Merge branch 'development' into feature/sra-reporter

* development: (71 commits)
  Set max to 2 ETH/2 ZRX
  Add missing types from website
  Add dependencies
  Update the README
  Move BaseContract to its own package
  Upgrate prettier
  remove unused import
  Move more configs into docsInfo and remove logic that does not belong there elsewhere
  Fix a bug with displaying solidity functions returning multiple return values
  Add ethers-contracts as a dependency
  Include types for ethers-contracts
  Fix the version
  Include types for ethers-contracts
  Rename idx to i
  Remove tslint disable
  Move BaseContract to web3Wrapper
  Merge ifs
  Fix an option description
  Add link to the docs
  Improve CHANGELOG entry
  ...

131 files changed, 1367 insertions, 801 deletions

diff --git a/.prettierignore b/.prettierignore
index c3738481a..385c15654 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,5 +1,4 @@
 lib
-generated
 .nyc_output
 /packages/contracts/src/artifacts
 package.json
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e8828ff6b..2bb71e855 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,9 +8,9 @@ If you'd like to contribute to 0x protocol, please fork the repo, fix, commit an
 
 We encourage a “PR early” approach so create the PR as early as possible even without the fix/feature ready, so that devs and other contributors know you have picked up the issue. These early PRs should indicate an 'in progress' status by adding the '[WIP]' prefix to the PR title. Please make sure your contributions adhere to our coding guidelines:
 
-* Pull requests adding features or refactoring should be opened against the `development` branch
-* Pull requests fixing bugs in the latest release version should be opened again the `master` branch
-* Write [good commit messages](https://chris.beams.io/posts/git-commit/)
+*   Pull requests adding features or refactoring should be opened against the `development` branch
+*   Pull requests fixing bugs in the latest release version should be opened again the `master` branch
+*   Write [good commit messages](https://chris.beams.io/posts/git-commit/)
 
 ### Code quality
 
@@ -31,10 +31,10 @@ We also use [Prettier](https://prettier.io/) to auto-format our code. Be sure to
 
 If using the Atom text editor, we recommend you install the following packages:
 
-* [atom-typescript](https://atom.io/packages/atom-typescript)
-* [linter-tslint](https://atom.io/packages/linter-tslint)
-* [prettier-atom](https://atom.io/packages/prettier-atom)
-* [language-ethereum](https://atom.io/packages/language-ethereum)
+*   [atom-typescript](https://atom.io/packages/atom-typescript)
+*   [linter-tslint](https://atom.io/packages/linter-tslint)
+*   [prettier-atom](https://atom.io/packages/prettier-atom)
+*   [language-ethereum](https://atom.io/packages/language-ethereum)
 
 Our CI will also run TSLint and Prettier as a part of the test run when you submit your PR. Make sure that the CI tests pass for your contribution.
 
diff --git a/PULL_REQUEST_TEMPLATE.md b/PULL_REQUEST_TEMPLATE.md
index 96eae1691..481b1d536 100644
--- a/PULL_REQUEST_TEMPLATE.md
+++ b/PULL_REQUEST_TEMPLATE.md
@@ -24,9 +24,9 @@
 
 <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
 
-* [ ] Bug fix (non-breaking change which fixes an issue)
-* [ ] New feature (non-breaking change which adds functionality)
-* [ ] Breaking change (fix or feature that would cause existing functionality to change)
+*   [ ] Bug fix (non-breaking change which fixes an issue)
+*   [ ] New feature (non-breaking change which adds functionality)
+*   [ ] Breaking change (fix or feature that would cause existing functionality to change)
 
 ## Checklist:
 
@@ -34,9 +34,9 @@
 
 <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 
-* [ ] Change requires a change to the documentation.
-* [ ] Added tests to cover my changes.
-* [ ] Added new entries to the relevant CHANGELOGs.
-* [ ] Updated the new versions of the changed packages in the relevant CHANGELOGs.
-* [ ] Labeled this PR with the 'WIP' label if it is a work in progress.
-* [ ] Labeled this PR with the labels corresponding to the changed package.
+*   [ ] Change requires a change to the documentation.
+*   [ ] Added tests to cover my changes.
+*   [ ] Added new entries to the relevant CHANGELOGs.
+*   [ ] Updated the new versions of the changed packages in the relevant CHANGELOGs.
+*   [ ] Labeled this PR with the 'WIP' label if it is a work in progress.
+*   [ ] Labeled this PR with the labels corresponding to the changed package.
diff --git a/README.md b/README.md
index 775f7cdf3..8ade618b5 100644
--- a/README.md
+++ b/README.md
@@ -48,10 +48,10 @@ This repository contains all the 0x developer tools written in TypeScript. Our h
 
 Dedicated documentation pages:
 
-* [0x.js Library](https://0xproject.com/docs/0xjs)
-* [0x Connect](https://0xproject.com/docs/connect)
-* [Smart contracts](https://0xproject.com/docs/contracts)
-* [Standard Relayer API](https://github.com/0xProject/standard-relayer-api/blob/master/README.md)
+*   [0x.js Library](https://0xproject.com/docs/0xjs)
+*   [0x Connect](https://0xproject.com/docs/connect)
+*   [Smart contracts](https://0xproject.com/docs/contracts)
+*   [Standard Relayer API](https://github.com/0xProject/standard-relayer-api/blob/master/README.md)
 
 ## Contributing
 
diff --git a/package.json b/package.json
index 9c3825822..e130cbcc8 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
         "async-child-process": "^1.1.1",
         "ethereumjs-testrpc": "^6.0.3",
         "lerna": "^2.5.1",
-        "prettier": "1.9.2",
+        "prettier": "^1.11.0",
         "publish-release": "0xproject/publish-release",
         "semver-sort": "^0.0.4"
     }
diff --git a/packages/0x.js/CHANGELOG.md b/packages/0x.js/CHANGELOG.md
index 0af474c74..b882a1b31 100644
--- a/packages/0x.js/CHANGELOG.md
+++ b/packages/0x.js/CHANGELOG.md
@@ -1,5 +1,12 @@
 # CHANGELOG
 
+## v0.33.0 - _TBD, 2018_
+
+    * Validate and lowercase all addresses in public methods (#373)
+    * Improve validation to force passing contract addresses on private networks (#385)
+    * Change `LogErrorContractEventArgs.errorId` type from `BigNumber` to `number` (#413)
+    * Rename all public `_unsubscribeAll` methods to `unsubscribeAll` (#415)
+
 ## v0.32.2 - _February 9, 2018_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/0x.js/contract_templates/partials/call.handlebars b/packages/0x.js/contract_templates/partials/call.handlebars
deleted file mode 100644
index 0475136f0..000000000
--- a/packages/0x.js/contract_templates/partials/call.handlebars
+++ /dev/null
@@ -1,15 +0,0 @@
-public {{this.name}} = {
-    async callAsync(
-    {{> typed_params inputs=inputs}}
-        defaultBlock?: Web3.BlockParam,
-    ): Promise<{{> return_type outputs=outputs}}> {
-        const self = this as {{contractName}}Contract;
-        const result = await promisify<{{> return_type outputs=outputs}}>(
-            self._web3ContractInstance.{{this.name}}.call,
-            self._web3ContractInstance,
-        )(
-            {{> params inputs=inputs}}
-        );
-        return result;
-    },
-};
diff --git a/packages/0x.js/contract_templates/partials/return_type.handlebars b/packages/0x.js/contract_templates/partials/return_type.handlebars
deleted file mode 100644
index 383961a40..000000000
--- a/packages/0x.js/contract_templates/partials/return_type.handlebars
+++ /dev/null
@@ -1,6 +0,0 @@
-{{#singleReturnValue}}
-{{#returnType outputs.0.type}}{{/returnType}}
-{{/singleReturnValue}}
-{{^singleReturnValue}}
-[{{#each outputs}}{{#returnType type}}{{/returnType}}{{#unless @last}}, {{/unless}}{{/each}}]
-{{/singleReturnValue}}
diff --git a/packages/0x.js/contract_templates/partials/typed_params.handlebars b/packages/0x.js/contract_templates/partials/typed_params.handlebars
deleted file mode 100644
index 3ea4b2e95..000000000
--- a/packages/0x.js/contract_templates/partials/typed_params.handlebars
+++ /dev/null
@@ -1,3 +0,0 @@
-{{#each inputs}}
-    {{name}}: {{#parameterType type}}{{/parameterType}},
-{{/each}}
diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index 4fb0eb6ac..20af430d6 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -17,7 +17,7 @@
         "build": "run-p build:umd:prod build:commonjs; exit 0;",
         "docs:json": "typedoc --excludePrivate --excludeExternals --target ES5 --json $JSON_FILE_PATH $PROJECT_DIR",
         "upload_docs_json": "aws s3 cp generated_docs/index.json $S3_URL --profile 0xproject --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers --content-type application/json",
-        "generate_contract_wrappers": "node ../abi-gen/lib/index.js --abis 'src/artifacts/@(Exchange|Token|TokenTransferProxy|EtherToken|TokenRegistry|DummyToken).json' --template contract_templates/contract.handlebars --partials 'contract_templates/partials/**/*.handlebars' --output src/contract_wrappers/generated",
+        "generate_contract_wrappers": "node ../abi-gen/lib/index.js --abis 'src/artifacts/@(Exchange|Token|TokenTransferProxy|EtherToken|TokenRegistry|DummyToken).json' --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/contract_wrappers/generated --backend ethers && prettier --write 'src/contract_wrappers/generated/**.ts'",
         "lint": "tslint --project . 'src/**/*.ts' 'test/**/*.ts'",
         "test:circleci": "run-s test:coverage report_test_coverage",
         "test": "run-s clean test:commonjs",
@@ -77,17 +77,20 @@
         "types-bn": "^0.0.1",
         "typescript": "2.7.1",
         "web3-provider-engine": "^13.0.1",
+        "ethers-typescript-typings": "^0.0.1",
         "web3-typescript-typings": "^0.9.11",
         "webpack": "^3.1.0"
     },
     "dependencies": {
         "@0xproject/assert": "^0.0.20",
+        "@0xproject/base-contract": "^0.0.1",
         "@0xproject/json-schemas": "^0.7.12",
         "@0xproject/types": "^0.2.3",
         "@0xproject/utils": "^0.3.4",
         "@0xproject/web3-wrapper": "^0.1.14",
         "bintrees": "^1.0.2",
         "bn.js": "^4.11.8",
+        "ethers-contracts": "^2.2.1",
         "ethereumjs-abi": "^0.6.4",
         "ethereumjs-blockstream": "^2.0.6",
         "ethereumjs-util": "^5.1.1",
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index 6cfa65cc2..22a5fee10 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -13,6 +13,8 @@ import { TokenTransferProxyWrapper } from './contract_wrappers/token_transfer_pr
 import { TokenWrapper } from './contract_wrappers/token_wrapper';
 import { OrderStateWatcher } from './order_watcher/order_state_watcher';
 import { zeroExConfigSchema } from './schemas/zero_ex_config_schema';
+import { zeroExPrivateNetworkConfigSchema } from './schemas/zero_ex_private_network_config_schema';
+import { zeroExPublicNetworkConfigSchema } from './schemas/zero_ex_public_network_config_schema';
 import { ECSignature, Order, SignedOrder, Web3Provider, ZeroExConfig, ZeroExError } from './types';
 import { assert } from './utils/assert';
 import { constants } from './utils/constants';
@@ -74,8 +76,9 @@ export class ZeroEx {
         assert.isHexString('data', data);
         assert.doesConformToSchema('signature', signature, schemas.ecSignatureSchema);
         assert.isETHAddressHex('signerAddress', signerAddress);
+        const normalizedSignerAddress = signerAddress.toLowerCase();
 
-        const isValidSignature = signatureUtils.isValidSignature(data, signature, signerAddress);
+        const isValidSignature = signatureUtils.isValidSignature(data, signature, normalizedSignerAddress);
         return isValidSignature;
     }
     /**
@@ -163,7 +166,10 @@ export class ZeroEx {
      */
     constructor(provider: Web3Provider, config: ZeroExConfig) {
         assert.isWeb3Provider('provider', provider);
-        assert.doesConformToSchema('config', config, zeroExConfigSchema);
+        assert.doesConformToSchema('config', config, zeroExConfigSchema, [
+            zeroExPrivateNetworkConfigSchema,
+            zeroExPublicNetworkConfigSchema,
+        ]);
         const artifactJSONs = _.values(artifacts);
         const abiArrays = _.map(artifactJSONs, artifact => artifact.abi);
         this._abiDecoder = new AbiDecoder(abiArrays);
@@ -245,6 +251,7 @@ export class ZeroEx {
     ): Promise<ECSignature> {
         assert.isHexString('orderHash', orderHash);
         await assert.isSenderAddressAsync('signerAddress', signerAddress, this._web3Wrapper);
+        const normalizedSignerAddress = signerAddress.toLowerCase();
 
         let msgHashHex = orderHash;
         if (shouldAddPersonalMessagePrefix) {
@@ -253,7 +260,7 @@ export class ZeroEx {
             msgHashHex = ethUtil.bufferToHex(msgHashBuff);
         }
 
-        const signature = await this._web3Wrapper.signTransactionAsync(signerAddress, msgHashHex);
+        const signature = await this._web3Wrapper.signTransactionAsync(normalizedSignerAddress, msgHashHex);
 
         // HACK: There is no consensus on whether the signatureHex string should be formatted as
         // v + r + s OR r + s + v, and different clients (even different versions of the same client)
@@ -262,7 +269,7 @@ export class ZeroEx {
         const validVParamValues = [27, 28];
         const ecSignatureVRS = signatureUtils.parseSignatureHexAsVRS(signature);
         if (_.includes(validVParamValues, ecSignatureVRS.v)) {
-            const isValidVRSSignature = ZeroEx.isValidSignature(orderHash, ecSignatureVRS, signerAddress);
+            const isValidVRSSignature = ZeroEx.isValidSignature(orderHash, ecSignatureVRS, normalizedSignerAddress);
             if (isValidVRSSignature) {
                 return ecSignatureVRS;
             }
@@ -270,7 +277,7 @@ export class ZeroEx {
 
         const ecSignatureRSV = signatureUtils.parseSignatureHexAsRSV(signature);
         if (_.includes(validVParamValues, ecSignatureRSV.v)) {
-            const isValidRSVSignature = ZeroEx.isValidSignature(orderHash, ecSignatureRSV, signerAddress);
+            const isValidRSVSignature = ZeroEx.isValidSignature(orderHash, ecSignatureRSV, normalizedSignerAddress);
             if (isValidRSVSignature) {
                 return ecSignatureRSV;
             }
diff --git a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
index b313273b5..ad7727de5 100644
--- a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
@@ -108,10 +108,10 @@ export class ContractWrapper {
         const logWithDecodedArgs = this._abiDecoder.tryToDecodeLogOrNoop(log);
         return logWithDecodedArgs;
     }
-    protected async _instantiateContractIfExistsAsync(
+    protected async _getContractAbiAndAddressFromArtifactsAsync(
         artifact: Artifact,
         addressIfExists?: string,
-    ): Promise<Web3.ContractInstance> {
+    ): Promise<[Web3.ContractAbi, string]> {
         let contractAddress: string;
         if (_.isUndefined(addressIfExists)) {
             if (_.isUndefined(artifact.networks[this._networkId])) {
@@ -125,8 +125,8 @@ export class ContractWrapper {
         if (!doesContractExist) {
             throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contract_name]);
         }
-        const contractInstance = this._web3Wrapper.getContractInstance(artifact.abi, contractAddress);
-        return contractInstance;
+        const abiAndAddress: [Web3.ContractAbi, string] = [artifact.abi, contractAddress];
+        return abiAndAddress;
     }
     protected _getContractAddress(artifact: Artifact, addressIfExists?: string): string {
         if (_.isUndefined(addressIfExists)) {
diff --git a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
index db7cdee43..42f8213a2 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -41,15 +41,18 @@ export class EtherTokenWrapper extends ContractWrapper {
         depositor: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
         assert.isValidBaseUnitAmount('amountInWei', amountInWei);
         await assert.isSenderAddressAsync('depositor', depositor, this._web3Wrapper);
+        const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
+        const normalizedDepositorAddress = depositor.toLowerCase();
 
-        const ethBalanceInWei = await this._web3Wrapper.getBalanceInWeiAsync(depositor);
+        const ethBalanceInWei = await this._web3Wrapper.getBalanceInWeiAsync(normalizedDepositorAddress);
         assert.assert(ethBalanceInWei.gte(amountInWei), ZeroExError.InsufficientEthBalanceForDeposit);
 
-        const wethContract = await this._getEtherTokenContractAsync(etherTokenAddress);
+        const wethContract = await this._getEtherTokenContractAsync(normalizedEtherTokenAddress);
         const txHash = await wethContract.deposit.sendTransactionAsync({
-            from: depositor,
+            from: normalizedDepositorAddress,
             value: amountInWei,
             gas: txOpts.gasLimit,
             gasPrice: txOpts.gasPrice,
@@ -72,14 +75,20 @@ export class EtherTokenWrapper extends ContractWrapper {
         txOpts: TransactionOpts = {},
     ): Promise<string> {
         assert.isValidBaseUnitAmount('amountInWei', amountInWei);
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
         await assert.isSenderAddressAsync('withdrawer', withdrawer, this._web3Wrapper);
+        const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
+        const normalizedWithdrawerAddress = withdrawer.toLowerCase();
 
-        const WETHBalanceInBaseUnits = await this._tokenWrapper.getBalanceAsync(etherTokenAddress, withdrawer);
+        const WETHBalanceInBaseUnits = await this._tokenWrapper.getBalanceAsync(
+            normalizedEtherTokenAddress,
+            normalizedWithdrawerAddress,
+        );
         assert.assert(WETHBalanceInBaseUnits.gte(amountInWei), ZeroExError.InsufficientWEthBalanceForWithdrawal);
 
-        const wethContract = await this._getEtherTokenContractAsync(etherTokenAddress);
+        const wethContract = await this._getEtherTokenContractAsync(normalizedEtherTokenAddress);
         const txHash = await wethContract.withdraw.sendTransactionAsync(amountInWei, {
-            from: withdrawer,
+            from: normalizedWithdrawerAddress,
             gas: txOpts.gasLimit,
             gasPrice: txOpts.gasPrice,
         });
@@ -101,11 +110,12 @@ export class EtherTokenWrapper extends ContractWrapper {
         indexFilterValues: IndexedFilterValues,
     ): Promise<Array<LogWithDecodedArgs<ArgsType>>> {
         assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
+        const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
         assert.doesBelongToStringEnum('eventName', eventName, EtherTokenEvents);
         assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         const logs = await this._getLogsAsync<ArgsType>(
-            etherTokenAddress,
+            normalizedEtherTokenAddress,
             eventName,
             blockRange,
             indexFilterValues,
@@ -129,11 +139,12 @@ export class EtherTokenWrapper extends ContractWrapper {
         callback: EventCallback<ArgsType>,
     ): string {
         assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
+        const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
         assert.doesBelongToStringEnum('eventName', eventName, EtherTokenEvents);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         assert.isFunction('callback', callback);
         const subscriptionToken = this._subscribe<ArgsType>(
-            etherTokenAddress,
+            normalizedEtherTokenAddress,
             eventName,
             indexFilterValues,
             artifacts.EtherTokenArtifact.abi,
@@ -151,7 +162,7 @@ export class EtherTokenWrapper extends ContractWrapper {
     /**
      * Cancels all existing subscriptions
      */
-    public _unsubscribeAll(): void {
+    public unsubscribeAll(): void {
         super._unsubscribeAll();
     }
     /**
@@ -168,7 +179,7 @@ export class EtherTokenWrapper extends ContractWrapper {
         return contractAddressIfExists;
     }
     private _invalidateContractInstance(): void {
-        this._unsubscribeAll();
+        this.unsubscribeAll();
         this._etherTokenContractsByAddress = {};
     }
     private async _getEtherTokenContractAsync(etherTokenAddress: string): Promise<EtherTokenContract> {
@@ -176,11 +187,11 @@ export class EtherTokenWrapper extends ContractWrapper {
         if (!_.isUndefined(etherTokenContract)) {
             return etherTokenContract;
         }
-        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
+        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
             artifacts.EtherTokenArtifact,
             etherTokenAddress,
         );
-        const contractInstance = new EtherTokenContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
+        const contractInstance = new EtherTokenContract(this._web3Wrapper, abi, address);
         etherTokenContract = contractInstance;
         this._etherTokenContractsByAddress[etherTokenAddress] = etherTokenContract;
         return etherTokenContract;
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index c82b7ecf5..20b46c6bc 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -108,8 +108,10 @@ export class ExchangeWrapper extends ContractWrapper {
 
         const exchangeContract = await this._getExchangeContractAsync();
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
+        const txData = {};
         let unavailableTakerTokenAmount = await exchangeContract.getUnavailableTakerTokenAmount.callAsync(
             orderHash,
+            txData,
             defaultBlock,
         );
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
@@ -127,7 +129,8 @@ export class ExchangeWrapper extends ContractWrapper {
 
         const exchangeContract = await this._getExchangeContractAsync();
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
-        let fillAmountInBaseUnits = await exchangeContract.filled.callAsync(orderHash, defaultBlock);
+        const txData = {};
+        let fillAmountInBaseUnits = await exchangeContract.filled.callAsync(orderHash, txData, defaultBlock);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         fillAmountInBaseUnits = new BigNumber(fillAmountInBaseUnits);
         return fillAmountInBaseUnits;
@@ -144,7 +147,8 @@ export class ExchangeWrapper extends ContractWrapper {
 
         const exchangeContract = await this._getExchangeContractAsync();
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
-        let cancelledAmountInBaseUnits = await exchangeContract.cancelled.callAsync(orderHash, defaultBlock);
+        const txData = {};
+        let cancelledAmountInBaseUnits = await exchangeContract.cancelled.callAsync(orderHash, txData, defaultBlock);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         cancelledAmountInBaseUnits = new BigNumber(cancelledAmountInBaseUnits);
         return cancelledAmountInBaseUnits;
@@ -180,6 +184,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
 
         const exchangeInstance = await this._getExchangeContractAsync();
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
@@ -192,7 +197,7 @@ export class ExchangeWrapper extends ContractWrapper {
                 exchangeTradeEmulator,
                 signedOrder,
                 fillTakerTokenAmount,
-                takerAddress,
+                normalizedTakerAddress,
                 zrxTokenAddress,
             );
         }
@@ -208,7 +213,7 @@ export class ExchangeWrapper extends ContractWrapper {
             signedOrder.ecSignature.r,
             signedOrder.ecSignature.s,
             {
-                from: takerAddress,
+                from: normalizedTakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -254,6 +259,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
 
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
             ? SHOULD_VALIDATE_BY_DEFAULT
@@ -267,7 +273,7 @@ export class ExchangeWrapper extends ContractWrapper {
                     exchangeTradeEmulator,
                     signedOrder,
                     fillTakerTokenAmount.minus(filledTakerTokenAmount),
-                    takerAddress,
+                    normalizedTakerAddress,
                     zrxTokenAddress,
                 );
                 filledTakerTokenAmount = filledTakerTokenAmount.plus(singleFilledTakerTokenAmount);
@@ -301,7 +307,7 @@ export class ExchangeWrapper extends ContractWrapper {
             rArray,
             sArray,
             {
-                from: takerAddress,
+                from: normalizedTakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -345,6 +351,7 @@ export class ExchangeWrapper extends ContractWrapper {
         );
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
             ? SHOULD_VALIDATE_BY_DEFAULT
             : orderTransactionOpts.shouldValidate;
@@ -356,7 +363,7 @@ export class ExchangeWrapper extends ContractWrapper {
                     exchangeTradeEmulator,
                     orderFillRequest.signedOrder,
                     orderFillRequest.takerTokenFillAmount,
-                    takerAddress,
+                    normalizedTakerAddress,
                     zrxTokenAddress,
                 );
             }
@@ -389,7 +396,7 @@ export class ExchangeWrapper extends ContractWrapper {
             rArray,
             sArray,
             {
-                from: takerAddress,
+                from: normalizedTakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -417,6 +424,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
 
         const exchangeInstance = await this._getExchangeContractAsync();
 
