3 files changed, 21 insertions, 6 deletions
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index 69fd3ba03..a8da05205 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -2,9 +2,12 @@ import BigNumber from 'bignumber.js';
 import * as Web3 from 'web3';
 
 export enum ZeroExError {
-    ContractDoesNotExist = 'CONTRACT_DOES_NOT_EXIST',
     ExchangeContractDoesNotExist = 'EXCHANGE_CONTRACT_DOES_NOT_EXIST',
     ZRXContractDoesNotExist = 'ZRX_CONTRACT_DOES_NOT_EXIST',
+    EtherTokenContractDoesNotExist = 'ETHER_TOKEN_CONTRACT_DOES_NOT_EXIST',
+    TokenTransferProxyContractDoesNotExist = 'TOKEN_TRANSFER_PROXY_CONTRACT_DOES_NOT_EXIST',
+    TokenRegistryContractDoesNotExist = 'TOKEN_REGISTRY_CONTRACT_DOES_NOT_EXIST',
+    TokenContractDoesNotExist = 'TOKEN_CONTRACT_DOES_NOT_EXIST',
     UnhandledError = 'UNHANDLED_ERROR',
     UserHasNoAssociatedAddress = 'USER_HAS_NO_ASSOCIATED_ADDRESSES',
     InvalidSignature = 'INVALID_SIGNATURE',
@@ -443,7 +446,10 @@ export interface TransactionReceiptWithDecodedLogs extends TransactionReceipt {
     logs: Array<LogWithDecodedArgs<DecodedLogArgs>|Web3.LogEntry>;
 }
 
+export type ArtifactContractName = 'ZRX'|'TokenTransferProxy'|'TokenRegistry'|'Token'|'Exchange'|'EtherToken';
+
 export interface Artifact {
+    contract_name: ArtifactContractName;
     abi: Web3.ContractAbi;
     networks: {
         [networkId: number]: {
diff --git a/packages/0x.js/src/web3_wrapper.ts b/packages/0x.js/src/web3_wrapper.ts
index 557cd28e5..a031de486 100644
--- a/packages/0x.js/src/web3_wrapper.ts
+++ b/packages/0x.js/src/web3_wrapper.ts
@@ -4,7 +4,7 @@ import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
 import {Contract} from './contract';
-import {Artifact, TransactionReceipt, ZeroExError} from './types';
+import {Artifact, ArtifactContractName, TransactionReceipt, ZeroExError} from './types';
 
 interface RawLogEntry {
     logIndex: string|null;
@@ -17,6 +17,15 @@ interface RawLogEntry {
     topics: string[];
 }
 
+const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {[contractName: string]: ZeroExError} = {
+    ZRX: ZeroExError.ZRXContractDoesNotExist,
+    EtherToken: ZeroExError.EtherTokenContractDoesNotExist,
+    Token: ZeroExError.TokenContractDoesNotExist,
+    TokenRegistry: ZeroExError.TokenRegistryContractDoesNotExist,
+    TokenTransferProxy: ZeroExError.TokenTransferProxyContractDoesNotExist,
+    Exchange: ZeroExError.ExchangeContractDoesNotExist,
+};
+
 export class Web3Wrapper {
     private web3: Web3;
     private networkId: number;
@@ -77,7 +86,7 @@ export class Web3Wrapper {
         }
         const doesContractExist = await this.doesContractExistAtAddressAsync(contractAddress);
         if (!doesContractExist) {
-            throw new Error(ZeroExError.ContractDoesNotExist);
+            throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contract_name]);
         }
         const contractInstance = this.getContractInstance<A>(
             artifact.abi, contractAddress,
diff --git a/packages/0x.js/test/token_wrapper_test.ts b/packages/0x.js/test/token_wrapper_test.ts
index abd4243c3..d0ca0144a 100644
--- a/packages/0x.js/test/token_wrapper_test.ts
+++ b/packages/0x.js/test/token_wrapper_test.ts
@@ -86,7 +86,7 @@ describe('TokenWrapper', () => {
             const toAddress = coinbase;
             return expect(zeroEx.token.transferAsync(
                 nonExistentTokenAddress, fromAddress, toAddress, transferAmount,
-            )).to.be.rejectedWith(ZeroExError.ContractDoesNotExist);
+            )).to.be.rejectedWith(ZeroExError.TokenContractDoesNotExist);
         });
     });
     describe('#transferFromAsync', () => {
@@ -159,7 +159,7 @@ describe('TokenWrapper', () => {
             const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
             return expect(zeroEx.token.transferFromAsync(
                 nonExistentTokenAddress, fromAddress, toAddress, senderAddress, new BigNumber(42),
-            )).to.be.rejectedWith(ZeroExError.ContractDoesNotExist);
+            )).to.be.rejectedWith(ZeroExError.TokenContractDoesNotExist);
         });
     });
     describe('#getBalanceAsync', () => {
@@ -175,7 +175,7 @@ describe('TokenWrapper', () => {
                 const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
                 const ownerAddress = coinbase;
                 return expect(zeroEx.token.getBalanceAsync(nonExistentTokenAddress, ownerAddress))
-                    .to.be.rejectedWith(ZeroExError.ContractDoesNotExist);
+                    .to.be.rejectedWith(ZeroExError.TokenContractDoesNotExist);
             });
             it('should return a balance of 0 for a non-existent owner address', async () => {
                 const token = tokens[0];