit(addressTokenB, toTokenB(1000n));
+            
+            await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n));
+            await exchange.connect(bob).placeBuyOrder(toTokenB(100n), toTokenA(10n));
+  
+            await expect(exchange.connect(alice).cancelOrder(1, false)).to.be.revertedWith('Order do not exists');
+          });
+        });
+  
+        describe('when caller is the orders owner', () => {
+          it('should cancel order and refund balance', async () => {
+            const { exchange, alice, addressTokenA, toTokenA, toTokenB } = await loadFixture(deployExchangeFixture);
+            await exchange.connect(alice).deposit(addressTokenA, toTokenA(10n));
+            await exchange.connect(alice).placeSellOrder(toTokenB(100n), toTokenA(10n));
+  
+            expect(await exchange.balanceOf(alice.address, addressTokenA)).to.be.equal(0);
+  
+            const cancelation = await exchange.connect(alice).cancelOrder(1, false);
+  
+            expect(await exchange.balanceOf(alice.address, addressTokenA)).to.be.equal(toTokenA(10n));
+  
+            await expect(cancelation).to.emit(exchange, 'OrderCanceled').withArgs(false, 1, alice.address);          
+  
+          });
+        });
+      });
+    });
+  });
+});
diff --git a/test/orderbook/load/exchange.load-2.test.ts b/test/orderbook/load/exchange.load-2.test.ts
new file mode 100644
index 0000000..d052082
--- /dev/null
+++ b/test/orderbook/load/exchange.load-2.test.ts
@@ -0,0 +1,348 @@
+import { ethers } from 'hardhat';
+import { expect } from 'chai';
+import Utils, { Operator } from '../../utils';
+import { AccountId, PrivateKey, TokenId, ContractId, Client, ContractFunctionParameters, TransactionRecord, AccountCreateTransaction, Hbar, StatusError } from '@hashgraph/sdk';
+import { AbiCoder } from 'ethers';
+import { bytecode as ExchangeHTSbytecode } from '../../../data/abis/ExchangeHTS.json';
+import elliptic from 'elliptic';
+
+const depositToken = async (client: Client, operator: Operator, contract: ContractId, tokenId: TokenId | string, amount: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+
+  if (typeof tokenId != 'string') {
+    tokenId = `0x${tokenId.toSolidityAddress()}`;
+  }
+
+  const functionName = "deposit";
+  const params = new ContractFunctionParameters()
+    .addAddress(tokenId)
+    .addInt64(amount.toString());
+  
+  const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params);
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return {receipt, record};
+}
+
+const placeBuyOrder = async (client: Client, operator: Operator, contract: ContractId, price: number, volume: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "placeBuyOrder";
+  const params = new ContractFunctionParameters()
+    .addInt64(price.toString())
+    .addInt64(volume.toString());
+  
+    const { receipt, record }  = await Utils.executeContract(client, operator, contract, functionName, params, { gas : 600_000});
+    
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const queryBalanceOfExchange = async (client: Client, contract: ContractId, userAddress: string, tokenAddress: string) => {
+  const functionName = "balanceOf";
+  const params = new ContractFunctionParameters()
+      .addAddress(userAddress)
+      .addAddress(tokenAddress);
+
+  // Decode the result
+  const result = await Utils.queryContract(client, contract, functionName, params);
+  const balance = result.getInt64(0); // Adjust based on your function's return type
+  return balance;
+}
+
+const placeSellOrder = async (client: Client, operator: Operator, contract: ContractId, price: number, volume: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "placeSellOrder";
+  const params = new ContractFunctionParameters()
+    .addInt64(price.toString())
+    .addInt64(volume.toString());
+  
+    const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params, { gas : 600_000});
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const eventsEmited = (record: TransactionRecord, eventTopic: string) => {
+  return record.contractFunctionResult?.logs.reduce((acc: Uint8Array[], log) => {
+    for (const topic of log.topics) {
+      const pTopic = `0x${Buffer.from(topic).toString('hex')}`;
+      if (pTopic === eventTopic) {
+        acc.push(log.data);
+      }
+    }
+    return acc;
+  }, [])
+}
+
+function getRandomInt(min: number, max: number) {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+function returnOneOf<T>(list: T[], except?: T) {
+  if (list.length === 0) {
+    throw new Error('returnOneOf: empty list');
+  }
+
+  let filteredList = except !== undefined ? list.filter(item => item !== except) : list;
+
+  if (filteredList.length === 0) {
+    return list[0]; // Handle case where all items are excluded
+  }
+
+  const randomIndex = Math.floor(Math.random() * filteredList.length);
+  return filteredList[randomIndex];
+}
+
+const createECDSAKeyPair = () => {
+  const EC = elliptic.ec;
+  const ec = new EC('secp256k1');
+  const keyPair = ec.genKeyPair();
+  const privateKey = keyPair.getPrivate('hex');
+  const publicKey = keyPair.getPublic('hex');
+
+  return { privateKey, publicKey }
+}
+
+const createAccount = async (client: Client, operator: Operator): Promise<Operator> => {
+
+  client.setOperator(operator.accountId, operator.key);
+
+  const key = PrivateKey.fromStringECDSA(createECDSAKeyPair().privateKey);
+  const accountCreate = new AccountCreateTransaction()
+    .setKey(key)
+    .setInitialBalance(new Hbar(3))
+    .setTransactionValidDuration(180)
+    .freezeWith(client);
+