@@ -430,7 +438,7 @@ export class ExchangeWrapper extends ContractWrapper {
                 exchangeTradeEmulator,
                 signedOrder,
                 fillTakerTokenAmount,
-                takerAddress,
+                normalizedTakerAddress,
                 zrxTokenAddress,
             );
         }
@@ -444,7 +452,7 @@ export class ExchangeWrapper extends ContractWrapper {
             signedOrder.ecSignature.r,
             signedOrder.ecSignature.s,
             {
-                from: takerAddress,
+                from: normalizedTakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -476,6 +484,7 @@ export class ExchangeWrapper extends ContractWrapper {
             ExchangeContractErrs.BatchOrdersMustHaveSameExchangeAddress,
         );
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
         if (_.isEmpty(orderFillRequests)) {
             throw new Error(ExchangeContractErrs.BatchOrdersMustHaveAtLeastOneItem);
         }
@@ -492,7 +501,7 @@ export class ExchangeWrapper extends ContractWrapper {
                     exchangeTradeEmulator,
                     orderFillRequest.signedOrder,
                     orderFillRequest.takerTokenFillAmount,
-                    takerAddress,
+                    normalizedTakerAddress,
                     zrxTokenAddress,
                 );
             }
@@ -520,7 +529,7 @@ export class ExchangeWrapper extends ContractWrapper {
             rParams,
             sParams,
             {
-                from: takerAddress,
+                from: normalizedTakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -544,6 +553,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesConformToSchema('order', order, schemas.orderSchema);
         assert.isValidBaseUnitAmount('takerTokenCancelAmount', cancelTakerTokenAmount);
         await assert.isSenderAddressAsync('order.maker', order.maker, this._web3Wrapper);
+        const normalizedMakerAddress = order.maker.toLowerCase();
 
         const exchangeInstance = await this._getExchangeContractAsync();
 
@@ -566,7 +576,7 @@ export class ExchangeWrapper extends ContractWrapper {
             orderValues,
             cancelTakerTokenAmount,
             {
-                from: order.maker,
+                from: normalizedMakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -603,6 +613,8 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.hasAtMostOneUniqueValue(makers, ExchangeContractErrs.MultipleMakersInSingleCancelBatchDisallowed);
         const maker = makers[0];
         await assert.isSenderAddressAsync('maker', maker, this._web3Wrapper);
+        const normalizedMakerAddress = maker.toLowerCase();
+
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
             ? SHOULD_VALIDATE_BY_DEFAULT
             : orderTransactionOpts.shouldValidate;
@@ -636,7 +648,7 @@ export class ExchangeWrapper extends ContractWrapper {
             orderValues,
             cancelTakerTokenAmounts,
             {
-                from: maker,
+                from: normalizedMakerAddress,
                 gas: orderTransactionOpts.gasLimit,
                 gasPrice: orderTransactionOpts.gasPrice,
             },
@@ -679,7 +691,7 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Cancels all existing subscriptions
      */
-    public _unsubscribeAll(): void {
+    public unsubscribeAll(): void {
         super._unsubscribeAll();
     }
     /**
@@ -757,13 +769,14 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
         const zrxTokenAddress = this.getZRXTokenAddress();
         const exchangeTradeEmulator = new ExchangeTransferSimulator(this._tokenWrapper, BlockParamLiteral.Latest);
         await this._orderValidationUtils.validateFillOrderThrowIfInvalidAsync(
             exchangeTradeEmulator,
             signedOrder,
             fillTakerTokenAmount,
-            takerAddress,
+            normalizedTakerAddress,
             zrxTokenAddress,
         );
     }
@@ -803,13 +816,14 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
+        const normalizedTakerAddress = takerAddress.toLowerCase();
         const zrxTokenAddress = this.getZRXTokenAddress();
         const exchangeTradeEmulator = new ExchangeTransferSimulator(this._tokenWrapper, BlockParamLiteral.Latest);
         await this._orderValidationUtils.validateFillOrKillOrderThrowIfInvalidAsync(
             exchangeTradeEmulator,
             signedOrder,
             fillTakerTokenAmount,
-            takerAddress,
+            normalizedTakerAddress,
             zrxTokenAddress,
         );
     }
@@ -848,7 +862,7 @@ export class ExchangeWrapper extends ContractWrapper {
         });
         if (!_.isUndefined(errLog)) {
             const logArgs = (errLog as LogWithDecodedArgs<LogErrorContractEventArgs>).args;
-            const errCode = logArgs.errorId.toNumber();
+            const errCode = logArgs.errorId;
             const errMessage = this._exchangeContractErrCodesToMsg[errCode];
             throw new Error(errMessage);
         }
@@ -862,7 +876,7 @@ export class ExchangeWrapper extends ContractWrapper {
         return contractAddress;
     }
     private _invalidateContractInstances(): void {
-        this._unsubscribeAll();
+        this.unsubscribeAll();
         delete this._exchangeContractIfExists;
     }
     private async _isValidSignatureUsingContractCallAsync(
@@ -873,11 +887,12 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isHexString('dataHex', dataHex);
         assert.doesConformToSchema('ecSignature', ecSignature, schemas.ecSignatureSchema);
         assert.isETHAddressHex('signerAddressHex', signerAddressHex);
+        const normalizedSignerAddress = signerAddressHex.toLowerCase();
 
         const exchangeInstance = await this._getExchangeContractAsync();
 
         const isValidSignature = await exchangeInstance.isValidSignature.callAsync(
-            signerAddressHex,
+            normalizedSignerAddress,
             dataHex,
             ecSignature.v,
             ecSignature.r,
@@ -895,11 +910,11 @@ export class ExchangeWrapper extends ContractWrapper {
         if (!_.isUndefined(this._exchangeContractIfExists)) {
             return this._exchangeContractIfExists;
         }
-        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
+        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
             artifacts.ExchangeArtifact,
             this._contractAddressIfExists,
         );
-        const contractInstance = new ExchangeContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
+        const contractInstance = new ExchangeContract(this._web3Wrapper, abi, address);
         this._exchangeContractIfExists = contractInstance;
         return this._exchangeContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/generated/.gitignore b/packages/0x.js/src/contract_wrappers/generated/.gitignore
index 834808b48..72e8ffc0d 100644
--- a/packages/0x.js/src/contract_wrappers/generated/.gitignore
+++ b/packages/0x.js/src/contract_wrappers/generated/.gitignore
@@ -1,6 +1 @@
-dummy_token.ts
-ether_token.ts
-exchange.ts
-token_registry.ts
-token_transfer_proxy.ts
-token.ts
+*
diff --git a/packages/0x.js/src/contract_wrappers/generated/base_contract.ts b/packages/0x.js/src/contract_wrappers/generated/base_contract.ts
deleted file mode 100644
index d8fac7eea..000000000
--- a/packages/0x.js/src/contract_wrappers/generated/base_contract.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import {TxData, TxDataPayable} from '@0xproject/types';
-import * as _ from 'lodash';
-import * as Web3 from 'web3';
-
-export class BaseContract {
-    protected _web3ContractInstance: Web3.ContractInstance;
-    protected _defaults: Partial<TxData>;
-    protected async _applyDefaultsToTxDataAsync<T extends TxData|TxDataPayable>(
-        txData: T,
-        estimateGasAsync?: (txData: T) => Promise<number>,
-    ): Promise<TxData> {
-        // Gas amount sourced with the following priorities:
-        // 1. Optional param passed in to public method call
-        // 2. Global config passed in at library instantiation
-        // 3. Gas estimate calculation + safety margin
-        const removeUndefinedProperties = _.pickBy;
-        const txDataWithDefaults = {
-            ...removeUndefinedProperties(this._defaults),
-            ...removeUndefinedProperties(txData as any),
-            // HACK: TS can't prove that T is spreadable.
-            // Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
-        };
-        if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
-            const estimatedGas = await estimateGasAsync(txData);
-            txDataWithDefaults.gas = estimatedGas;
-        }
-        return txDataWithDefaults;
-    }
-    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
-        this._web3ContractInstance = web3ContractInstance;
-        this._defaults = defaults;
-    }
-}
diff --git a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
index f54aaf0f8..e1806c6f2 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -23,7 +23,7 @@ export class TokenRegistryWrapper extends ContractWrapper {
             address: metadata[0],
             name: metadata[1],
             symbol: metadata[2],
-            decimals: metadata[3].toNumber(),
+            decimals: metadata[3],
         };
         return token;
     }
@@ -50,7 +50,8 @@ export class TokenRegistryWrapper extends ContractWrapper {
     public async getTokenAddressesAsync(): Promise<string[]> {
         const tokenRegistryContract = await this._getTokenRegistryContractAsync();
         const addresses = await tokenRegistryContract.getTokenAddresses.callAsync();
-        return addresses;
+        const lowerCaseAddresses = _.map(addresses, address => address.toLowerCase());
+        return lowerCaseAddresses;
     }
     /**
      * Retrieves a token by address currently listed in the Token Registry smart contract
@@ -58,9 +59,10 @@ export class TokenRegistryWrapper extends ContractWrapper {
      */
     public async getTokenIfExistsAsync(address: string): Promise<Token | undefined> {
         assert.isETHAddressHex('address', address);
+        const normalizedAddress = address.toLowerCase();
 
         const tokenRegistryContract = await this._getTokenRegistryContractAsync();
-        const metadata = await tokenRegistryContract.getTokenMetaData.callAsync(address);
+        const metadata = await tokenRegistryContract.getTokenMetaData.callAsync(normalizedAddress);
         const token = TokenRegistryWrapper._createTokenFromMetadata(metadata);
         return token;
     }
@@ -115,14 +117,11 @@ export class TokenRegistryWrapper extends ContractWrapper {
         if (!_.isUndefined(this._tokenRegistryContractIfExists)) {
             return this._tokenRegistryContractIfExists;
         }
-        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
+        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
             artifacts.TokenRegistryArtifact,
             this._contractAddressIfExists,
         );
-        const contractInstance = new TokenRegistryContract(
-            web3ContractInstance,
-            this._web3Wrapper.getContractDefaults(),
-        );
+        const contractInstance = new TokenRegistryContract(this._web3Wrapper, abi, address);
         this._tokenRegistryContractIfExists = contractInstance;
         return this._tokenRegistryContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
index f5d9d108a..211c7dfb4 100644
--- a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
@@ -2,6 +2,7 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
+import { assert } from '../utils/assert';
 
 import { ContractWrapper } from './contract_wrapper';
 import { TokenTransferProxyContract } from './generated/token_transfer_proxy';
@@ -22,8 +23,12 @@ export class TokenTransferProxyWrapper extends ContractWrapper {
      * @return  Whether the exchangeContractAddress is authorized.
      */
     public async isAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
+        assert.isETHAddressHex('exchangeContractAddress', exchangeContractAddress);
+        const normalizedExchangeContractAddress = exchangeContractAddress.toLowerCase();
         const tokenTransferProxyContractInstance = await this._getTokenTransferProxyContractAsync();
-        const isAuthorized = await tokenTransferProxyContractInstance.authorized.callAsync(exchangeContractAddress);
+        const isAuthorized = await tokenTransferProxyContractInstance.authorized.callAsync(
+            normalizedExchangeContractAddress,
+        );
         return isAuthorized;
     }
     /**
@@ -54,14 +59,11 @@ export class TokenTransferProxyWrapper extends ContractWrapper {
         if (!_.isUndefined(this._tokenTransferProxyContractIfExists)) {
             return this._tokenTransferProxyContractIfExists;
         }
-        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
+        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
             artifacts.TokenTransferProxyArtifact,
             this._contractAddressIfExists,
         );
-        const contractInstance = new TokenTransferProxyContract(
-            web3ContractInstance,
-            this._web3Wrapper.getContractDefaults(),
-        );
+        const contractInstance = new TokenTransferProxyContract(this._web3Wrapper, abi, address);
         this._tokenTransferProxyContractIfExists = contractInstance;
         return this._tokenTransferProxyContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index a018006b8..0f688cb71 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -46,10 +46,13 @@ export class TokenWrapper extends ContractWrapper {
     ): Promise<BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
 
-        const tokenContract = await this._getTokenContractAsync(tokenAddress);
+        const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
-        let balance = await tokenContract.balanceOf.callAsync(ownerAddress, defaultBlock);
+        const txData = {};
+        let balance = await tokenContract.balanceOf.callAsync(normalizedOwnerAddress, txData, defaultBlock);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         balance = new BigNumber(balance);
         return balance;
@@ -72,14 +75,17 @@ export class TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
-        await assert.isSenderAddressAsync('ownerAddress', ownerAddress, this._web3Wrapper);
         assert.isETHAddressHex('spenderAddress', spenderAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        await assert.isSenderAddressAsync('ownerAddress', ownerAddress, this._web3Wrapper);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedSpenderAddress = spenderAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
-        const tokenContract = await this._getTokenContractAsync(tokenAddress);
-        const txHash = await tokenContract.approve.sendTransactionAsync(spenderAddress, amountInBaseUnits, {
-            from: ownerAddress,
+        const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
+        const txHash = await tokenContract.approve.sendTransactionAsync(normalizedSpenderAddress, amountInBaseUnits, {
+            from: normalizedOwnerAddress,
             gas: txOpts.gasLimit,
             gasPrice: txOpts.gasPrice,
         });
@@ -103,10 +109,16 @@ export class TokenWrapper extends ContractWrapper {
         spenderAddress: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.isETHAddressHex('spenderAddress', spenderAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
+        const normalizedSpenderAddress = spenderAddress.toLowerCase();
         const txHash = await this.setAllowanceAsync(
-            tokenAddress,
-            ownerAddress,
-            spenderAddress,
+            normalizedTokenAddress,
+            normalizedOwnerAddress,
+            normalizedSpenderAddress,
             this.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
             txOpts,
         );
@@ -128,10 +140,20 @@ export class TokenWrapper extends ContractWrapper {
     ): Promise<BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.isETHAddressHex('spenderAddress', spenderAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
+        const normalizedSpenderAddress = spenderAddress.toLowerCase();
 
-        const tokenContract = await this._getTokenContractAsync(tokenAddress);
+        const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
-        let allowanceInBaseUnits = await tokenContract.allowance.callAsync(ownerAddress, spenderAddress, defaultBlock);
+        const txData = {};
+        let allowanceInBaseUnits = await tokenContract.allowance.callAsync(
+            normalizedOwnerAddress,
+            normalizedSpenderAddress,
+            txData,
+            defaultBlock,
+        );
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         allowanceInBaseUnits = new BigNumber(allowanceInBaseUnits);
         return allowanceInBaseUnits;
@@ -149,9 +171,16 @@ export class TokenWrapper extends ContractWrapper {
     ): Promise<BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
 
         const proxyAddress = this._tokenTransferProxyWrapper.getContractAddress();
-        const allowanceInBaseUnits = await this.getAllowanceAsync(tokenAddress, ownerAddress, proxyAddress, methodOpts);
+        const allowanceInBaseUnits = await this.getAllowanceAsync(
+            normalizedTokenAddress,
+            normalizedOwnerAddress,
+            proxyAddress,
+            methodOpts,
+        );
         return allowanceInBaseUnits;
     }
     /**
@@ -172,12 +201,14 @@ export class TokenWrapper extends ContractWrapper {
     ): Promise<string> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
         const proxyAddress = this._tokenTransferProxyWrapper.getContractAddress();
         const txHash = await this.setAllowanceAsync(
-            tokenAddress,
-            ownerAddress,
+            normalizedTokenAddress,
+            normalizedOwnerAddress,
             proxyAddress,
             amountInBaseUnits,
             txOpts,
@@ -200,9 +231,13 @@ export class TokenWrapper extends ContractWrapper {
         ownerAddress: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
         const txHash = await this.setProxyAllowanceAsync(
-            tokenAddress,
-            ownerAddress,
+            normalizedTokenAddress,
+            normalizedOwnerAddress,
             this.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
             txOpts,
         );
@@ -225,19 +260,22 @@ export class TokenWrapper extends ContractWrapper {
         txOpts: TransactionOpts = {},
     ): Promise<string> {
         assert.isETHAddressHex('tokenAddress', tokenAddress);
-        await assert.isSenderAddressAsync('fromAddress', fromAddress, this._web3Wrapper);
         assert.isETHAddressHex('toAddress', toAddress);
+        await assert.isSenderAddressAsync('fromAddress', fromAddress, this._web3Wrapper);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedFromAddress = fromAddress.toLowerCase();
+        const normalizedToAddress = toAddress.toLowerCase();
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
-        const tokenContract = await this._getTokenContractAsync(tokenAddress);
+        const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
 
-        const fromAddressBalance = await this.getBalanceAsync(tokenAddress, fromAddress);
+        const fromAddressBalance = await this.getBalanceAsync(normalizedTokenAddress, normalizedFromAddress);
         if (fromAddressBalance.lessThan(amountInBaseUnits)) {
             throw new Error(ZeroExError.InsufficientBalanceForTransfer);
         }
 
-        const txHash = await tokenContract.transfer.sendTransactionAsync(toAddress, amountInBaseUnits, {
-            from: fromAddress,
+        const txHash = await tokenContract.transfer.sendTransactionAsync(normalizedToAddress, amountInBaseUnits, {
+            from: normalizedFromAddress,
             gas: txOpts.gasLimit,
             gasPrice: txOpts.gasPrice,
         });
@@ -265,30 +303,38 @@ export class TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
-        assert.isETHAddressHex('tokenAddress', tokenAddress);
-        assert.isETHAddressHex('fromAddress', fromAddress);
         assert.isETHAddressHex('toAddress', toAddress);
+        assert.isETHAddressHex('fromAddress', fromAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         await assert.isSenderAddressAsync('senderAddress', senderAddress, this._web3Wrapper);
+        const normalizedToAddress = toAddress.toLowerCase();
+        const normalizedFromAddress = fromAddress.toLowerCase();
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        const normalizedSenderAddress = senderAddress.toLowerCase();
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
-        const tokenContract = await this._getTokenContractAsync(tokenAddress);
+        const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
 
-        const fromAddressAllowance = await this.getAllowanceAsync(tokenAddress, fromAddress, senderAddress);
+        const fromAddressAllowance = await this.getAllowanceAsync(
+            normalizedTokenAddress,
+            normalizedFromAddress,
+            normalizedSenderAddress,
+        );
         if (fromAddressAllowance.lessThan(amountInBaseUnits)) {
             throw new Error(ZeroExError.InsufficientAllowanceForTransfer);
         }
 
-        const fromAddressBalance = await this.getBalanceAsync(tokenAddress, fromAddress);
+        const fromAddressBalance = await this.getBalanceAsync(normalizedTokenAddress, normalizedFromAddress);
         if (fromAddressBalance.lessThan(amountInBaseUnits)) {
             throw new Error(ZeroExError.InsufficientBalanceForTransfer);
         }
 
         const txHash = await tokenContract.transferFrom.sendTransactionAsync(
-            fromAddress,
-            toAddress,
+            normalizedFromAddress,
+            normalizedToAddress,
             amountInBaseUnits,
             {
-                from: senderAddress,
+                from: normalizedSenderAddress,
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
             },
@@ -311,11 +357,12 @@ export class TokenWrapper extends ContractWrapper {
         callback: EventCallback<ArgsType>,
     ): string {
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
         assert.doesBelongToStringEnum('eventName', eventName, TokenEvents);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         assert.isFunction('callback', callback);
         const subscriptionToken = this._subscribe<ArgsType>(
-            tokenAddress,
+            normalizedTokenAddress,
             eventName,
             indexFilterValues,
             artifacts.TokenArtifact.abi,
@@ -333,7 +380,7 @@ export class TokenWrapper extends ContractWrapper {
     /**
      * Cancels all existing subscriptions
      */
-    public _unsubscribeAll(): void {
+    public unsubscribeAll(): void {
         super._unsubscribeAll();
     }
     /**
@@ -352,11 +399,12 @@ export class TokenWrapper extends ContractWrapper {
         indexFilterValues: IndexedFilterValues,
     ): Promise<Array<LogWithDecodedArgs<ArgsType>>> {
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
         assert.doesBelongToStringEnum('eventName', eventName, TokenEvents);
         assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         const logs = await this._getLogsAsync<ArgsType>(
-            tokenAddress,
+            normalizedTokenAddress,
             eventName,
             blockRange,
             indexFilterValues,
@@ -365,21 +413,22 @@ export class TokenWrapper extends ContractWrapper {
         return logs;
     }
     private _invalidateContractInstances(): void {
-        this._unsubscribeAll();
+        this.unsubscribeAll();
         this._tokenContractsByAddress = {};
     }
     private async _getTokenContractAsync(tokenAddress: string): Promise<TokenContract> {
-        let tokenContract = this._tokenContractsByAddress[tokenAddress];
+        const normalizedTokenAddress = tokenAddress.toLowerCase();
+        let tokenContract = this._tokenContractsByAddress[normalizedTokenAddress];
         if (!_.isUndefined(tokenContract)) {
             return tokenContract;
         }
-        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
+        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
             artifacts.TokenArtifact,
-            tokenAddress,
+            normalizedTokenAddress,
         );
-        const contractInstance = new TokenContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
+        const contractInstance = new TokenContract(this._web3Wrapper, abi, address);
         tokenContract = contractInstance;
-        this._tokenContractsByAddress[tokenAddress] = tokenContract;
+        this._tokenContractsByAddress[normalizedTokenAddress] = tokenContract;
         return tokenContract;
     }
 }
diff --git a/packages/0x.js/src/schemas/zero_ex_config_schema.ts b/packages/0x.js/src/schemas/zero_ex_config_schema.ts
index 546b1c2d0..a9c3c64fc 100644
--- a/packages/0x.js/src/schemas/zero_ex_config_schema.ts
+++ b/packages/0x.js/src/schemas/zero_ex_config_schema.ts
@@ -1,27 +1,5 @@
 export const zeroExConfigSchema = {
     id: '/ZeroExConfig',
-    properties: {
-        networkId: {
-            type: 'number',
-            minimum: 0,
-        },
-        gasPrice: { $ref: '/Number' },
-        exchangeContractAddress: { $ref: '/Address' },
-        tokenRegistryContractAddress: { $ref: '/Address' },
-        orderWatcherConfig: {
-            type: 'object',
-            properties: {
-                pollingIntervalMs: {
-                    type: 'number',
-                    minimum: 0,
-                },
-                numConfirmations: {
-                    type: 'number',
-                    minimum: 0,
-                },
-            },
-        },
-    },
+    oneOf: [{ $ref: '/ZeroExPrivateNetworkConfig' }, { $ref: '/ZeroExPublicNetworkConfig' }],
     type: 'object',
-    required: ['networkId'],
 };
diff --git a/packages/0x.js/src/schemas/zero_ex_private_network_config_schema.ts b/packages/0x.js/src/schemas/zero_ex_private_network_config_schema.ts
new file mode 100644
index 000000000..f7f649a6d
--- /dev/null
+++ b/packages/0x.js/src/schemas/zero_ex_private_network_config_schema.ts
@@ -0,0 +1,35 @@
+export const zeroExPrivateNetworkConfigSchema = {
+    id: '/ZeroExPrivateNetworkConfig',
+    properties: {
+        networkId: {
+            type: 'number',
+            minimum: 1,
+        },
+        gasPrice: { $ref: '/Number' },
+        zrxContractAddress: { $ref: '/Address' },
+        exchangeContractAddress: { $ref: '/Address' },
+        tokenRegistryContractAddress: { $ref: '/Address' },
+        tokenTransferProxyContractAddress: { $ref: '/Address' },
+        orderWatcherConfig: {
+            type: 'object',
+            properties: {
+                pollingIntervalMs: {
+                    type: 'number',
+                    minimum: 0,
+                },
+                numConfirmations: {
+                    type: 'number',
+                    minimum: 0,
+                },
+            },
+        },
+    },
+    type: 'object',
+    required: [
+        'networkId',
+        'zrxContractAddress',
+        'exchangeContractAddress',
+        'tokenRegistryContractAddress',
+        'tokenTransferProxyContractAddress',
+    ],
+};
diff --git a/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts b/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts
new file mode 100644
index 000000000..9da31481a
--- /dev/null
+++ b/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts
@@ -0,0 +1,29 @@
+export const zeroExPublicNetworkConfigSchema = {
+    id: '/ZeroExPublicNetworkConfig',
+    properties: {
+        networkId: {
+            type: 'number',
+            enum: [1, 3, 4, 42, 50],
+        },
+        gasPrice: { $ref: '/Number' },
+        zrxContractAddress: { $ref: '/Address' },
+        exchangeContractAddress: { $ref: '/Address' },
+        tokenRegistryContractAddress: { $ref: '/Address' },
+        tokenTransferProxyContractAddress: { $ref: '/Address' },
+        orderWatcherConfig: {
+            type: 'object',
+            properties: {
+                pollingIntervalMs: {
+                    type: 'number',
+                    minimum: 0,
+                },
+                numConfirmations: {
+                    type: 'number',
+                    minimum: 0,
+                },
+            },
+        },
+    },
+    type: 'object',
+    required: ['networkId'],
+};
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index ab97f7775..2f17e30c2 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -127,7 +127,7 @@ export interface SignedOrder extends Order {
 }
 
 //                          [address, name, symbol, decimals, ipfsHash, swarmHash]
-export type TokenMetadata = [string, string, string, BigNumber, string, string];
+export type TokenMetadata = [string, string, string, number, string, string];
 
 export interface Token {
     name: string;
@@ -196,7 +196,7 @@ export interface OrderStateWatcherConfig {
 }
 
