Merge branch 'master' into wrap-log-bignumber

15 files changed, 348 insertions, 104 deletions

diff --git a/src/0x.ts b/src/0x.ts
index d7a01ba70..b56a2f949 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -15,8 +15,8 @@ import {TokenRegistryWrapper} from './contract_wrappers/token_registry_wrapper';
 import {EtherTokenWrapper} from './contract_wrappers/ether_token_wrapper';
 import {ecSignatureSchema} from './schemas/ec_signature_schema';
 import {TokenWrapper} from './contract_wrappers/token_wrapper';
+import {ProxyWrapper} from './contract_wrappers/proxy_wrapper';
 import {ECSignature, ZeroExError, Order, SignedOrder, Web3Provider} from './types';
-import * as ExchangeArtifacts from './artifacts/Exchange.json';
 import {orderSchema} from './schemas/order_schemas';
 
 // Customize our BigNumber instances
@@ -52,6 +52,7 @@ export class ZeroEx {
      * wrapped ETH ERC20 token smart contract.
      */
     public etherToken: EtherTokenWrapper;
+    private _proxyWrapper: ProxyWrapper;
     private _web3Wrapper: Web3Wrapper;
     /**
      * Verifies that the elliptic curve signature `signature` was generated
@@ -149,7 +150,8 @@ export class ZeroEx {
     constructor(provider: Web3Provider) {
         this._web3Wrapper = new Web3Wrapper(provider);
         this.token = new TokenWrapper(this._web3Wrapper);
-        this.exchange = new ExchangeWrapper(this._web3Wrapper, this.token);
+        this._proxyWrapper = new ProxyWrapper(this._web3Wrapper);
+        this.exchange = new ExchangeWrapper(this._web3Wrapper, this.token, this._proxyWrapper);
         this.tokenRegistry = new TokenRegistryWrapper(this._web3Wrapper);
         this.etherToken = new EtherTokenWrapper(this._web3Wrapper, this.token);
     }
@@ -160,9 +162,10 @@ export class ZeroEx {
      */
     public async setProviderAsync(provider: Web3Provider) {
         this._web3Wrapper.setProvider(provider);
-        await this.exchange.invalidateContractInstanceAsync();
+        await this.exchange.invalidateContractInstancesAsync();
         this.tokenRegistry.invalidateContractInstance();
         this.token.invalidateContractInstances();
+        this._proxyWrapper.invalidateContractInstance();
     }
     /**
      * Get user Ethereum addresses available through the supplied web3 instance available for sending transactions.
@@ -177,11 +180,9 @@ export class ZeroEx {
      * @param   order   An object that conforms to the Order or SignedOrder interface definitions.
      * @return  The resulting orderHash from hashing the supplied order.
      */
-    public async getOrderHashHexAsync(order: Order|SignedOrder): Promise<string> {
+    public getOrderHashHex(order: Order|SignedOrder): string {
         assert.doesConformToSchema('order', order, orderSchema);
-
-        const exchangeContractAddr = await this._getExchangeAddressAsync();
-        const orderHashHex = utils.getOrderHashHex(order, exchangeContractAddr);
+        const orderHashHex = utils.getOrderHashHex(order);
         return orderHashHex;
     }
     /**
@@ -199,8 +200,9 @@ export class ZeroEx {
         let msgHashHex;
         const nodeVersion = await this._web3Wrapper.getNodeVersionAsync();
         const isParityNode = utils.isParityNode(nodeVersion);
-        if (isParityNode) {
-            // Parity node adds the personalMessage prefix itself
+        const isTestRpc = utils.isTestRpc(nodeVersion);
+        if (isParityNode || isTestRpc) {
+            // Parity and TestRpc nodes add the personalMessage prefix itself
             msgHashHex = orderHash;
         } else {
             const orderHashBuff = ethUtil.toBuffer(orderHash);
@@ -244,15 +246,4 @@ export class ZeroEx {
         }
         return ecSignature;
     }
-    private async _getExchangeAddressAsync() {
-        const networkIdIfExists = await this._web3Wrapper.getNetworkIdIfExistsAsync();
-        const exchangeNetworkConfigsIfExists = _.isUndefined(networkIdIfExists) ?
-                                       undefined :
-                                       (ExchangeArtifacts as any).networks[networkIdIfExists];
-        if (_.isUndefined(exchangeNetworkConfigsIfExists)) {
-            throw new Error(ZeroExError.CONTRACT_NOT_DEPLOYED_ON_NETWORK);
-        }
-        const exchangeAddress = exchangeNetworkConfigsIfExists.address;
-        return exchangeAddress;
-    }
 }
diff --git a/src/artifacts/EtherToken.json b/src/artifacts/EtherToken.json
index 0307cb22c..3ca4bd797 100644
--- a/src/artifacts/EtherToken.json
+++ b/src/artifacts/EtherToken.json
@@ -229,7 +229,7 @@
       "type": "event"
     }
   ],
-  "unlinked_binary": "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",
+  "unlinked_binary": "0x6060604052341561000c57fe5b5b6107218061001c6000396000f300606060405236156100935763ffffffff60e060020a60003504166306fdde038114610095578063095ea7b31461012557806318160ddd1461015857806323b872dd1461017a5780632e1a7d4d146101b3578063313ce567146101c857806370a08231146101ee57806395d89b411461021c578063a9059cbb146102ac578063d0e30db0146102df578063dd62ed3e146102e9575bfe5b341561009d57fe5b6100a561031d565b6040805160208082528351818301528351919283929083019185019080838382156100eb575b8051825260208311156100eb57601f1990920191602091820191016100cb565b505050905090810190601f1680156101175780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b341561012d57fe5b610144600160a060020a0360043516602435610345565b604080519115158252519081900360200190f35b341561016057fe5b6101686103b0565b60408051918252519081900360200190f35b341561018257fe5b610144600160a060020a03600435811690602435166044356103b6565b604080519115158252519081900360200190f35b34156101bb57fe5b6101c66004356104a1565b005b34156101d057fe5b6101d8610522565b6040805160ff9092168252519081900360200190f35b34156101f657fe5b610168600160a060020a0360043516610527565b60408051918252519081900360200190f35b341561022457fe5b6100a5610546565b6040805160208082528351818301528351919283929083019185019080838382156100eb575b8051825260208311156100eb57601f1990920191602091820191016100cb565b505050905090810190601