+  const tx = await accountCreate.execute(client);
+  const receipt = await tx.getReceipt(client);
+
+  console.log(`- account created with id ${receipt.accountId}`)
+  
+  return { accountId: receipt.accountId as AccountId, key, address: `0x${receipt.accountId?.toSolidityAddress()}` };
+}
+
+const retryThat = async (action: string, maxRetries: number, retryDelay: number, callback: Function) => {
+  let attempt = 0;
+  while (attempt < maxRetries) {
+    try{
+      const result = await callback();
+
+      return result;
+    } catch (error) {
+      //@ts-ignore
+      console.error(`---- Error ${action}: ${error?.message} ----`);
+
+      if (error instanceof StatusError && error.status.toString() === 'TRANSACTION_EXPIRED') {
+          attempt++;
+          console.warn(`Transaction expired. Retry attempt ${attempt}/${maxRetries}`);
+          if (attempt < maxRetries) {
+              await new Promise(resolve => setTimeout(resolve, retryDelay));
+          }
+      } else {
+        throw error;
+      }
+    }
+  }
+}
+
+async function deployExchangeFixture() {
+  const client = Client.forTestnet().setMaxAttempts(10000)
+  //Create your local client
+  // const node = {"127.0.0.1:50211": new AccountId(3)};
+  // const client = Client.forNetwork(node).setMirrorNetwork("127.0.0.1:5600")
+    // .setMaxAttempts(100_000_000)
+    // .setMaxBackoff(100_000_000);
+      
+  const operatorAccountId = AccountId.fromString(process.env.ACCOUNT_ID as string);
+  const operatorPrivateKey = PrivateKey.fromStringECDSA(process.env.PRIVATE_KEY as string);
+  
+
+  const operator = {
+    accountId: operatorAccountId,
+    key: operatorPrivateKey,
+    address: '0x' + (operatorAccountId.toSolidityAddress().toLowerCase())
+  }
+
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+
+  // client.setOperator(AccountId.fromString("0.0.2"),PrivateKey.fromStringED25519("302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137"));
+
+  const idTokenA = TokenId.fromSolidityAddress("0x000000000000000000000000000000000043cca1");
+  const idTokenB = TokenId.fromSolidityAddress("0x000000000000000000000000000000000043cca2");
+  const exchangeId = ContractId.fromString("0.0.4443300");
+  // const idTokenA = await Utils.createFungibleToken(client, operator.accountId, operator.key, 'Test Token A', 'TOKEN_A');
+  // const idTokenB = await Utils.createFungibleToken(client, operator.accountId, operator.key, 'Test Token B', 'TOKEN_B');
+
+  const addressTokenA = '0x' + idTokenA.toSolidityAddress();
+  const addressTokenB = '0x' + idTokenB.toSolidityAddress();
+
+  // const exchangeId = await Utils.deployContract(
+  //   client, 
+  //   operator, 
+  //   ExchangeHTSbytecode, 
+  //   [addressTokenA, addressTokenB]
+  // );
+
+  // console.log(`deployed exchange at ${exchangeId} or ${exchangeId.toSolidityAddress()}`)
+
+  const toTokenA = (_number: number) => {
+    return _number * 10 ** 8;
+  }
+
+  const toTokenB = (_number: number) => {
+    return _number * 10 ** 8;
+  }
+
+  const fromTokenA = (_number: number) => {
+    return _number / 10 ** 8;
+  }
+
+  const fromTokenB = (_number: number) => {
+    return _number / 10 ** 8;
+  }
+
+  const minting = [
+    Utils.tokenMint(client, operator, idTokenA, toTokenA(100_000_000)),
+    Utils.tokenMint(client, operator, idTokenB, toTokenB(100_000_000)),
+  ];
+  
+  await Promise.all(minting);    
+
+  return {
+    client,
+    operator,
+    exchangeId,
+    idTokenA,
+    idTokenB,
+    toTokenA,
+    toTokenB,
+    addressTokenA,
+    addressTokenB,
+    fromTokenA,
+    fromTokenB
+  }
+}
+
+describe('Load Test Exchange HTS', () => {
+  describe('Exchange', () => {
+    it('should load test', async () => {
+      const { client, operator, exchangeId, idTokenB, idTokenA, toTokenB, toTokenA, addressTokenA, addressTokenB, fromTokenA, fromTokenB } = await deployExchangeFixture();
+
+      function hasTradeEvent (record: TransactionRecord) {
+        const tradeEvent = eventsEmited(record, ethers.id("Trade(int64,int64,address,address)")) as Uint8Array [];          
+        if (tradeEvent.length){
+          for( const trade of tradeEvent) {
+            const parsedLogTrade = AbiCoder.defaultAbiCoder().decode(
+              ["uint256", "uint256", "address"],
+              trade
+            );
+            console.log(`-- Trade happend with ${parsedLogTrade.toString()}`);
+          }
+        }
+
+        return tradeEvent.length;
+      }
+
+      const list = new Array(1300).fill(0);
+      const userListSell = (await Promise.allSettled(list.slice(0, list.length / 2).map(async (_, index) => {
+        const price = toTokenB(getRandomInt(1000, 1020))
+        const amount = toTokenA(getRandomInt(1, 5));
+
+        return retryThat('Creating Sell User', 5, 200, async () => {
+          const newAccount = await createAccount(client, operator);
+          await Utils.associateTokenToAccount(client, idTokenA, newAccount);
+          await Utils.transferToken(client, idTokenA, operator, newAccount.accountId, amount);
+          await Utils.approveToken(client, idTokenA, newAccount, exchangeId, (amount));
+          await depositToken(client, newAccount, exchangeId, idTokenA, amount);
+          return { account: newAccount, price: price, amount: amount }
+        });
+
+      })))
+      .filter(p => p.status === 'fulfilled')
+      // @ts-ignore
+      .map((p) => p.value);
+
+      const userListBuy = (await Promise.allSettled(list.slice(list.length / 2).map(async (_, index) => {
+        const price = getRandomInt(1000, 1020);