 /*
- * networkId: The id of the underlying ethereum network your provider is connected to. (1-mainnet, 42-kovan, 50-testrpc)
+ * networkId: The id of the underlying ethereum network your provider is connected to. (1-mainnet, 3-ropsten, 4-rinkeby, 42-kovan, 50-testrpc)
  * gasPrice: Gas price to use with every transaction
  * exchangeContractAddress: The address of an exchange contract to use
  * zrxContractAddress: The address of the ZRX contract to use
diff --git a/packages/0x.js/test/ether_token_wrapper_test.ts b/packages/0x.js/test/ether_token_wrapper_test.ts
index da49ec467..68f2c6f66 100644
--- a/packages/0x.js/test/ether_token_wrapper_test.ts
+++ b/packages/0x.js/test/ether_token_wrapper_test.ts
@@ -75,11 +75,14 @@ describe('EtherTokenWrapper', () => {
             const contractAddressIfExists = zeroEx.etherToken.getContractAddressIfExists();
             expect(contractAddressIfExists).to.not.be.undefined();
         });
-        it('should return undefined if connected to an unknown network', () => {
+        it('should throw if connected to a private network and contract addresses are not specified', () => {
             const UNKNOWN_NETWORK_NETWORK_ID = 10;
-            const unknownNetworkZeroEx = new ZeroEx(web3.currentProvider, { networkId: UNKNOWN_NETWORK_NETWORK_ID });
-            const contractAddressIfExists = unknownNetworkZeroEx.etherToken.getContractAddressIfExists();
-            expect(contractAddressIfExists).to.be.undefined();
+            expect(
+                () =>
+                    new ZeroEx(web3.currentProvider, {
+                        networkId: UNKNOWN_NETWORK_NETWORK_ID,
+                    } as any),
+            ).to.throw();
         });
     });
     describe('#depositAsync', () => {
@@ -155,7 +158,7 @@ describe('EtherTokenWrapper', () => {
             etherTokenAddress = etherToken.address;
         });
         afterEach(() => {
-            zeroEx.etherToken._unsubscribeAll();
+            zeroEx.etherToken.unsubscribeAll();
         });
         // Hack: Mocha does not allow a test to be both async and have a `done` callback
         // Since we need to await the receipt of the event in the `subscribe` callback,
diff --git a/packages/0x.js/test/exchange_wrapper_test.ts b/packages/0x.js/test/exchange_wrapper_test.ts
index 325426438..688be628f 100644
--- a/packages/0x.js/test/exchange_wrapper_test.ts
+++ b/packages/0x.js/test/exchange_wrapper_test.ts
@@ -922,7 +922,7 @@ describe('ExchangeWrapper', () => {
             );
         });
         afterEach(async () => {
-            zeroEx.exchange._unsubscribeAll();
+            zeroEx.exchange.unsubscribeAll();
         });
         // Hack: Mocha does not allow a test to be both async and have a `done` callback
         // Since we need to await the receipt of the event in the `subscribe` callback,
diff --git a/packages/0x.js/test/expiration_watcher_test.ts b/packages/0x.js/test/expiration_watcher_test.ts
index b49dee8e5..7f79e3802 100644
--- a/packages/0x.js/test/expiration_watcher_test.ts
+++ b/packages/0x.js/test/expiration_watcher_test.ts
@@ -9,10 +9,10 @@ import * as Web3 from 'web3';
 import { ZeroEx } from '../src/0x';
 import { ExpirationWatcher } from '../src/order_watcher/expiration_watcher';
 import { DoneCallback, Token } from '../src/types';
-import { constants } from '../src/utils/constants';
 import { utils } from '../src/utils/utils';
 
 import { chaiSetup } from './utils/chai_setup';
+import { constants } from './utils/constants';
 import { FillScenarios } from './utils/fill_scenarios';
 import { reportNoErrorCallbackErrors } from './utils/report_callback_errors';
 import { TokenUtils } from './utils/token_utils';
diff --git a/packages/0x.js/test/subscription_test.ts b/packages/0x.js/test/subscription_test.ts
index 337e2effa..f485bf84b 100644
--- a/packages/0x.js/test/subscription_test.ts
+++ b/packages/0x.js/test/subscription_test.ts
@@ -49,7 +49,7 @@ describe('SubscriptionTest', () => {
             tokenAddress = token.address;
         });
         afterEach(() => {
-            zeroEx.token._unsubscribeAll();
+            zeroEx.token.unsubscribeAll();
             _.each(stubs, s => s.restore());
             stubs = [];
         });
@@ -76,7 +76,7 @@ describe('SubscriptionTest', () => {
                 const callback = (err: Error | null, logEvent?: DecodedLogEvent<ApprovalContractEventArgs>) => _.noop;
                 zeroEx.token.subscribe(tokenAddress, TokenEvents.Approval, indexFilterValues, callback);
                 stubs = [Sinon.stub((zeroEx as any)._web3Wrapper, 'getBlockAsync').throws(new Error('JSON RPC error'))];
-                zeroEx.token._unsubscribeAll();
+                zeroEx.token.unsubscribeAll();
                 done();
             })().catch(done);
         });
diff --git a/packages/0x.js/test/token_wrapper_test.ts b/packages/0x.js/test/token_wrapper_test.ts
index 34ebe30c2..070d6ec47 100644
--- a/packages/0x.js/test/token_wrapper_test.ts
+++ b/packages/0x.js/test/token_wrapper_test.ts
@@ -377,7 +377,7 @@ describe('TokenWrapper', () => {
             tokenAddress = token.address;
         });
         afterEach(() => {
-            zeroEx.token._unsubscribeAll();
+            zeroEx.token.unsubscribeAll();
         });
         // Hack: Mocha does not allow a test to be both async and have a `done` callback
         // Since we need to await the receipt of the event in the `subscribe` callback,
diff --git a/packages/0x.js/test/utils/fill_scenarios.ts b/packages/0x.js/test/utils/fill_scenarios.ts
index 1a61487f4..8b1308298 100644
--- a/packages/0x.js/test/utils/fill_scenarios.ts
+++ b/packages/0x.js/test/utils/fill_scenarios.ts
@@ -35,12 +35,8 @@ export class FillScenarios {
         const web3Wrapper = (this._zeroEx as any)._web3Wrapper as Web3Wrapper;
         for (const token of this._tokens) {
             if (token.symbol !== 'ZRX' && token.symbol !== 'WETH') {
-                const contractInstance = web3Wrapper.getContractInstance(
-                    artifacts.DummyTokenArtifact.abi,
-                    token.address,
-                );
                 const defaults = {};
-                const dummyToken = new DummyTokenContract(contractInstance, defaults);
+                const dummyToken = new DummyTokenContract(web3Wrapper, artifacts.DummyTokenArtifact.abi, token.address);
                 const tokenSupply = ZeroEx.toBaseUnitAmount(INITIAL_COINBASE_TOKEN_SUPPLY_IN_UNITS, token.decimals);
                 const txHash = await dummyToken.setBalance.sendTransactionAsync(this._coinbase, tokenSupply, {
                     from: this._coinbase,
diff --git a/packages/0x.js/tsconfig.json b/packages/0x.js/tsconfig.json
index 117f51e83..a6b5c71c2 100644
--- a/packages/0x.js/tsconfig.json
+++ b/packages/0x.js/tsconfig.json
@@ -9,6 +9,7 @@
         "./test/**/*",
         "../../node_modules/types-bn/index.d.ts",
         "../../node_modules/types-ethereumjs-util/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts",
         "../../node_modules/web3-typescript-typings/index.d.ts",
         "../../node_modules/chai-typescript-typings/index.d.ts",
         "../../node_modules/chai-as-promised-typescript-typings/index.d.ts"
diff --git a/packages/abi-gen/CHANGELOG.md b/packages/abi-gen/CHANGELOG.md
index c86d6fb55..d9198d3ed 100644
--- a/packages/abi-gen/CHANGELOG.md
+++ b/packages/abi-gen/CHANGELOG.md
@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## v0.2.3 - _TBD, 2018_
+
+    * Add a `backend` parameter that allows you to specify the Ethereum library you use in your templates (`web3` or `ethers`). Ethers auto-converts small ints to numbers whereas Web3 doesn't. Defaults to `web3` (#413)
+    * Add support for [tuple types](https://solidity.readthedocs.io/en/develop/abi-spec.html#handling-tuple-types) (#413)
+    * Add `hasReturnValue` to context data (#413)
+
 ## v0.2.1 - _February 9, 2018_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/abi-gen/src/index.ts b/packages/abi-gen/src/index.ts
index bc5a974a9..7c29f7d1d 100644
--- a/packages/abi-gen/src/index.ts
+++ b/packages/abi-gen/src/index.ts
@@ -11,13 +11,14 @@ import * as yargs from 'yargs';
 import toSnakeCase = require('to-snake-case');
 import * as Web3 from 'web3';
 
-import { ContextData, ParamKind } from './types';
+import { ContextData, ContractsBackend, ParamKind } from './types';
 import { utils } from './utils';
 
 const ABI_TYPE_CONSTRUCTOR = 'constructor';
 const ABI_TYPE_METHOD = 'function';
 const ABI_TYPE_EVENT = 'event';
 const DEFAULT_NETWORK_ID = 50;
+const DEFAULT_BACKEND = 'web3';
 
 const args = yargs
     .option('abis', {
@@ -43,6 +44,12 @@ const args = yargs
         demandOption: true,
         normalize: true,
     })
+    .option('backend', {
+        describe: `The backing Ethereum library your app uses. Either 'web3' or 'ethers'. Ethers auto-converts small ints to numbers whereas Web3 doesn't.`,
+        type: 'string',
+        choices: [ContractsBackend.Web3, ContractsBackend.Ethers],
+        default: DEFAULT_BACKEND,
+    })
     .option('network-id', {
         describe: 'ID of the network where contract ABIs are nested in artifacts',
         type: 'number',
@@ -73,8 +80,8 @@ function writeOutputFile(name: string, renderedTsCode: string): void {
     utils.log(`Created: ${chalk.bold(filePath)}`);
 }
 
-Handlebars.registerHelper('parameterType', utils.solTypeToTsType.bind(utils, ParamKind.Input));
-Handlebars.registerHelper('returnType', utils.solTypeToTsType.bind(utils, ParamKind.Output));
+Handlebars.registerHelper('parameterType', utils.solTypeToTsType.bind(utils, ParamKind.Input, args.backend));
+Handlebars.registerHelper('returnType', utils.solTypeToTsType.bind(utils, ParamKind.Output, args.backend));
 
 if (args.partials) {
     registerPartials(args.partials);
@@ -129,6 +136,7 @@ for (const abiFileName of abiFileNames) {
         const methodData = {
             ...methodAbi,
             singleReturnValue: methodAbi.outputs.length === 1,
+            hasReturnValue: methodAbi.outputs.length !== 0,
         };
         return methodData;
     });
diff --git a/packages/abi-gen/src/types.ts b/packages/abi-gen/src/types.ts
index e82ab824b..deddb1857 100644
--- a/packages/abi-gen/src/types.ts
+++ b/packages/abi-gen/src/types.ts
@@ -12,8 +12,14 @@ export enum AbiType {
     Fallback = 'fallback',
 }
 
+export enum ContractsBackend {
+    Web3 = 'web3',
+    Ethers = 'ethers',
+}
+
 export interface Method extends Web3.MethodAbi {
     singleReturnValue: boolean;
+    hasReturnValue: boolean;
 }
 
 export interface ContextData {
diff --git a/packages/abi-gen/src/utils.ts b/packages/abi-gen/src/utils.ts
index 14255643a..3e4ff619a 100644
--- a/packages/abi-gen/src/utils.ts
+++ b/packages/abi-gen/src/utils.ts
@@ -3,17 +3,23 @@ import * as _ from 'lodash';
 import * as path from 'path';
 import * as Web3 from 'web3';
 
-import { AbiType, ParamKind } from './types';
+import { AbiType, ContractsBackend, ParamKind } from './types';
 
 export const utils = {
-    solTypeToTsType(paramKind: ParamKind, solType: string): string {
+    solTypeToTsType(
+        paramKind: ParamKind,
+        backend: ContractsBackend,
+        solType: string,
+        components?: Web3.DataItem[],
+    ): string {
         const trailingArrayRegex = /\[\d*\]$/;
         if (solType.match(trailingArrayRegex)) {
             const arrayItemSolType = solType.replace(trailingArrayRegex, '');
-            const arrayItemTsType = utils.solTypeToTsType(paramKind, arrayItemSolType);
-            const arrayTsType = utils.isUnionType(arrayItemTsType)
-                ? `Array<${arrayItemTsType}>`
-                : `${arrayItemTsType}[]`;
+            const arrayItemTsType = utils.solTypeToTsType(paramKind, backend, arrayItemSolType, components);
+            const arrayTsType =
+                utils.isUnionType(arrayItemTsType) || utils.isObjectType(arrayItemTsType)
+                    ? `Array<${arrayItemTsType}>`
+                    : `${arrayItemTsType}[]`;
             return arrayTsType;
         } else {
             const solTypeRegexToTsType = [
@@ -24,25 +30,49 @@ export const utils = {
                 { regex: '^bytes\\d*$', tsType: 'string' },
             ];
             if (paramKind === ParamKind.Input) {
-                // web3 allows to pass those an non-bignumbers and that's nice
-                // but it always returns stuff as BigNumbers
+                // web3 and ethers allow to pass those as numbers instead of bignumbers
                 solTypeRegexToTsType.unshift({
                     regex: '^u?int(8|16|32)?$',
                     tsType: 'number|BigNumber',
                 });
             }
+            if (backend === ContractsBackend.Ethers && paramKind === ParamKind.Output) {
+                // ethers-contracts automatically converts small BigNumbers to numbers
+                solTypeRegexToTsType.unshift({
+                    regex: '^u?int(8|16|32|48)?$',
+                    tsType: 'number',
+                });
+            }
             for (const regexAndTxType of solTypeRegexToTsType) {
                 const { regex, tsType } = regexAndTxType;
                 if (solType.match(regex)) {
                     return tsType;
                 }
             }
+            const TUPLE_TYPE_REGEX = '^tuple$';
+            if (solType.match(TUPLE_TYPE_REGEX)) {
+                const componentsType = _.map(components, component => {
+                    const componentValueType = utils.solTypeToTsType(
+                        paramKind,
+                        backend,
+                        component.type,
+                        component.components,
+                    );
+                    const componentType = `${component.name}: ${componentValueType}`;
+                    return componentType;
+                });
+                const tsType = `{${componentsType}}`;
+                return tsType;
+            }
             throw new Error(`Unknown Solidity type found: ${solType}`);
         }
     },
     isUnionType(tsType: string): boolean {
         return tsType === 'number|BigNumber';
     },
+    isObjectType(tsType: string): boolean {
+        return /^{.*}$/.test(tsType);
+    },
     log(...args: any[]): void {
         console.log(...args); // tslint:disable-line:no-console
     },
diff --git a/packages/assert/CHANGELOG.md b/packages/assert/CHANGELOG.md
index 23c2c5e56..6721c4cb6 100644
--- a/packages/assert/CHANGELOG.md
+++ b/packages/assert/CHANGELOG.md
@@ -1,5 +1,10 @@
 # CHANGELOG
 
+## v0.1.0 - _TBD, 2018_
+
+    * Remove isETHAddressHex checksum address check and assume address will be lowercased  (#373)
+    * Add an optional parameter `subSchemas` to `doesConformToSchema` method (#385)
+
 ## v0.0.18 - _February 9, 2017_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/assert/src/index.ts b/packages/assert/src/index.ts
index 7ad574ec7..40d083cb6 100644
--- a/packages/assert/src/index.ts
+++ b/packages/assert/src/index.ts
@@ -33,11 +33,8 @@ export const assert = {
         );
     },
     isETHAddressHex(variableName: string, value: string): void {
+        this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value));
         this.assert(addressUtils.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));
-        this.assert(
-            addressUtils.isAddress(value) && value.toLowerCase() === value,
-            `Checksummed addresses are not supported. Convert ${variableName} to lower case before passing`,
-        );
     },
     doesBelongToStringEnum(
         variableName: string,
@@ -66,8 +63,11 @@ export const assert = {
         const isWeb3Provider = _.isFunction(value.send) || _.isFunction(value.sendAsync);
         this.assert(isWeb3Provider, this.typeAssertionMessage(variableName, 'Web3.Provider', value));
     },
-    doesConformToSchema(variableName: string, value: any, schema: Schema): void {
+    doesConformToSchema(variableName: string, value: any, schema: Schema, subSchemas?: Schema[]): void {
         const schemaValidator = new SchemaValidator();
+        if (!_.isUndefined(subSchemas)) {
+            _.map(subSchemas, schemaValidator.addSchema.bind(schemaValidator));
+        }
         const validationResult = schemaValidator.validate(value, schema);
         const hasValidationErrors = validationResult.errors.length > 0;
         const msg = `Expected ${variableName} to conform to schema ${schema.id}
diff --git a/packages/base-contract/.npmignore b/packages/base-contract/.npmignore
new file mode 100644
index 000000000..ad5ffcd56
--- /dev/null
+++ b/packages/base-contract/.npmignore
@@ -0,0 +1,5 @@
+.*
+yarn-error.log
+/scripts/
+/src/
+tsconfig.json
diff --git a/packages/base-contract/CHANGELOG.md b/packages/base-contract/CHANGELOG.md
new file mode 100644
index 000000000..74e983f1c
--- /dev/null
+++ b/packages/base-contract/CHANGELOG.md
@@ -0,0 +1,5 @@
+# CHANGELOG
+
+## v0.0.1 - _TBD, 2018_
+
+    * Initial release (#TBD)
diff --git a/packages/base-contract/README.md b/packages/base-contract/README.md
new file mode 100644
index 000000000..ff0d4d303
--- /dev/null
+++ b/packages/base-contract/README.md
@@ -0,0 +1,53 @@
+## @0xproject/base-contract
+
+BaseContract to derive all auto-generated wrappers from
+
+## Installation
+
+```bash
+yarn add @0xproject/base-contract
+```
+
+## Usage
+
+```javascript
+import { BaseContract } from '@0xproject/base-contract';
+```
+
+## Contributing
+
+We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+```bash
+yarn build
+```
+
+or
+
+```bash
+yarn build:watch
+```
+
+### Lint
+
+```bash
+yarn lint
+```
diff --git a/packages/base-contract/package.json b/packages/base-contract/package.json
new file mode 100644
index 000000000..6edbed161
--- /dev/null
+++ b/packages/base-contract/package.json
@@ -0,0 +1,39 @@
+{
+    "name": "@0xproject/base-contract",
+    "version": "0.0.1",
+    "description": "0x Base TS contract",
+    "main": "lib/index.js",
+    "types": "lib/index.d.ts",
+    "scripts": {
+        "build:watch": "tsc -w",
+        "build": "tsc",
+        "clean": "shx rm -rf lib",
+        "lint": "tslint --project . 'src/**/*.ts'"
+    },
+    "license": "Apache-2.0",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/0xProject/0x.js.git"
+    },
+    "bugs": {
+        "url": "https://github.com/0xProject/0x.js/issues"
+    },
+    "homepage": "https://github.com/0xProject/0x.js/packages/base-contract/README.md",
+    "devDependencies": {
+        "@0xproject/tslint-config": "^0.4.9",
+        "@types/lodash": "^4.14.86",
+        "npm-run-all": "^4.1.2",
+        "shx": "^0.2.2",
+        "tslint": "5.8.0",
+        "typescript": "2.7.1",
+        "ethers-typescript-typings": "^0.0.1",
+        "web3-typescript-typings": "^0.9.11"
+    },
+    "dependencies": {
+        "@0xproject/types": "^0.2.3",
+        "@0xproject/web3-wrapper": "^0.1.14",
+        "ethers-contracts": "^2.2.1",
+        "lodash": "^4.17.4",
+        "web3": "^0.20.0"
+    }
+}
diff --git a/packages/base-contract/src/index.ts b/packages/base-contract/src/index.ts
new file mode 100644
index 000000000..cc1e16a13
--- /dev/null
+++ b/packages/base-contract/src/index.ts
@@ -0,0 +1,68 @@
+import { TxData, TxDataPayable } from '@0xproject/types';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as ethersContracts from 'ethers-contracts';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+export class BaseContract {
+    protected _ethersInterface: ethersContracts.Interface;
+    protected _web3Wrapper: Web3Wrapper;
+    public abi: Web3.ContractAbi;
+    public address: string;
+    protected static _transformABIData(
+        abis: Web3.DataItem[],
+        values: any[],
+        transformation: (type: string, value: any) => any,
+    ): any {
+        return _.map(values, (value: any, i: number) =>
+            BaseContract._transformTypedData(abis[i].type, value, transformation),
+        );
+    }
+    protected static _lowercaseAddress(type: string, value: string): string {
+        return type === 'address' ? value.toLowerCase() : value;
+    }
+    protected static _bigNumberToString(type: string, value: string): string {
+        return _.isObject(value) && (value as any).isBigNumber ? value.toString() : value;
+    }
+    private static _transformTypedData(
+        type: string,
+        values: any,
+        transformation: (type: string, value: any) => any,
+    ): any {
+        const trailingArrayRegex = /\[\d*\]$/;
+        if (type.match(trailingArrayRegex)) {
+            const arrayItemType = type.replace(trailingArrayRegex, '');
+            return _.map(values, value => this._transformTypedData(arrayItemType, value, transformation));
+        } else {
+            return transformation(type, values);
+        }
+    }
+    protected async _applyDefaultsToTxDataAsync<T extends Partial<TxData | TxDataPayable>>(
+        txData: T,
+        estimateGasAsync?: (txData: T) => Promise<number>,
+    ): Promise<TxData> {
+        // Gas amount sourced with the following priorities:
+        // 1. Optional param passed in to public method call
+        // 2. Global config passed in at library instantiation
+        // 3. Gas estimate calculation + safety margin
+        const removeUndefinedProperties = _.pickBy;
+        const txDataWithDefaults = {
+            to: this.address,
+            ...removeUndefinedProperties(this._web3Wrapper.getContractDefaults()),
+            ...removeUndefinedProperties(txData as any),
+            // HACK: TS can't prove that T is spreadable.
+            // Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
+        };
+        if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
+            const estimatedGas = await estimateGasAsync(txData);
+            txDataWithDefaults.gas = estimatedGas;
+        }
+        return txDataWithDefaults;
+    }
+    constructor(web3Wrapper: Web3Wrapper, abi: Web3.ContractAbi, address: string) {
+        this._web3Wrapper = web3Wrapper;
+        this.abi = abi;
+        this.address = address;
+        this._ethersInterface = new ethersContracts.Interface(abi);
+    }
+}
diff --git a/packages/base-contract/tsconfig.json b/packages/base-contract/tsconfig.json
new file mode 100644
index 000000000..8114d99cd
--- /dev/null
+++ b/packages/base-contract/tsconfig.json
@@ -0,0 +1,11 @@
+{
+    "extends": "../../tsconfig",
+    "compilerOptions": {
+        "outDir": "lib"
+    },
+    "include": [
+        "./src/**/*",
+        "../../node_modules/web3-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts"
+    ]
+}
diff --git a/packages/base-contract/tslint.json b/packages/base-contract/tslint.json
new file mode 100644
index 000000000..ffaefe83a
--- /dev/null
+++ b/packages/base-contract/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": ["@0xproject/tslint-config"]
+}
diff --git a/packages/connect/README.md b/packages/connect/README.md
index 63faf5271..7302322e6 100644
--- a/packages/connect/README.md
+++ b/packages/connect/README.md
@@ -10,8 +10,8 @@ yarn add @0xproject/connect
 
 ## Usage
 
-* [Docs](https://0xproject.com/docs/connect)
-* [Tutorials](https://0xproject.com/wiki#connect)
+*   [Docs](https://0xproject.com/docs/connect)
+*   [Tutorials](https://0xproject.com/wiki#connect)
 
 ## Contributing
 
diff --git a/packages/0x.js/contract_templates/contract.handlebars b/packages/contract_templates/contract.handlebars
index 33699b8a7..2e8ac3f06 100644
--- a/packages/0x.js/contract_templates/contract.handlebars
+++ b/packages/contract_templates/contract.handlebars
@@ -1,15 +1,17 @@
 /**
  * This file is auto-generated using abi-gen. Don't edit directly.
- * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/0x.js/contract_templates.
+ * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/contract_templates.
  */
 // tslint:disable:no-consecutive-blank-lines
 // tslint:disable-next-line:no-unused-variable
+import { BaseContract } from '@0xproject/base-contract';
 import { TxData, TxDataPayable } from '@0xproject/types';
 import { BigNumber, classUtils, promisify } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as ethersContracts from 'ethers-contracts';
+import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
-import {BaseContract} from './base_contract';
-
 {{#if events}}
 export type {{contractName}}ContractEventArgs =
 {{#each events}}
@@ -28,6 +30,7 @@ export enum {{contractName}}Events {
 {{/each}}
 {{/if}}
 
