diff --git a/contracts/ExchangeRateFactory.sol b/contracts/ExchangeRateFactory.sol
deleted file mode 100644
index 98bbbd2..0000000
--- a/contracts/ExchangeRateFactory.sol
+++ /dev/null
@@ -1,27 +0,0 @@
-pragma solidity 0.4.24;
-
-import "./ExchangeRateSource.sol";
-
-
-/**
- * @title Exchange rate factory contract
- * @notice https://www.fragments.org/protocol/
- *
- * @dev A factory which creates exchange rate source contracts.
- */
-contract ExchangeRateFactory {
-    event SourceCreated(address owner, string name, ExchangeRateSource source);
-
-    /**
-     * @dev Any ethereum user can call this function create an ExchangeRateSource,
-     * which they could use to report exchange rates.
-     * @param name a human readable identifier for the source.
-     * @return The address of the created ExchangeRateSource contract.
-     */
-    function createSource(string name) public returns (ExchangeRateSource) {
-        ExchangeRateSource source = new ExchangeRateSource(name);
-        emit SourceCreated(msg.sender, name, source);
-        source.transferOwnership(msg.sender);
-        return source;
-    }
-}
diff --git a/contracts/ExchangeRateAggregator.sol b/contracts/MarketOracle.sol
similarity index 63%
rename from contracts/ExchangeRateAggregator.sol
rename to contracts/MarketOracle.sol
index 6a57be8..c3f4ed7 100644
--- a/contracts/ExchangeRateAggregator.sol
+++ b/contracts/MarketOracle.sol
@@ -3,39 +3,37 @@ pragma solidity 0.4.24;
 import "openzeppelin-solidity/contracts/math/SafeMath.sol";
 import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
 
-import "./ExchangeRateSource.sol";
+import "./MarketSource.sol";
 
 
 /**
- * @title Exchange rate aggregator contract
+ * @title Market Oracle
  * @notice https://www.fragments.org/protocol/
  *
- * @dev The aggregator contract maintains a public whitelist of valid exchange rate sources
- * Only the contract owner can add/remove sources from this whitelist.
- * The aggregated exchange rate is computed as the volume weighted average of valid
- * exchange rates from whitelisted sources.
+ * @dev This oracle provides price and volume data onchain via a whitelist of sources. The exchange
+        rate is computed as a volume weighted average of valid exchange rates.
  */
-contract ExchangeRateAggregator is Ownable {
+contract MarketOracle is Ownable {
     using SafeMath for uint256;
 
-    // The maximum number of sources which can be added
+    // Maximum number of whitelisted sources
     uint8 public constant MAX_SOURCES = 255;
 
-    // It signifies the number of decimal places in the aggregated exchange rate returned by this aggregator
+    // Number of decimal places in the exchange rate provided by this oracle.
     uint8 public constant DECIMALS = 18;
 
     // Whitelist of sources
-    ExchangeRateSource[] public whitelist;
+    MarketSource[] public whitelist;
 
-    event SourceAdded(ExchangeRateSource source);
-    event SourceRemoved(ExchangeRateSource source);
-    event SourceExpired(ExchangeRateSource source);
+    event SourceAdded(MarketSource source);
+    event SourceRemoved(MarketSource source);
+    event SourceExpired(MarketSource source);
 
     /**
-     * @dev Adds source to whitelist
-     * @param source Reference to the ExchangeRateSource contract which is to be added.
+     * @dev Adds a source to the whitelist
+     * @param source Reference to the MarketSource contract which is to be added.
      */
-    function addSource(ExchangeRateSource source) public onlyOwner {
+    function addSource(MarketSource source) public onlyOwner {
         require(whitelist.length < MAX_SOURCES);
         require(source.DECIMALS() == DECIMALS);
         whitelist.push(source);
@@ -44,9 +42,9 @@ contract ExchangeRateAggregator is Ownable {
 
     /**
      * @dev Performs a linear scan and removes the provided source from whitelist
-     * @param source Reference to the ExchangeRateSource contract which is to be removed.
+     * @param source Reference to the MarketSource contract which is to be removed.
      */
-    function removeSource(ExchangeRateSource source) public onlyOwner {
+    function removeSource(MarketSource source) public onlyOwner {
         for (uint8 i = 0; i < whitelist.length; i++) {
             if (whitelist[i] == source) {
                 removeSource(i);
@@ -55,10 +53,10 @@ contract ExchangeRateAggregator is Ownable {
     }
 
     /**
-     * @dev Computes the volume weighted average of valid exchange rates from whitelisted sources and
-     * the total trade volume.
+     * @return The volume weighted average of valid exchange rates from whitelisted sources and
+     *         the total trade volume.
      */
-    function aggregate() public view returns (uint256, uint256) {
+    function getPriceAndVolume() public view returns (uint256, uint256) {
         uint256 volumeWeightedSum = 0;
         uint256 volume = 0;
         for (uint8 i = 0; i < whitelist.length; i++) {
@@ -76,7 +74,7 @@ contract ExchangeRateAggregator is Ownable {
     }
 