+        const amount = getRandomInt(1, 5);
+
+        return retryThat('Creating Buy User', 5, 200, async () => {
+          const newAccount = await createAccount(client, operator);
+          await Utils.associateTokenToAccount(client, idTokenB, newAccount);
+          await Utils.transferToken(client, idTokenB, operator, newAccount.accountId, toTokenB(price * amount));
+          await Utils.approveToken(client, idTokenB, newAccount, exchangeId, toTokenB(price * amount));
+          await depositToken(client, newAccount, exchangeId, idTokenB, toTokenB(price * amount));
+          
+          return { account: newAccount, price: toTokenB(price), amount: toTokenA(amount) }        
+        });
+        
+      })))
+      .filter(p => p.status === 'fulfilled')
+      // @ts-ignore
+      .map((p) => p.value);
+
+      const buyOrders = userListBuy.map(async (trader, index) => {
+        await new Promise((res) => { setTimeout(() => {res(true)}, 200 * index)});
+        const { record: recordBuy} = await placeBuyOrder(client, trader.account, exchangeId, trader.price, trader.amount);
+        hasTradeEvent(recordBuy);
+        return trader;
+      });
+
+      const sellOrders = userListSell.map(async (trader, index) => {
+        await new Promise((res) => { setTimeout(() => {res(true)}, 200 * (index + 1))});
+        const { record: recordSell } = await placeSellOrder(client, trader.account, exchangeId, trader.price, trader.amount);
+        hasTradeEvent(recordSell);
+        return trader;
+      })
+
+      try {  
+        const results = await Promise.allSettled([...buyOrders, ...sellOrders]);
+        const rejected = results.filter(r => r.status === 'rejected');
+        const fulfilled = results.filter(r => r.status === 'fulfilled');
+
+
+        console.log({
+          status: 'rejected',
+          len : rejected.length,
+          // @ts-ignore
+          ids: rejected.map(rej => rej?.reason?.transactionId)
+        })
+
+        console.log({
+          fulfilled: {
+            len: fulfilled.length,
+          }
+        });
+
+      } catch (error) {
+        console.error("Error placing orders");
+        console.error(error);
+        expect.fail('Error placing orders');
+      }
+
+    });
+  });
+});
+
diff --git a/test/orderbook/load/exchange.load.test.ts b/test/orderbook/load/exchange.load.test.ts
new file mode 100644
index 0000000..9de8452
--- /dev/null
+++ b/test/orderbook/load/exchange.load.test.ts
@@ -0,0 +1,413 @@
+import { ethers } from 'hardhat';
+import { expect } from 'chai';
+import Utils, { Operator } from '../../utils';
+import { AccountId, PrivateKey, TokenId, ContractId, Client, ContractFunctionParameters, TransactionRecord, AccountCreateTransaction, Hbar } from '@hashgraph/sdk';
+import { AbiCoder } from 'ethers';
+import { bytecode as ExchangeHTSbytecode } from '../../../data/abis/ExchangeHTS.json';
+import elliptic from 'elliptic';
+
+const depositToken = async (client: Client, operator: Operator, contract: ContractId, tokenId: TokenId | string, amount: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+
+  if (typeof tokenId != 'string') {
+    tokenId = `0x${tokenId.toSolidityAddress()}`;
+  }
+
+  const functionName = "deposit";
+  const params = new ContractFunctionParameters()
+    .addAddress(tokenId)
+    .addInt64(amount.toString());
+  
+    const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params);
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return {receipt, record};
+}
+
+const placeBuyOrder = async (client: Client, operator: Operator, contract: ContractId, price: number, volume: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "placeBuyOrder";
+  const params = new ContractFunctionParameters()
+    .addInt64(price.toString())
+    .addInt64(volume.toString());
+  
+    const { receipt, record }  = await Utils.executeContract(client, operator, contract, functionName, params, { gas : 600_000});
+    
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const queryBalanceOfExchange = async (client: Client, contract: ContractId, userAddress: string, tokenAddress: string) => {
+  const functionName = "balanceOf";
+  const params = new ContractFunctionParameters()
+      .addAddress(userAddress)
+      .addAddress(tokenAddress);
+
+  // Decode the result
+  const result = await Utils.queryContract(client, contract, functionName, params);
+  const balance = result.getInt64(0); // Adjust based on your function's return type
+  return balance;
+}
+
+const placeSellOrder = async (client: Client, operator: Operator, contract: ContractId, price: number, volume: number) => {
+  client.setOperator(
+    operator.accountId,
+    operator.key
+  );
+  const functionName = "placeSellOrder";
+  const params = new ContractFunctionParameters()
+    .addInt64(price.toString())
+    .addInt64(volume.toString());
+  
+    const { receipt, record } = await Utils.executeContract(client, operator, contract, functionName, params, { gas : 600_000});
+  
+  if (receipt.status._code != 22) {
+    throw new Error('Error depositing token status code' + receipt.status._code);
+  }
+
+  return { receipt, record };
+}
+
+const eventsEmited = (record: TransactionRecord, eventTopic: string) => {
+  return record.contractFunctionResult?.logs.reduce((acc: Uint8Array[], log) => {
+    for (const topic of log.topics) {
+      const pTopic = `0x${Buffer.from(topic).toString('hex')}`;
+      if (pTopic === eventTopic) {
+        acc.push(log.data);
+      }
+    }
+    return acc;
+  }, [])
+}
+