+// tslint:disable:no-parameter-reassignment
 export class {{contractName}}Contract extends BaseContract {
 {{#each methods}}
     {{#this.constant}}
@@ -37,8 +40,8 @@ export class {{contractName}}Contract extends BaseContract {
     {{> tx contractName=../contractName}}
     {{/this.constant}}
 {{/each}}
-    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
-        super(web3ContractInstance, defaults);
-        classUtils.bindAll(this, ['_web3ContractInstance', '_defaults']);
+    constructor(web3Wrapper: Web3Wrapper, abi: Web3.ContractAbi, address: string) {
+        super(web3Wrapper, abi, address);
+        classUtils.bindAll(this, ['_ethersInterface', 'address', 'abi', '_web3Wrapper']);
     }
 } // tslint:disable:max-file-line-count
diff --git a/packages/contract_templates/partials/call.handlebars b/packages/contract_templates/partials/call.handlebars
new file mode 100644
index 000000000..cfb9bea82
--- /dev/null
+++ b/packages/contract_templates/partials/call.handlebars
@@ -0,0 +1,3 @@
+public {{this.name}} = {
+    {{> callAsync}}
+};
diff --git a/packages/contract_templates/partials/callAsync.handlebars b/packages/contract_templates/partials/callAsync.handlebars
new file mode 100644
index 000000000..93d347145
--- /dev/null
+++ b/packages/contract_templates/partials/callAsync.handlebars
@@ -0,0 +1,30 @@
+{{#hasReturnValue}}
+async callAsync(
+{{> typed_params inputs=inputs}}
+{{#this.payable}}
+    txData: TxDataPayable = {},
+{{/this.payable}}
+{{^this.payable}}
+    txData: TxData = {},
+{{/this.payable}}
+    defaultBlock?: Web3.BlockParam,
+): Promise<{{> return_type outputs=outputs}}> {
+    const self = this as {{contractName}}Contract;
+    const inputAbi = _.find(this.abi, {name: '{{this.name}}'}).inputs;
+    [{{> params inputs=inputs}}] = BaseContract._transformABIData(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(this));
+    const encodedData = self._ethersInterface.functions.{{this.name}}(
+        {{> params inputs=inputs}}
+    ).data;
+    const callData = await self._applyDefaultsToTxDataAsync(
+        {
+            data: encodedData,
+        }
+    )
+    const rawCallResult = await self._web3Wrapper.callAsync(callData, defaultBlock);
+    const outputAbi = _.find(this.abi, {name: '{{this.name}}'}).outputs as Web3.DataItem[];
+    const outputParamsTypes = _.map(outputAbi, 'type');
+    let resultArray = ethersContracts.Interface.decodeParams(outputParamsTypes, rawCallResult) as any;
+    resultArray = BaseContract._transformABIData(outputAbi, resultArray, BaseContract._lowercaseAddress.bind(this));
+    return resultArray{{#singleReturnValue}}[0]{{/singleReturnValue}};
+},
+{{/hasReturnValue}}
diff --git a/packages/0x.js/contract_templates/partials/event.handlebars b/packages/contract_templates/partials/event.handlebars
index 6d68d4c0f..3c6100e4f 100644
--- a/packages/0x.js/contract_templates/partials/event.handlebars
+++ b/packages/contract_templates/partials/event.handlebars
@@ -1,5 +1,5 @@
 export interface {{name}}ContractEventArgs {
     {{#each inputs}}
-    {{name}}: {{#returnType type}}{{/returnType}};
+    {{name}}: {{#returnType type components}}{{/returnType}};
     {{/each}}
 }
diff --git a/packages/0x.js/contract_templates/partials/params.handlebars b/packages/contract_templates/partials/params.handlebars
index ac5d4ae85..ac5d4ae85 100644
--- a/packages/0x.js/contract_templates/partials/params.handlebars
+++ b/packages/contract_templates/partials/params.handlebars
diff --git a/packages/contract_templates/partials/return_type.handlebars b/packages/contract_templates/partials/return_type.handlebars
new file mode 100644
index 000000000..9dd509953
--- /dev/null
+++ b/packages/contract_templates/partials/return_type.handlebars
@@ -0,0 +1,10 @@
+{{#if outputs.length}}
+{{#singleReturnValue}}
+{{#returnType outputs.0.type components}}{{/returnType}}
+{{/singleReturnValue}}
+{{^singleReturnValue}}
+[{{#each outputs}}{{#returnType type components}}{{/returnType}}{{#unless @last}}, {{/unless}}{{/each}}]
+{{/singleReturnValue}}
+{{else}}
+void
+{{/if}}
diff --git a/packages/0x.js/contract_templates/partials/tx.handlebars b/packages/contract_templates/partials/tx.handlebars
index 9df83266a..347a482d6 100644
--- a/packages/0x.js/contract_templates/partials/tx.handlebars
+++ b/packages/contract_templates/partials/tx.handlebars
@@ -9,19 +9,22 @@ public {{this.name}} = {
     {{/this.payable}}
     ): Promise<string> {
         const self = this as {{contractName}}Contract;
+        const inputAbi = _.find(this.abi, {name: '{{this.name}}'}).inputs;
+        [{{> params inputs=inputs}}] = BaseContract._transformABIData(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(this));
+        const encodedData = this._ethersInterface.functions.{{this.name}}(
+            {{> params inputs=inputs}}
+        ).data
         const txDataWithDefaults = await self._applyDefaultsToTxDataAsync(
-            txData,
+            {
+                ...txData,
+                data: encodedData,
+            },
             self.{{this.name}}.estimateGasAsync.bind(
                 self,
                 {{> params inputs=inputs}}
             ),
         );
-        const txHash = await promisify<string>(
-            self._web3ContractInstance.{{this.name}}, self._web3ContractInstance,
-        )(
-            {{> params inputs=inputs}}
-            txDataWithDefaults,
-        );
+        const txHash = await this._web3Wrapper.sendTransactionAsync(txDataWithDefaults);
         return txHash;
     },
     async estimateGasAsync(
@@ -29,15 +32,16 @@ public {{this.name}} = {
         txData: TxData = {},
     ): Promise<number> {
         const self = this as {{contractName}}Contract;
-        const txDataWithDefaults = await self._applyDefaultsToTxDataAsync(
-            txData,
-        );
-        const gas = await promisify<number>(
-            self._web3ContractInstance.{{this.name}}.estimateGas, self._web3ContractInstance,
-        )(
+        const encodedData = this._ethersInterface.functions.{{this.name}}(
             {{> params inputs=inputs}}
-            txDataWithDefaults,
+        ).data
+        const txDataWithDefaults = await self._applyDefaultsToTxDataAsync(
+            {
+                ...txData,
+                data: encodedData,
+            }
         );
+        const gas = await this._web3Wrapper.estimateGasAsync(txDataWithDefaults);
         return gas;
     },
     getABIEncodedTransactionData(
@@ -45,7 +49,10 @@ public {{this.name}} = {
         txData: TxData = {},
     ): string {
         const self = this as {{contractName}}Contract;
-        const abiEncodedTransactionData = self._web3ContractInstance.{{this.name}}.getData();
+        const abiEncodedTransactionData = this._ethersInterface.functions.{{this.name}}(
+            {{> params inputs=inputs}}
+        ).data
         return abiEncodedTransactionData;
     },
+    {{> callAsync}}
 };
diff --git a/packages/contract_templates/partials/typed_params.handlebars b/packages/contract_templates/partials/typed_params.handlebars
new file mode 100644
index 000000000..c100e58f7
--- /dev/null
+++ b/packages/contract_templates/partials/typed_params.handlebars
@@ -0,0 +1,3 @@
+{{#each inputs}}
+    {{name}}: {{#parameterType type components}}{{/parameterType}},
+{{/each}}
diff --git a/packages/contracts/README.md b/packages/contracts/README.md
index 11b9e5056..c209edf02 100644
--- a/packages/contracts/README.md
+++ b/packages/contracts/README.md
@@ -4,11 +4,11 @@ Smart contracts that implement the 0x protocol.
 
 ## Usage
 
-* [Docs](https://0xproject.com/docs/contracts)
-* [Overview of 0x protocol architecture](https://0xproject.com/wiki#Architecture)
-* [0x smart contract interactions](https://0xproject.com/wiki#Contract-Interactions)
-* [Deployed smart contract addresses](https://0xproject.com/wiki#Deployed-Addresses)
-* [0x protocol message format](https://0xproject.com/wiki#Message-Format)
+*   [Docs](https://0xproject.com/docs/contracts)
+*   [Overview of 0x protocol architecture](https://0xproject.com/wiki#Architecture)
+*   [0x smart contract interactions](https://0xproject.com/wiki#Contract-Interactions)
+*   [Deployed smart contract addresses](https://0xproject.com/wiki#Deployed-Addresses)
+*   [0x protocol message format](https://0xproject.com/wiki#Message-Format)
 
 ## Contributing
 
diff --git a/packages/contracts/contract_templates/contract.handlebars b/packages/contracts/contract_templates/contract.handlebars
deleted file mode 100644
index afb9708e9..000000000
--- a/packages/contracts/contract_templates/contract.handlebars
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * This file is auto-generated using abi-gen. Don't edit directly.
- * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
- */
-// tslint:disable:async-suffix member-ordering no-consecutive-blank-lines
-// tslint:disable-next-line:no-unused-variable
-import { TxData, TxDataPayable } from '@0xproject/types';
-import { BigNumber, classUtils, promisify } from '@0xproject/utils';
-import * as Web3 from 'web3';
-
-import {BaseContract} from './base_contract';
-
-export class {{contractName}}Contract extends BaseContract {
-{{#each methods}}
-    {{#this.constant}}
-    {{> call contractName=../contractName}}
-    {{/this.constant}}
-    {{^this.constant}}
-    {{> tx contractName=../contractName}}
-    {{/this.constant}}
-{{/each}}
-    constructor(web3ContractInstance: Web3.ContractInstance, defaults?: Partial<TxData>) {
-        super(web3ContractInstance, defaults);
-        classUtils.bindAll(this, ['_web3ContractInstance', '_defaults']);
-    }
-} // tslint:disable:max-file-line-count
diff --git a/packages/contracts/contract_templates/partials/call.handlebars b/packages/contracts/contract_templates/partials/call.handlebars
deleted file mode 100644
index 82a45b40e..000000000
--- a/packages/contracts/contract_templates/partials/call.handlebars
+++ /dev/null
@@ -1,10 +0,0 @@
-public async {{this.name}}(
-{{> typed_params inputs=inputs}}
-    defaultBlock?: Web3.BlockParam,
-): Promise<{{> return_type outputs=outputs}}> {
-    const self = this as {{contractName}}Contract;
-    const result = await self._web3ContractInstance.{{this.name}}.call(
-        {{> params inputs=inputs}}
-    );
-    return result;
-}
diff --git a/packages/contracts/contract_templates/partials/params.handlebars b/packages/contracts/contract_templates/partials/params.handlebars
deleted file mode 100644
index ac5d4ae85..000000000
--- a/packages/contracts/contract_templates/partials/params.handlebars
+++ /dev/null
@@ -1,3 +0,0 @@
-{{#each inputs}}
-{{name}},
-{{/each}}
diff --git a/packages/contracts/contract_templates/partials/return_type.handlebars b/packages/contracts/contract_templates/partials/return_type.handlebars
deleted file mode 100644
index 40a5dd8b0..000000000
--- a/packages/contracts/contract_templates/partials/return_type.handlebars
+++ /dev/null
@@ -1,10 +0,0 @@
-{{#if outputs.length}}
-{{#singleReturnValue}}
-{{#returnType outputs.0.type}}{{/returnType}}
-{{/singleReturnValue}}
-{{^singleReturnValue}}
-[{{#each outputs}}{{#returnType type}}{{/returnType}}{{#unless @last}}, {{/unless}}{{/each}}]
-{{/singleReturnValue}}
-{{else}}
-void
-{{/if}}
diff --git a/packages/contracts/contract_templates/partials/tx.handlebars b/packages/contracts/contract_templates/partials/tx.handlebars
deleted file mode 100644
index 69ae982d6..000000000
--- a/packages/contracts/contract_templates/partials/tx.handlebars
+++ /dev/null
@@ -1,36 +0,0 @@
-public {{this.name}} = {
-    async sendTransactionAsync(
-    {{> typed_params inputs=inputs}}
-    {{#this.payable}}
-        txData: TxDataPayable = {},
-    {{/this.payable}}
-    {{^this.payable}}
-        txData: TxData = {},
-    {{/this.payable}}
-    ): Promise<string> {
-        const self = this as {{contractName}}Contract;
-        const txDataWithDefaults = await self._applyDefaultsToTxDataAsync(txData);
-        const txHash = await self._web3ContractInstance.{{this.name}}(
-            {{> params inputs=inputs}}
-            txDataWithDefaults,
-        );
-        return txHash;
-    },
-    async callAsync(
-    {{> typed_params inputs=inputs}}
-    {{#this.payable}}
-        txData: TxDataPayable = {},
-    {{/this.payable}}
-    {{^this.payable}}
-        txData: TxData = {},
-    {{/this.payable}}
-    ): Promise<{{> return_type outputs=outputs}}> {
-        const self = this as {{contractName}}Contract;
-        const txDataWithDefaults = await self._applyDefaultsToTxDataAsync(txData);
-        const returnValue = await self._web3ContractInstance.{{this.name}}.call(
-            {{> params inputs=inputs}}
-            txDataWithDefaults,
-        );
-        return returnValue;
-    },
-};
diff --git a/packages/contracts/contract_templates/partials/typed_params.handlebars b/packages/contracts/contract_templates/partials/typed_params.handlebars
deleted file mode 100644
index 3ea4b2e95..000000000
--- a/packages/contracts/contract_templates/partials/typed_params.handlebars
+++ /dev/null
@@ -1,3 +0,0 @@
-{{#each inputs}}
-    {{name}}: {{#parameterType type}}{{/parameterType}},
-{{/each}}
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index 6655df86f..7cac30069 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -17,7 +17,7 @@
         "compile:comment": "Yarn workspaces do not link binaries correctly so we need to reference them directly https://github.com/yarnpkg/yarn/issues/3846",
         "compile": "node ../deployer/lib/src/cli.js compile --contracts ${npm_package_config_contracts} --contracts-dir src/contracts --artifacts-dir src/artifacts",
         "clean": "shx rm -rf ./lib",
-        "generate_contract_wrappers": "node ../abi-gen/lib/index.js --abis 'src/artifacts/@(DummyToken|TokenTransferProxy|Exchange|TokenRegistry|MultiSigWallet|MultiSigWalletWithTimeLock|MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress|TokenRegistry|ZRXToken).json' --template contract_templates/contract.handlebars --partials 'contract_templates/partials/**/*.handlebars' --output src/contract_wrappers/generated",
+        "generate_contract_wrappers": "node ../abi-gen/lib/index.js --abis 'src/artifacts/@(DummyToken|TokenTransferProxy|Exchange|TokenRegistry|MultiSigWallet|MultiSigWalletWithTimeLock|MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress|TokenRegistry|ZRXToken).json' --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/contract_wrappers/generated --backend ethers && prettier --write 'src/contract_wrappers/generated/**.ts'",
         "migrate": "node ../deployer/lib/src/cli.js migrate",
         "lint": "tslint --project . 'migrations/**/*.ts' 'test/**/*.ts' 'util/**/*.ts' 'deploy/**/*.ts'",
         "test:circleci": "yarn test"
@@ -38,7 +38,6 @@
     "devDependencies": {
         "@0xproject/dev-utils": "^0.1.0",
         "@0xproject/tslint-config": "^0.4.9",
-        "@0xproject/types": "^0.2.3",
         "@types/bluebird": "^3.5.3",
         "@types/lodash": "^4.14.86",
         "@types/node": "^8.0.53",
@@ -59,19 +58,23 @@
         "types-bn": "^0.0.1",
         "types-ethereumjs-util": "0xProject/types-ethereumjs-util",
         "typescript": "2.7.1",
+        "ethers-typescript-typings": "^0.0.1",
         "web3-typescript-typings": "^0.9.11",
         "yargs": "^10.0.3"
     },
     "dependencies": {
         "0x.js": "^0.32.4",
+        "@0xproject/web3-wrapper": "^0.1.14",
         "@0xproject/deployer": "^0.1.0",
         "@0xproject/json-schemas": "^0.7.12",
+        "@0xproject/types": "^0.2.3",
         "@0xproject/utils": "^0.3.4",
         "@0xproject/web3-wrapper": "^0.1.14",
         "bluebird": "^3.5.0",
         "bn.js": "^4.11.8",
         "ethereumjs-abi": "^0.6.4",
         "ethereumjs-util": "^5.1.1",
+        "ethers-contracts": "^2.2.1",
         "isomorphic-fetch": "^2.2.1",
         "lodash": "^4.17.4",
         "request": "^2.81.0",
diff --git a/packages/contracts/src/contract_wrappers/generated/.gitignore b/packages/contracts/src/contract_wrappers/generated/.gitignore
index b976a8737..72e8ffc0d 100644
--- a/packages/contracts/src/contract_wrappers/generated/.gitignore
+++ b/packages/contracts/src/contract_wrappers/generated/.gitignore
@@ -1,8 +1 @@
-dummy_token.ts
-exchange.ts
-multi_sig_wallet_with_time_lock_except_remove_authorized_address.ts
-multi_sig_wallet_with_time_lock.ts
-multi_sig_wallet.ts
-token_registry.ts
-token_transfer_proxy.ts
-zrx_token.ts
+*
diff --git a/packages/contracts/src/contract_wrappers/generated/base_contract.ts b/packages/contracts/src/contract_wrappers/generated/base_contract.ts
deleted file mode 100644
index 2d77b3ab1..000000000
--- a/packages/contracts/src/contract_wrappers/generated/base_contract.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import {TxData, TxDataPayable} from '@0xproject/types';
-import * as _ from 'lodash';
-import * as Web3 from 'web3';
-
-export class BaseContract {
-    public address: string;
-    protected _web3ContractInstance: Web3.ContractInstance;
-    protected _defaults: Partial<TxData>;
-    protected async _applyDefaultsToTxDataAsync<T extends TxData|TxDataPayable>(
-        txData: T,
-        estimateGasAsync?: (txData: T) => Promise<number>,
-    ): Promise<TxData> {
-        // Gas amount sourced with the following priorities:
-        // 1. Optional param passed in to public method call
-        // 2. Global config passed in at library instantiation
-        // 3. Gas estimate calculation + safety margin
-        const removeUndefinedProperties = _.pickBy;
-        const txDataWithDefaults = {
-            ...removeUndefinedProperties(this._defaults),
-            ...removeUndefinedProperties(txData as any),
-            // HACK: TS can't prove that T is spreadable.
-            // Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
-        };
-        if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
-            const estimatedGas = await estimateGasAsync(txData);
-            txDataWithDefaults.gas = estimatedGas;
-        }
-        return txDataWithDefaults;
-    }
-    constructor(web3ContractInstance: Web3.ContractInstance, defaults?: Partial<TxData>) {
-        this.address = web3ContractInstance.address;
-        this._web3ContractInstance = web3ContractInstance;
-        this._defaults = defaults || {};
-    }
-}
diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 9cfc68418..303d745aa 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -1,12 +1,4 @@
-import {
-    LogCancelContractEventArgs,
-    LogErrorContractEventArgs,
-    LogFillContractEventArgs,
-    LogWithDecodedArgs,
-    SignedOrder,
-    TransactionReceiptWithDecodedLogs,
-    ZeroEx,
-} from '0x.js';
+import { LogWithDecodedArgs, SignedOrder, TransactionReceiptWithDecodedLogs, ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -15,7 +7,12 @@ import ethUtil = require('ethereumjs-util');
 import * as Web3 from 'web3';
 
 import { DummyTokenContract } from '../../src/contract_wrappers/generated/dummy_token';
-import { ExchangeContract } from '../../src/contract_wrappers/generated/exchange';
+import {
+    ExchangeContract,
+    LogCancelContractEventArgs,
+    LogErrorContractEventArgs,
+    LogFillContractEventArgs,
+} from '../../src/contract_wrappers/generated/exchange';
 import { TokenTransferProxyContract } from '../../src/contract_wrappers/generated/token_transfer_proxy';
 import { Balances } from '../../util/balances';
 import { constants } from '../../util/constants';
@@ -63,16 +60,20 @@ describe('Exchange', () => {
             deployer.deployAsync(ContractName.DummyToken),
             deployer.deployAsync(ContractName.DummyToken),
         ]);
-        rep = new DummyTokenContract(repInstance);
-        dgd = new DummyTokenContract(dgdInstance);
-        zrx = new DummyTokenContract(zrxInstance);
+        rep = new DummyTokenContract(web3Wrapper, repInstance.abi, repInstance.address);
+        dgd = new DummyTokenContract(web3Wrapper, dgdInstance.abi, dgdInstance.address);
+        zrx = new DummyTokenContract(web3Wrapper, zrxInstance.abi, zrxInstance.address);
         const tokenTransferProxyInstance = await deployer.deployAsync(ContractName.TokenTransferProxy);
-        tokenTransferProxy = new TokenTransferProxyContract(tokenTransferProxyInstance);
+        tokenTransferProxy = new TokenTransferProxyContract(
+            web3Wrapper,
+            tokenTransferProxyInstance.abi,
+            tokenTransferProxyInstance.address,
+        );
         const exchangeInstance = await deployer.deployAsync(ContractName.Exchange, [
             zrx.address,
             tokenTransferProxy.address,
         ]);
-        exchange = new ExchangeContract(exchangeInstance);
+        exchange = new ExchangeContract(web3Wrapper, exchangeInstance.abi, exchangeInstance.address);
         await tokenTransferProxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: accounts[0] });
         zeroEx = new ZeroEx(web3.currentProvider, {
             exchangeContractAddress: exchange.address,
@@ -650,7 +651,7 @@ describe('Exchange', () => {
 
         it('should not change balances if makerTokenAddress is ZRX, makerTokenAmount + makerFee > maker allowance, \
                 and shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
-            const makerZRXAllowance = await zrx.allowance(maker, tokenTransferProxy.address);
+            const makerZRXAllowance = await zrx.allowance.callAsync(maker, tokenTransferProxy.address);
             signedOrder = await orderFactory.newSignedOrderAsync({
                 makerTokenAddress: zrx.address,
                 makerTokenAmount: new BigNumber(makerZRXAllowance),
@@ -676,7 +677,7 @@ describe('Exchange', () => {
 
         it('should not change balances if takerTokenAddress is ZRX, takerTokenAmount + takerFee > taker allowance, \
                 and shouldThrowOnInsufficientBalanceOrAllowance = false', async () => {
-            const takerZRXAllowance = await zrx.allowance(taker, tokenTransferProxy.address);
+            const takerZRXAllowance = await zrx.allowance.callAsync(taker, tokenTransferProxy.address);
             signedOrder = await orderFactory.newSignedOrderAsync({
                 takerTokenAddress: zrx.address,
                 takerTokenAmount: new BigNumber(takerZRXAllowance),
@@ -723,7 +724,7 @@ describe('Exchange', () => {
             const res = await exWrapper.fillOrderAsync(signedOrder, taker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
-            const errCode = log.args.errorId.toNumber();
+            const errCode = log.args.errorId;
             expect(errCode).to.be.equal(ExchangeContractErrs.ERROR_ORDER_EXPIRED);
         });
 
@@ -734,7 +735,7 @@ describe('Exchange', () => {
             const res = await exWrapper.fillOrderAsync(signedOrder, taker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
-            const errCode = log.args.errorId.toNumber();
+            const errCode = log.args.errorId;
             expect(errCode).to.be.equal(ExchangeContractErrs.ERROR_ORDER_FULLY_FILLED_OR_CANCELLED);
         });
     });
@@ -862,7 +863,7 @@ describe('Exchange', () => {
             const res = await exWrapper.cancelOrderAsync(signedOrder, maker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
-            const errCode = log.args.errorId.toNumber();
+            const errCode = log.args.errorId;
             expect(errCode).to.be.equal(ExchangeContractErrs.ERROR_ORDER_FULLY_FILLED_OR_CANCELLED);
         });
 