f1680156101175780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b34156102b457fe5b610144600160a060020a0360043516602435610567565b604080519115158252519081900360200190f35b6101c6610607565b005b34156102f157fe5b610168600160a060020a0360043581169060243516610656565b60408051918252519081900360200190f35b60408051808201909152600b815260a960020a6a22ba3432b9102a37b5b2b702602082015281565b600160a060020a03338116600081815260016020908152604080832094871680845294825280832086905580518681529051929493927f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925929181900390910190a35060015b92915050565b60025481565b600160a060020a0383166000908152602081905260408120546103d99083610683565b600160a060020a0380861660009081526020818152604080832094909455600181528382203390931682529190915220546104149083610683565b600160a060020a03808616600090815260016020908152604080832033851684528252808320949094559186168152908190522054610453908361069c565b600160a060020a038085166000818152602081815260409182902094909455805186815290519193928816926000805160206106d683398151915292918290030190a35060015b9392505050565b600160a060020a0333166000908152602081905260409020546104c49082610683565b600160a060020a0333166000908152602081905260409020556002546104ea9082610683565b600255604051600160a060020a0333169082156108fc029083906000818181858888f19350505050151561051e5760006000fd5b5b50565b601281565b600160a060020a0381166000908152602081905260409020545b919050565b604080518082019091526004815260e360020a630ae8aa8902602082015281565b600160a060020a03331660009081526020819052604081205461058a9083610683565b600160a060020a0333811660009081526020819052604080822093909355908516815220546105b9908361069c565b600160a060020a03808516600081815260208181526040918290209490945580518681529051919333909316926000805160206106d683398151915292918290030190a35060015b92915050565b600160a060020a03331660009081526020819052604090205461062a903461069c565b600160a060020a033316600090815260208190526040902055600254610650903461069c565b6002555b565b600160a060020a038083166000908152600160209081526040808320938516835292905220545b92915050565b6000610691838311156106c4565b508082035b92915050565b60008282016106b98482108015906106b45750838210155b6106c4565b8091505b5092915050565b80151561051e5760006000fd5b5b505600ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3efa165627a7a72305820d39a3d758ea0042048564f60b0e39c59508468d4de91cd9b7b5f708b554f699c0029",
   "networks": {
     "42": {
       "links": {},
@@ -330,10 +330,10 @@
           "type": "event"
         }
       },
-      "updated_at": 1495030736786,
+      "updated_at": 1498588231356,
       "address": "0x48bacb9266a570d521063ef5dd96e61686dbe788"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1496294576956
+  "updated_at": 1498588231356
 }
\ No newline at end of file
diff --git a/src/artifacts/Mintable.json b/src/artifacts/Mintable.json
index eed87f498..fc4b93cae 100644
--- a/src/artifacts/Mintable.json
+++ b/src/artifacts/Mintable.json
@@ -182,8 +182,8 @@
       "type": "event"
     }
   ],
-  "unlinked_binary": "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",
+  "unlinked_binary": "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",
   "networks": {},
   "schema_version": "0.0.5",
-  "updated_at": 1496294434244
+  "updated_at": 1498588228068
 }
\ No newline at end of file
diff --git a/src/artifacts/Proxy.json b/src/artifacts/Proxy.json
index e7d4ba714..c001cee5b 100644
--- a/src/artifacts/Proxy.json
+++ b/src/artifacts/Proxy.json
@@ -177,7 +177,7 @@
       "type": "event"
     }
   ],
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   "networks": {
     "42": {
       "links": {},
@@ -258,10 +258,10 @@
           "type": "event"
         }
       },
-      "updated_at": 1495030736781,
+      "updated_at": 1498588231340,
       "address": "0x871dd7c2b4b25e1aa18728e9d5f2af4c4e431f5c"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1496294576942
+  "updated_at": 1498588231340
 }
\ No newline at end of file
diff --git a/src/artifacts/Token.json b/src/artifacts/Token.json
index 4894f5be5..f44de34b8 100644
--- a/src/artifacts/Token.json
+++ b/src/artifacts/Token.json
@@ -169,8 +169,8 @@
       "type": "event"
     }
   ],
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+  "unlinked_binary": "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",
   "networks": {},
   "schema_version": "0.0.5",
-  "updated_at": 1496294434247
+  "updated_at": 1498588228068
 }
\ No newline at end of file
diff --git a/src/artifacts/TokenRegistry.json b/src/artifacts/TokenRegistry.json
index ef039b85c..6d8bbfd64 100644
--- a/src/artifacts/TokenRegistry.json
+++ b/src/artifacts/TokenRegistry.json
@@ -592,7 +592,7 @@
       "type": "event"
     }
   ],
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   "networks": {
     "42": {
       "links": {},
@@ -993,10 +993,10 @@
           "type": "event"
         }
       },
-      "updated_at": 1495030736781,
+      "updated_at": 1498588231341,
       "address": "0x0b1ba0af832d7c05fd64161e0db78e85978e8082"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1496294576947
+  "updated_at": 1498588231341
 }
\ No newline at end of file
diff --git a/src/artifacts/Exchange.json b/src/artifacts/exchange/Exchange_v1.json
index bcb8aece0..4b7321970 100644
--- a/src/artifacts/Exchange.json
+++ b/src/artifacts/exchange/Exchange_v1.json
@@ -606,7 +606,7 @@
       "type": "event"
     }
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   "networks": {
     "42": {
       "links": {},
@@ -1048,12 +1048,121 @@
           ],
           "name": "LogError",
           "type": "event"
+        },
+        "0x0d0b9391970d9a25552f37d436d2aae2925e2bfe1b2a923754bada030c498cb3": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "maker",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "taker",
+              "type": "address"
+            },
+            {
+              "indexed": true,
+              "name": "feeRecipient",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "tokenM",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "tokenT",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "filledValueM",