     /**
-     * @dev Performs a linear scan on the whitelisted sources and removes dead sources
+     * @dev Performs a linear scan on the whitelisted sources and removes any dead sources
      */
     function removeDeadSources() public {
         for (uint8 i = 0; i < whitelist.length; i++) {
diff --git a/contracts/ExchangeRateSource.sol b/contracts/MarketSource.sol
similarity index 89%
rename from contracts/ExchangeRateSource.sol
rename to contracts/MarketSource.sol
index b15c56b..220f8d5 100644
--- a/contracts/ExchangeRateSource.sol
+++ b/contracts/MarketSource.sol
@@ -5,13 +5,13 @@ import "openzeppelin-solidity/contracts/math/SafeMath.sol";
 
 
 /**
- * @title Exchange rate source contract
+ * @title Market Source
  * @notice https://www.fragments.org/protocol/
  *
- * @dev This contract interacts with off chain exchange rate providers and records
- * the latest fragments to USD exchange rates onto the blockchain.
+ * @dev This contract provides the USD-UFragments exchange rate and volume from a single offchain
+ *      market source.
  */
-contract ExchangeRateSource is Destructible {
+contract MarketSource is Destructible {
     using SafeMath for uint256;
 
     // It signifies the number of decimal places in the reported exchange rate
diff --git a/contracts/MarketSourceFactory.sol b/contracts/MarketSourceFactory.sol
new file mode 100644
index 0000000..a11e069
--- /dev/null
+++ b/contracts/MarketSourceFactory.sol
@@ -0,0 +1,27 @@
+pragma solidity 0.4.24;
+
+import "./MarketSource.sol";
+
+
+/**
+ * @title Market Source Factory
+ * @notice https://www.fragments.org/protocol/
+ *
+ * @dev A factory which spawns MarketSource contracts.
+ */
+contract MarketSourceFactory {
+    event SourceCreated(address owner, string name, MarketSource source);
+
+    /**
+     * @dev Any user may call this function to create a MarketSource,
+     *      which can be used to report market data.
+     * @param name a human readable identifier for the source.
+     * @return The address of the created MarketSource contract.
+     */
+    function createSource(string name) public returns (MarketSource) {
+        MarketSource source = new MarketSource(name);
+        emit SourceCreated(msg.sender, name, source);
+        source.transferOwnership(msg.sender);
+        return source;
+    }
+}
diff --git a/migrations/2_deploy_contracts.js b/migrations/2_deploy_contracts.js
index 916c226..2a902e0 100644
--- a/migrations/2_deploy_contracts.js
+++ b/migrations/2_deploy_contracts.js
@@ -1,5 +1,5 @@
-const ExchangeRateFactory = artifacts.require('ExchangeRateFactory.sol');
-const ExchangeRateAggregator = artifacts.require('ExchangeRateAggregator.sol');
+const MarketSourceFactory = artifacts.require('MarketSourceFactory.sol');
+const MarketOracle = artifacts.require('MarketOracle.sol');
 
 const APP_ROOT_PATH = require('app-root-path');
 const _require = APP_ROOT_PATH.require;
@@ -15,8 +15,8 @@ module.exports = function (deployer, network, accounts) {
 
   async function deployFragmentsContracts (deployer) {
     deployer.logger.log('Deploying core contracts');
-    await deployer.deploy(ExchangeRateFactory, deploymentConfig);
-    await deployer.deploy(ExchangeRateAggregator, deploymentConfig);
+    await deployer.deploy(MarketSourceFactory, deploymentConfig);
+    await deployer.deploy(MarketOracle, deploymentConfig);
   }
 
   async function saveDeploymentData () {
@@ -26,10 +26,10 @@ module.exports = function (deployer, network, accounts) {
       rpcHttpClient: `http://${config.host}:${config.port}`,
       rpcWsClient: `ws://${config.host}:${config.wsPort}`,
       deployer: deployerAccount,
-      exchangeRateAggregator: ExchangeRateAggregator.address,
-      exchangeRateAggregatorTx: ExchangeRateAggregator.transactionHash,
-      exchangeRateFactory: ExchangeRateFactory.address,
-      exchangeRateFactoryTx: ExchangeRateFactory.transactionHash
+      MarketOracle: MarketOracle.address,
+      MarketOracleTx: MarketOracle.transactionHash,
+      MarketSourceFactory: MarketSourceFactory.address,
+      MarketSourceFactoryTx: MarketSourceFactory.transactionHash
     }, `${APP_ROOT_PATH}/migrations/deployments/${config.ref}.yaml`);
   }
 