@@ -874,7 +875,7 @@ describe('Exchange', () => {
             const res = await exWrapper.cancelOrderAsync(signedOrder, maker);
             expect(res.logs).to.have.length(1);
             const log = res.logs[0] as LogWithDecodedArgs<LogErrorContractEventArgs>;
-            const errCode = log.args.errorId.toNumber();
+            const errCode = log.args.errorId;
             expect(errCode).to.be.equal(ExchangeContractErrs.ERROR_ORDER_EXPIRED);
         });
     });
diff --git a/packages/contracts/test/exchange/helpers.ts b/packages/contracts/test/exchange/helpers.ts
index 5fe00225e..9869c2155 100644
--- a/packages/contracts/test/exchange/helpers.ts
+++ b/packages/contracts/test/exchange/helpers.ts
@@ -5,7 +5,12 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 
-import { ExchangeContract } from '../../src/contract_wrappers/generated/exchange';
+import {
+    ExchangeContract,
+    LogCancelContractEventArgs,
+    LogErrorContractEventArgs,
+    LogFillContractEventArgs,
+} from '../../src/contract_wrappers/generated/exchange';
 import { constants } from '../../util/constants';
 import { ExchangeWrapper } from '../../util/exchange_wrapper';
 import { OrderFactory } from '../../util/order_factory';
@@ -42,7 +47,7 @@ describe('Exchange', () => {
             zrx.address,
             tokenTransferProxy.address,
         ]);
-        const exchange = new ExchangeContract(exchangeInstance);
+        const exchange = new ExchangeContract(web3Wrapper, exchangeInstance.abi, exchangeInstance.address);
         await tokenTransferProxy.addAuthorizedAddress(exchange.address, { from: accounts[0] });
         const zeroEx = new ZeroEx(web3.currentProvider, { networkId: constants.TESTRPC_NETWORK_ID });
         exchangeWrapper = new ExchangeWrapper(exchange, zeroEx);
@@ -50,8 +55,8 @@ describe('Exchange', () => {
             exchangeContractAddress: exchange.address,
             maker,
             feeRecipient,
-            makerToken: rep.address,
-            takerToken: dgd.address,
+            makerTokenAddress: rep.address,
+            takerTokenAddress: dgd.address,
             makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
             takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
             makerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index bf5a89222..4ea40cb59 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -7,7 +7,12 @@ import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
 import { DummyTokenContract } from '../../src/contract_wrappers/generated/dummy_token';
-import { ExchangeContract } from '../../src/contract_wrappers/generated/exchange';
+import {
+    ExchangeContract,
+    LogCancelContractEventArgs,
+    LogErrorContractEventArgs,
+    LogFillContractEventArgs,
+} from '../../src/contract_wrappers/generated/exchange';
 import { TokenRegistryContract } from '../../src/contract_wrappers/generated/token_registry';
 import { TokenTransferProxyContract } from '../../src/contract_wrappers/generated/token_transfer_proxy';
 import { Balances } from '../../util/balances';
@@ -55,18 +60,26 @@ describe('Exchange', () => {
             deployer.deployAsync(ContractName.DummyToken),
             deployer.deployAsync(ContractName.DummyToken),
         ]);
-        rep = new DummyTokenContract(repInstance);
-        dgd = new DummyTokenContract(dgdInstance);
-        zrx = new DummyTokenContract(zrxInstance);
+        rep = new DummyTokenContract(web3Wrapper, repInstance.abi, repInstance.address);
+        dgd = new DummyTokenContract(web3Wrapper, dgdInstance.abi, dgdInstance.address);
+        zrx = new DummyTokenContract(web3Wrapper, zrxInstance.abi, zrxInstance.address);
         const tokenRegistryInstance = await deployer.deployAsync(ContractName.TokenRegistry);
-        tokenRegistry = new TokenRegistryContract(tokenRegistryInstance);
+        tokenRegistry = new TokenRegistryContract(
+            web3Wrapper,
+            tokenRegistryInstance.abi,
+            tokenRegistryInstance.address,
+        );
         const tokenTransferProxyInstance = await deployer.deployAsync(ContractName.TokenTransferProxy);
-        tokenTransferProxy = new TokenTransferProxyContract(tokenTransferProxyInstance);
+        tokenTransferProxy = new TokenTransferProxyContract(
+            web3Wrapper,
+            tokenTransferProxyInstance.abi,
+            tokenTransferProxyInstance.address,
+        );
         const exchangeInstance = await deployer.deployAsync(ContractName.Exchange, [
             zrx.address,
             tokenTransferProxy.address,
         ]);
-        exchange = new ExchangeContract(exchangeInstance);
+        exchange = new ExchangeContract(web3Wrapper, exchangeInstance.abi, exchangeInstance.address);
         await tokenTransferProxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: accounts[0] });
         const zeroEx = new ZeroEx(web3.currentProvider, { networkId: constants.TESTRPC_NETWORK_ID });
         exWrapper = new ExchangeWrapper(exchange, zeroEx);
diff --git a/packages/contracts/test/multi_sig_with_time_lock.ts b/packages/contracts/test/multi_sig_with_time_lock.ts
index 6812cb09f..a726814e4 100644
--- a/packages/contracts/test/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock.ts
@@ -59,10 +59,14 @@ describe('MultiSigWalletWithTimeLock', () => {
                     SIGNATURES_REQUIRED,
                     0,
                 ]);
-                multiSig = new MultiSigWalletWithTimeLockContract(multiSigInstance);
+                multiSig = new MultiSigWalletWithTimeLockContract(
+                    web3Wrapper,
+                    multiSigInstance.abi,
+                    multiSigInstance.address,
+                );
                 multiSigWrapper = new MultiSigWrapper((multiSig as any) as MultiSigWalletContract);
 
-                const secondsTimeLocked = await multiSig.secondsTimeLocked();
+                const secondsTimeLocked = await multiSig.secondsTimeLocked.callAsync();
                 initialSecondsTimeLocked = secondsTimeLocked.toNumber();
             });
             it('should throw when not called by wallet', async () => {
@@ -113,7 +117,7 @@ describe('MultiSigWalletWithTimeLock', () => {
                 const blockNum = await web3Wrapper.getBlockNumberAsync();
                 const blockInfo = await web3Wrapper.getBlockAsync(blockNum);
                 const timestamp = new BigNumber(blockInfo.timestamp);
-                const confirmationTimeBigNum = new BigNumber(await multiSig.confirmationTimes(txId));
+                const confirmationTimeBigNum = new BigNumber(await multiSig.confirmationTimes.callAsync(txId));
 
                 expect(timestamp).to.be.bignumber.equal(confirmationTimeBigNum);
             });
@@ -141,7 +145,7 @@ describe('MultiSigWalletWithTimeLock', () => {
                 const res = await zeroEx.awaitTransactionMinedAsync(txHash);
                 expect(res.logs).to.have.length(2);
 
-                const secondsTimeLocked = new BigNumber(await multiSig.secondsTimeLocked());
+                const secondsTimeLocked = new BigNumber(await multiSig.secondsTimeLocked.callAsync());
                 expect(secondsTimeLocked).to.be.bignumber.equal(SECONDS_TIME_LOCKED);
             });
         });
@@ -152,10 +156,14 @@ describe('MultiSigWalletWithTimeLock', () => {
                     SIGNATURES_REQUIRED,
                     SECONDS_TIME_LOCKED,
                 ]);
-                multiSig = new MultiSigWalletWithTimeLockContract(multiSigInstance);
+                multiSig = new MultiSigWalletWithTimeLockContract(
+                    web3Wrapper,
+                    multiSigInstance.abi,
+                    multiSigInstance.address,
+                );
                 multiSigWrapper = new MultiSigWrapper((multiSig as any) as MultiSigWalletContract);
 
-                const secondsTimeLocked = await multiSig.secondsTimeLocked();
+                const secondsTimeLocked = await multiSig.secondsTimeLocked.callAsync();
                 initialSecondsTimeLocked = secondsTimeLocked.toNumber();
                 const destination = multiSig.address;
                 const from = owners[0];
@@ -187,7 +195,7 @@ describe('MultiSigWalletWithTimeLock', () => {
                 await rpc.increaseTimeAsync(SECONDS_TIME_LOCKED.toNumber());
                 await multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] });
 
-                const secondsTimeLocked = new BigNumber(await multiSig.secondsTimeLocked());
+                const secondsTimeLocked = new BigNumber(await multiSig.secondsTimeLocked.callAsync());
                 expect(secondsTimeLocked).to.be.bignumber.equal(newSecondsTimeLocked);
             });
         });
diff --git a/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts b/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts
index 7e9d44730..c0299e1e1 100644
--- a/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts
@@ -49,7 +49,11 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
         [authorizedAddress, unauthorizedAddress] = accounts;
         const initialOwner = accounts[0];
         const tokenTransferProxyInstance = await deployer.deployAsync(ContractName.TokenTransferProxy);
-        tokenTransferProxy = new TokenTransferProxyContract(tokenTransferProxyInstance);
+        tokenTransferProxy = new TokenTransferProxyContract(
+            web3Wrapper,
+            tokenTransferProxyInstance.abi,
+            tokenTransferProxyInstance.address,
+        );
         await tokenTransferProxy.addAuthorizedAddress.sendTransactionAsync(authorizedAddress, {
             from: initialOwner,
         });
@@ -57,7 +61,11 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
             ContractName.MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress,
             [owners, requiredApprovals, SECONDS_TIME_LOCKED, tokenTransferProxy.address],
         );
-        multiSig = new MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressContract(multiSigInstance);
+        multiSig = new MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressContract(
+            web3Wrapper,
+            multiSigInstance.abi,
+            multiSigInstance.address,
+        );
         await tokenTransferProxy.transferOwnership.sendTransactionAsync(multiSig.address, {
             from: initialOwner,
         });
@@ -74,12 +82,14 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
     describe('isFunctionRemoveAuthorizedAddress', () => {
         it('should throw if data is not for removeAuthorizedAddress', async () => {
             const data = MultiSigWrapper.encodeFnArgs('addAuthorizedAddress', PROXY_ABI, [owners[0]]);
-            return expect(multiSig.isFunctionRemoveAuthorizedAddress(data)).to.be.rejectedWith(constants.REVERT);
+            return expect(multiSig.isFunctionRemoveAuthorizedAddress.callAsync(data)).to.be.rejectedWith(
+                constants.REVERT,
+            );
         });
 
         it('should return true if data is for removeAuthorizedAddress', async () => {
             const data = MultiSigWrapper.encodeFnArgs('removeAuthorizedAddress', PROXY_ABI, [owners[0]]);
-            const isFunctionRemoveAuthorizedAddress = await multiSig.isFunctionRemoveAuthorizedAddress(data);
+            const isFunctionRemoveAuthorizedAddress = await multiSig.isFunctionRemoveAuthorizedAddress.callAsync(data);
             expect(isFunctionRemoveAuthorizedAddress).to.be.true();
         });
     });
@@ -114,7 +124,7 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
             const log = abiDecoder.tryToDecodeLogOrNoop(res.logs[0]) as LogWithDecodedArgs<SubmissionContractEventArgs>;
             const txId = log.args.transactionId;
             await multiSig.confirmTransaction.sendTransactionAsync(txId, { from: owners[1] });
-            const isConfirmed = await multiSig.isConfirmed(txId);
+            const isConfirmed = await multiSig.isConfirmed.callAsync(txId);
             expect(isConfirmed).to.be.true();
 
             return expect(
@@ -133,7 +143,7 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
             const log = abiDecoder.tryToDecodeLogOrNoop(res.logs[0]) as LogWithDecodedArgs<SubmissionContractEventArgs>;
             const txId = log.args.transactionId;
             await multiSig.confirmTransaction.sendTransactionAsync(txId, { from: owners[1] });
-            const isConfirmed = await multiSig.isConfirmed(txId);
+            const isConfirmed = await multiSig.isConfirmed.callAsync(txId);
             expect(isConfirmed).to.be.true();
 
             return expect(
@@ -152,10 +162,10 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
             const log = abiDecoder.tryToDecodeLogOrNoop(res.logs[0]) as LogWithDecodedArgs<SubmissionContractEventArgs>;
             const txId = log.args.transactionId;
             await multiSig.confirmTransaction.sendTransactionAsync(txId, { from: owners[1] });
-            const isConfirmed = await multiSig.isConfirmed(txId);
+            const isConfirmed = await multiSig.isConfirmed.callAsync(txId);
             expect(isConfirmed).to.be.true();
             await multiSig.executeRemoveAuthorizedAddress.sendTransactionAsync(txId, { from: owners[1] });
-            const isAuthorized = await tokenTransferProxy.authorized(authorizedAddress);
+            const isAuthorized = await tokenTransferProxy.authorized.callAsync(authorizedAddress);
             expect(isAuthorized).to.be.false();
         });
 
@@ -170,10 +180,10 @@ describe('MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress', () => {
             const log = abiDecoder.tryToDecodeLogOrNoop(res.logs[0]) as LogWithDecodedArgs<SubmissionContractEventArgs>;
             const txId = log.args.transactionId;
             await multiSig.confirmTransaction.sendTransactionAsync(txId, { from: owners[1] });
-            const isConfirmed = await multiSig.isConfirmed(txId);
+            const isConfirmed = await multiSig.isConfirmed.callAsync(txId);
             expect(isConfirmed).to.be.true();
             await multiSig.executeRemoveAuthorizedAddress.sendTransactionAsync(txId, { from: owners[1] });
-            const tx = await multiSig.transactions(txId);
+            const tx = await multiSig.transactions.callAsync(txId);
             const isExecuted = tx[3];
             expect(isExecuted).to.be.true();
             return expect(
diff --git a/packages/contracts/test/token_registry.ts b/packages/contracts/test/token_registry.ts
index 867282d2c..eee14ad9f 100644
--- a/packages/contracts/test/token_registry.ts
+++ b/packages/contracts/test/token_registry.ts
@@ -31,7 +31,7 @@ describe('TokenRegistry', () => {
         owner = accounts[0];
         notOwner = accounts[1];
         const tokenRegInstance = await deployer.deployAsync(ContractName.TokenRegistry);
-        tokenReg = new TokenRegistryContract(tokenRegInstance);
+        tokenReg = new TokenRegistryContract(web3Wrapper, tokenRegInstance.abi, tokenRegInstance.address);
         tokenRegWrapper = new TokenRegWrapper(tokenReg);
     });
     beforeEach(async () => {
diff --git a/packages/contracts/test/token_transfer_proxy/auth.ts b/packages/contracts/test/token_transfer_proxy/auth.ts
index 9d453b079..4f497dd0d 100644
--- a/packages/contracts/test/token_transfer_proxy/auth.ts
+++ b/packages/contracts/test/token_transfer_proxy/auth.ts
@@ -25,7 +25,11 @@ describe('TokenTransferProxy', () => {
         owner = address = accounts[0];
         notOwner = accounts[1];
         const tokenTransferProxyInstance = await deployer.deployAsync(ContractName.TokenTransferProxy);
-        tokenTransferProxy = new TokenTransferProxyContract(tokenTransferProxyInstance);
+        tokenTransferProxy = new TokenTransferProxyContract(
+            web3Wrapper,
+            tokenTransferProxyInstance.abi,
+            tokenTransferProxyInstance.address,
+        );
     });
     beforeEach(async () => {
         await blockchainLifecycle.startAsync();
@@ -41,7 +45,7 @@ describe('TokenTransferProxy', () => {
         });
         it('should allow owner to add an authorized address', async () => {
             await tokenTransferProxy.addAuthorizedAddress.sendTransactionAsync(address, { from: owner });
-            const isAuthorized = await tokenTransferProxy.authorized(address);
+            const isAuthorized = await tokenTransferProxy.authorized.callAsync(address);
             expect(isAuthorized).to.be.true();
         });
         it('should throw if owner attempts to authorize a duplicate address', async () => {
@@ -67,7 +71,7 @@ describe('TokenTransferProxy', () => {
             await tokenTransferProxy.removeAuthorizedAddress.sendTransactionAsync(address, {
                 from: owner,
             });
-            const isAuthorized = await tokenTransferProxy.authorized(address);
+            const isAuthorized = await tokenTransferProxy.authorized.callAsync(address);
             expect(isAuthorized).to.be.false();
         });
 
@@ -82,19 +86,19 @@ describe('TokenTransferProxy', () => {
 
     describe('getAuthorizedAddresses', () => {
         it('should return all authorized addresses', async () => {
-            const initial = await tokenTransferProxy.getAuthorizedAddresses();
+            const initial = await tokenTransferProxy.getAuthorizedAddresses.callAsync();
             expect(initial).to.have.length(0);
             await tokenTransferProxy.addAuthorizedAddress.sendTransactionAsync(address, {
                 from: owner,
             });
-            const afterAdd = await tokenTransferProxy.getAuthorizedAddresses();
+            const afterAdd = await tokenTransferProxy.getAuthorizedAddresses.callAsync();
             expect(afterAdd).to.have.length(1);
             expect(afterAdd).to.include(address);
 
             await tokenTransferProxy.removeAuthorizedAddress.sendTransactionAsync(address, {
                 from: owner,
             });
-            const afterRemove = await tokenTransferProxy.getAuthorizedAddresses();
+            const afterRemove = await tokenTransferProxy.getAuthorizedAddresses.callAsync();
             expect(afterRemove).to.have.length(0);
         });
     });
diff --git a/packages/contracts/test/token_transfer_proxy/transfer_from.ts b/packages/contracts/test/token_transfer_proxy/transfer_from.ts
index c35a7276a..6b86a0e97 100644
--- a/packages/contracts/test/token_transfer_proxy/transfer_from.ts
+++ b/packages/contracts/test/token_transfer_proxy/transfer_from.ts
@@ -33,9 +33,13 @@ describe('TokenTransferProxy', () => {
         accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = notAuthorized = accounts[0];
         const tokenTransferProxyInstance = await deployer.deployAsync(ContractName.TokenTransferProxy);
-        tokenTransferProxy = new TokenTransferProxyContract(tokenTransferProxyInstance);
+        tokenTransferProxy = new TokenTransferProxyContract(
+            web3Wrapper,
+            tokenTransferProxyInstance.abi,
+            tokenTransferProxyInstance.address,
+        );
         const repInstance = await deployer.deployAsync(ContractName.DummyToken);
-        rep = new DummyTokenContract(repInstance);
+        rep = new DummyTokenContract(web3Wrapper, repInstance.abi, repInstance.address);
 
         dmyBalances = new Balances([rep], [accounts[0], accounts[1]]);
         await Promise.all([
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index f0a66e76b..03eb581ad 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -35,7 +35,7 @@ describe('UnlimitedAllowanceToken', () => {
         owner = accounts[0];
         spender = accounts[1];
         const tokenInstance = await deployer.deployAsync(ContractName.DummyToken);
-        token = new DummyTokenContract(tokenInstance);
+        token = new DummyTokenContract(web3Wrapper, tokenInstance.abi, tokenInstance.address);
         await token.mint.sendTransactionAsync(MAX_MINT_VALUE, { from: owner });
         tokenAddress = token.address;
     });
diff --git a/packages/contracts/test/zrx_token.ts b/packages/contracts/test/zrx_token.ts
index 1610ada12..4ccc66b36 100644
--- a/packages/contracts/test/zrx_token.ts
+++ b/packages/contracts/test/zrx_token.ts
@@ -36,7 +36,7 @@ describe('ZRXToken', () => {
             networkId: constants.TESTRPC_NETWORK_ID,
         });
         const zrxInstance = await deployer.deployAsync(ContractName.ZRXToken);
-        zrx = new ZRXTokenContract(zrxInstance);
+        zrx = new ZRXTokenContract(web3Wrapper, zrxInstance.abi, zrxInstance.address);
         zrxAddress = zrx.address;
         MAX_UINT = zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
     });
@@ -48,25 +48,25 @@ describe('ZRXToken', () => {
     });
     describe('constants', () => {
         it('should have 18 decimals', async () => {
-            const decimals = new BigNumber(await zrx.decimals());
+            const decimals = new BigNumber(await zrx.decimals.callAsync());
             const expectedDecimals = 18;
             expect(decimals).to.be.bignumber.equal(expectedDecimals);
         });
 
         it('should have a total supply of 1 billion tokens', async () => {
-            const totalSupply = new BigNumber(await zrx.totalSupply());
+            const totalSupply = new BigNumber(await zrx.totalSupply.callAsync());
             const expectedTotalSupply = 1000000000;
             expect(ZeroEx.toUnitAmount(totalSupply, 18)).to.be.bignumber.equal(expectedTotalSupply);
         });
 
         it('should be named 0x Protocol Token', async () => {
-            const name = await zrx.name();
+            const name = await zrx.name.callAsync();
             const expectedName = '0x Protocol Token';
             expect(name).to.be.equal(expectedName);
         });
 
         it('should have the symbol ZRX', async () => {
-            const symbol = await zrx.symbol();
+            const symbol = await zrx.symbol.callAsync();
             const expectedSymbol = 'ZRX';
             expect(symbol).to.be.equal(expectedSymbol);
         });
@@ -75,7 +75,7 @@ describe('ZRXToken', () => {
     describe('constructor', () => {
         it('should initialize owner balance to totalSupply', async () => {
             const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
-            const totalSupply = new BigNumber(await zrx.totalSupply());
+            const totalSupply = new BigNumber(await zrx.totalSupply.callAsync());
             expect(totalSupply).to.be.bignumber.equal(ownerBalance);
         });
     });
diff --git a/packages/contracts/tsconfig.json b/packages/contracts/tsconfig.json
index b618ca4e7..490531eeb 100644
--- a/packages/contracts/tsconfig.json
+++ b/packages/contracts/tsconfig.json
@@ -11,6 +11,7 @@
         "../../node_modules/types-ethereumjs-util/index.d.ts",
         "../../node_modules/chai-typescript-typings/index.d.ts",
         "../../node_modules/web3-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts",
         "../../node_modules/chai-as-promised-typescript-typings/index.d.ts",
         "../../node_modules/types-ethereumjs-util/index.d.ts",
         "../../node_modules/types-bn/index.d.ts",
diff --git a/packages/contracts/util/balances.ts b/packages/contracts/util/balances.ts
index 0abc305d8..d03d4b3c5 100644
--- a/packages/contracts/util/balances.ts
+++ b/packages/contracts/util/balances.ts
@@ -17,7 +17,7 @@ export class Balances {
         const balancesByOwner: BalancesByOwner = {};
         for (const tokenContractInstance of this._tokenContractInstances) {
             for (const ownerAddress of this._ownerAddresses) {
-                let balance = await tokenContractInstance.balanceOf(ownerAddress);
+                let balance = await tokenContractInstance.balanceOf.callAsync(ownerAddress);
                 balance = new BigNumber(balance);
                 if (_.isUndefined(balancesByOwner[ownerAddress])) {
                     balancesByOwner[ownerAddress] = {};
diff --git a/packages/contracts/util/exchange_wrapper.ts b/packages/contracts/util/exchange_wrapper.ts
index 03d04629d..f016067fe 100644
--- a/packages/contracts/util/exchange_wrapper.ts
+++ b/packages/contracts/util/exchange_wrapper.ts
@@ -186,11 +186,11 @@ export class ExchangeWrapper {
     public async getOrderHashAsync(signedOrder: SignedOrder): Promise<string> {
         const shouldThrowOnInsufficientBalanceOrAllowance = false;
         const params = signedOrderUtils.getOrderAddressesAndValues(signedOrder);
-        const orderHash = await this._exchange.getOrderHash(params.orderAddresses, params.orderValues);
+        const orderHash = await this._exchange.getOrderHash.callAsync(params.orderAddresses, params.orderValues);
         return orderHash;
     }
     public async isValidSignatureAsync(signedOrder: SignedOrder): Promise<boolean> {
-        const isValidSignature = await this._exchange.isValidSignature(
+        const isValidSignature = await this._exchange.isValidSignature.callAsync(
             signedOrder.maker,
             ZeroEx.getOrderHashHex(signedOrder),
             signedOrder.ecSignature.v,
@@ -204,7 +204,7 @@ export class ExchangeWrapper {
         denominator: BigNumber,
         target: BigNumber,
     ): Promise<boolean> {
-        const isRoundingError = await this._exchange.isRoundingError(numerator, denominator, target);
+        const isRoundingError = await this._exchange.isRoundingError.callAsync(numerator, denominator, target);
         return isRoundingError;
     }
     public async getPartialAmountAsync(
@@ -212,7 +212,9 @@ export class ExchangeWrapper {
         denominator: BigNumber,
         target: BigNumber,
     ): Promise<BigNumber> {
-        const partialAmount = new BigNumber(await this._exchange.getPartialAmount(numerator, denominator, target));
+        const partialAmount = new BigNumber(
+            await this._exchange.getPartialAmount.callAsync(numerator, denominator, target),
+        );
         return partialAmount;
     }
 }
diff --git a/packages/contracts/util/token_registry_wrapper.ts b/packages/contracts/util/token_registry_wrapper.ts
index d0af17103..d78c8a64e 100644
--- a/packages/contracts/util/token_registry_wrapper.ts
+++ b/packages/contracts/util/token_registry_wrapper.ts
@@ -22,36 +22,36 @@ export class TokenRegWrapper {
         return tx;
     }
     public async getTokenMetaDataAsync(tokenAddress: string) {
-        const data = await this._tokenReg.getTokenMetaData(tokenAddress);
+        const data = await this._tokenReg.getTokenMetaData.callAsync(tokenAddress);
         const token: Token = {
             address: data[0],
             name: data[1],
             symbol: data[2],
-            decimals: data[3].toNumber(),
+            decimals: data[3],
             ipfsHash: data[4],
             swarmHash: data[5],
         };
         return token;
     }
     public async getTokenByNameAsync(tokenName: string) {
-        const data = await this._tokenReg.getTokenByName(tokenName);
+        const data = await this._tokenReg.getTokenByName.callAsync(tokenName);
         const token: Token = {
             address: data[0],
             name: data[1],
             symbol: data[2],
-            decimals: data[3].toNumber(),
+            decimals: data[3],
             ipfsHash: data[4],
             swarmHash: data[5],
         };
         return token;
     }
     public async getTokenBySymbolAsync(tokenSymbol: string) {
-        const data = await this._tokenReg.getTokenBySymbol(tokenSymbol);
+        const data = await this._tokenReg.getTokenBySymbol.callAsync(tokenSymbol);
         const token: Token = {
             address: data[0],
             name: data[1],
             symbol: data[2],
-            decimals: data[3].toNumber(),
+            decimals: data[3],
             ipfsHash: data[4],
             swarmHash: data[5],
         };
diff --git a/packages/contracts/util/types.ts b/packages/contracts/util/types.ts
index 65bc26f79..d6e4c587d 100644
--- a/packages/contracts/util/types.ts
+++ b/packages/contracts/util/types.ts
@@ -41,8 +41,8 @@ export interface DefaultOrderParams {
     exchangeContractAddress: string;
     maker: string;
     feeRecipient: string;
-    makerToken: string;
-    takerToken: string;
+    makerTokenAddress: string;
+    takerTokenAddress: string;
     makerTokenAmount: BigNumber;
     takerTokenAmount: BigNumber;
     makerFee: BigNumber;
diff --git a/packages/deployer/package.json b/packages/deployer/package.json
index f969e4eda..2a6668fa6 100644
--- a/packages/deployer/package.json
+++ b/packages/deployer/package.json
@@ -36,6 +36,7 @@
         "tslint": "5.8.0",
         "types-bn": "^0.0.1",
         "typescript": "2.7.1",
+        "ethers-typescript-typings": "^0.0.1",
         "web3-typescript-typings": "^0.9.11"
     },
     "dependencies": {
diff --git a/packages/deployer/src/cli.ts b/packages/deployer/src/cli.ts
index ba156ac20..c976e8f97 100644
--- a/packages/deployer/src/cli.ts
+++ b/packages/deployer/src/cli.ts
@@ -10,8 +10,8 @@ import { constants } from './utils/constants';
 import { CliOptions, CompilerOptions, DeployerOptions } from './utils/types';
 