+              "type": "uint256"
+            },
+            {
+              "indexed": false,
+              "name": "filledValueT",
+              "type": "uint256"
+            },
+            {
+              "indexed": false,
+              "name": "feeMPaid",
+              "type": "uint256"
+            },
+            {
+              "indexed": false,
+              "name": "feeTPaid",
+              "type": "uint256"
+            },
+            {
+              "indexed": true,
+              "name": "tokens",
+              "type": "bytes32"
+            },
+            {
+              "indexed": false,
+              "name": "orderHash",
+              "type": "bytes32"
+            }
+          ],
+          "name": "LogFill",
+          "type": "event"
+        },
+        "0x67d66f160bc93d925d05dae1794c90d2d6d6688b29b84ff069398a9b04587131": {
+          "anonymous": false,
+          "inputs": [
+            {
+              "indexed": true,
+              "name": "maker",
+              "type": "address"
+            },
+            {
+              "indexed": true,
+              "name": "feeRecipient",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "tokenM",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "tokenT",
+              "type": "address"
+            },
+            {
+              "indexed": false,
+              "name": "cancelledValueM",
+              "type": "uint256"
+            },
+            {
+              "indexed": false,
+              "name": "cancelledValueT",
+              "type": "uint256"
+            },
+            {
+              "indexed": true,
+              "name": "tokens",
+              "type": "bytes32"
+            },
+            {
+              "indexed": false,
+              "name": "orderHash",
+              "type": "bytes32"
+            }
+          ],
+          "name": "LogCancel",
+          "type": "event"
         }
       },
-      "updated_at": 1495030736784,
+      "updated_at": 1498588231353,
       "address": "0xb69e673309512a9d726f87304c6984054f87a93b"
     }
   },
   "schema_version": "0.0.5",
-  "updated_at": 1496294576952
+  "updated_at": 1498588231353
 }
\ No newline at end of file
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 7ee7a04ee..2d46b99de 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -8,6 +8,7 @@ import {
     ExchangeContract,
     ExchangeContractErrCodes,
     ExchangeContractErrs,
+    ZeroExError,
     OrderValues,
     OrderAddresses,
     Order,
@@ -28,11 +29,14 @@ import {
     LogCancelContractEventArgs,
     EventCallback,
     ContractEventArg,
+    ExchangeContractByAddress,
+    ContractArtifact,
 } from '../types';
 import {assert} from '../utils/assert';
 import {utils} from '../utils/utils';
 import {ContractWrapper} from './contract_wrapper';
-import * as ExchangeArtifacts from '../artifacts/Exchange.json';
+import {ProxyWrapper} from './proxy_wrapper';
+import {ExchangeArtifactsByName} from '../exchange_artifacts_by_name';
 import {ecSignatureSchema} from '../schemas/ec_signature_schema';
 import {signedOrdersSchema} from '../schemas/signed_orders_schema';
 import {orderFillRequestsSchema} from '../schemas/order_fill_requests_schema';
@@ -56,9 +60,10 @@ export class ExchangeWrapper extends ContractWrapper {
         [ExchangeContractErrCodes.ERROR_FILL_TRUNCATION]: ExchangeContractErrs.ORDER_FILL_ROUNDING_ERROR,
         [ExchangeContractErrCodes.ERROR_FILL_BALANCE_ALLOWANCE]: ExchangeContractErrs.FILL_BALANCE_ALLOWANCE_ERROR,
     };
-    private _exchangeContractIfExists?: ExchangeContract;
+    private _exchangeContractByAddress: ExchangeContractByAddress;
     private _exchangeLogEventEmitters: ContractEventEmitter[];
     private _tokenWrapper: TokenWrapper;
+    private _proxyWrapper: ProxyWrapper;
     private static _getOrderAddressesAndValues(order: Order): [OrderAddresses, OrderValues] {
         const orderAddresses: OrderAddresses = [
             order.maker,
@@ -77,27 +82,31 @@ export class ExchangeWrapper extends ContractWrapper {
         ];
         return [orderAddresses, orderValues];
     }
-    constructor(web3Wrapper: Web3Wrapper, tokenWrapper: TokenWrapper) {
+    constructor(web3Wrapper: Web3Wrapper, tokenWrapper: TokenWrapper, proxyWrapper: ProxyWrapper) {
         super(web3Wrapper);
         this._tokenWrapper = tokenWrapper;
+        this._proxyWrapper = proxyWrapper;
         this._exchangeLogEventEmitters = [];
+        this._exchangeContractByAddress = {};
     }
-    public async invalidateContractInstanceAsync(): Promise<void> {
+    public async invalidateContractInstancesAsync(): Promise<void> {
         await this.stopWatchingAllEventsAsync();
-        delete this._exchangeContractIfExists;
+        this._exchangeContractByAddress = {};
     }
     /**
      * Returns the unavailable takerAmount of an order. Unavailable amount is defined as the total
      * amount that has been filled or cancelled. The remaining takerAmount can be calculated by
      * subtracting the unavailable amount from the total order takerAmount.
-     * @param   orderHash    The hex encoded orderHash for which you would like to retrieve the
-     *                       unavailable takerAmount.
+     * @param   orderHash               The hex encoded orderHash for which you would like to retrieve the
+     *                                  unavailable takerAmount.
+     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to use.
      * @return  The amount of the order (in taker tokens) that has either been filled or canceled.
      */
-    public async getUnavailableTakerAmountAsync(orderHash: string): Promise<BigNumber.BigNumber> {
+    public async getUnavailableTakerAmountAsync(orderHash: string,
+                                                exchangeContractAddress: string): Promise<BigNumber.BigNumber> {
         assert.isValidOrderHash('orderHash', orderHash);
 