diff --git a/package-lock.json b/package-lock.json
index 9407c08..c1857fc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,8 +9,8 @@
       "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
       "integrity": "sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==",
       "requires": {
-        "call-me-maybe": "^1.0.1",
-        "glob-to-regexp": "^0.3.0"
+        "call-me-maybe": "1.0.1",
+        "glob-to-regexp": "0.3.0"
       }
     },
     "@nodelib/fs.stat": {
@@ -23,7 +23,7 @@
       "resolved": "https://registry.npmjs.org/@samverschueren/stream-to-observable/-/stream-to-observable-0.3.0.tgz",
       "integrity": "sha512-MI4Xx6LHs4Webyvi6EbspgyAb4D2Q2VtnCQ1blOJcoLS6mVa8lNN2rkIy1CVxfTUpoyIbCTkXES1rLXztFD1lg==",
       "requires": {
-        "any-observable": "^0.3.0"
+        "any-observable": "0.3.0"
       }
     },
     "@sindresorhus/is": {
@@ -49,8 +49,8 @@
         "@webassemblyjs/helper-module-context": "1.5.9",
         "@webassemblyjs/helper-wasm-bytecode": "1.5.9",
         "@webassemblyjs/wast-parser": "1.5.9",
-        "debug": "^3.1.0",
-        "mamacro": "^0.0.3"
+        "debug": "3.1.0",
+        "mamacro": "0.0.3"
       },
       "dependencies": {
         "debug": {
@@ -82,7 +82,7 @@
       "integrity": "sha512-WYkys6y33viEY23tHJ+KkSd9yHZBd54Sy6gcSgwLGPP1or9pLqWBrjWWATHuDuIkpvSJSt/+3qjAV6zHd1nS0g==",
       "dev": true,
       "requires": {
-        "debug": "^3.1.0"
+        "debug": "3.1.0"
       },
       "dependencies": {
         "debug": {
@@ -133,7 +133,7 @@
         "@webassemblyjs/helper-buffer": "1.5.9",
         "@webassemblyjs/helper-wasm-bytecode": "1.5.9",
         "@webassemblyjs/wasm-gen": "1.5.9",
-        "debug": "^3.1.0"
+        "debug": "3.1.0"
       },
       "dependencies": {
         "debug": {
@@ -153,7 +153,7 @@
       "integrity": "sha512-mhetZBDnpV3VYqZb5Aail9X01VyIqDDZrNYdYj8bfx/PsVPG2znX90wRyVNTeqC5ylqHCgGkJ63bPaPEyINfsw==",
       "dev": true,
       "requires": {
-        "ieee754": "^1.1.11"
+        "ieee754": "1.1.11"
       }
     },
     "@webassemblyjs/leb128": {
@@ -162,7 +162,7 @@
       "integrity": "sha512-oZ3eUB9EViUtiuMwW/xeYamXgfFS2cmXl6aUIYBfpXJQ5v5aOC8ZuPpz2/LqlgNlT8ThpyFd6kfgkYVwKwkGvQ==",
       "dev": true,
       "requires": {
-        "leb": "^0.3.0"
+        "leb": "0.3.0"
       }
     },
     "@webassemblyjs/wasm-edit": {
@@ -179,7 +179,7 @@
         "@webassemblyjs/wasm-opt": "1.5.9",
         "@webassemblyjs/wasm-parser": "1.5.9",
         "@webassemblyjs/wast-printer": "1.5.9",
-        "debug": "^3.1.0"
+        "debug": "3.1.0"
       },
       "dependencies": {
         "debug": {
@@ -215,7 +215,7 @@
         "@webassemblyjs/helper-buffer": "1.5.9",
         "@webassemblyjs/wasm-gen": "1.5.9",
         "@webassemblyjs/wasm-parser": "1.5.9",
-        "debug": "^3.1.0"
+        "debug": "3.1.0"
       },
       "dependencies": {
         "debug": {
@@ -254,8 +254,8 @@
         "@webassemblyjs/helper-api-error": "1.5.9",
         "@webassemblyjs/helper-code-frame": "1.5.9",
         "@webassemblyjs/helper-fsm": "1.5.9",
-        "long": "^3.2.0",
-        "mamacro": "^0.0.3"
+        "long": "3.2.0",
+        "mamacro": "0.0.3"
       }
     },
     "@webassemblyjs/wast-printer": {
@@ -266,7 +266,7 @@
       "requires": {
         "@webassemblyjs/ast": "1.5.9",
         "@webassemblyjs/wast-parser": "1.5.9",
-        "long": "^3.2.0"
+        "long": "3.2.0"
       }
     },
     "acorn": {
@@ -281,7 +281,7 @@
       "integrity": "sha512-zVWV8Z8lislJoOKKqdNMOB+s6+XV5WERty8MnKBeFgwA+19XJjJHs2RP5dzM57FftIs+jQnRToLiWazKr6sSWg==",
       "dev": true,
       "requires": {
-        "acorn": "^5.0.0"
+        "acorn": "5.6.0"
       }
     },
     "acorn-jsx": {
@@ -290,7 +290,7 @@
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
       "requires": {
-        "acorn": "^3.0.4"
+        "acorn": "3.3.0"
       },
       "dependencies": {
         "acorn": {
@@ -307,10 +307,10 @@
       "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "dev": true,
       "requires": {
-        "co": "^4.6.0",
-        "fast-deep-equal": "^1.0.0",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.3.0"
+        "co": "4.6.0",
+        "fast-deep-equal": "1.1.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
       }
     },
     "ajv-keywords": {
@@ -334,7 +334,7 @@
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
       "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
       "requires": {
-        "color-convert": "^1.9.0"
+        "color-convert": "1.9.1"
       }
     },
     "antlr4": {
@@ -354,8 +354,8 @@
       "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
       "dev": true,
       "requires": {
-        "micromatch": "^3.1.4",
-        "normalize-path": "^2.1.1"
+        "micromatch": "3.1.10",
+        "normalize-path": "2.1.1"
       },
       "dependencies": {
         "arr-diff": {
@@ -376,16 +376,16 @@
           "integrity": "sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==",
           "dev": true,
           "requires": {
-            "arr-flatten": "^1.1.0",
-            "array-unique": "^0.3.2",
-            "extend-shallow": "^2.0.1",
-            "fill-range": "^4.0.0",
-            "isobject": "^3.0.1",
-            "repeat-element": "^1.1.2",
-            "snapdragon": "^0.8.1",
-            "snapdragon-node": "^2.0.1",
-            "split-string": "^3.0.2",
-            "to-regex": "^3.0.1"
+            "arr-flatten": "1.1.0",
+            "array-unique": "0.3.2",
+            "extend-shallow": "2.0.1",
+            "fill-range": "4.0.0",
+            "isobject": "3.0.1",
+            "repeat-element": "1.1.2",
+            "snapdragon": "0.8.2",
+            "snapdragon-node": "2.1.1",
+            "split-string": "3.1.0",
+            "to-regex": "3.0.2"
           },
           "dependencies": {
             "extend-shallow": {
@@ -394,7 +394,7 @@
               "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
               "dev": true,
               "requires": {
-                "is-extendable": "^0.1.0"
+                "is-extendable": "0.1.1"
               }
             }
           }
@@ -405,13 +405,13 @@
           "integrity": "sha1-t3c14xXOMPa27/D4OwQVGiJEliI=",
           "dev": true,
           "requires": {
-            "debug": "^2.3.3",
-            "define-property": "^0.2.5",
-            "extend-shallow": "^2.0.1",
-            "posix-character-classes": "^0.1.0",