+function getRandomInt(min: number, max: number) {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+function returnOneOf<T>(list: T[], except?: T) {
+  if (list.length === 0) {
+    throw new Error('returnOneOf: empty list');
+  }
+
+  let filteredList = except !== undefined ? list.filter(item => item !== except) : list;
+
+  if (filteredList.length === 0) {
+    return list[0]; // Handle case where all items are excluded
+  }
+
+  const randomIndex = Math.floor(Math.random() * filteredList.length);
+  return filteredList[randomIndex];
+}
+
+
+const createECDSAKeyPair = () => {
+  const EC = elliptic.ec;
+  const ec = new EC('secp256k1');
+  const keyPair = ec.genKeyPair();
+  const privateKey = keyPair.getPrivate('hex');
+  const publicKey = keyPair.getPublic('hex');
+
+  return { privateKey, publicKey }
+}
+
+const createAccount = async (client: Client, operator: Operator): Promise<Operator> => {
+
+  client.setOperator(operator.accountId, operator.key);
+
+  const key = PrivateKey.fromStringECDSA(createECDSAKeyPair().privateKey);
+  const accountCreate = new AccountCreateTransaction()
+    .setKey(key)
+    .setInitialBalance(new Hbar(1000))
+    .freezeWith(client);
+
+  const tx = await accountCreate.execute(client);
+  const receipt = await tx.getReceipt(client);
+
+  console.log(`- account created with id ${receipt.accountId}`)
+  
+  return { accountId: receipt.accountId as AccountId, key, address: `0x${receipt.accountId?.toSolidityAddress()}` };
+}
+
+async function deployExchangeFixture() {
+  const node = {"127.0.0.1:50211": new AccountId(3)};
+  const client = Client.forNetwork(node).setMirrorNetwork("127.0.0.1:5600").setMaxAttempts(100_000_000).setMaxBackoff(100_000_000);
+      
+  const operatorAccountId = AccountId.fromString(process.env.ACCOUNT_ID as string);
+  const operatorPrivateKey = PrivateKey.fromStringED25519(process.env.PRIVATE_KEY as string);
+  
+  const aliceAccountId = AccountId.fromString(process.env.ALICE_ACCOUNT_ID as string);
+  const alicePrivateKey = PrivateKey.fromStringED25519(process.env.ALICE_KEY as string);
+  
+  const bobAccountId = AccountId.fromString(process.env.BOB_ACCOUNT_ID as string);
+  const bobPrivateKey = PrivateKey.fromStringECDSA(process.env.BOB_KEY as string);
+  
+  const charlieAccountId = AccountId.fromString(process.env.CHARLIE_ACCOUNT_ID as string);
+  const charliePrivateKey = PrivateKey.fromStringECDSA(process.env.CHARLIE_KEY as string);
+  
+  const davidAccountId = AccountId.fromString(process.env.DAVID_ACCOUNT_ID as string);
+  const davidPrivateKey = PrivateKey.fromStringED25519(process.env.DAVID_KEY as string);
+
+  const operator = {
+    accountId: operatorAccountId,
+    key: operatorPrivateKey,
+    address: '0x' + (operatorAccountId.toSolidityAddress().toLowerCase())
+  }
+
+ 
+  // {
+  //   accountId: aliceAccountId,
+  //   key: alicePrivateKey,
+  //   address: '0x' + (aliceAccountId.toSolidityAddress().toLowerCase())
+  // }
+
+  // const bob = {
+  //   accountId: bobAccountId,
+  //   key: bobPrivateKey,
+  //   address: '0x' + (bobAccountId.toSolidityAddress().toLowerCase())
+  // }
+
+  // const charlie = {
+  //   accountId: charlieAccountId,
+  //   key: charliePrivateKey,
+  //   address: '0x' + (charlieAccountId.toSolidityAddress().toLowerCase())
+  // }
+
+  // const david = {
+  //   accountId: davidAccountId,
+  //   key: davidPrivateKey,
+  //   address: '0x' + (davidAccountId.toSolidityAddress().toLowerCase())
+  // }
+
+  // client.setOperator(
+  //   operator.accountId,
+  //   operator.key
+  // );
+
+  client.setOperator(AccountId.fromString("0.0.2"),PrivateKey.fromStringED25519("302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137"));
+
+  const alice = await createAccount(client, operator) 
+  const bob = await createAccount(client, operator) 
+  const charlie = await createAccount(client, operator) 
+  const david = await createAccount(client, operator) 
+
+  // const idTokenA = TokenId.fromString('0.0.4421954');
+  // const idTokenB = TokenId.fromString('0.0.4421955');
+  // const exchangeId = ContractId.fromString("0.0.4422160");
+  const idTokenA = await Utils.createFungibleToken(client, operator.accountId, operator.key, 'Test Token A', 'TOKEN_A');
+  const idTokenB = await Utils.createFungibleToken(client, operator.accountId, operator.key, 'Test Token B', 'TOKEN_B');
+
+  const addressTokenA = '0x' + idTokenA.toSolidityAddress();
+  const addressTokenB = '0x' + idTokenB.toSolidityAddress();
+
+  const exchangeId = await Utils.deployContract(
+    client, 
+    operator, 
+    ExchangeHTSbytecode, 
+    [addressTokenA, addressTokenB]
+  );
+
+  console.log(`deployed exchange at ${exchangeId} or ${exchangeId.toSolidityAddress()}`)
+
+  const toTokenA = (_number: number) => {
+    return _number * 10 ** 8;
+  }
+
+  const toTokenB = (_number: number) => {
+    return _number * 10 ** 8;
+  }
+
+  const fromTokenA = (_number: number) => {
+    return _number / 10 ** 8;
+  }
+
+  const fromTokenB = (_number: number) => {
+    return _number / 10 ** 8;
+  }
+
+  const minting = [
+    Utils.tokenMint(client, operator, idTokenA, toTokenA(1_000_000 * 4)),
+    Utils.tokenMint(client, operator, idTokenB, toTokenB(1_000_000 * 4)),
+  ];
+  
+  await Promise.all(minting);    
+
+  const associations = [
+    // token A
+    Utils.associateTokenToAccount(client, idTokenA, alice),
+    Utils.associateTokenToAccount(client, idTokenA, bob),
+    Utils.associateTokenToAccount(client, idTokenA, charlie),
+    Utils.associateTokenToAccount(client, idTokenA, david),
+    // token B
+    Utils.associateTokenToAccount(client, idTokenB, alice),