-        const exchangeContract = await this._getExchangeContractAsync();
+        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
         let unavailableAmountInBaseUnits = await exchangeContract.getUnavailableValueT.call(orderHash);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         unavailableAmountInBaseUnits = new BigNumber(unavailableAmountInBaseUnits);
@@ -106,12 +115,14 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Retrieve the takerAmount of an order that has already been filled.
      * @param   orderHash    The hex encoded orderHash for which you would like to retrieve the filled takerAmount.
+     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to use.
      * @return  The amount of the order (in taker tokens) that has already been filled.
      */
-    public async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber.BigNumber> {
+    public async getFilledTakerAmountAsync(orderHash: string,
+                                           exchangeContractAddress: string): Promise<BigNumber.BigNumber> {
         assert.isValidOrderHash('orderHash', orderHash);
 
-        const exchangeContract = await this._getExchangeContractAsync();
+        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
         let fillAmountInBaseUnits = await exchangeContract.filled.call(orderHash);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         fillAmountInBaseUnits = new BigNumber(fillAmountInBaseUnits);
@@ -121,12 +132,14 @@ export class ExchangeWrapper extends ContractWrapper {
      * Retrieve the takerAmount of an order that has been cancelled.
      * @param   orderHash    The hex encoded orderHash for which you would like to retrieve the
      *                       cancelled takerAmount.
+     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to use.
      * @return  The amount of the order (in taker tokens) that has been cancelled.
      */
-    public async getCanceledTakerAmountAsync(orderHash: string): Promise<BigNumber.BigNumber> {
+    public async getCanceledTakerAmountAsync(orderHash: string,
+                                             exchangeContractAddress: string): Promise<BigNumber.BigNumber> {
         assert.isValidOrderHash('orderHash', orderHash);
 
-        const exchangeContract = await this._getExchangeContractAsync();
+        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
         let cancelledAmountInBaseUnits = await exchangeContract.cancelled.call(orderHash);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         cancelledAmountInBaseUnits = new BigNumber(cancelledAmountInBaseUnits);
@@ -155,7 +168,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isBoolean('shouldCheckTransfer', shouldCheckTransfer);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
 
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(signedOrder.exchangeContractAddress);
         await this._validateFillOrderAndThrowIfInvalidAsync(signedOrder, takerTokenFillAmount, takerAddress);
 
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(signedOrder);
@@ -208,12 +221,15 @@ export class ExchangeWrapper extends ContractWrapper {
     @decorators.contractCallErrorHandler
     public async fillOrdersUpToAsync(signedOrders: SignedOrder[], takerTokenFillAmount: BigNumber.BigNumber,
                                      shouldCheckTransfer: boolean, takerAddress: string): Promise<BigNumber.BigNumber> {
+        assert.doesConformToSchema('signedOrders', signedOrders, signedOrdersSchema);
         const takerTokenAddresses = _.map(signedOrders, signedOrder => signedOrder.takerTokenAddress);
         assert.hasAtMostOneUniqueValue(takerTokenAddresses,
-                                        ExchangeContractErrs.MULTIPLE_TAKER_TOKENS_IN_FILL_UP_TO_DISALLOWED);
+                                       ExchangeContractErrs.MULTIPLE_TAKER_TOKENS_IN_FILL_UP_TO_DISALLOWED);
+        const exchangeContractAddresses = _.map(signedOrders, signedOrder => signedOrder.exchangeContractAddress);
+        assert.hasAtMostOneUniqueValue(exchangeContractAddresses,
+                                       ExchangeContractErrs.BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS);
         assert.isBigNumber('takerTokenFillAmount', takerTokenFillAmount);
         assert.isBoolean('shouldCheckTransfer', shouldCheckTransfer);
-        assert.doesConformToSchema('signedOrders', signedOrders, signedOrdersSchema);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         for (const signedOrder of signedOrders) {
             await this._validateFillOrderAndThrowIfInvalidAsync(
@@ -236,7 +252,7 @@ export class ExchangeWrapper extends ContractWrapper {
             orderAddressesValuesAndSignatureArray,
         );
 
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
         const gas = await exchangeInstance.fillUpTo.estimateGas(
             orderAddressesArray,
             orderValuesArray,
@@ -285,9 +301,15 @@ export class ExchangeWrapper extends ContractWrapper {
     @decorators.contractCallErrorHandler
     public async batchFillOrderAsync(orderFillRequests: OrderFillRequest[],
                                      shouldCheckTransfer: boolean, takerAddress: string): Promise<void> {
+        assert.doesConformToSchema('orderFillRequests', orderFillRequests, orderFillRequestsSchema);
+        const exchangeContractAddresses = _.map(
+            orderFillRequests,
+            orderFillRequest => orderFillRequest.signedOrder.exchangeContractAddress,
+        );
+        assert.hasAtMostOneUniqueValue(exchangeContractAddresses,
+                                       ExchangeContractErrs.BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS);
         assert.isBoolean('shouldCheckTransfer', shouldCheckTransfer);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
-        assert.doesConformToSchema('orderFillRequests', orderFillRequests, orderFillRequestsSchema);
         for (const orderFillRequest of orderFillRequests) {
             await this._validateFillOrderAndThrowIfInvalidAsync(
                 orderFillRequest.signedOrder, orderFillRequest.takerTokenFillAmount, takerAddress);
@@ -310,7 +332,7 @@ export class ExchangeWrapper extends ContractWrapper {
             orderAddressesValuesAmountsAndSignatureArray,
         );
 