-            "regex-not": "^1.0.0",
-            "snapdragon": "^0.8.1",
-            "to-regex": "^3.0.1"
+            "debug": "2.6.9",
+            "define-property": "0.2.5",
+            "extend-shallow": "2.0.1",
+            "posix-character-classes": "0.1.1",
+            "regex-not": "1.0.2",
+            "snapdragon": "0.8.2",
+            "to-regex": "3.0.2"
           },
           "dependencies": {
             "define-property": {
@@ -420,7 +420,7 @@
               "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
               "dev": true,
               "requires": {
-                "is-descriptor": "^0.1.0"
+                "is-descriptor": "0.1.6"
               }
             },
             "extend-shallow": {
@@ -429,7 +429,7 @@
               "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
               "dev": true,
               "requires": {
-                "is-extendable": "^0.1.0"
+                "is-extendable": "0.1.1"
               }
             },
             "is-accessor-descriptor": {
@@ -438,7 +438,7 @@
               "integrity": "sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=",
               "dev": true,
               "requires": {
-                "kind-of": "^3.0.2"
+                "kind-of": "3.2.2"
               },
               "dependencies": {
                 "kind-of": {
@@ -447,7 +447,7 @@
                   "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
                   "dev": true,
                   "requires": {
-                    "is-buffer": "^1.1.5"
+                    "is-buffer": "1.1.6"
                   }
                 }
               }
@@ -458,7 +458,7 @@
               "integrity": "sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=",
               "dev": true,
               "requires": {
-                "kind-of": "^3.0.2"
+                "kind-of": "3.2.2"
               },
               "dependencies": {
                 "kind-of": {
@@ -467,7 +467,7 @@
                   "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
                   "dev": true,
                   "requires": {
-                    "is-buffer": "^1.1.5"
+                    "is-buffer": "1.1.6"
                   }
                 }
               }
@@ -478,9 +478,9 @@
               "integrity": "sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==",
               "dev": true,
               "requires": {
-                "is-accessor-descriptor": "^0.1.6",
-                "is-data-descriptor": "^0.1.4",
-                "kind-of": "^5.0.0"
+                "is-accessor-descriptor": "0.1.6",
+                "is-data-descriptor": "0.1.4",
+                "kind-of": "5.1.0"
               }
             },
             "kind-of": {
@@ -497,14 +497,14 @@
           "integrity": "sha512-Nmb6QXkELsuBr24CJSkilo6UHHgbekK5UiZgfE6UHD3Eb27YC6oD+bhcT+tJ6cl8dmsgdQxnWlcry8ksBIBLpw==",
           "dev": true,
           "requires": {
-            "array-unique": "^0.3.2",
-            "define-property": "^1.0.0",
-            "expand-brackets": "^2.1.4",
-            "extend-shallow": "^2.0.1",
-            "fragment-cache": "^0.2.1",
-            "regex-not": "^1.0.0",
-            "snapdragon": "^0.8.1",
-            "to-regex": "^3.0.1"
+            "array-unique": "0.3.2",
+            "define-property": "1.0.0",
+            "expand-brackets": "2.1.4",
+            "extend-shallow": "2.0.1",
+            "fragment-cache": "0.2.1",
+            "regex-not": "1.0.2",
+            "snapdragon": "0.8.2",
+            "to-regex": "3.0.2"
           },
           "dependencies": {
             "define-property": {
@@ -513,7 +513,7 @@
               "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
               "dev": true,
               "requires": {
-                "is-descriptor": "^1.0.0"
+                "is-descriptor": "1.0.2"
               }
             },
             "extend-shallow": {
@@ -522,7 +522,7 @@
               "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
               "dev": true,
               "requires": {
-                "is-extendable": "^0.1.0"
+                "is-extendable": "0.1.1"
               }
             }
           }
@@ -533,10 +533,10 @@
           "integrity": "sha1-1USBHUKPmOsGpj3EAtJAPDKMOPc=",
           "dev": true,
           "requires": {
-            "extend-shallow": "^2.0.1",
-            "is-number": "^3.0.0",
-            "repeat-string": "^1.6.1",
-            "to-regex-range": "^2.1.0"
+            "extend-shallow": "2.0.1",
+            "is-number": "3.0.0",
+            "repeat-string": "1.6.1",
+            "to-regex-range": "2.1.1"
           },
           "dependencies": {
             "extend-shallow": {
@@ -545,7 +545,7 @@
               "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
               "dev": true,
               "requires": {
-                "is-extendable": "^0.1.0"
+                "is-extendable": "0.1.1"
               }
             }
           }
@@ -556,7 +556,7 @@
           "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
           "dev": true,
           "requires": {
-            "kind-of": "^6.0.0"
+            "kind-of": "6.0.2"
           }
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@@ -9511,7 +9509,7 @@
           "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.2.tgz",
           "integrity": "sha512-lreewLK/BlghmxtfH36YYVg1i8IAce4TI7oao75I1g245+6BctqTVQiBP3YUJ9C6DQOXJmkYR9X9fCLtCOJc5w==",
           "requires": {
-            "glob": "^7.0.5"
+            "glob": "7.1.2"
           }
         }
       }
diff --git a/test/load/gas_utilization.js b/test/load/gas_utilization.js
index bbb5b28..fadc7f7 100644
--- a/test/load/gas_utilization.js
+++ b/test/load/gas_utilization.js
@@ -5,9 +5,9 @@
   npm run truffle exec test/load/gas_utilization.js verify
     => Verifies if the gas amounts in logs/gas-utilization.yaml is consistent with the computed values
 */
-const ExchangeRateAggregator = artifacts.require('ExchangeRateAggregator.sol');
-const ExchangeRateFactory = artifacts.require('ExchangeRateFactory.sol');
-const ExchangeRateSource = artifacts.require('ExchangeRateSource.sol');
+const MarketOracle = artifacts.require('MarketOracle.sol');
+const MarketSourceFactory = artifacts.require('MarketSourceFactory.sol');
+const MarketSource = artifacts.require('MarketSource.sol');
 