+    Utils.associateTokenToAccount(client, idTokenB, bob),
+    Utils.associateTokenToAccount(client, idTokenB, charlie),
+    Utils.associateTokenToAccount(client, idTokenB, david),
+  ];
+
+  await Promise.all(associations);    
+
+  const transfers = [
+    // token A
+    Utils.transferToken(client, idTokenA, operator, alice.accountId, toTokenA(1_000_000)),
+    Utils.transferToken(client, idTokenA, operator, bob.accountId, toTokenA(1_000_000)),
+    Utils.transferToken(client, idTokenA, operator, charlie.accountId, toTokenA(1_000_000)),
+    Utils.transferToken(client, idTokenA, operator, david.accountId, toTokenA(1_000_000)),
+    // // token B
+    Utils.transferToken(client, idTokenB, operator, alice.accountId, toTokenB(1_000_000)),
+    Utils.transferToken(client, idTokenB, operator, bob.accountId, toTokenB(1_000_000)),
+    Utils.transferToken(client, idTokenB, operator, charlie.accountId, toTokenB(1_000_000)),
+    Utils.transferToken(client, idTokenB, operator, david.accountId, toTokenB(1_000_000)),
+    // token A
+    Utils.approveToken(client, idTokenA, alice, exchangeId, toTokenA(1_000_000)),
+    Utils.approveToken(client, idTokenA, bob, exchangeId, toTokenA(1_000_000)),
+    Utils.approveToken(client, idTokenA, charlie, exchangeId, toTokenA(1_000_000)),
+    Utils.approveToken(client, idTokenA, david, exchangeId, toTokenA(1_000_000)),
+    // token B
+    Utils.approveToken(client, idTokenB, alice, exchangeId, toTokenB(1_000_000)),
+    Utils.approveToken(client, idTokenB, bob, exchangeId, toTokenB(1_000_000)),
+    Utils.approveToken(client, idTokenB, charlie, exchangeId, toTokenB(1_000_000)),
+    Utils.approveToken(client, idTokenB, david, exchangeId, toTokenB(1_000_000)),
+  ];
+
+  await Promise.all(transfers);    
+
+  return {
+    client,
+    operator,
+    alice,
+    bob,
+    charlie,
+    david,
+    exchangeId,
+    idTokenA,
+    idTokenB,
+    toTokenA,
+    toTokenB,
+    addressTokenA,
+    addressTokenB,
+    fromTokenA,
+    fromTokenB
+  }
+}
+
+describe('Load Test Exchange HTS', () => {
+  describe('Exchange', () => {
+    it('should load test', async () => {
+      const { client, alice, bob, charlie, david, exchangeId, idTokenB, idTokenA, toTokenB, toTokenA, addressTokenA, addressTokenB, fromTokenA, fromTokenB } = await deployExchangeFixture();
+
+      // deposits
+      await Promise.all([
+        depositToken(client, alice, exchangeId, idTokenA, toTokenA(1_000_000)),
+        depositToken(client, bob, exchangeId, idTokenA, toTokenA(1_000_000)),
+        depositToken(client, charlie, exchangeId, idTokenA, toTokenA(1_000_000)),
+        depositToken(client, david, exchangeId, idTokenA, toTokenA(1_000_000)),
+
+        depositToken(client, alice, exchangeId, idTokenB, toTokenB(1_000_000)),
+        depositToken(client, bob, exchangeId, idTokenB, toTokenB(1_000_000)),
+        depositToken(client, charlie, exchangeId, idTokenB, toTokenB(1_000_000)),
+        depositToken(client, david, exchangeId, idTokenB, toTokenB(1_000_000)),
+      ]);
+
+      function hasTradeEvent (record: TransactionRecord) {
+        const tradeEvent = eventsEmited(record, ethers.id("Trade(int64,int64,address,address)")) as Uint8Array [];          
+        if (tradeEvent.length){
+          for( const trade of tradeEvent) {
+            const parsedLogTrade = AbiCoder.defaultAbiCoder().decode(
+              ["uint256", "uint256", "address"],
+              trade
+            );
+            console.log(`-- Trade happend with ${parsedLogTrade.toString()}`);
+          }
+        }
+
+        return tradeEvent.length;
+      }
+
+      const list = new Array(100).fill(0);
+
+      const buyOrders = list.map(async (order, index) => {
+        await new Promise((res) => { setTimeout(() => {res(true)}, 300 * index)});
+        const buyer = returnOneOf<Operator>([alice, bob, charlie, david]);
+        const { record: recordBuy} = await placeBuyOrder(client, buyer, exchangeId, toTokenB(getRandomInt(1000, 1020)), toTokenA(getRandomInt(1, 5)));
+        hasTradeEvent(recordBuy);
+        return order;
+      });
+
+      const sellOrders = list.map(async (order, index) => {
+        await new Promise((res) => { setTimeout(() => {res(true)}, 200 * (index + 1))});
+        const seller = returnOneOf<Operator>([alice, bob, charlie, david]);
+        const { record: recordSell } = await placeSellOrder(client, seller, exchangeId, toTokenB(getRandomInt(1000, 1020)), toTokenA(getRandomInt(1, 15)));
+        hasTradeEvent(recordSell);
+        return order;
+      })
+
+      try {  
+        const results = await Promise.allSettled([...buyOrders, ...sellOrders]);
+        const rejected = results.filter(r => r.status === 'rejected');
+        const fulfilled = results.filter(r => r.status === 'fulfilled');
+
+
+        console.log({
+          status: 'rejected',
+          len : rejected.length,
+          // @ts-ignore
+          ids: rejected.map(rej => rej.reason.transactionId.toString())
+        })
+
+        console.log({
+          fulfilled: {
+            len: fulfilled.length,
+          }
+        });
+
+
+      } catch (error) {
+        console.error("Error placing orders");
+        console.error(error);
+        expect.fail('Error placing orders');
+      }
+
+
+
+      const aliceTokenABalance = (await queryBalanceOfExchange(client, exchangeId, alice.address, addressTokenA)).toNumber();
+      const aliceTokenBBalance = (await queryBalanceOfExchange(client, exchangeId, alice.address, addressTokenB)).toNumber();
+      