 const DEFAULT_OPTIMIZER_ENABLED = false;
-const DEFAULT_CONTRACTS_DIR = path.resolve('src');
-const DEFAULT_ARTIFACTS_DIR = path.resolve('artifacts');
+const DEFAULT_CONTRACTS_DIR = path.resolve('src/contracts');
+const DEFAULT_ARTIFACTS_DIR = path.resolve('src/artifacts');
 const DEFAULT_NETWORK_ID = 50;
 const DEFAULT_JSONRPC_PORT = 8545;
 const DEFAULT_GAS_PRICE = (10 ** 9 * 2).toString();
@@ -100,6 +100,9 @@ async function onDeployCommand(argv: CliOptions): Promise<void> {
  */
 function getContractsSetFromList(contracts: string): Set<string> {
     const specifiedContracts = new Set();
+    if (contracts === '*') {
+        return new Set(['*']);
+    }
     const contractsArray = contracts.split(',');
     _.forEach(contractsArray, contractName => {
         const fileName = `${contractName}${constants.SOLIDITY_FILE_EXTENSION}`;
diff --git a/packages/deployer/src/deployer.ts b/packages/deployer/src/deployer.ts
index 021645fd1..6710bcc85 100644
--- a/packages/deployer/src/deployer.ts
+++ b/packages/deployer/src/deployer.ts
@@ -174,7 +174,7 @@ export class Deployer {
         const block = await this.web3Wrapper.getBlockAsync('latest');
         let gas: number;
         try {
-            const gasEstimate: number = await this.web3Wrapper.estimateGasAsync(data);
+            const gasEstimate: number = await this.web3Wrapper.estimateGasAsync({ data });
             gas = Math.min(gasEstimate + EXTRA_GAS, block.gasLimit);
         } catch (err) {
             gas = block.gasLimit;
diff --git a/packages/deployer/tsconfig.json b/packages/deployer/tsconfig.json
index 4e1edb510..897446b66 100644
--- a/packages/deployer/tsconfig.json
+++ b/packages/deployer/tsconfig.json
@@ -11,6 +11,7 @@
         "../../node_modules/types-bn/index.d.ts",
         "../../node_modules/types-ethereumjs-util/index.d.ts",
         "../../node_modules/chai-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts",
         "../../node_modules/web3-typescript-typings/index.d.ts"
     ]
 }
diff --git a/packages/dev-utils/package.json b/packages/dev-utils/package.json
index 515edc353..dc6410211 100644
--- a/packages/dev-utils/package.json
+++ b/packages/dev-utils/package.json
@@ -24,7 +24,6 @@
     "homepage": "https://github.com/0xProject/0x.js/packages/dev-utils/README.md",
     "devDependencies": {
         "@0xproject/tslint-config": "^0.4.9",
-        "@0xproject/types": "^0.2.3",
         "@0xproject/web3-wrapper": "^0.1.14",
         "@types/lodash": "^4.14.86",
         "@types/mocha": "^2.2.42",
@@ -40,6 +39,7 @@
     },
     "dependencies": {
         "@0xproject/subproviders": "^0.5.0",
+        "@0xproject/types": "^0.2.3",
         "@0xproject/utils": "^0.3.4",
         "ethereumjs-util": "^5.1.2",
         "lodash": "^4.17.4",
diff --git a/packages/dev-utils/tsconfig.json b/packages/dev-utils/tsconfig.json
index ace978fea..1ed3fbc9c 100644
--- a/packages/dev-utils/tsconfig.json
+++ b/packages/dev-utils/tsconfig.json
@@ -8,6 +8,7 @@
         "./test/**/*",
         "../../node_modules/types-bn/index.d.ts",
         "../../node_modules/chai-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts",
         "../../node_modules/web3-typescript-typings/index.d.ts",
         "../../node_modules/types-ethereumjs-util/index.d.ts"
     ]
diff --git a/packages/ethers-typescript-typings/.npmignore b/packages/ethers-typescript-typings/.npmignore
new file mode 100644
index 000000000..104d718ed
--- /dev/null
+++ b/packages/ethers-typescript-typings/.npmignore
@@ -0,0 +1,3 @@
+.*
+yarn-error.log
+/scripts/
diff --git a/packages/ethers-typescript-typings/CHANGELOG.md b/packages/ethers-typescript-typings/CHANGELOG.md
new file mode 100644
index 000000000..d67d5c73d
--- /dev/null
+++ b/packages/ethers-typescript-typings/CHANGELOG.md
@@ -0,0 +1,5 @@
+# CHANGELOG
+
+## v0.0.1 - _TBD, 2018_
+
+    * Initial types (#413)
diff --git a/packages/ethers-typescript-typings/README.md b/packages/ethers-typescript-typings/README.md
new file mode 100644
index 000000000..56ce5f138
--- /dev/null
+++ b/packages/ethers-typescript-typings/README.md
@@ -0,0 +1,49 @@
+## ethers-typescript-typings
+
+There currently isn't an official [Ethers][ethers]
+type definition included in the [DefinitelyTyped][definitelytyped] project.
+Until that happens, we will continue to improve our own type definition.
+If it get's close to comprehensive, we'll add it to [DefinitelyTyped][definitelytyped].
+
+[ethers]: https://github.com/ethers-io/ethers.js
+[definitelytyped]: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+## Installation
+
+```bash
+yarn add -D ethers-typescript-typings
+```
+
+## Usage
+
+Add the following line within an `include` section of your `tsconfig.json`
+
+```json
+"./node_modules/ethers-typescript-typings/index.d.ts"
+```
+
+## Contributing
+
+We strongly encourage that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Lint
+
+```bash
+yarn lint
+```
diff --git a/packages/ethers-typescript-typings/index.d.ts b/packages/ethers-typescript-typings/index.d.ts
new file mode 100644
index 000000000..e5d38819e
--- /dev/null
+++ b/packages/ethers-typescript-typings/index.d.ts
@@ -0,0 +1,28 @@
+declare module 'ethers-contracts' {
+    export interface TransactionDescription {
+        name: string;
+        signature: string;
+        sighash: string;
+        data: string;
+    }
+    export interface CallDescription extends TransactionDescription {
+        parse: (...args: any[]) => any;
+    }
+    export interface FunctionDescription {
+        (...params: any[]): TransactionDescription | CallDescription;
+        inputs: { names: string[]; types: string[] };
+        outputs: { names: string[]; types: string[] };
+    }
+    export interface EventDescription {
+        parse: (...args: any[]) => any;
+        inputs: { names: string[]; types: string[] };
+        signature: string;
+        topic: string;
+    }
+    export class Interface {
+        public functions: { [functionName: string]: FunctionDescription };
+        public events: { [eventName: string]: EventDescription };
+        public static decodeParams(types: string[], data: string): any[];
+        constructor(abi: any);
+    }
+}
diff --git a/packages/ethers-typescript-typings/package.json b/packages/ethers-typescript-typings/package.json
new file mode 100644
index 000000000..0e6f517c8
--- /dev/null
+++ b/packages/ethers-typescript-typings/package.json
@@ -0,0 +1,28 @@
+{
+    "name": "ethers-typescript-typings",
+    "version": "0.0.1",
+    "description": "Typescript type definitions for ethers.js",
+    "main": "index.d.ts",
+    "types": "index.d.ts",
+    "scripts": {
+        "lint": "tslint index.d.ts"
+    },
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/0xProject/0x.js.git"
+    },
+    "author": "Fabio Berger",
+    "contributors": [
+        "Leonid Logvinov <logvinov.leon@gmail.com>"
+    ],
+    "license": "Apache-2.0",
+    "bugs": {
+        "url": "https://github.com/0xProject/0x.js/issues"
+    },
+    "homepage": "https://github.com/0xProject/0x.js/packages/ethers-typescript-typings#readme",
+    "devDependencies": {
+        "tslint": "5.8.0",
+        "tslint-config-0xproject": "^0.0.2",
+        "typescript": "2.7.1"
+    }
+}
diff --git a/packages/ethers-typescript-typings/scripts/postpublish.js b/packages/ethers-typescript-typings/scripts/postpublish.js
new file mode 100644
index 000000000..b3e5407c8
--- /dev/null
+++ b/packages/ethers-typescript-typings/scripts/postpublish.js
@@ -0,0 +1,5 @@
+const postpublish_utils = require('../../../scripts/postpublish_utils');
+const packageJSON = require('../package.json');
+
+const subPackageName = packageJSON.name;
+postpublish_utils.standardPostPublishAsync(subPackageName);
\ No newline at end of file
diff --git a/packages/ethers-typescript-typings/tslint.json b/packages/ethers-typescript-typings/tslint.json
new file mode 100644
index 000000000..9a93a1f74
--- /dev/null
+++ b/packages/ethers-typescript-typings/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": ["tslint-config-0xproject"]
+}
diff --git a/packages/json-schemas/CHANGELOG.md b/packages/json-schemas/CHANGELOG.md
index 9a9fc12de..7fdae6cf3 100644
--- a/packages/json-schemas/CHANGELOG.md
+++ b/packages/json-schemas/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## v0.7.10 - _February 9, 2018_
 
-* Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
+*   Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
 
 ## v0.7.0 - _December 20, 2017_
 
diff --git a/packages/subproviders/README.md b/packages/subproviders/README.md
index 954729713..39e4a46e7 100644
--- a/packages/subproviders/README.md
+++ b/packages/subproviders/README.md
@@ -96,10 +96,10 @@ yarn run test:unit
 
 In order to run the integration tests, make sure you have a Ledger Nano S available.
 
-* Plug it into your computer
-* Unlock the device
-* Open the on-device Ethereum app
-* Make sure "browser support" is disabled
+*   Plug it into your computer
+*   Unlock the device
+*   Open the on-device Ethereum app
+*   Make sure "browser support" is disabled
 
 Then run:
 
diff --git a/packages/subproviders/package.json b/packages/subproviders/package.json
index 0c791b80f..5e9c2ed89 100644
--- a/packages/subproviders/package.json
+++ b/packages/subproviders/package.json
@@ -19,6 +19,7 @@
     },
     "dependencies": {
         "@0xproject/assert": "^0.0.20",
+        "@0xproject/types": "^0.2.3",
         "@0xproject/utils": "^0.3.4",
         "bn.js": "^4.11.8",
         "es6-promisify": "^5.0.0",
@@ -33,7 +34,6 @@
     },
     "devDependencies": {
         "@0xproject/tslint-config": "^0.4.9",
-        "@0xproject/types": "^0.2.3",
         "@0xproject/utils": "^0.3.4",
         "@types/lodash": "^4.14.86",
         "@types/mocha": "^2.2.42",
diff --git a/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts b/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts
index 9aa47463c..56b0a9e45 100644
--- a/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts
+++ b/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts
@@ -9,11 +9,21 @@ import { utils } from './utils';
 
 const DISPENSE_AMOUNT_ETHER = 0.1;
 const DISPENSE_AMOUNT_TOKEN = 0.1;
+const DISPENSE_MAX_AMOUNT_TOKEN = 2;
+const DISPENSE_MAX_AMOUNT_ETHER = 2;
 
 export const dispenseAssetTasks = {
     dispenseEtherTask(recipientAddress: string, web3: Web3) {
         return async () => {
             utils.consoleLog(`Processing ETH ${recipientAddress}`);
+            const userBalance = await promisify<BigNumber>(web3.eth.getBalance)(recipientAddress);
+            const maxAmountInWei = new BigNumber(web3.toWei(DISPENSE_MAX_AMOUNT_ETHER, 'ether'));
+            if (userBalance.greaterThanOrEqualTo(maxAmountInWei)) {
+                utils.consoleLog(
+                    `User exceeded ETH balance maximum (${maxAmountInWei}) ${recipientAddress} ${userBalance} `,
+                );
+                return;
+            }
             const sendTransactionAsync = promisify(web3.eth.sendTransaction);
             const txHash = await sendTransactionAsync({
                 from: configs.DISPENSER_ADDRESS,
@@ -32,6 +42,17 @@ export const dispenseAssetTasks = {
                 throw new Error(`Unsupported asset type: ${tokenSymbol}`);
             }
             const baseUnitAmount = ZeroEx.toBaseUnitAmount(amountToDispense, token.decimals);
+            const userBalanceBaseUnits = await zeroEx.token.getBalanceAsync(token.address, recipientAddress);
+            const maxAmountBaseUnits = ZeroEx.toBaseUnitAmount(
+                new BigNumber(DISPENSE_MAX_AMOUNT_TOKEN),
+                token.decimals,
+            );
+            if (userBalanceBaseUnits.greaterThanOrEqualTo(maxAmountBaseUnits)) {
+                utils.consoleLog(
+                    `User exceeded token balance maximum (${maxAmountBaseUnits}) ${recipientAddress} ${userBalanceBaseUnits} `,
+                );
+                return;
+            }
             const txHash = await zeroEx.token.transferAsync(
                 token.address,
                 configs.DISPENSER_ADDRESS,
diff --git a/packages/types/CHANGELOG.md b/packages/types/CHANGELOG.md
index b1cb721d2..a4f293d60 100644
--- a/packages/types/CHANGELOG.md
+++ b/packages/types/CHANGELOG.md
@@ -1,5 +1,10 @@
 # CHANGELOG
 
+## v0.2.4 - _TBD, 2018_
+
+    * Add `data` to `TxData` (#413)
+    * Add `number` as an option to `ContractEventArg` (#413)
+
 ## v0.2.1 - _February 9, 2018_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index cb17936f7..6242d4268 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -2,6 +2,7 @@ import { BigNumber } from 'bignumber.js';
 import * as Web3 from 'web3';
 
 export interface TxData {
+    data?: string;
     from?: string;
     gas?: number;
     gasPrice?: BigNumber;
@@ -38,7 +39,7 @@ export enum AbiType {
     Fallback = 'fallback',
 }
 
-export type ContractEventArg = string | BigNumber;
+export type ContractEventArg = string | BigNumber | number;
 
 export interface DecodedLogArgs {
     [argName: string]: ContractEventArg;
diff --git a/packages/utils/CHANGELOG.md b/packages/utils/CHANGELOG.md
index 19ee80e4f..81792bee8 100644
--- a/packages/utils/CHANGELOG.md
+++ b/packages/utils/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## v0.4.0 - _TBD, 2018_
+
+    * Use `ethers-contracts` as a backend to decode event args (#413)
+
 ## v0.3.2 - _February 9, 2018_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/utils/package.json b/packages/utils/package.json
index 750ecaa2f..4f63aa4ce 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -21,16 +21,18 @@
     "homepage": "https://github.com/0xProject/0x.js/packages/utils/README.md",
     "devDependencies": {
         "@0xproject/tslint-config": "^0.4.9",
-        "@0xproject/types": "^0.2.3",
         "@types/lodash": "^4.14.86",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
         "tslint": "5.8.0",
         "typescript": "2.7.1",
+        "ethers-typescript-typings": "^0.0.1",
         "web3-typescript-typings": "^0.9.11"
     },
     "dependencies": {
+        "@0xproject/types": "^0.2.3",
         "bignumber.js": "~4.1.0",
+        "ethers-contracts": "^2.2.1",
         "js-sha3": "^0.7.0",
         "lodash": "^4.17.4",
         "web3": "^0.20.0"
diff --git a/packages/utils/src/abi_decoder.ts b/packages/utils/src/abi_decoder.ts
index 368973b1b..2b496eb17 100644
--- a/packages/utils/src/abi_decoder.ts
+++ b/packages/utils/src/abi_decoder.ts
@@ -1,7 +1,7 @@
 import { AbiType, DecodedLogArgs, LogWithDecodedArgs, RawLog, SolidityTypes } from '@0xproject/types';
+import * as ethersContracts from 'ethers-contracts';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
-import * as SolidityCoder from 'web3/lib/solidity/coder';
 
 import { BigNumber } from './configured_bignumber';
 
@@ -27,31 +27,29 @@ export class AbiDecoder {
         if (_.isUndefined(event)) {
             return log;
         }
+        const ethersInterface = new ethersContracts.Interface([event]);
         const logData = log.data;
         const decodedParams: DecodedLogArgs = {};
-        let dataIndex = 0;
         let topicsIndex = 1;
 
         const nonIndexedInputs = _.filter(event.inputs, input => !input.indexed);
         const dataTypes = _.map(nonIndexedInputs, input => input.type);
-        const decodedData = SolidityCoder.decodeParams(dataTypes, logData.slice('0x'.length));
+        const decodedData = ethersInterface.events[event.name].parse(log.data);
 
         let failedToDecode = false;
-        _.forEach(event.inputs, (param: Web3.EventParameter) => {
+        _.forEach(event.inputs, (param: Web3.EventParameter, i: number) => {
             // Indexed parameters are stored in topics. Non-indexed ones in decodedData
-            let value: BigNumber | string = param.indexed ? log.topics[topicsIndex++] : decodedData[dataIndex++];
+            let value: BigNumber | string | number = param.indexed ? log.topics[topicsIndex++] : decodedData[i];
             if (_.isUndefined(value)) {
                 failedToDecode = true;
                 return;
             }
             if (param.type === SolidityTypes.Address) {
                 value = AbiDecoder._padZeros(new BigNumber(value).toString(16));
-            } else if (
-                param.type === SolidityTypes.Uint256 ||
-                param.type === SolidityTypes.Uint8 ||
-                param.type === SolidityTypes.Uint
-            ) {
+            } else if (param.type === SolidityTypes.Uint256 || param.type === SolidityTypes.Uint) {
                 value = new BigNumber(value);
+            } else if (param.type === SolidityTypes.Uint8) {
+                value = new BigNumber(value).toNumber();
             }
             decodedParams[param.name] = value;
         });
@@ -67,11 +65,14 @@ export class AbiDecoder {
         }
     }
     private _addABI(abiArray: Web3.AbiDefinition[]): void {
+        if (_.isUndefined(abiArray)) {
+            return;
+        }
+        const ethersInterface = new ethersContracts.Interface(abiArray);
         _.map(abiArray, (abi: Web3.AbiDefinition) => {
             if (abi.type === AbiType.Event) {
-                const signature = `${abi.name}(${_.map(abi.inputs, input => input.type).join(',')})`;
-                const signatureHash = new Web3().sha3(signature);
-                this._methodIds[signatureHash] = abi;
+                const topic = ethersInterface.events[abi.name].topic;
+                this._methodIds[topic] = abi;
             }
         });
         this._savedABIs = this._savedABIs.concat(abiArray);
diff --git a/packages/utils/src/globals.d.ts b/packages/utils/src/globals.d.ts
deleted file mode 100644
index ade9e59db..000000000
--- a/packages/utils/src/globals.d.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-declare module 'web3/lib/solidity/coder' {
-    const decodeParams: (types: string[], data: string) => any[];
-}
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
index 3d967d05f..8114d99cd 100644
--- a/packages/utils/tsconfig.json
+++ b/packages/utils/tsconfig.json
@@ -3,5 +3,9 @@
     "compilerOptions": {
         "outDir": "lib"
     },
-    "include": ["./src/**/*", "../../node_modules/web3-typescript-typings/index.d.ts"]
+    "include": [
+        "./src/**/*",
+        "../../node_modules/web3-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts"
+    ]
 }
diff --git a/packages/web3-wrapper/CHANGELOG.md b/packages/web3-wrapper/CHANGELOG.md
index eb31f7e3c..eef665d24 100644
--- a/packages/web3-wrapper/CHANGELOG.md
+++ b/packages/web3-wrapper/CHANGELOG.md
@@ -1,5 +1,12 @@
 # CHANGELOG
 
+## v0.2.0 _TBD, 2018_
+
+    * Ensure all returned user addresses are lowercase (#373)
+    * Add `web3Wrapper.callAsync` (#413)
+    * Make `web3Wrapper.estimateGas` accept whole `txData` instead of `data` (#413)
+    * Remove `web3Wrapper.getContractInstance` (#413)
+
 ## v0.1.12 _February 9, 2018_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/web3-wrapper/package.json b/packages/web3-wrapper/package.json
index 8e861b1d5..55f1ffff0 100644
--- a/packages/web3-wrapper/package.json
+++ b/packages/web3-wrapper/package.json
@@ -21,7 +21,6 @@
     "homepage": "https://github.com/0xProject/0x.js/packages/web3-wrapper/README.md",
     "devDependencies": {
         "@0xproject/tslint-config": "^0.4.9",
-        "@0xproject/types": "^0.2.3",
         "@types/lodash": "^4.14.86",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -30,7 +29,10 @@
         "web3-typescript-typings": "^0.9.11"
     },
     "dependencies": {
+        "@0xproject/types": "^0.2.3",
         "@0xproject/utils": "^0.3.4",
+        "ethers-contracts": "^2.2.1",
+        "ethers-typescript-typings": "^0.0.1",
         "lodash": "^4.17.4",
         "web3": "^0.20.0"
     }
diff --git a/packages/web3-wrapper/src/index.ts b/packages/web3-wrapper/src/index.ts
index a2878fc2a..a07805344 100644
--- a/packages/web3-wrapper/src/index.ts
+++ b/packages/web3-wrapper/src/index.ts
@@ -41,7 +41,8 @@ export class Web3Wrapper {
     }
     public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
         const addresses = await this.getAvailableAddressesAsync();
-        return _.includes(addresses, senderAddress);
+        const normalizedAddress = senderAddress.toLowerCase();
+        return _.includes(addresses, normalizedAddress);
     }
     public async getNodeVersionAsync(): Promise<string> {
         const nodeVersion = await promisify<string>(this._web3.version.getNode)();
@@ -96,7 +97,8 @@ export class Web3Wrapper {
     }
     public async getAvailableAddressesAsync(): Promise<string[]> {
         const addresses = await promisify<string[]>(this._web3.eth.getAccounts)();
-        return addresses;
+        const normalizedAddresses = _.map(addresses, address => address.toLowerCase());
+        return normalizedAddresses;
     }
     public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
         let fromBlock = filter.fromBlock;
@@ -126,14 +128,14 @@ export class Web3Wrapper {
         const web3Contract = this._web3.eth.contract(abi);
         return web3Contract;
     }
-    public getContractInstance(abi: Web3.ContractAbi, address: string): Web3.ContractInstance {
-        const web3ContractInstance = this.getContractFromAbi(abi).at(address);
-        return web3ContractInstance;
-    }
-    public async estimateGasAsync(data: string): Promise<number> {
-        const gas = await promisify<number>(this._web3.eth.estimateGas)({ data });
+    public async estimateGasAsync(txData: Partial<Web3.TxData>): Promise<number> {
+        const gas = await promisify<number>(this._web3.eth.estimateGas)(txData);
         return gas;
     }
+    public async callAsync(callData: Web3.CallData, defaultBlock?: Web3.BlockParam): Promise<string> {
+        const rawCalllResult = await promisify<string>(this._web3.eth.call)(callData, defaultBlock);
+        return rawCalllResult;
+    }
     public async sendTransactionAsync(txData: Web3.TxData): Promise<string> {
         const txHash = await promisify<string>(this._web3.eth.sendTransaction)(txData);
         return txHash;
diff --git a/packages/web3-wrapper/tsconfig.json b/packages/web3-wrapper/tsconfig.json
index 3d967d05f..7bae7f9f0 100644
--- a/packages/web3-wrapper/tsconfig.json
+++ b/packages/web3-wrapper/tsconfig.json
@@ -3,5 +3,9 @@
     "compilerOptions": {
         "outDir": "lib"
     },
-    "include": ["./src/**/*", "../../node_modules/web3-typescript-typings/index.d.ts"]
+    "include": [
+        "./src/**/*",
+        "../../node_modules/ethers-typescript-typings/index.d.ts",
+        "../../node_modules/web3-typescript-typings/index.d.ts"
+    ]
 }
diff --git a/packages/website/README.md b/packages/website/README.md
index 7d3187781..042df52de 100644
--- a/packages/website/README.md
+++ b/packages/website/README.md
@@ -58,11 +58,11 @@ yarn lint
 