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
         const gas = await exchangeInstance.batchFill.estimateGas(
             orderAddressesArray,
             orderValuesArray,
@@ -354,7 +376,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isBigNumber('takerTokenFillAmount', takerTokenFillAmount);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
 
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(signedOrder.exchangeContractAddress);
         await this._validateFillOrderAndThrowIfInvalidAsync(signedOrder, takerTokenFillAmount, takerAddress);
 
         await this._validateFillOrKillOrderAndThrowIfInvalidAsync(signedOrder, exchangeInstance.address,
@@ -397,9 +419,18 @@ export class ExchangeWrapper extends ContractWrapper {
     @decorators.contractCallErrorHandler
     public async batchFillOrKillAsync(orderFillOrKillRequests: OrderFillOrKillRequest[],
                                       takerAddress: string): Promise<void> {
-        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         assert.doesConformToSchema('orderFillOrKillRequests', orderFillOrKillRequests, orderFillOrKillRequestsSchema);
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeContractAddresses = _.map(
+            orderFillOrKillRequests,
+            orderFillOrKillRequest => orderFillOrKillRequest.signedOrder.exchangeContractAddress,
+        );
+        assert.hasAtMostOneUniqueValue(exchangeContractAddresses,
+                                       ExchangeContractErrs.BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        if (_.isEmpty(orderFillOrKillRequests)) {
+            return; // no-op
+        }
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
         for (const request of orderFillOrKillRequests) {
             await this._validateFillOrKillOrderAndThrowIfInvalidAsync(request.signedOrder, exchangeInstance.address,
                                                                      request.fillTakerAmount);
@@ -458,7 +489,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isBigNumber('takerTokenCancelAmount', takerTokenCancelAmount);
         await assert.isSenderAddressAsync('order.maker', order.maker, this._web3Wrapper);
 
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(order.exchangeContractAddress);
         await this._validateCancelOrderAndThrowIfInvalidAsync(order, takerTokenCancelAmount);
 
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(order);
@@ -492,12 +523,18 @@ export class ExchangeWrapper extends ContractWrapper {
      */
     @decorators.contractCallErrorHandler
     public async batchCancelOrderAsync(orderCancellationRequests: OrderCancellationRequest[]): Promise<void> {
+        assert.doesConformToSchema('orderCancellationRequests', orderCancellationRequests,
+                                   orderCancellationRequestsSchema);
+        const exchangeContractAddresses = _.map(
+            orderCancellationRequests,
+            orderCancellationRequest => orderCancellationRequest.order.exchangeContractAddress,
+        );
+        assert.hasAtMostOneUniqueValue(exchangeContractAddresses,
+                                       ExchangeContractErrs.BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS);
         const makers = _.map(orderCancellationRequests, cancellationRequest => cancellationRequest.order.maker);
         assert.hasAtMostOneUniqueValue(makers, ExchangeContractErrs.MULTIPLE_MAKERS_IN_SINGLE_CANCEL_BATCH_DISALLOWED);
         const maker = makers[0];
         await assert.isSenderAddressAsync('maker', maker, this._web3Wrapper);
-        assert.doesConformToSchema('orderCancellationRequests', orderCancellationRequests,
-                                   orderCancellationRequestsSchema);
         for (const cancellationRequest of orderCancellationRequests) {
             await this._validateCancelOrderAndThrowIfInvalidAsync(
                 cancellationRequest.order, cancellationRequest.takerTokenCancelAmount,
@@ -506,7 +543,7 @@ export class ExchangeWrapper extends ContractWrapper {
         if (_.isEmpty(orderCancellationRequests)) {
             return; // no-op
         }
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
         const orderAddressesValuesAndTakerTokenCancelAmounts = _.map(orderCancellationRequests, cancellationRequest => {
             return [
                 ...ExchangeWrapper._getOrderAddressesAndValues(cancellationRequest.order),
@@ -537,16 +574,17 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     /**
      * Subscribe to an event type emitted by the Exchange smart contract
-     * @param   eventName           The exchange contract event you would like to subscribe to.
-     * @param   subscriptionOpts    Subscriptions options that let you configure the subscription.
-     * @param   indexFilterValues   An object where the keys are indexed args returned by the event and
-     *                              the value is the value you are interested in. E.g `{maker: aUserAddressHex}`
+     * @param   eventName               The exchange contract event you would like to subscribe to.
+     * @param   subscriptionOpts        Subscriptions options that let you configure the subscription.
+     * @param   indexFilterValues       An object where the keys are indexed args returned by the event and
+     *                                  the value is the value you are interested in. E.g `{maker: aUserAddressHex}`
+     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to use.
      * @return                      ContractEventEmitter object
      */
     public async subscribeAsync(eventName: ExchangeEvents, subscriptionOpts: SubscriptionOpts,
-                                indexFilterValues: IndexedFilterValues):
+                                indexFilterValues: IndexedFilterValues, exchangeContractAddress: string):
                                 Promise<ContractEventEmitter> {
-        const exchangeContract = await this._getExchangeContractAsync();
+        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
         let createLogEvent: CreateContractEvent;
         switch (eventName) {
             case ExchangeEvents.LogFill:
@@ -568,13 +606,41 @@ export class ExchangeWrapper extends ContractWrapper {
         return eventEmitter;
     }
     /**
-     * Returns the ethereum address of the current exchange contract
+     * Returns the ethereum addresses of all available exchange contracts
      * on the network that the provided web3 instance is connected to
-     * @return  The ethereum address of the current exchange contract.
+     * @return  The ethereum addresses of all available exchange contracts.
      */
-    public async getContractAddressAsync(): Promise<string> {
-       const exchangeContract = await this._getExchangeContractAsync();
-       return exchangeContract.address;
+    public async getAvailableContractAddressesAsync(): Promise<string[]> {
+        const networkId = await this._web3Wrapper.getNetworkIdIfExistsAsync();
+        if (_.isUndefined(networkId)) {
+            return [];
+        } else {
+            const exchangeArtifacts = _.values(ExchangeArtifactsByName);
+            const networkSpecificExchangeArtifacts = _.compact(_.map(
+                exchangeArtifacts, exchangeArtifact => exchangeArtifact.networks[networkId]));
+            const exchangeAddresses = _.map(
+                networkSpecificExchangeArtifacts,
+                networkSpecificExchangeArtifact => networkSpecificExchangeArtifact.address,
+            );
+            return exchangeAddresses;
+        }
+    }
+    /**
+     * Returns the ethereum addresses of all available exchange contracts
+     * on the network that the provided web3 instance is connected to
+     * that are currently authorized on the Proxy contract
+     * @return  The ethereum addresses of all available and authorized exchange contract.
+     */
+    public async getProxyAuthorizedContractAddressesAsync(): Promise<string[]> {
+        const exchangeContractAddresses = await this.getAvailableContractAddressesAsync();
+        const proxyAuthorizedExchangeContractAddresses = [];
+        for (const exchangeContractAddress of exchangeContractAddresses) {
+            const isAuthorized = await this._isExchangeContractAddressProxyAuthorizedAsync(exchangeContractAddress);
+            if (isAuthorized) {
+                proxyAuthorizedExchangeContractAddresses.push(exchangeContractAddress);
+            }
+        }
+        return proxyAuthorizedExchangeContractAddresses;
     }
     /**
      * Stops watching for all exchange events
@@ -585,6 +651,10 @@ export class ExchangeWrapper extends ContractWrapper {
         await Promise.all(stopWatchingPromises);
         this._exchangeLogEventEmitters = [];
     }
+    private async _isExchangeContractAddressProxyAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
+        const isAuthorized = await this._proxyWrapper.isAuthorizedAsync(exchangeContractAddress);
+        return isAuthorized;
+    }
     private _wrapEventEmitter(event: ContractEventObj): ContractEventEmitter {
         const watch = (eventCallback: EventCallback) => {
             const bignumberWrappingEventCallback = this._wrapEventCallback(eventCallback);
@@ -617,12 +687,13 @@ export class ExchangeWrapper extends ContractWrapper {
         return bignumberWrappingEventCallback;
     }
     private async _isValidSignatureUsingContractCallAsync(dataHex: string, ecSignature: ECSignature,
-                                                          signerAddressHex: string): Promise<boolean> {
+                                                          signerAddressHex: string,
+                                                          exchangeContractAddress: string): Promise<boolean> {
         assert.isHexString('dataHex', dataHex);
         assert.doesConformToSchema('ecSignature', ecSignature, ecSignatureSchema);
         assert.isETHAddressHex('signerAddressHex', signerAddressHex);
 