+      const bobTokenABalance = (await queryBalanceOfExchange(client, exchangeId, "0xed9a4895a19483001d7228354d714e7ea4523d4b", addressTokenA)).toNumber();
+      const bobTokenBBalance = (await queryBalanceOfExchange(client, exchangeId, "0xed9a4895a19483001d7228354d714e7ea4523d4b", addressTokenB)).toNumber();
+      
+      const charlieTokenABalance = (await queryBalanceOfExchange(client, exchangeId, "0xb8c8d838121d5bf0a7b022737b34b13eb9fa5bea", addressTokenA)).toNumber();
+      const charlieTokenBBalance = (await queryBalanceOfExchange(client, exchangeId, "0xb8c8d838121d5bf0a7b022737b34b13eb9fa5bea", addressTokenB)).toNumber();
+      
+      const davidTokenABalance = (await queryBalanceOfExchange(client, exchangeId, david.address, addressTokenA)).toNumber();
+      const davidTokenBBalance = (await queryBalanceOfExchange(client, exchangeId, david.address, addressTokenB)).toNumber();
+
+
+      console.log({
+        aliceTokenABalance: fromTokenA(aliceTokenABalance),
+        bobTokenABalance: fromTokenA(bobTokenABalance),
+        charlieTokenABalance: fromTokenA(charlieTokenABalance),
+        davidTokenABalance: fromTokenA(davidTokenABalance),
+        aliceTokenBBalance: fromTokenB(aliceTokenBBalance),
+        bobTokenBBalance: fromTokenB(bobTokenBBalance),
+        charlieTokenBBalance: fromTokenB(charlieTokenBBalance),
+        davidTokenBBalance: fromTokenB(davidTokenBBalance),
+      })
+      
+
+
+    });
+  });
+});
+
diff --git a/test/orderbook/load/transfer.test.ts b/test/orderbook/load/transfer.test.ts
new file mode 100644
index 0000000..b3a8ef6
--- /dev/null
+++ b/test/orderbook/load/transfer.test.ts
@@ -0,0 +1,34 @@
+import { ethers } from 'hardhat';
+import { expect } from 'chai';
+import Utils from '../../utils';
+import { AccountId, PrivateKey, Client } from '@hashgraph/sdk';
+
+async function fixture() {
+  const client = Client.forTestnet();
+      
+  const operatorAccountId = AccountId.fromString('');
+  const operatorPrivateKey = PrivateKey.fromStringED25519("");
+
+  const operator = {
+    accountId: operatorAccountId,
+    key: operatorPrivateKey,
+    address: '0x' + (operatorAccountId.toSolidityAddress().toLowerCase())
+  }
+
+  return {
+    client,
+    operator,
+  }
+}
+
+describe('Load Test Exchange HTS', () => {
+  describe('Exchange', () => {
+    it('should load test', async () => {
+      const { client, operator } = await fixture();
+      
+      await Utils.transferHbar(client, operator, AccountId.fromString('0.0.3640088'), 999);
+
+    });
+  });
+});
+
diff --git a/test/utils.ts b/test/utils.ts
new file mode 100644
index 0000000..c8b0f7e
--- /dev/null
+++ b/test/utils.ts
@@ -0,0 +1,317 @@
+import {
+  AccountId,
+  Client,
+  ContractId,
+  PrivateKey,
+  TokenId,
+  ContractExecuteTransaction,
+  AccountAllowanceApproveTransaction,
+  TransferTransaction,
+  TokenAssociateTransaction,
+  FileAppendTransaction,
+  ContractFunctionParameters,
+  ContractCreateTransaction,
+  FileCreateTransaction,
+  TokenCreateTransaction,
+  AccountCreateTransaction,
+  TokenMintTransaction,
+  TokenType,
+  TokenSupplyType,
+  TransactionReceipt,
+  TokenUpdateTransaction,
+  Hbar,
+  Key,
+  FileId,
+  ContractCallQuery,
+  AccountBalanceQuery,
+  TransactionRecord,
+} from '@hashgraph/sdk';
+import axios from 'axios';
+
+export interface Operator {
+  accountId: AccountId; 
+  key: PrivateKey;
+  address: string;
+}
+
+class Utils {
+  async transferHbar(client: Client, from: Operator, to: string | AccountId, amount: number) {
+    client.setOperator(
+      from.accountId,
+      from.key
+    );
+
+    const transferTx = new TransferTransaction()
+      .addHbarTransfer(from.accountId, -amount)
+      .addHbarTransfer(to, amount)
+      .freezeWith(client);
+
+      const transferSign = await transferTx.sign(from.key);
+      const tx = await transferSign.execute(client);
+      const rx = await tx.getReceipt(client);
+
+      if (rx.status._code != 22) {
+        throw new Error('Error transfer token status code' + rx.status._code);
+      }
+
+      console.log(`- transferHbar success with id: ${tx.transactionId}`)
+  }
+
+  async createAccount(client: Client): Promise<Operator> {
+    const key = PrivateKey.fromStringECDSA(process.env.PRIVATE_KEY as string);
+    const adminAccountTx = await new AccountCreateTransaction()
+        .setKey(key.publicKey)
+        .setInitialBalance(new Hbar(10))
+        .execute(client);
+    const adminAccountReceipt = await adminAccountTx.getReceipt(client);
+
+    return { accountId: adminAccountReceipt.accountId as AccountId, key, address: '0x' + adminAccountReceipt.accountId?.toSolidityAddress() } ;
+  }
+
+  async createFungibleToken(client: Client, tresury: AccountId, adminKey: PrivateKey, name: string, symbol: string): Promise<TokenId> {
+    client.setOperator(
+      tresury,
+      adminKey
+    );
+
+    const tokenCreateTx = await new TokenCreateTransaction()
+        .setTokenName(name)
+        .setTokenSymbol(symbol)
+        .setTokenType(TokenType.FungibleCommon)
+        .setSupplyType(TokenSupplyType.Infinite)
+        .setInitialSupply(1000000)
+        .setTreasuryAccountId(tresury)
+        .setSupplyKey(adminKey)
+        .setAdminKey(adminKey)
+        .freezeWith(client);
+
+    const tokenCreateTxSign = await tokenCreateTx.sign(adminKey);
+    const tokenCreateRx = await tokenCreateTxSign.execute(client);
+    const tokenCreateReceipt = await tokenCreateRx.getReceipt(client);
+    return tokenCreateReceipt.tokenId as TokenId;
+  }
+