 const yaml = require('js-yaml');
 const fs = require('fs');
@@ -62,8 +62,8 @@ async function computeGasUtilization () {
   const accounts = await chain.getUserAccounts();
   const deployer = accounts[0];
 
-  const exchangeRateFactory = ExchangeRateFactory.at(chainConfig.exchangeRateFactory);
-  const exchangeRateAggregator = ExchangeRateAggregator.at(chainConfig.exchangeRateAggregator);
+  const marketSourceFactory = MarketSourceFactory.at(chainConfig.MarketSourceFactory);
+  const marketOracle = MarketOracle.at(chainConfig.MarketOracle);
 
   const callerConfig = {
     from: deployer,
@@ -78,20 +78,20 @@ async function computeGasUtilization () {
   console.log('CONTRACT DEPLOYMENT GAS UTILIZATION');
   console.log('-----------------------------------------------------');
 
-  await cleanRoomTx('ExchangeRateFactory:DEPLOYMENT', () => chainConfig.exchangeRateFactoryTx);
+  await cleanRoomTx('MarketSourceFactory:DEPLOYMENT', () => chainConfig.MarketSourceFactoryTx);
   console.log('-----------------------------------------------------');
 
-  await cleanRoomTx('ExchangeRateAggregator:DEPLOYMENT', () => chainConfig.exchangeRateAggregatorTx);
+  await cleanRoomTx('MarketOracle:DEPLOYMENT', () => chainConfig.MarketOracleTx);
   console.log('**************************************************************');
 