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddress);
 
         const isValidSignature = await exchangeInstance.isValidSignature.call(
             signerAddressHex,
@@ -633,13 +704,8 @@ export class ExchangeWrapper extends ContractWrapper {
         );
         return isValidSignature;
     }
-    private async _getOrderHashHexAsync(order: Order|SignedOrder): Promise<string> {
-        const exchangeInstance = await this._getExchangeContractAsync();
-        const orderHashHex = utils.getOrderHashHex(order, exchangeInstance.address);
-        return orderHashHex;
-    }
     private async _getOrderHashHexUsingContractCallAsync(order: Order|SignedOrder): Promise<string> {
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(order.exchangeContractAddress);
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(order);
         const orderHashHex = await exchangeInstance.getOrderHash.call(orderAddresses, orderValues);
         return orderHashHex;
@@ -657,12 +723,13 @@ export class ExchangeWrapper extends ContractWrapper {
         if (signedOrder.expirationUnixTimestampSec.lessThan(currentUnixTimestampSec)) {
             throw new Error(ExchangeContractErrs.ORDER_FILL_EXPIRED);
         }
-        const zrxTokenAddress = await this._getZRXTokenAddressAsync();
+        const zrxTokenAddress = await this._getZRXTokenAddressAsync(signedOrder.exchangeContractAddress);
         await this._validateFillOrderBalancesAndAllowancesAndThrowIfInvalidAsync(signedOrder, fillTakerAmount,
                                                                senderAddress, zrxTokenAddress);
 
