diff --git a/contracts/orderbook/hts/ExchangeHTS.sol b/contracts/orderbook/hts/ExchangeHTS.sol
index 38cf0ca..d3e0a3b 100644
--- a/contracts/orderbook/hts/ExchangeHTS.sol
+++ b/contracts/orderbook/hts/ExchangeHTS.sol
@@ -38,7 +38,7 @@ contract ExchangeHTS is OrderBookHTS, ReentrancyGuard {
             _insertBuyOrder(msg.sender, price, remainVolume);
         }
 
-        return 0;
+        return currentOrderId;
     }
 
     /**
diff --git a/contracts/orderbook/hts/OrderBookHTS.sol b/contracts/orderbook/hts/OrderBookHTS.sol
index ea06415..603af9b 100644
--- a/contracts/orderbook/hts/OrderBookHTS.sol
+++ b/contracts/orderbook/hts/OrderBookHTS.sol
@@ -17,9 +17,9 @@ abstract contract OrderBookHTS {
 
     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 indexed trader, address token, int64 amount);
+    event Deposit(address trader, address token, int64 amount);
     event Withdraw(address trader, address token, int64 amount);
-    event OrderCanceled(bool isBuy, uint256 indexed orderId, address indexed trader);
+    event OrderCanceled(bool isBuy, uint256 orderId, address trader);
 
     struct Order {
         uint256 id;
@@ -93,8 +93,10 @@ abstract contract OrderBookHTS {
         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) {
+        while (currentBuyId != 0 && sellVolume > 0 && iterations < maxIterations) {
             Order storage buyOrder = buyOrders[currentBuyId];
 
             if (sellPrice <= buyOrder.price) {
@@ -118,6 +120,7 @@ abstract contract OrderBookHTS {
             } else {
                 break;
             }
+            iterations++;
         }
 
         firstBuyOrderId = currentBuyId;  // Update the first buy order ID
@@ -130,8 +133,10 @@ abstract contract OrderBookHTS {
         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) {
+        while (currentSellId != 0 && buyVolume > 0 && iterations < maxIterations) {
             Order storage sellOrder = sellOrders[currentSellId];
 
             if (buyPrice >= sellOrder.price) {
@@ -155,6 +160,7 @@ abstract contract OrderBookHTS {
             } else {
                 break;
             }
+            iterations++;
         }
 
         firstSellOrderId = currentSellId;  // Update the first sell order ID
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
index b724cd4..cd56238 100644
--- a/data/abis/ExchangeHTS.json
+++ b/data/abis/ExchangeHTS.json
@@ -28,7 +28,7 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": true,
+          "indexed": false,
           "internalType": "address",
           "name": "trader",
           "type": "address"
@@ -96,13 +96,13 @@
           "type": "bool"
         },
         {
-          "indexed": true,
+          "indexed": false,
           "internalType": "uint256",
           "name": "orderId",
           "type": "uint256"
         },
         {
-          "indexed": true,
+          "indexed": false,
           "internalType": "address",
           "name": "trader",
           "type": "address"
@@ -437,8 +437,8 @@
       "type": "function"
     }
   ],
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"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   "linkReferences": {},
   "deployedLinkReferences": {}
 }
diff --git a/data/abis/OrderBookHTS.json b/data/abis/OrderBookHTS.json
index 7b0292b..df8ec2a 100644
--- a/data/abis/OrderBookHTS.json
+++ b/data/abis/OrderBookHTS.json
@@ -7,7 +7,7 @@
       "anonymous": false,
       "inputs": [
         {
-          "indexed": true,
+          "indexed": false,
           "internalType": "address",
           "name": "trader",
           "type": "address"
@@ -75,13 +75,13 @@
           "type": "bool"
         },
         {
-          "indexed": true,
+          "indexed": false,
           "internalType": "uint256",
           "name": "orderId",
           "type": "uint256"
         },
         {
-          "indexed": true,
+          "indexed": false,
           "internalType": "address",
           "name": "trader",
           "type": "address"
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/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
index 3a7dade..c8b0f7e 100644
--- a/test/utils.ts
+++ b/test/utils.ts
@@ -24,7 +24,7 @@ import {
   FileId,
   ContractCallQuery,
   AccountBalanceQuery,
-  TransactionRecord
+  TransactionRecord,
 } from '@hashgraph/sdk';
 import axios from 'axios';
 
@@ -35,6 +35,28 @@ export interface Operator {
 }
 
 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()
@@ -165,7 +187,14 @@ class Utils {
       .freezeWith(client);
 
     const associateSign = await associateTx.sign(account.key); // Use the recipient's private key
-    await associateSign.execute(client);
+    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) {
@@ -175,8 +204,8 @@ class Utils {
     );
 
     const transferTx = new TransferTransaction()
-      .addTokenTransfer(tokenId, from.accountId, -amount)
-      .addTokenTransfer(tokenId, to, amount)  
+      .addTokenTransfer(tokenId, from.accountId, amount * -1)
+      .addTokenTransfer(tokenId, to, amount * 1)  
       .freezeWith(client);
 
       const transferSign = await transferTx.sign(from.key);
@@ -218,10 +247,10 @@ class Utils {
     console.log(`- AccountAllowanceApproveTransaction success with id: ${tx.transactionId}`)
   }
 
-  async executeContract(client: Client, operator: Operator, contract: ContractId | string, functionName: string, params: ContractFunctionParameters): Promise<{ receipt: TransactionReceipt, record : TransactionRecord }> {
+  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(1000000) // Adjust based on the complexity of your function
+        .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)
@@ -230,7 +259,7 @@ class Utils {
     const contractExecuteSign = await contractExecuteTx.sign(operator.key);
     const contractExecuteSubmit = await contractExecuteSign.execute(client);
 
-    console.log(` - Contract Execute with transaction ${contractExecuteSubmit.transactionId.toString()}`);
+    console.log(` - Contract Execute ${functionName} with transaction ${contractExecuteSubmit.transactionId.toString()}`);
 
     return { 
       receipt: await contractExecuteSubmit.getReceipt(client),
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==