-  await cleanRoomTx('ExchangeRateAggregator:aggregate(10 sources)', async () => {
+  await cleanRoomTx('MarketOracle:getPriceAndVolume(10 sources)', async () => {
     for (let i = 0; i < 10; i++) {
-      const r = await exchangeRateFactory.createSource('GDAX' + toString(i), callerConfig);
-      const s = ExchangeRateSource.at(r.logs[0].args.source);
-      exchangeRateAggregator.addSource(s.address);
+      const r = await marketSourceFactory.createSource('GDAX' + toString(i), callerConfig);
+      const s = MarketSource.at(r.logs[0].args.source);
+      marketOracle.addSource(s.address);
       await s.reportRate(1050000000000000000, 1, callerConfig);
     }
-    return exchangeRateAggregator.aggregate.sendTransaction(callerConfig);
+    return marketOracle.getPriceAndVolume.sendTransaction(callerConfig);
   });
   console.log('-----------------------------------------------------');
 }
diff --git a/test/logs/gas-utilization.yaml b/test/logs/gas-utilization.yaml
index ab0f766..94025e8 100644
--- a/test/logs/gas-utilization.yaml
+++ b/test/logs/gas-utilization.yaml
@@ -1,5 +1,5 @@
 # Code generated - DO NOT EDIT.
 # Any manual changes may be lost.
-'ExchangeRateFactory:DEPLOYMENT': 924365
-'ExchangeRateAggregator:DEPLOYMENT': 1096207
-'ExchangeRateAggregator:aggregate(10 sources)': 137479
+'MarketSourceFactory:DEPLOYMENT': 924365
+'MarketOracle:DEPLOYMENT': 1096271
+'MarketOracle:getPriceAndVolume(10 sources)': 137325
diff --git a/test/unit/exchange_rate_aggregator.js b/test/unit/market_oracle.js
similarity index 67%
rename from test/unit/exchange_rate_aggregator.js
rename to test/unit/market_oracle.js
index e4a4b54..87e2ae4 100644
--- a/test/unit/exchange_rate_aggregator.js
+++ b/test/unit/market_oracle.js
@@ -1,24 +1,24 @@
-const ExchangeRateAggregator = artifacts.require('ExchangeRateAggregator.sol');
-const ExchangeRateFactory = artifacts.require('ExchangeRateFactory.sol');
-const ExchangeRateSource = artifacts.require('ExchangeRateSource.sol');
+const MarketOracle = artifacts.require('MarketOracle.sol');
+const MarketSourceFactory = artifacts.require('MarketSourceFactory.sol');
+const MarketSource = artifacts.require('MarketSource.sol');
 
 const _require = require('app-root-path').require;
 const { ContractEventSpy } = _require('/util/spies');
 const BlockchainCaller = _require('/util/blockchain_caller');
 const chain = new BlockchainCaller(web3);
 
-contract('ExchangeRateAggregator', async accounts => {
-  let factory, aggregator, s1, s2, r;
+contract('MarketOracle', async accounts => {
+  let factory, oracle, s1, s2, r;
   const A = accounts[1];
   const B = accounts[2];
 
   before(async function () {
-    factory = await ExchangeRateFactory.deployed();
-    aggregator = await ExchangeRateAggregator.deployed();
+    factory = await MarketSourceFactory.deployed();
+    oracle = await MarketOracle.deployed();
     r = await factory.createSource('GDAX', {from: A});
-    s1 = ExchangeRateSource.at(r.logs[0].args.source);
+    s1 = MarketSource.at(r.logs[0].args.source);
     r = await factory.createSource('Binance', {from: B});
-    s2 = ExchangeRateSource.at(r.logs[0].args.source);
+    s2 = MarketSource.at(r.logs[0].args.source);
   });
 
   describe('addSource', () => {
@@ -27,10 +27,10 @@ contract('ExchangeRateAggregator', async accounts => {
       before(async () => {
         snapshot = await chain.snapshotChain();
         sourceAddSpy = new ContractEventSpy([
-          aggregator.SourceAdded
+          oracle.SourceAdded
         ]);
         sourceAddSpy.watch();
-        await aggregator.addSource(s1.address);
+        await oracle.addSource(s1.address);
       });
       after(async () => {
         sourceAddSpy.stopWatching();
@@ -43,7 +43,7 @@ contract('ExchangeRateAggregator', async accounts => {
         expect(addedEvent.args.source).to.eq(s1.address);
       });
       it('should add s1 to the whitelist', async () => {
-        expect(await aggregator.whitelist.call(0)).to.eq(s1.address);
+        expect(await oracle.whitelist.call(0)).to.eq(s1.address);
       });
     });
 