         const wouldRoundingErrorOccur = await this._isRoundingErrorAsync(
             signedOrder.takerTokenAmount, fillTakerAmount, signedOrder.makerTokenAmount,
+            signedOrder.exchangeContractAddress,
         );
         if (wouldRoundingErrorOccur) {
             throw new Error(ExchangeContractErrs.ORDER_FILL_ROUNDING_ERROR);
@@ -673,8 +740,8 @@ export class ExchangeWrapper extends ContractWrapper {
         if (takerTokenCancelAmount.eq(0)) {
             throw new Error(ExchangeContractErrs.ORDER_CANCEL_AMOUNT_ZERO);
         }
-        const orderHash = await this._getOrderHashHexAsync(order);
-        const unavailableAmount = await this.getUnavailableTakerAmountAsync(orderHash);
+        const orderHash = utils.getOrderHashHex(order);
+        const unavailableAmount = await this.getUnavailableTakerAmountAsync(orderHash, order.exchangeContractAddress);
         if (order.takerTokenAmount.minus(unavailableAmount).eq(0)) {
             throw new Error(ExchangeContractErrs.ORDER_ALREADY_CANCELLED_OR_FILLED);
         }
@@ -684,11 +751,11 @@ export class ExchangeWrapper extends ContractWrapper {
         }
     }
     private async _validateFillOrKillOrderAndThrowIfInvalidAsync(signedOrder: SignedOrder,
-                                                                 exchangeAddress: string,
+                                                                 exchangeContractAddress: string,
                                                                  fillTakerAmount: BigNumber.BigNumber) {
         // Check that fillValue available >= fillTakerAmount
-        const orderHashHex = utils.getOrderHashHex(signedOrder, exchangeAddress);
-        const unavailableTakerAmount = await this.getUnavailableTakerAmountAsync(orderHashHex);
+        const orderHashHex = utils.getOrderHashHex(signedOrder);
+        const unavailableTakerAmount = await this.getUnavailableTakerAmountAsync(orderHashHex, exchangeContractAddress);
         const remainingTakerAmount = signedOrder.takerTokenAmount.minus(unavailableTakerAmount);
         if (remainingTakerAmount < fillTakerAmount) {
             throw new Error(ExchangeContractErrs.INSUFFICIENT_REMAINING_FILL_AMOUNT);
@@ -765,24 +832,41 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     private async _isRoundingErrorAsync(takerTokenAmount: BigNumber.BigNumber,
                                         fillTakerAmount: BigNumber.BigNumber,
-                                        makerTokenAmount: BigNumber.BigNumber): Promise<boolean> {
+                                        makerTokenAmount: BigNumber.BigNumber,
+                                        exchangeContractAddress: string): Promise<boolean> {
         await assert.isUserAddressAvailableAsync(this._web3Wrapper);
-        const exchangeInstance = await this._getExchangeContractAsync();
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddress);
         const isRoundingError = await exchangeInstance.isRoundingError.call(
             takerTokenAmount, fillTakerAmount, makerTokenAmount,
         );
         return isRoundingError;
     }
-    private async _getExchangeContractAsync(): Promise<ExchangeContract> {
-        if (!_.isUndefined(this._exchangeContractIfExists)) {
-            return this._exchangeContractIfExists;
+    private async _getExchangeContractAsync(exchangeContractAddress: string): Promise<ExchangeContract> {
+        if (!_.isUndefined(this._exchangeContractByAddress[exchangeContractAddress])) {
+            return this._exchangeContractByAddress[exchangeContractAddress];
         }
+        const ExchangeArtifacts = this._getExchangeArtifactsByAddressOrThrow(exchangeContractAddress);
         const contractInstance = await this._instantiateContractIfExistsAsync((ExchangeArtifacts as any));
-        this._exchangeContractIfExists = contractInstance as ExchangeContract;
-        return this._exchangeContractIfExists;
+        this._exchangeContractByAddress[exchangeContractAddress] = contractInstance as ExchangeContract;
+        return this._exchangeContractByAddress[exchangeContractAddress];
+    }
+    private _getExchangeArtifactsByAddressOrThrow(exchangeContractAddress: string): ContractArtifact {
+        const exchangeArtifacts = _.values<ContractArtifact>(ExchangeArtifactsByName);
+        for (const exchangeArtifact of exchangeArtifacts) {
+            const networkSpecificExchangeArtifactValues = _.values(exchangeArtifact.networks);
+            const exchangeAddressesInArtifact = _.map(
+                networkSpecificExchangeArtifactValues,
+                networkSpecificExchangeArtifact => networkSpecificExchangeArtifact.address,
+            );
+            if (_.includes(exchangeAddressesInArtifact, exchangeContractAddress)) {
+                return exchangeArtifact;
+            }
+        }
+        throw new Error(ZeroExError.EXCHANGE_CONTRACT_DOES_NOT_EXIST);
     }
-    private async _getZRXTokenAddressAsync(): Promise<string> {
-        const exchangeInstance = await this._getExchangeContractAsync();
-        return exchangeInstance.ZRX.call();
+    private async _getZRXTokenAddressAsync(exchangeContractAddress: string): Promise<string> {
+        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddress);
+        const ZRXtokenAddress = await exchangeInstance.ZRX.call();
+        return ZRXtokenAddress;
     }
 }
diff --git a/src/contract_wrappers/proxy_wrapper.ts b/src/contract_wrappers/proxy_wrapper.ts
new file mode 100644
index 000000000..862bce131
--- /dev/null
+++ b/src/contract_wrappers/proxy_wrapper.ts
@@ -0,0 +1,33 @@
+import * as _ from 'lodash';
+import {Web3Wrapper} from '../web3_wrapper';
+import {ContractWrapper} from './contract_wrapper';
+import * as ProxyArtifacts from '../artifacts/Proxy.json';
+import {ProxyContract} from '../types';
+
+/**
+ * This class includes the functionality related to interacting with the Proxy contract.
+ */
+export class ProxyWrapper extends ContractWrapper {
+    private _proxyContractIfExists?: ProxyContract;
+    public invalidateContractInstance(): void {
+        delete this._proxyContractIfExists;
+    }
+    /**
+     * Check if the Exchange contract address is authorized by the Proxy contract.
+     * @param   exchangeContractAddress     The hex encoded address of the Exchange contract to use.
+     * @return  Whether the exchangeContractAddress is authorized.
+     */
+    public async isAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
+        const proxyContractInstance = await this._getProxyContractAsync();
+        const isAuthorized = await proxyContractInstance.authorized.call(exchangeContractAddress);
+        return isAuthorized;
+    }
+    private async _getProxyContractAsync(): Promise<ProxyContract> {
+        if (!_.isUndefined(this._proxyContractIfExists)) {
+            return this._proxyContractIfExists;
+        }
+        const contractInstance = await this._instantiateContractIfExistsAsync((ProxyArtifacts as any));
+        this._proxyContractIfExists = contractInstance as ProxyContract;
+        return this._proxyContractIfExists;
+    }
+}
diff --git a/src/exchange_artifacts_by_name.ts b/src/exchange_artifacts_by_name.ts
new file mode 100644
index 000000000..d5ae6e180
--- /dev/null
+++ b/src/exchange_artifacts_by_name.ts
@@ -0,0 +1,6 @@
+import {ContractArtifact} from './types';
+import * as Exchange_v1 from './artifacts/exchange/Exchange_v1.json';
+
+export const ExchangeArtifactsByName = {
+    Exchange_v1: Exchange_v1 as any as ContractArtifact,
+};
diff --git a/src/globals.d.ts b/src/globals.d.ts
index 4a0a3fb04..6a4e8d3a7 100644
--- a/src/globals.d.ts
+++ b/src/globals.d.ts
@@ -7,10 +7,6 @@ declare module 'request-promise-native';
 declare module 'web3-provider-engine';
 declare module 'web3-provider-engine/subproviders/rpc';
 