 ##### Toolkit
 
-* [Material Design Icon Font](http://zavoloklom.github.io/material-design-iconic-font/icons.html#directional)
-* [BassCSS toolkit](http://basscss.com/)
-* [Material-UI component library](http://www.material-ui.com/#/)
+*   [Material Design Icon Font](http://zavoloklom.github.io/material-design-iconic-font/icons.html#directional)
+*   [BassCSS toolkit](http://basscss.com/)
+*   [Material-UI component library](http://www.material-ui.com/#/)
 
 ##### Recommended Atom packages:
 
-* [atom-typescript](https://atom.io/packages/atom-typescript)
-* [linter-tslint](https://atom.io/packages/linter-tslint)
+*   [atom-typescript](https://atom.io/packages/atom-typescript)
+*   [linter-tslint](https://atom.io/packages/linter-tslint)
diff --git a/packages/website/md/docs/smart_contracts/introduction.md b/packages/website/md/docs/smart_contracts/introduction.md
index 20396289b..566a573b6 100644
--- a/packages/website/md/docs/smart_contracts/introduction.md
+++ b/packages/website/md/docs/smart_contracts/introduction.md
@@ -2,7 +2,7 @@ Welcome to the [0x smart contracts](https://github.com/0xProject/contracts) docu
 
 ### Helpful wiki articles:
 
-* [Overview of 0x protocol architecture](https://0xproject.com/wiki#Architecture)
-* [0x smart contract interactions](https://0xproject.com/wiki#Contract-Interactions)
-* [Deployed smart contract addresses](https://0xproject.com/wiki#Deployed-Addresses)
-* [0x protocol message format](https://0xproject.com/wiki#Message-Format)
+*   [Overview of 0x protocol architecture](https://0xproject.com/wiki#Architecture)
+*   [0x smart contract interactions](https://0xproject.com/wiki#Contract-Interactions)
+*   [Deployed smart contract addresses](https://0xproject.com/wiki#Deployed-Addresses)
+*   [0x protocol message format](https://0xproject.com/wiki#Message-Format)
diff --git a/packages/website/package.json b/packages/website/package.json
index 1d313390a..ceb3853f9 100644
--- a/packages/website/package.json
+++ b/packages/website/package.json
@@ -87,6 +87,7 @@
         "copy-webpack-plugin": "^4.0.1",
         "copyfiles": "^1.2.0",
         "css-loader": "0.23.x",
+        "ethers-typescript-typings": "^0.0.1",
         "exports-loader": "0.6.x",
         "imports-loader": "0.6.x",
         "json-loader": "^0.5.4",
diff --git a/packages/website/public/index.html b/packages/website/public/index.html
index 75ca9a4ed..c28e4abf4 100644
--- a/packages/website/public/index.html
+++ b/packages/website/public/index.html
@@ -23,6 +23,18 @@
 </head>
 
 <body style="margin: 0px; min-width: 355px;">
+    <!-- Global site tag (gtag.js) - Google Analytics -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-98720122-1"></script>
+    <script>
+    window.dataLayer = window.dataLayer || [];
+function gtag() {
+    dataLayer.push(arguments);
+}
+gtag('js', new Date());
+
+gtag('config', 'UA-98720122-1');
+</script>
+    <!-- End Google Analytics -->
     <!-- Facebook SDK -->
     <div id="fb-root"></div>
     <script>
diff --git a/packages/website/translations/english.json b/packages/website/translations/english.json
index 8aebe1848..9a1c9b2c8 100644
--- a/packages/website/translations/english.json
+++ b/packages/website/translations/english.json
@@ -67,7 +67,7 @@
     "STANDARD_RELAYER_API": "standard relayer API",
     "PORTAL_DAPP": "portal dApp",
     "WEBSITE": "website",
-    "DEVELOPERS": "home",
-    "HOME": "rocket.chat",
-    "ROCKETCHAT": "developers"
+    "DEVELOPERS": "developers",
+    "HOME": "home",
+    "ROCKETCHAT": "rocket.chat"
 }
diff --git a/packages/website/translations/russian.json b/packages/website/translations/russian.json
index a4e47264b..c103960c0 100644
--- a/packages/website/translations/russian.json
+++ b/packages/website/translations/russian.json
@@ -3,7 +3,7 @@
     "TOP_TAGLINE": "0x — это протокол с открытым кодом, позволяющий торговать токенами ERC20, на блокчейне Ethereum.",
     "BUILD_CALL_TO_ACTION": "Разрабатывайте на 0x",
     "COMMUNITY_CALL_TO_ACTION": "Сообщество",
-    "PROJECTS_HEADER": "Прожкты разработанные на 0х",
+    "PROJECTS_HEADER": "Проекты разработанные на 0х",
     "FULL_LIST_PROMPT": "Просмотреть",
     "FULL_LIST_LINK": "полный список",
     "TOKENIZED_SECTION_HEADER": "Сегодняшний мир движется к токенизации ценности",
diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index db3872a32..85b4e892f 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -672,7 +672,7 @@ export class Blockchain {
         }
     }
     private _stopWatchingExchangeLogFillEvents(): void {
-        this._zeroEx.exchange._unsubscribeAll();
+        this._zeroEx.exchange.unsubscribeAll();
     }
     private async _getTokenRegistryTokensByAddressAsync(): Promise<TokenByAddress> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
diff --git a/packages/website/ts/components/footer.tsx b/packages/website/ts/components/footer.tsx
index aa597be1c..810460cac 100644
--- a/packages/website/ts/components/footer.tsx
+++ b/packages/website/ts/components/footer.tsx
@@ -201,11 +201,9 @@ export class Footer extends React.Component<FooterProps, FooterState> {
                 {item.isExternal ? (
                     <a className="text-decoration-none" style={linkStyle} target="_blank" href={item.path}>
                         {!_.isUndefined(iconIfExists) ? (
-                            <div className="sm-mx-auto" style={{ minWidth: 65 }}>
-                                <div className="flex">
-                                    <div className="pr1">{this._renderIcon(iconIfExists)}</div>
-                                    <div>{item.title}</div>
-                                </div>
+                            <div className="inline-block">
+                                <div className="pr1 table-cell">{this._renderIcon(iconIfExists)}</div>
+                                <div className="table-cell">{item.title}</div>
                             </div>
                         ) : (
                             item.title
diff --git a/packages/website/ts/components/top_bar/top_bar.tsx b/packages/website/ts/components/top_bar/top_bar.tsx
index 2723c2218..b2b2d2ebd 100644
--- a/packages/website/ts/components/top_bar/top_bar.tsx
+++ b/packages/website/ts/components/top_bar/top_bar.tsx
@@ -319,7 +319,6 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
                     shouldDisplaySectionHeaders={false}
                     onMenuItemClick={this._onMenuButtonClick.bind(this)}
                     selectedVersion={this.props.docsVersion}
-                    docPath={this.props.docsInfo.websitePath}
                     versions={this.props.availableDocVersions}
                 />
             </div>
diff --git a/packages/website/ts/containers/connect_documentation.tsx b/packages/website/ts/containers/connect_documentation.tsx
index 5c5d26b44..464bdcd74 100644
--- a/packages/website/ts/containers/connect_documentation.tsx
+++ b/packages/website/ts/containers/connect_documentation.tsx
@@ -2,15 +2,14 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import { connect } from 'react-redux';
 import { Dispatch } from 'redux';
+import { DocPage as DocPageComponent, DocPageProps } from 'ts/pages/documentation/doc_page';
 import { DocsInfo } from 'ts/pages/documentation/docs_info';
-import { Documentation as DocumentationComponent, DocumentationAllProps } from 'ts/pages/documentation/documentation';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { State } from 'ts/redux/reducer';
-import { DocsInfoConfig, Environments, WebsitePaths } from 'ts/types';
+import { DocPackages, DocsInfoConfig, Environments, SupportedDocJson, WebsitePaths } from 'ts/types';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
 import { Translate } from 'ts/utils/translate';
-import { typeDocUtils } from 'ts/utils/typedoc_utils';
 
 /* tslint:disable:no-var-requires */
 const IntroMarkdown = require('md/docs/connect/introduction');
@@ -25,16 +24,11 @@ const connectDocSections = {
     types: constants.TYPES_SECTION_NAME,
 };
 
-const s3BucketName =
-    configs.ENVIRONMENT === Environments.DEVELOPMENT ? 'staging-connect-docs-jsons' : 'connect-docs-jsons';
-const docsJsonRoot = `https://s3.amazonaws.com/${s3BucketName}`;
-
 const docsInfoConfig: DocsInfoConfig = {
+    id: DocPackages.Connect,
+    type: SupportedDocJson.TypeDoc,
     displayName: '0x Connect',
-    subPackageName: 'connect',
     packageUrl: 'https://github.com/0xProject/0x.js',
-    websitePath: WebsitePaths.Connect,
-    docsJsonRoot,
     menu: {
         introduction: [connectDocSections.introduction],
         install: [connectDocSections.installation],
@@ -77,7 +71,6 @@ const docsInfoConfig: DocsInfoConfig = {
     menuSubsectionToVersionWhenIntroduced: {},
     sections: connectDocSections,
     visibleConstructors: [connectDocSections.httpClient, connectDocSections.webSocketOrderbookChannel],
-    convertToDocAgnosticFormatFn: typeDocUtils.convertToDocAgnosticFormat.bind(typeDocUtils),
 };
 const docsInfo = new DocsInfo(docsInfoConfig);
 
@@ -92,7 +85,7 @@ interface ConnectedDispatch {
     dispatcher: Dispatcher;
 }
 
-const mapStateToProps = (state: State, ownProps: DocumentationAllProps): ConnectedState => ({
+const mapStateToProps = (state: State, ownProps: DocPageProps): ConnectedState => ({
     docsVersion: state.docsVersion,
     availableDocVersions: state.availableDocVersions,
     translate: state.translate,
@@ -103,6 +96,6 @@ const mapDispatchToProps = (dispatch: Dispatch<State>): ConnectedDispatch => ({
     dispatcher: new Dispatcher(dispatch),
 });
 
-export const Documentation: React.ComponentClass<DocumentationAllProps> = connect(mapStateToProps, mapDispatchToProps)(
-    DocumentationComponent,
+export const Documentation: React.ComponentClass<DocPageProps> = connect(mapStateToProps, mapDispatchToProps)(
+    DocPageComponent,
 );
diff --git a/packages/website/ts/containers/smart_contracts_documentation.tsx b/packages/website/ts/containers/smart_contracts_documentation.tsx
index c4731f929..a839529aa 100644
--- a/packages/website/ts/containers/smart_contracts_documentation.tsx
+++ b/packages/website/ts/containers/smart_contracts_documentation.tsx
@@ -2,12 +2,18 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import { connect } from 'react-redux';
 import { Dispatch } from 'redux';
+import { DocPage as DocPageComponent, DocPageProps } from 'ts/pages/documentation/doc_page';
 import { DocsInfo } from 'ts/pages/documentation/docs_info';
-import { Documentation as DocumentationComponent, DocumentationAllProps } from 'ts/pages/documentation/documentation';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { State } from 'ts/redux/reducer';
-import { DocsInfoConfig, SmartContractDocSections as Sections, WebsitePaths } from 'ts/types';
-import { doxityUtils } from 'ts/utils/doxity_utils';
+import {
+    DocPackages,
+    DocsInfoConfig,
+    Networks,
+    SmartContractDocSections as Sections,
+    SupportedDocJson,
+    WebsitePaths,
+} from 'ts/types';
 import { Translate } from 'ts/utils/translate';
 
 /* tslint:disable:no-var-requires */
@@ -15,10 +21,10 @@ const IntroMarkdown = require('md/docs/smart_contracts/introduction');
 /* tslint:enable:no-var-requires */
 
 const docsInfoConfig: DocsInfoConfig = {
+    id: DocPackages.SmartContracts,
+    type: SupportedDocJson.Doxity,
     displayName: '0x Smart Contracts',
     packageUrl: 'https://github.com/0xProject/contracts',
-    websitePath: WebsitePaths.SmartContracts,
-    docsJsonRoot: 'https://s3.amazonaws.com/smart-contracts-docs-json',
     menu: {
         introduction: [Sections.Introduction],
         contracts: [Sections.Exchange, Sections.TokenRegistry, Sections.ZRXToken, Sections.TokenTransferProxy],
@@ -34,7 +40,34 @@ const docsInfoConfig: DocsInfoConfig = {
         ZRXToken: Sections.ZRXToken,
     },
     visibleConstructors: [Sections.Exchange, Sections.TokenRegistry, Sections.ZRXToken, Sections.TokenTransferProxy],
-    convertToDocAgnosticFormatFn: doxityUtils.convertToDocAgnosticFormat.bind(doxityUtils),
+    contractsByVersionByNetworkId: {
+        '1.0.0': {
+            [Networks.Mainnet]: {
+                [Sections.Exchange]: '0x12459c951127e0c374ff9105dda097662a027093',
+                [Sections.TokenTransferProxy]: '0x8da0d80f5007ef1e431dd2127178d224e32c2ef4',
+                [Sections.ZRXToken]: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+                [Sections.TokenRegistry]: '0x926a74c5c36adf004c87399e65f75628b0f98d2c',
+            },
+            [Networks.Ropsten]: {
+                [Sections.Exchange]: '0x479cc461fecd078f766ecc58533d6f69580cf3ac',
+                [Sections.TokenTransferProxy]: '0x4e9aad8184de8833365fea970cd9149372fdf1e6',
+                [Sections.ZRXToken]: '0xa8e9fa8f91e5ae138c74648c9c304f1c75003a8d',
+                [Sections.TokenRegistry]: '0x6b1a50f0bb5a7995444bd3877b22dc89c62843ed',
+            },
+            [Networks.Kovan]: {
+                [Sections.Exchange]: '0x90fe2af704b34e0224bf2299c838e04d4dcf1364',
+                [Sections.TokenTransferProxy]: '0x087Eed4Bc1ee3DE49BeFbd66C662B434B15d49d4',
+                [Sections.ZRXToken]: '0x6ff6c0ff1d68b964901f986d4c9fa3ac68346570',
+                [Sections.TokenRegistry]: '0xf18e504561f4347bea557f3d4558f559dddbae7f',
+            },
+            [Networks.Rinkeby]: {
+                [Sections.Exchange]: '0x1d16ef40fac01cec8adac2ac49427b9384192c05',
+                [Sections.TokenTransferProxy]: '0xa8e9fa8f91e5ae138c74648c9c304f1c75003a8d',
+                [Sections.ZRXToken]: '0x00f58d6d585f84b2d7267940cede30ce2fe6eae8',
+                [Sections.TokenRegistry]: '0x4e9aad8184de8833365fea970cd9149372fdf1e6',
+            },
+        },
+    },
 };
 const docsInfo = new DocsInfo(docsInfoConfig);
 
@@ -49,7 +82,7 @@ interface ConnectedDispatch {
     docsInfo: DocsInfo;
 }
 
-const mapStateToProps = (state: State, ownProps: DocumentationAllProps): ConnectedState => ({
+const mapStateToProps = (state: State, ownProps: DocPageProps): ConnectedState => ({
     docsVersion: state.docsVersion,
     availableDocVersions: state.availableDocVersions,
     translate: state.translate,
@@ -60,6 +93,6 @@ const mapDispatchToProps = (dispatch: Dispatch<State>): ConnectedDispatch => ({
     docsInfo,
 });
 
-export const Documentation: React.ComponentClass<DocumentationAllProps> = connect(mapStateToProps, mapDispatchToProps)(
-    DocumentationComponent,
+export const Documentation: React.ComponentClass<DocPageProps> = connect(mapStateToProps, mapDispatchToProps)(
+    DocPageComponent,
 );
diff --git a/packages/website/ts/containers/zero_ex_js_documentation.tsx b/packages/website/ts/containers/zero_ex_js_documentation.tsx
index a32a87f7f..500bf8d96 100644
--- a/packages/website/ts/containers/zero_ex_js_documentation.tsx
+++ b/packages/website/ts/containers/zero_ex_js_documentation.tsx
@@ -2,15 +2,14 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import { connect } from 'react-redux';
 import { Dispatch } from 'redux';
+import { DocPage as DocPageComponent, DocPageProps } from 'ts/pages/documentation/doc_page';
 import { DocsInfo } from 'ts/pages/documentation/docs_info';
-import { Documentation as DocumentationComponent, DocumentationAllProps } from 'ts/pages/documentation/documentation';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { State } from 'ts/redux/reducer';
-import { DocsInfoConfig, Environments, WebsitePaths } from 'ts/types';
+import { DocPackages, DocsInfoConfig, Environments, SupportedDocJson, WebsitePaths } from 'ts/types';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
 import { Translate } from 'ts/utils/translate';
-import { typeDocUtils } from 'ts/utils/typedoc_utils';
 
 /* tslint:disable:no-var-requires */
 const IntroMarkdown = require('md/docs/0xjs/introduction');
@@ -37,15 +36,11 @@ const zeroExJsDocSections = {
     types: constants.TYPES_SECTION_NAME,
 };
 
-const s3BucketName = configs.ENVIRONMENT === Environments.DEVELOPMENT ? 'staging-0xjs-docs-jsons' : '0xjs-docs-jsons';
-const docsJsonRoot = `https://s3.amazonaws.com/${s3BucketName}`;
-
 const docsInfoConfig: DocsInfoConfig = {
+    id: DocPackages.ZeroExJs,
+    type: SupportedDocJson.TypeDoc,
     displayName: '0x.js',
     packageUrl: 'https://github.com/0xProject/0x.js',
-    subPackageName: '0x.js',
-    websitePath: WebsitePaths.ZeroExJs,
-    docsJsonRoot,
     menu: {
         introduction: [zeroExJsDocSections.introduction],
         install: [zeroExJsDocSections.installation],
@@ -69,7 +64,8 @@ const docsInfoConfig: DocsInfoConfig = {
         [zeroExJsDocSections.versioning]: versioningMarkdown,
     },
     // Note: This needs to be kept in sync with the types exported in index.ts. Unfortunately there is
-    // currently no way to extract the re-exported types from index.ts via TypeDoc :(
+    // currently no way to extract the re-exported types from index.ts via TypeDoc :( Make sure to only
+    // ADD types here, DO NOT REMOVE types since they might still be needed for older supported versions
     publicTypes: [
         'Order',
         'SignedOrder',
@@ -147,7 +143,6 @@ const docsInfoConfig: DocsInfoConfig = {
     },
     sections: zeroExJsDocSections,
     visibleConstructors: [zeroExJsDocSections.zeroEx],
-    convertToDocAgnosticFormatFn: typeDocUtils.convertToDocAgnosticFormat.bind(typeDocUtils),
 };
 const docsInfo = new DocsInfo(docsInfoConfig);
 
@@ -162,7 +157,7 @@ interface ConnectedDispatch {
     dispatcher: Dispatcher;
 }
 
-const mapStateToProps = (state: State, ownProps: DocumentationAllProps): ConnectedState => ({
+const mapStateToProps = (state: State, ownProps: DocPageProps): ConnectedState => ({
     docsVersion: state.docsVersion,
     availableDocVersions: state.availableDocVersions,
     docsInfo,
@@ -173,6 +168,6 @@ const mapDispatchToProps = (dispatch: Dispatch<State>): ConnectedDispatch => ({
     dispatcher: new Dispatcher(dispatch),
 });
 