@@ -52,7 +52,7 @@ contract('ExchangeRateAggregator', async accounts => {
       before(async () => {
         snapshot = await chain.snapshotChain();
         for (let i = 0; i < 254; i++) {
-          await aggregator.addSource(s1.address);
+          await oracle.addSource(s1.address);
         }
       });
       after(async () => {
@@ -60,9 +60,9 @@ contract('ExchangeRateAggregator', async accounts => {
       });
 
       it('should fail', async () => {
-        await aggregator.addSource(s1.address);
+        await oracle.addSource(s1.address);
         await chain.expectEthException(
-          aggregator.addSource(s1.address)
+          oracle.addSource(s1.address)
         );
       });
     });
@@ -72,13 +72,13 @@ contract('ExchangeRateAggregator', async accounts => {
     let sourceDelSpy, snapshot;
     before(async () => {
       snapshot = await chain.snapshotChain();
-      await aggregator.addSource(s1.address);
-      await aggregator.addSource(s2.address);
+      await oracle.addSource(s1.address);
+      await oracle.addSource(s2.address);
       sourceDelSpy = new ContractEventSpy([
-        aggregator.SourceRemoved
+        oracle.SourceRemoved
       ]);
       sourceDelSpy.watch();
-      await aggregator.removeSource(s1.address);
+      await oracle.removeSource(s1.address);
     });
     after(async () => {
       sourceDelSpy.stopWatching();
@@ -91,17 +91,17 @@ contract('ExchangeRateAggregator', async accounts => {
       expect(removedEvent.args.source).to.eq(s1.address);
     });
     it('should remove source from the whitelist', async () => {
-      expect(await aggregator.whitelist.call(0)).to.eq(s2.address);
+      expect(await oracle.whitelist.call(0)).to.eq(s2.address);
     });
   });
 
-  describe('aggregate', () => {
+  describe('getPriceAndVolume', () => {
     describe('when the sources are live', () => {
       let snapshot;
       before(async () => {
         snapshot = await chain.snapshotChain();
-        await aggregator.addSource(s1.address);
-        await aggregator.addSource(s2.address);
+        await oracle.addSource(s1.address);
+        await oracle.addSource(s2.address);
         const gasLimit = await chain.getBlockGasLimit();
         await s1.reportRate(1053200000000000000, 2, { from: A, gas: gasLimit });
         await s2.reportRate(1041000000000000000, 3, { from: B, gas: gasLimit });
@@ -110,40 +110,40 @@ contract('ExchangeRateAggregator', async accounts => {
         await chain.revertToSnapshot(snapshot);
       });
 
-      it('should calculate the aggregated rate and volume', async () => {
-        const r = await aggregator.aggregate.call();
+      it('should calculate the combined market rate and volume', async () => {
+        const r = await oracle.getPriceAndVolume.call();
         expect(r[0].toNumber()).to.eq(1045880000000000000);
         expect(r[1].toNumber()).to.eq(5);
       });
     });
 
     describe('when one of sources has expired', () => {
-      let snapshot, aggregatorSpy;
+      let snapshot, oracleSpy;
       before(async () => {
         snapshot = await chain.snapshotChain();
-        await aggregator.addSource(s1.address);
-        await aggregator.addSource(s2.address);
+        await oracle.addSource(s1.address);
+        await oracle.addSource(s2.address);
         const gasLimit = await chain.getBlockGasLimit();
         await s2.reportRate(1041000000000000000, 3, { from: B, gas: gasLimit });
         await chain.waitForSomeTime(3600);
         await s1.reportRate(1053200000000000000, 2, { from: A, gas: gasLimit });
-        aggregatorSpy = new ContractEventSpy([
-          aggregator.SourceExpired
+        oracleSpy = new ContractEventSpy([
+          oracle.SourceExpired
         ]);
-        aggregatorSpy.watch();
-        await aggregator.aggregate.sendTransaction();
+        oracleSpy.watch();
+        await oracle.getPriceAndVolume.sendTransaction();
       });
       after(async () => {
         await chain.revertToSnapshot(snapshot);
       });
 
       it('should emit SourceExpired message', async () => {
-        const expiredEvent = aggregatorSpy.getEventByName('SourceExpired');
+        const expiredEvent = oracleSpy.getEventByName('SourceExpired');
         expect(expiredEvent).to.exist;
         expect(expiredEvent.args.source).to.eq(s2.address);
       });
       it('should calculate the exchange rate', async () => {
-        const r = await aggregator.aggregate.call();
+        const r = await oracle.getPriceAndVolume.call();
         expect(r[0].toNumber()).to.eq(1053200000000000000);
         expect(r[1].toNumber()).to.eq(2);
       });
@@ -153,8 +153,8 @@ contract('ExchangeRateAggregator', async accounts => {
       let snapshot;
       before(async () => {
         snapshot = await chain.snapshotChain();
-        await aggregator.addSource(s1.address);
-        await aggregator.addSource(s2.address);
+        await oracle.addSource(s1.address);
+        await oracle.addSource(s2.address);
         const gasLimit = await chain.getBlockGasLimit();
         await s1.reportRate(1053200000000000000, 2, { from: A, gas: gasLimit });
         await s2.reportRate(1041000000000000000, 3, { from: B, gas: gasLimit });
@@ -165,40 +165,40 @@ contract('ExchangeRateAggregator', async accounts => {
       });
 
       it('should fail', async () => {
-        await chain.expectEthException(aggregator.aggregate());
+        await chain.expectEthException(oracle.getPriceAndVolume());
       });
     });
   });
 