+  async updateFungibleTokenSuply(client: Client, tokenId: TokenId, adminKey: PrivateKey,  supplyKey: Key | ContractId): Promise<TokenId> {
+    const tokenCreateTx = new TokenUpdateTransaction()
+        .setTokenId(tokenId)
+        .setSupplyKey(supplyKey)
+        .freezeWith(client);
+
+    const tokenCreateTxSign = await tokenCreateTx.sign(adminKey);
+    const tokenCreateRx = await tokenCreateTxSign.execute(client);
+    const tokenCreateReceipt = await tokenCreateRx.getReceipt(client);
+    return tokenCreateReceipt.tokenId as TokenId;
+  }
+
+  async deployContract(client: Client, operator: Operator, bytecode: string, params: any[]): Promise<ContractId> {
+    // Create a file on Hedera and store the bytecode
+    const fileCreateTx = new FileCreateTransaction()
+        .setKeys([operator.key.publicKey])
+        .setMaxTransactionFee(new Hbar(2)) // Set appropriate max transaction fee
+        .freezeWith(client);
+
+    const fileCreateSign = await fileCreateTx.sign(operator.key);
+    const fileCreateSubmit = await fileCreateSign.execute(client);
+    const fileCreateReceipt = await fileCreateSubmit.getReceipt(client);
+    const bytecodeFileId = fileCreateReceipt.fileId as FileId;
+
+    console.log(" - The smart contract bytecode file ID is:", bytecodeFileId.toString());
+    
+    console.log(" - Upload bytecode in chucks");
+    // Append the bytecode in chunks
+    const chunkSize = 4096; // 4 KB
+    for (let i = 0; i < bytecode.length; i += chunkSize) {
+        const chunk = bytecode.slice(i, i + chunkSize);
+        const fileAppendTx = new FileAppendTransaction()
+            .setFileId(bytecodeFileId)
+            .setContents(chunk)
+            .setMaxTransactionFee(new Hbar(2)) // Set appropriate max transaction fee
+            .freezeWith(client);
+        const fileAppendSign = await fileAppendTx.sign(operator.key);
+        await fileAppendSign.execute(client);
+    }
+
+    console.log(" - Bytecode file upload completed.");
+
+    console.log(params[0], params[1])
+    
+    // Create the smart contract
+    const contractTx = new ContractCreateTransaction()
+        .setBytecodeFileId(bytecodeFileId)
+        .setConstructorParameters(
+          new ContractFunctionParameters()
+                  .addAddress(params[0])
+                  .addAddress(params[1])
+        )
+        .setGas(10000000) // Adjust gas as needed
+        .setAdminKey(operator.key) // Optional: Set an admin key to manage the contract
+        .setMaxTransactionFee(new Hbar(16)); // Set appropriate max transaction fee
+
+    const contractResponse = await contractTx.execute(client);
+    const contractReceipt = await contractResponse.getReceipt(client);
+
+    return contractReceipt.contractId as ContractId;
+  }
+
+  async tokenMint(client: Client, operator: Operator, tokenId: TokenId | string, amount: number) {
+    client.setOperator(
+      operator.accountId,
+      operator.key
+    );
+
+      const tokenMintTx = new TokenMintTransaction()
+        .setTokenId(tokenId)
+        .setAmount(amount)
+        .freezeWith(client);
+      
+      const tokenMintSign = await tokenMintTx.sign(operator.key);
+      const tx =  await tokenMintSign.execute(client);
+      const rx =  await tx.getReceipt(client);
+
+      if (rx.status._code != 22) {
+        throw new Error('Error transfer token mint code' + rx.status._code);
+      }
+
+      console.log(`- tokenMint success with id: ${tx.transactionId}`)
+  }
+
+  async associateTokenToAccount(client: Client, tokenId: TokenId | string, account: Operator) {
+    client.setOperator(
+      account.accountId,
+      account.key
+    );
+    // Associate the recipient account with the token
+    const associateTx = new TokenAssociateTransaction()
+      .setAccountId(account.accountId)
+      .setTokenIds([tokenId])
+      .freezeWith(client);
+
+    const associateSign = await associateTx.sign(account.key); // Use the recipient's private key
+    const result = await associateSign.execute(client);
+    const receipt = await result.getReceipt(client);
+
+    if (receipt.status._code != 22) {
+      throw new Error('Error Associating token code' + receipt.status._code);
+    }
+
+    console.log(`- Associate token transaciton executed ${result.transactionId}`);
+  }
+
+  async transferToken(client: Client, tokenId: TokenId | string, from: Operator, to: AccountId, amount: number) {
+    client.setOperator(
+      from.accountId,
+      from.key
+    );
+
+    const transferTx = new TransferTransaction()
+      .addTokenTransfer(tokenId, from.accountId, amount * -1)
+      .addTokenTransfer(tokenId, to, amount * 1)  
+      .freezeWith(client);
+
+      const transferSign = await transferTx.sign(from.key);
+      const tx = await transferSign.execute(client);
+      const rx = await tx.getReceipt(client);
+
+      if (rx.status._code != 22) {
+        throw new Error('Error transfer token status code' + rx.status._code);
+      }
+
+      console.log(`- transferToken success with id: ${tx.transactionId}`)
+
+  }
+
+  async approveToken(client: Client, tokenId: TokenId | string, from: Operator, spender: AccountId | ContractId | string, amount: number) {
+    // Set the operator for the client
+    client.setOperator(from.accountId, from.key);
+
+    // Create the AccountAllowanceApproveTransaction
+    const approveTx = new AccountAllowanceApproveTransaction()
+      .approveTokenAllowance(tokenId, from.accountId, spender, amount)
+      .freezeWith(client);
+
+    // Sign the transaction with the owner's key
+    const approveSign = await approveTx.sign(from.key);