-declare interface Schema {
-    id: string;
-}
-
 // HACK: In order to merge the bignumber declaration added by chai-bignumber to the chai Assertion
 // interface we must use `namespace` as the Chai definitelyTyped definition does. Since we otherwise
 // disallow `namespace`, we disable tslint for the following.
diff --git a/src/types.ts b/src/types.ts
index 708695890..b7ee9c946 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -12,6 +12,7 @@ function strEnum(values: string[]): {[key: string]: string} {
 
 export const ZeroExError = strEnum([
     'CONTRACT_DOES_NOT_EXIST',
+    'EXCHANGE_CONTRACT_DOES_NOT_EXIST',
     'UNHANDLED_ERROR',
     'USER_HAS_NO_ASSOCIATED_ADDRESSES',
     'INVALID_SIGNATURE',
@@ -147,6 +148,12 @@ export interface EtherTokenContract extends ContractInstance {
     withdraw: (amount: BigNumber.BigNumber, txOpts: TxOpts) => Promise<void>;
 }
 
+export interface ProxyContract extends ContractInstance {
+    authorized: {
+        call: (address: string) => Promise<boolean>;
+    };
+}
+
 export const SolidityTypes = strEnum([
     'address',
     'uint256',
@@ -182,6 +189,7 @@ export const ExchangeContractErrs = strEnum([
     'MULTIPLE_MAKERS_IN_SINGLE_CANCEL_BATCH_DISALLOWED',
     'INSUFFICIENT_REMAINING_FILL_AMOUNT',
     'MULTIPLE_TAKER_TOKENS_IN_FILL_UP_TO_DISALLOWED',
+    'BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS',
 ]);
 export type ExchangeContractErrs = keyof typeof ExchangeContractErrs;
 
@@ -241,6 +249,7 @@ export interface Order {
     makerTokenAddress: string;
     takerTokenAddress: string;
     salt: BigNumber.BigNumber;
+    exchangeContractAddress: string;
     feeRecipient: string;
     expirationUnixTimestampSec: BigNumber.BigNumber;
 }
@@ -326,3 +335,15 @@ export interface ContractEventEmitter {
  * It is however a `Web3` library type, not a native `0x.js` type.
  */
 export type Web3Provider = Web3.Provider;
+
+export interface ExchangeContractByAddress {
+    [address: string]: ExchangeContract;
+}
+
+export interface ContractArtifact {
+    networks: {
+        [networkId: number]: {
+            address: string;
+        };
+    };
+}
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index 94b119d5a..38c1d4aae 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -2,6 +2,7 @@ import * as _ from 'lodash';
 import * as BigNumber from 'bignumber.js';
 import * as Web3 from 'web3';
 import {Web3Wrapper} from '../web3_wrapper';
+import {Schema} from 'jsonschema';
 import {SchemaValidator} from './schema_validator';
 import {utils} from './utils';
 
diff --git a/src/utils/schema_validator.ts b/src/utils/schema_validator.ts
index 9097dce88..e3f911adb 100644
--- a/src/utils/schema_validator.ts
+++ b/src/utils/schema_validator.ts
@@ -1,4 +1,4 @@
-import {Validator, ValidatorResult} from 'jsonschema';
+import {Validator, ValidatorResult,  Schema} from 'jsonschema';
 import {ecSignatureSchema, ecSignatureParameterSchema} from '../schemas/ec_signature_schema';
 import {orderSchema, signedOrderSchema} from '../schemas/order_schemas';
 import {addressSchema, numberSchema} from '../schemas/basic_type_schemas';
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index bad5b6498..061e9f99a 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -22,6 +22,9 @@ export const utils = {
     isParityNode(nodeVersion: string): boolean {
         return _.includes(nodeVersion, 'Parity');
     },
+    isTestRpc(nodeVersion: string): boolean {
+        return _.includes(nodeVersion, 'TestRPC');
+    },
     isValidOrderHash(orderHashHex: string): boolean {
         const isValid = /^0x[0-9A-F]{64}$/i.test(orderHashHex);
         return isValid;
@@ -29,9 +32,9 @@ export const utils = {
     spawnSwitchErr(name: string, value: any): Error {
         return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
     },
-    getOrderHashHex(order: Order|SignedOrder, exchangeContractAddr: string): string {
+    getOrderHashHex(order: Order|SignedOrder): string {
         const orderParts = [
-            {value: exchangeContractAddr, type: SolidityTypes.address},
+            {value: order.exchangeContractAddress, type: SolidityTypes.address},
             {value: order.maker, type: SolidityTypes.address},
             {value: order.taker, type: SolidityTypes.address},
             {value: order.makerTokenAddress, type: SolidityTypes.address},