   describe('removeDeadSources', () => {
     describe('when one of sources is NOT live', () => {
-      let snapshot, aggregatorSpy;
+      let snapshot, oracleSpy;
       before(async () => {
         snapshot = await chain.snapshotChain();
-        await aggregator.addSource(s1.address);
-        await aggregator.addSource(s2.address);
+        await oracle.addSource(s1.address);
+        await oracle.addSource(s2.address);
         const gasLimit = await chain.getBlockGasLimit();
         await s1.reportRate(1053200000000000000, 2, { from: A, gas: gasLimit });
         await s2.reportRate(1041000000000000000, 3, { from: B, gas: gasLimit });
         await s1.destroy({ from: A, gas: gasLimit });
-        aggregatorSpy = new ContractEventSpy([
-          aggregator.SourceRemoved
+        oracleSpy = new ContractEventSpy([
+          oracle.SourceRemoved
         ]);
-        aggregatorSpy.watch();
-        await aggregator.removeDeadSources();
+        oracleSpy.watch();
+        await oracle.removeDeadSources();
       });
       after(async () => {
-        aggregatorSpy.stopWatching();
+        oracleSpy.stopWatching();
         await chain.revertToSnapshot(snapshot);
       });
 
       it('should emit SourceRemoved message', async () => {
-        const deadEvent = aggregatorSpy.getEventByName('SourceRemoved');
+        const deadEvent = oracleSpy.getEventByName('SourceRemoved');
         expect(deadEvent).to.exist;
         expect(deadEvent.args.source).to.eq(s1.address);
       });
       it('should remove that source from whitelist', async () => {
-        expect(await aggregator.whitelist.call(0)).to.eq(s2.address);
+        expect(await oracle.whitelist.call(0)).to.eq(s2.address);
       });
     });
   });
diff --git a/test/unit/exchange_rate_source.js b/test/unit/market_source.js
similarity index 88%
rename from test/unit/exchange_rate_source.js
rename to test/unit/market_source.js
index a1be44b..cdecb0e 100644
--- a/test/unit/exchange_rate_source.js
+++ b/test/unit/market_source.js
@@ -1,20 +1,20 @@
-const ExchangeRateFactory = artifacts.require('ExchangeRateFactory.sol');
-const ExchangeRateSource = artifacts.require('ExchangeRateSource.sol');
+const MarketSourceFactory = artifacts.require('MarketSourceFactory.sol');
+const MarketSource = artifacts.require('MarketSource.sol');
 
 const _require = require('app-root-path').require;
 const BlockchainCaller = _require('/util/blockchain_caller');
 const chain = new BlockchainCaller(web3);
 
-contract('ExchangeRateSource', async accounts => {
+contract('MarketSource', async accounts => {
   let factory, source;
   const deployer = accounts[0];
   const A = accounts[1];
   const gasLimit = await chain.getBlockGasLimit();
 
   before(async function () {
-    factory = await ExchangeRateFactory.deployed();
+    factory = await MarketSourceFactory.deployed();
     const r = await factory.createSource('GDAX', { from: A });
-    source = ExchangeRateSource.at(r.logs[0].args.source);
+    source = MarketSource.at(r.logs[0].args.source);
   });
 
   describe('initialization', () => {
diff --git a/test/unit/exchange_rate_factory.js b/test/unit/market_source_factory.js
similarity index 76%
rename from test/unit/exchange_rate_factory.js
rename to test/unit/market_source_factory.js
index 862a63f..1c06e41 100644
--- a/test/unit/exchange_rate_factory.js
+++ b/test/unit/market_source_factory.js
@@ -1,17 +1,17 @@
-const ExchangeRateFactory = artifacts.require('ExchangeRateFactory.sol');
-const ExchangeRateSource = artifacts.require('ExchangeRateSource.sol');
+const MarketSourceFactory = artifacts.require('MarketSourceFactory.sol');
+const MarketSource = artifacts.require('MarketSource.sol');
 
 const _require = require('app-root-path').require;
 const { ContractEventSpy } = _require('/util/spies');
 const BlockchainCaller = _require('/util/blockchain_caller');
 const chain = new BlockchainCaller(web3);
 
-contract('ExchangeRateFactory', async accounts => {
+contract('MarketSourceFactory', async accounts => {
   let factory;
   const A = accounts[1];
 
   before(async function () {
-    factory = await ExchangeRateFactory.deployed();
+    factory = await MarketSourceFactory.deployed();
   });
 
   describe('createSource', () => {
@@ -38,8 +38,8 @@ contract('ExchangeRateFactory', async accounts => {
       expect(await chain.isContract(sourceContractAddr)).to.be.true;
     });
     it('should transfer ownership to sender', async () => {
-      const exchangeRateSource = ExchangeRateSource.at(sourceContractAddr);
-      expect(await exchangeRateSource.owner.call()).to.eq(A);
+      const marketSource = MarketSource.at(sourceContractAddr);
+      expect(await marketSource.owner.call()).to.eq(A);
     });
   });
 });