+
+    // Execute the transaction
+    const tx = await approveSign.execute(client);
+
+    // Get the receipt to ensure the transaction was successful
+    const receipt = await tx.getReceipt(client);
+
+    // Check the status code
+    if (receipt.status._code !== 22) {
+      throw new Error('Error approving token status code ' + receipt.status._code);
+    }
+
+    // Log the success message
+    console.log(`- AccountAllowanceApproveTransaction success with id: ${tx.transactionId}`)
+  }
+
+  async executeContract(client: Client, operator: Operator, contract: ContractId | string, functionName: string, params: ContractFunctionParameters, config?: any): Promise<{ receipt: TransactionReceipt, record : TransactionRecord }> {
+    const contractExecuteTx = new ContractExecuteTransaction()
+        .setContractId(contract)
+        .setGas(config?.gas || 1000000) // Adjust based on the complexity of your function
+        .setFunction(functionName, params)
+        .setMaxTransactionFee(new Hbar(2)) // Set an appropriate max transaction fee
+        .freezeWith(client)
+
+    // Sign and execute the transaction
+    const contractExecuteSign = await contractExecuteTx.sign(operator.key);
+    const contractExecuteSubmit = await contractExecuteSign.execute(client);
+
+    console.log(` - Contract Execute ${functionName} with transaction ${contractExecuteSubmit.transactionId.toString()}`);
+
+    return { 
+      receipt: await contractExecuteSubmit.getReceipt(client),
+      record : await contractExecuteSubmit.getRecord(client),
+    }
+
+  }
+
+  async queryContract(client: Client, contractId: ContractId, functionName: string, params: ContractFunctionParameters) {
+    const query = new ContractCallQuery()
+        .setContractId(contractId)
+        .setGas(100000) // Adjust gas limit as needed
+        .setFunction(functionName, params);
+
+    return await query.execute(client);
+  }
+
+  async queryAccountBalance(client: Client, accountId: AccountId) {
+    const balanceQuery = new AccountBalanceQuery()
+        .setAccountId(accountId);
+
+    const accountBalance = await balanceQuery.execute(client);
+    return accountBalance;
+  }
+
+  async queryTokenBalance(client: Client, accountId: AccountId, tokenId: TokenId) {
+      const accountBalance = await this.queryAccountBalance(client, accountId);
+      const tokenBalance = accountBalance?.tokens?.get(tokenId);
+      return tokenBalance;
+  }
+
+  async queryAccountInfo(ownerAccountId: AccountId | ContractId) {
+    const mirrorNodeUrl = process.env.MIRROR_NODE_URL || "https://testnet.mirrornode.hedera.com"; // Use appropriate mirror node URL
+
+    try {
+        const response = await axios.get(`${mirrorNodeUrl}/api/v1/accounts/${ownerAccountId.toString()}`);
+        return response.data;       
+    } catch (error) {
+        console.error(`Error querying allowance: ${error}`);
+    }
+  }
+
+  async queryTokenInfo(tokenId: TokenId | string) {
+    const mirrorNodeUrl = process.env.MIRROR_NODE_URL || "https://testnet.mirrornode.hedera.com"; // Use appropriate mirror node URL
+
+    try {
+        const response = await axios.get(`${mirrorNodeUrl}/api/v1/tokens/${tokenId.toString()}`);
+        return response.data;       
+    } catch (error) {
+        console.error(`Error querying allowance: ${error}`);
+    }
+  }
+}
+
+export default new Utils();
diff --git a/yarn.lock b/yarn.lock
index 920ee42..e924b16 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1189,6 +1189,13 @@
   dependencies:
     fs-extra "^9.1.0"
 
+"@types/bn.js@*", "@types/bn.js@^5.1.0":
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-5.1.5.tgz#2e0dacdcce2c0f16b905d20ff87aedbc6f7b4bf0"
+  integrity sha512-V46N0zwKRF5Q00AZ6hWtN0T8gGmDUaUzLWQvHFo5yThtVwK/VCenFY3wXVbOvNfajEpsTfQM4IN9k/d6gUVX3A==
+  dependencies:
+    "@types/node" "*"
+
 "@types/bn.js@^4.11.3":
   version "4.11.6"
   resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-4.11.6.tgz#c306c70d9358aaea33cd4eda092a742b9505967c"
@@ -1196,13 +1203,6 @@
   dependencies:
     "@types/node" "*"
 
-"@types/bn.js@^5.1.0":
-  version "5.1.5"
-  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-5.1.5.tgz#2e0dacdcce2c0f16b905d20ff87aedbc6f7b4bf0"
-  integrity sha512-V46N0zwKRF5Q00AZ6hWtN0T8gGmDUaUzLWQvHFo5yThtVwK/VCenFY3wXVbOvNfajEpsTfQM4IN9k/d6gUVX3A==
-  dependencies:
-    "@types/node" "*"
-
 "@types/chai-as-promised@^7.1.3":
   version "7.1.8"
   resolved "https://registry.yarnpkg.com/@types/chai-as-promised/-/chai-as-promised-7.1.8.tgz#f2b3d82d53c59626b5d6bbc087667ccb4b677fe9"
@@ -1227,6 +1227,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/elliptic@^6.4.18":
+  version "6.4.18"
+  resolved "https://registry.yarnpkg.com/@types/elliptic/-/elliptic-6.4.18.tgz#bc96e26e1ccccbabe8b6f0e409c85898635482e1"
+  integrity sha512-UseG6H5vjRiNpQvrhy4VF/JXdA3V/Fp5amvveaL+fs28BZ6xIKJBPnUPRlEaZpysD9MbpfaLi8lbl7PGUAkpWw==
+  dependencies:
+    "@types/bn.js" "*"
+
 "@types/form-data@0.0.33":
   version "0.0.33"
   resolved "https://registry.yarnpkg.com/@types/form-data/-/form-data-0.0.33.tgz#c9ac85b2a5fd18435b8c85d9ecb50e6d6c893ff8"
@@ -2607,7 +2614,7 @@ elliptic@6.5.4:
     minimalistic-assert "^1.0.1"
     minimalistic-crypto-utils "^1.0.1"
 
-elliptic@^6.5.2, elliptic@^6.5.4:
+elliptic@^6.5.2, elliptic@^6.5.4, elliptic@^6.5.5:
   version "6.5.5"
   resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.5.tgz#c715e09f78b6923977610d4c2346d6ce22e6dded"
   integrity sha512-7EjbcmUm17NQFu4Pmgmq2olYMj8nwMnpcddByChSUjArp8F5DQWcIcpriwO4ZToLNAJig0yiyjswfyGNje/ixw==