-export const Documentation: React.ComponentClass<DocumentationAllProps> = connect(mapStateToProps, mapDispatchToProps)(
-    DocumentationComponent,
+export const Documentation: React.ComponentClass<DocPageProps> = connect(mapStateToProps, mapDispatchToProps)(
+    DocPageComponent,
 );
diff --git a/packages/website/ts/pages/documentation/doc_page.tsx b/packages/website/ts/pages/documentation/doc_page.tsx
new file mode 100644
index 000000000..2c8f1c103
--- /dev/null
+++ b/packages/website/ts/pages/documentation/doc_page.tsx
@@ -0,0 +1,132 @@
+import findVersions = require('find-versions');
+import * as _ from 'lodash';
+import * as React from 'react';
+import DocumentTitle = require('react-document-title');
+import semverSort = require('semver-sort');
+import { TopBar } from 'ts/components/top_bar/top_bar';
+import { DocsInfo } from 'ts/pages/documentation/docs_info';
+import { Documentation } from 'ts/pages/documentation/documentation';
+import { Dispatcher } from 'ts/redux/dispatcher';
+import { DocAgnosticFormat, DocPackages, DoxityDocObj, Environments, MenuSubsectionsBySection } from 'ts/types';
+import { configs } from 'ts/utils/configs';
+import { constants } from 'ts/utils/constants';
+import { docUtils } from 'ts/utils/doc_utils';
+import { Translate } from 'ts/utils/translate';
+
+const docIdToS3BucketName: { [id: string]: string } = {
+    [DocPackages.ZeroExJs]: '0xjs-docs-jsons',
+    [DocPackages.SmartContracts]: 'smart-contracts-docs-json',
+    [DocPackages.Connect]:
+        configs.ENVIRONMENT === Environments.DEVELOPMENT ? 'staging-connect-docs-jsons' : 'connect-docs-jsons',
+};
+
+const docIdToSubpackageName: { [id: string]: string } = {
+    [DocPackages.ZeroExJs]: '0x.js',
+    [DocPackages.Connect]: 'connect',
+    [DocPackages.SmartContracts]: 'contracts',
+};
+
+export interface DocPageProps {
+    location: Location;
+    dispatcher: Dispatcher;
+    docsVersion: string;
+    availableDocVersions: string[];
+    docsInfo: DocsInfo;
+    translate: Translate;
+}
+
+interface DocPageState {
+    docAgnosticFormat?: DocAgnosticFormat;
+}
+
+export class DocPage extends React.Component<DocPageProps, DocPageState> {
+    private _isUnmounted: boolean;
+    constructor(props: DocPageProps) {
+        super(props);
+        this._isUnmounted = false;
+        this.state = {
+            docAgnosticFormat: undefined,
+        };
+    }
+    public componentWillMount() {
+        const pathName = this.props.location.pathname;
+        const lastSegment = pathName.substr(pathName.lastIndexOf('/') + 1);
+        const versions = findVersions(lastSegment);
+        const preferredVersionIfExists = versions.length > 0 ? versions[0] : undefined;
+        // tslint:disable-next-line:no-floating-promises
+        this._fetchJSONDocsFireAndForgetAsync(preferredVersionIfExists);
+    }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
+    }
+
+    public render() {
+        const menuSubsectionsBySection = _.isUndefined(this.state.docAgnosticFormat)
+            ? {}
+            : this.props.docsInfo.getMenuSubsectionsBySection(this.state.docAgnosticFormat);
+        const sourceUrl = this._getSourceUrl();
+        return (
+            <div>
+                <DocumentTitle title={`${this.props.docsInfo.displayName} Documentation`} />
+                <TopBar
+                    blockchainIsLoaded={false}
+                    location={this.props.location}
+                    docsVersion={this.props.docsVersion}
+                    availableDocVersions={this.props.availableDocVersions}
+                    menu={this.props.docsInfo.getMenu(this.props.docsVersion)}
+                    menuSubsectionsBySection={menuSubsectionsBySection}
+                    docsInfo={this.props.docsInfo}
+                    translate={this.props.translate}
+                />
+                <Documentation
+                    location={this.props.location}
+                    docsVersion={this.props.docsVersion}
+                    availableDocVersions={this.props.availableDocVersions}
+                    docsInfo={this.props.docsInfo}
+                    docAgnosticFormat={this.state.docAgnosticFormat}
+                    menuSubsectionsBySection={menuSubsectionsBySection}
+                    sourceUrl={sourceUrl}
+                />
+            </div>
+        );
+    }
+    private async _fetchJSONDocsFireAndForgetAsync(preferredVersionIfExists?: string): Promise<void> {
+        const s3BucketName = docIdToS3BucketName[this.props.docsInfo.id];
+        const docsJsonRoot = `${constants.S3_BUCKET_ROOT}/${s3BucketName}`;
+        const versionToFileName = await docUtils.getVersionToFileNameAsync(docsJsonRoot);
+        const versions = _.keys(versionToFileName);
+        this.props.dispatcher.updateAvailableDocVersions(versions);
+        const sortedVersions = semverSort.desc(versions);
+        const latestVersion = sortedVersions[0];
+
+        let versionToFetch = latestVersion;
+        if (!_.isUndefined(preferredVersionIfExists)) {
+            const preferredVersionFileNameIfExists = versionToFileName[preferredVersionIfExists];
+            if (!_.isUndefined(preferredVersionFileNameIfExists)) {
+                versionToFetch = preferredVersionIfExists;
+            }
+        }
+        this.props.dispatcher.updateCurrentDocsVersion(versionToFetch);
+
+        const versionFileNameToFetch = versionToFileName[versionToFetch];
+        const versionDocObj = await docUtils.getJSONDocFileAsync(versionFileNameToFetch, docsJsonRoot);
+        const docAgnosticFormat = this.props.docsInfo.convertToDocAgnosticFormat(versionDocObj as DoxityDocObj);
+
+        if (!this._isUnmounted) {
+            this.setState({
+                docAgnosticFormat,
+            });
+        }
+    }
+    private _getSourceUrl() {
+        const url = this.props.docsInfo.packageUrl;
+        const pkg = docIdToSubpackageName[this.props.docsInfo.id];
+        let tagPrefix = pkg;
+        const packagesWithNamespace = ['connect'];
+        if (_.includes(packagesWithNamespace, pkg)) {
+            tagPrefix = `@0xproject/${pkg}`;
+        }
+        const sourceUrl = `${url}/blob/${tagPrefix}%40${this.props.docsVersion}/packages/${pkg}`;
+        return sourceUrl;
+    }
+}
diff --git a/packages/website/ts/pages/documentation/docs_info.ts b/packages/website/ts/pages/documentation/docs_info.ts
index 4b1ec122a..31e151fe8 100644
--- a/packages/website/ts/pages/documentation/docs_info.ts
+++ b/packages/website/ts/pages/documentation/docs_info.ts
@@ -1,33 +1,37 @@
 import compareVersions = require('compare-versions');
 import * as _ from 'lodash';
 import {
+    ContractsByVersionByNetworkId,
     DocAgnosticFormat,
     DocsInfoConfig,
     DocsMenu,
     DoxityDocObj,
     MenuSubsectionsBySection,
     SectionsMap,
+    SupportedDocJson,
     TypeDocNode,
 } from 'ts/types';
+import { doxityUtils } from 'ts/utils/doxity_utils';
+import { typeDocUtils } from 'ts/utils/typedoc_utils';
 
 export class DocsInfo {
+    public id: string;
+    public type: SupportedDocJson;
     public displayName: string;
     public packageUrl: string;
-    public subPackageName?: string;
-    public websitePath: string;
-    public docsJsonRoot: string;
     public menu: DocsMenu;
     public sections: SectionsMap;
     public sectionNameToMarkdown: { [sectionName: string]: string };
+    public contractsByVersionByNetworkId?: ContractsByVersionByNetworkId;
     private _docsInfo: DocsInfoConfig;
     constructor(config: DocsInfoConfig) {
+        this.id = config.id;
+        this.type = config.type;
         this.displayName = config.displayName;
         this.packageUrl = config.packageUrl;
-        this.subPackageName = config.subPackageName;
-        this.websitePath = config.websitePath;
-        this.docsJsonRoot = config.docsJsonRoot;
         this.sections = config.sections;
         this.sectionNameToMarkdown = config.sectionNameToMarkdown;
+        this.contractsByVersionByNetworkId = config.contractsByVersionByNetworkId;
         this._docsInfo = config;
     }
     public isPublicType(typeName: string): boolean {
@@ -106,6 +110,10 @@ export class DocsInfo {
         return _.includes(this._docsInfo.visibleConstructors, sectionName);
     }
     public convertToDocAgnosticFormat(docObj: DoxityDocObj | TypeDocNode): DocAgnosticFormat {
-        return this._docsInfo.convertToDocAgnosticFormatFn(docObj, this);
+        if (this.type === SupportedDocJson.Doxity) {
+            return doxityUtils.convertToDocAgnosticFormat(docObj as DoxityDocObj);
+        } else {
+            return typeDocUtils.convertToDocAgnosticFormat(docObj as TypeDocNode, this);
+        }
     }
 }
diff --git a/packages/website/ts/pages/documentation/documentation.tsx b/packages/website/ts/pages/documentation/documentation.tsx
index 285471166..7eed78fc3 100644
--- a/packages/website/ts/pages/documentation/documentation.tsx
+++ b/packages/website/ts/pages/documentation/documentation.tsx
@@ -1,11 +1,7 @@
-import findVersions = require('find-versions');
 import * as _ from 'lodash';
 import CircularProgress from 'material-ui/CircularProgress';
 import * as React from 'react';
-import DocumentTitle = require('react-document-title');
 import { scroller } from 'react-scroll';
-import semverSort = require('semver-sort');
-import { TopBar } from 'ts/components/top_bar/top_bar';
 import { Badge } from 'ts/components/ui/badge';
 import { Comment } from 'ts/pages/documentation/comment';
 import { DocsInfo } from 'ts/pages/documentation/docs_info';
@@ -17,25 +13,23 @@ import { TypeDefinition } from 'ts/pages/documentation/type_definition';
 import { MarkdownSection } from 'ts/pages/shared/markdown_section';
 import { NestedSidebarMenu } from 'ts/pages/shared/nested_sidebar_menu';
 import { SectionHeader } from 'ts/pages/shared/section_header';
-import { Dispatcher } from 'ts/redux/dispatcher';
 import {
     AddressByContractName,
     DocAgnosticFormat,
     DoxityDocObj,
     EtherscanLinkSuffixes,
     Event,
+    MenuSubsectionsBySection,
     Networks,
     Property,
     SolidityMethod,
     Styles,
+    SupportedDocJson,
     TypeDefinitionByName,
     TypescriptMethod,
 } from 'ts/types';
 import { colors } from 'ts/utils/colors';
-import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
-import { docUtils } from 'ts/utils/doc_utils';
-import { Translate } from 'ts/utils/translate';
 import { utils } from 'ts/utils/utils';
 
 const TOP_BAR_HEIGHT = 60;
@@ -48,20 +42,18 @@ const networkNameToColor: { [network: string]: string } = {
     [Networks.Rinkeby]: colors.darkYellow,
 };
 
-export interface DocumentationAllProps {
-    source: string;
+export interface DocumentationProps {
     location: Location;
-    dispatcher: Dispatcher;
     docsVersion: string;
     availableDocVersions: string[];
     docsInfo: DocsInfo;
-    translate: Translate;
-}
-
-interface DocumentationState {
     docAgnosticFormat?: DocAgnosticFormat;
+    menuSubsectionsBySection: MenuSubsectionsBySection;
+    sourceUrl: string;
 }
 
+interface DocumentationState {}
+
 const styles: Styles = {
     mainContainers: {
         position: 'absolute',
@@ -81,57 +73,17 @@ const styles: Styles = {
     },
 };
 
-export class Documentation extends React.Component<DocumentationAllProps, DocumentationState> {
-    private _isUnmounted: boolean;
-    constructor(props: DocumentationAllProps) {
-        super(props);
-        this._isUnmounted = false;
-        this.state = {
-            docAgnosticFormat: undefined,
-        };
-    }
-    public componentWillMount() {
-        const pathName = this.props.location.pathname;
-        const lastSegment = pathName.substr(pathName.lastIndexOf('/') + 1);
-        const versions = findVersions(lastSegment);
-        const preferredVersionIfExists = versions.length > 0 ? versions[0] : undefined;
-        // tslint:disable-next-line:no-floating-promises
-        this._fetchJSONDocsFireAndForgetAsync(preferredVersionIfExists);
-    }
-    public componentWillUnmount() {
-        this._isUnmounted = true;
+export class Documentation extends React.Component<DocumentationProps, DocumentationState> {
+    public componentDidUpdate(prevProps: DocumentationProps, prevState: DocumentationState) {
+        if (!_.isEqual(prevProps.docAgnosticFormat, this.props.docAgnosticFormat)) {
+            this._scrollToHash();
+        }
     }
     public render() {
-        const menuSubsectionsBySection = _.isUndefined(this.state.docAgnosticFormat)
-            ? {}
-            : this.props.docsInfo.getMenuSubsectionsBySection(this.state.docAgnosticFormat);
         return (
             <div>
-                <DocumentTitle title={`${this.props.docsInfo.displayName} Documentation`} />
-                <TopBar
-                    blockchainIsLoaded={false}
-                    location={this.props.location}
-                    docsVersion={this.props.docsVersion}
-                    availableDocVersions={this.props.availableDocVersions}
-                    menu={this.props.docsInfo.getMenu(this.props.docsVersion)}
-                    menuSubsectionsBySection={menuSubsectionsBySection}
-                    docsInfo={this.props.docsInfo}
-                    translate={this.props.translate}
-                />
-                {_.isUndefined(this.state.docAgnosticFormat) ? (
-                    <div className="col col-12" style={styles.mainContainers}>
-                        <div
-                            className="relative sm-px2 sm-pt2 sm-m1"
-                            style={{ height: 122, top: '50%', transform: 'translateY(-50%)' }}
-                        >
-                            <div className="center pb2">
-                                <CircularProgress size={40} thickness={5} />
-                            </div>
-                            <div className="center pt2" style={{ paddingBottom: 11 }}>
-                                Loading documentation...
-                            </div>
-                        </div>
-                    </div>
+                {_.isUndefined(this.props.docAgnosticFormat) ? (
+                    this._renderLoading()
                 ) : (
                     <div style={{ width: '100%', height: '100%', backgroundColor: colors.gray40 }}>
                         <div
@@ -155,8 +107,7 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
                                         versions={this.props.availableDocVersions}
                                         title={this.props.docsInfo.displayName}
                                         topLevelMenu={this.props.docsInfo.getMenu(this.props.docsVersion)}
-                                        menuSubsectionsBySection={menuSubsectionsBySection}
-                                        docPath={this.props.docsInfo.websitePath}
+                                        menuSubsectionsBySection={this.props.menuSubsectionsBySection}
                                     />
                                 </div>
                             </div>
@@ -175,11 +126,28 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
             </div>
         );
     }
+    private _renderLoading() {
+        return (
+            <div className="col col-12" style={styles.mainContainers}>
+                <div
+                    className="relative sm-px2 sm-pt2 sm-m1"
+                    style={{ height: 122, top: '50%', transform: 'translateY(-50%)' }}
+                >
+                    <div className="center pb2">
+                        <CircularProgress size={40} thickness={5} />
+                    </div>
+                    <div className="center pt2" style={{ paddingBottom: 11 }}>
+                        Loading documentation...
+                    </div>
+                </div>
+            </div>
+        );
+    }
     private _renderDocumentation(): React.ReactNode {
         const subMenus = _.values(this.props.docsInfo.getMenu());
         const orderedSectionNames = _.flatten(subMenus);
 
-        const typeDefinitionByName = this.props.docsInfo.getTypeDefinitionsByName(this.state.docAgnosticFormat);
+        const typeDefinitionByName = this.props.docsInfo.getTypeDefinitionsByName(this.props.docAgnosticFormat);
         const renderedSections = _.map(orderedSectionNames, this._renderSection.bind(this, typeDefinitionByName));
 
         return renderedSections;
@@ -196,7 +164,7 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
             );
         }
 
-        const docSection = this.state.docAgnosticFormat[sectionName];
+        const docSection = this.props.docAgnosticFormat[sectionName];
         if (_.isUndefined(docSection)) {
             return null;
         }
@@ -278,7 +246,13 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
         );
     }
     private _renderNetworkBadgesIfExists(sectionName: string) {
-        const networkToAddressByContractName = configs.CONTRACT_ADDRESS[this.props.docsVersion];
+        if (this.props.docsInfo.type !== SupportedDocJson.Doxity) {
+            return null;
+        }
+
+        const networkToAddressByContractName = this.props.docsInfo.contractsByVersionByNetworkId[
+            this.props.docsVersion
+        ];
         const badges = _.map(
             networkToAddressByContractName,
             (addressByContractName: AddressByContractName, networkName: string) => {
@@ -326,8 +300,7 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
                     <SourceLink
                         version={this.props.docsVersion}
                         source={property.source}
-                        baseUrl={this.props.docsInfo.packageUrl}
-                        subPackageName={this.props.docsInfo.subPackageName}
+                        sourceUrl={this.props.sourceUrl}
                     />
                 )}
                 {property.comment && <Comment comment={property.comment} className="py2" />}
@@ -348,6 +321,7 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
                 typeDefinitionByName={typeDefinitionByName}
                 libraryVersion={this.props.docsVersion}
                 docsInfo={this.props.docsInfo}
+                sourceUrl={this.props.sourceUrl}
             />
         );
     }
@@ -364,38 +338,4 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
             containerId: 'documentation',
         });
     }
-    private async _fetchJSONDocsFireAndForgetAsync(preferredVersionIfExists?: string): Promise<void> {
-        const versionToFileName = await docUtils.getVersionToFileNameAsync(this.props.docsInfo.docsJsonRoot);
-        const versions = _.keys(versionToFileName);
-        this.props.dispatcher.updateAvailableDocVersions(versions);
-        const sortedVersions = semverSort.desc(versions);
-        const latestVersion = sortedVersions[0];
-
-        let versionToFetch = latestVersion;
-        if (!_.isUndefined(preferredVersionIfExists)) {
-            const preferredVersionFileNameIfExists = versionToFileName[preferredVersionIfExists];
-            if (!_.isUndefined(preferredVersionFileNameIfExists)) {
-                versionToFetch = preferredVersionIfExists;
-            }
-        }
-        this.props.dispatcher.updateCurrentDocsVersion(versionToFetch);
-
-        const versionFileNameToFetch = versionToFileName[versionToFetch];
-        const versionDocObj = await docUtils.getJSONDocFileAsync(
-            versionFileNameToFetch,
-            this.props.docsInfo.docsJsonRoot,
-        );
-        const docAgnosticFormat = this.props.docsInfo.convertToDocAgnosticFormat(versionDocObj as DoxityDocObj);
-
-        if (!this._isUnmounted) {
-            this.setState(
-                {
-                    docAgnosticFormat,
-                },
-                () => {
-                    this._scrollToHash();
-                },
-            );
-        }
-    }
 }
diff --git a/packages/website/ts/pages/documentation/method_block.tsx b/packages/website/ts/pages/documentation/method_block.tsx
index 1bc6aa4f4..d2c96bf8c 100644
--- a/packages/website/ts/pages/documentation/method_block.tsx
+++ b/packages/website/ts/pages/documentation/method_block.tsx
@@ -15,6 +15,7 @@ interface MethodBlockProps {
     libraryVersion: string;
     typeDefinitionByName: TypeDefinitionByName;
     docsInfo: DocsInfo;
+    sourceUrl: string;
 }
 
 interface MethodBlockState {
@@ -80,8 +81,7 @@ export class MethodBlock extends React.Component<MethodBlockProps, MethodBlockSt
                     <SourceLink
                         version={this.props.libraryVersion}
                         source={(method as TypescriptMethod).source}
-                        baseUrl={this.props.docsInfo.packageUrl}
-                        subPackageName={this.props.docsInfo.subPackageName}
+                        sourceUrl={this.props.sourceUrl}
                     />
                 )}
                 {method.comment && <Comment comment={method.comment} className="py2" />}
diff --git a/packages/website/ts/pages/documentation/source_link.tsx b/packages/website/ts/pages/documentation/source_link.tsx
index 6588ee39e..31f80aba3 100644
--- a/packages/website/ts/pages/documentation/source_link.tsx
+++ b/packages/website/ts/pages/documentation/source_link.tsx
@@ -5,22 +5,13 @@ import { colors } from 'ts/utils/colors';
 
 interface SourceLinkProps {
     source: Source;
-    baseUrl: string;
+    sourceUrl: string;
     version: string;
-    subPackageName: string;
 }
 
-const packagesWithNamespace = ['connect'];
-
 export function SourceLink(props: SourceLinkProps) {
     const src = props.source;
-    const url = props.baseUrl;
-    const pkg = props.subPackageName;
-    let tagPrefix = pkg;
-    if (_.includes(packagesWithNamespace, pkg)) {
-        tagPrefix = `@0xproject/${pkg}`;
-    }
-    const sourceCodeUrl = `${url}/blob/${tagPrefix}%40${props.version}/packages/${pkg}/${src.fileName}#L${src.line}`;
+    const sourceCodeUrl = `${props.sourceUrl}/${src.fileName}#L${src.line}`;
     return (
         <div className="pt2" style={{ fontSize: 14 }}>
             <a href={sourceCodeUrl} target="_blank" className="underline" style={{ color: colors.grey }}>
diff --git a/packages/website/ts/pages/shared/nested_sidebar_menu.tsx b/packages/website/ts/pages/shared/nested_sidebar_menu.tsx
index ba794ee9f..1a08ca9f9 100644
--- a/packages/website/ts/pages/shared/nested_sidebar_menu.tsx
+++ b/packages/website/ts/pages/shared/nested_sidebar_menu.tsx
@@ -16,7 +16,6 @@ interface NestedSidebarMenuProps {
     onMenuItemClick?: () => void;
     selectedVersion?: string;
     versions?: string[];
-    docPath?: string;
 }
 
 interface NestedSidebarMenuState {}
@@ -69,13 +68,8 @@ export class NestedSidebarMenu extends React.Component<NestedSidebarMenuProps, N
             <div>
                 {this._renderEmblem()}
                 {!_.isUndefined(this.props.versions) &&
-                    !_.isUndefined(this.props.selectedVersion) &&
-                    !_.isUndefined(this.props.docPath) && (
-                        <VersionDropDown
-                            selectedVersion={this.props.selectedVersion}
-                            versions={this.props.versions}
-                            docPath={this.props.docPath}
-                        />
+                    !_.isUndefined(this.props.selectedVersion) && (
+                        <VersionDropDown selectedVersion={this.props.selectedVersion} versions={this.props.versions} />
                     )}
                 <div className="pl1">{navigation}</div>
             </div>
diff --git a/packages/website/ts/pages/shared/version_drop_down.tsx b/packages/website/ts/pages/shared/version_drop_down.tsx
index b922e1048..3b331af9b 100644
--- a/packages/website/ts/pages/shared/version_drop_down.tsx
+++ b/packages/website/ts/pages/shared/version_drop_down.tsx
@@ -6,7 +6,6 @@ import * as React from 'react';
 interface VersionDropDownProps {
     selectedVersion: string;
     versions: string[];
-    docPath: string;
 }
 
 interface VersionDropDownState {}
@@ -31,7 +30,17 @@ export class VersionDropDown extends React.Component<VersionDropDownProps, Versi
         });
         return items;
     }
-    private _updateSelectedVersion(e: any, index: number, value: string) {
-        window.location.href = `${this.props.docPath}/${value}${window.location.hash}`;
+    private _updateSelectedVersion(e: any, index: number, semver: string) {
+        const port = window.location.port;
+        const hasPort = !_.isUndefined(port);
+        let path = window.location.pathname;
+        const lastChar = path[path.length - 1];
+        if (_.isFinite(_.parseInt(lastChar))) {
+            const pathSections = path.split('/');
+            pathSections.pop();
+            path = pathSections.join('/');
+        }
+        const baseUrl = `https://${window.location.hostname}${hasPort ? `:${port}` : ''}${path}`;
+        window.location.href = `${baseUrl}/${semver}${window.location.hash}`;
     }
 }
diff --git a/packages/website/ts/types.ts b/packages/website/ts/types.ts
index f6413eec5..f0db537e6 100644
--- a/packages/website/ts/types.ts
+++ b/packages/website/ts/types.ts
@@ -627,20 +627,39 @@ export interface SectionsMap {
     [sectionName: string]: string;
 }
 
+export enum DocPackages {
+    Connect = 'CONNECT',
+    ZeroExJs = 'ZERO_EX_JS',
+    SmartContracts = 'SMART_CONTRACTS',
+}
+
+export enum SupportedDocJson {
+    Doxity = 'DOXITY',
+    TypeDoc = 'TYPEDOC',
+}
+
+export interface ContractsByVersionByNetworkId {
+    [version: string]: {
+        [networkName: string]: {
+            [contractName: string]: string;
+        };
+    };
+}
+
 export interface DocsInfoConfig {
+    id: string;
+    type: SupportedDocJson;
     displayName: string;
     packageUrl: string;
-    websitePath: string;
-    docsJsonRoot: string;
     menu: DocsMenu;
     sections: SectionsMap;
     sectionNameToMarkdown: { [sectionName: string]: string };
     visibleConstructors: string[];
-    convertToDocAgnosticFormatFn: (docObj: DoxityDocObj | TypeDocNode, docsInfo?: any) => DocAgnosticFormat;
     subPackageName?: string;
     publicTypes?: string[];
     sectionNameToModulePath?: { [sectionName: string]: string[] };
     menuSubsectionToVersionWhenIntroduced?: { [sectionName: string]: string };
+    contractsByVersionByNetworkId?: ContractsByVersionByNetworkId;
 }
 
 export interface TimestampMsRange {
diff --git a/packages/website/ts/utils/configs.ts b/packages/website/ts/utils/configs.ts
index 8e359f8bd..7e9ba69de 100644
--- a/packages/website/ts/utils/configs.ts
+++ b/packages/website/ts/utils/configs.ts
@@ -1,12 +1,5 @@
 import * as _ from 'lodash';
-import {
-    ContractAddresses,
-    Environments,
-    Networks,
-    OutdatedWrappedEtherByNetworkId,
-    PublicNodeUrlsByNetworkId,
-    SmartContractDocSections,
-} from 'ts/types';
+import { ContractAddresses, Environments, OutdatedWrappedEtherByNetworkId, PublicNodeUrlsByNetworkId } from 'ts/types';
 
 const BASE_URL = window.location.origin;
 const isDevelopment = _.includes(
@@ -19,34 +12,6 @@ export const configs = {
     BACKEND_BASE_URL: 'https://website-api.0xproject.com',
     BASE_URL,
     BITLY_ACCESS_TOKEN: 'ffc4c1a31e5143848fb7c523b39f91b9b213d208',
-    CONTRACT_ADDRESS: {
-        '1.0.0': {
-            [Networks.Mainnet]: {
-                [SmartContractDocSections.Exchange]: '0x12459c951127e0c374ff9105dda097662a027093',
-                [SmartContractDocSections.TokenTransferProxy]: '0x8da0d80f5007ef1e431dd2127178d224e32c2ef4',
-                [SmartContractDocSections.ZRXToken]: '0xe41d2489571d322189246dafa5ebde1f4699f498',
-                [SmartContractDocSections.TokenRegistry]: '0x926a74c5c36adf004c87399e65f75628b0f98d2c',
-            },
-            [Networks.Ropsten]: {
-                [SmartContractDocSections.Exchange]: '0x479cc461fecd078f766ecc58533d6f69580cf3ac',
-                [SmartContractDocSections.TokenTransferProxy]: '0x4e9aad8184de8833365fea970cd9149372fdf1e6',
-                [SmartContractDocSections.ZRXToken]: '0xa8e9fa8f91e5ae138c74648c9c304f1c75003a8d',
-                [SmartContractDocSections.TokenRegistry]: '0x6b1a50f0bb5a7995444bd3877b22dc89c62843ed',
-            },
-            [Networks.Kovan]: {
-                [SmartContractDocSections.Exchange]: '0x90fe2af704b34e0224bf2299c838e04d4dcf1364',
-                [SmartContractDocSections.TokenTransferProxy]: '0x087Eed4Bc1ee3DE49BeFbd66C662B434B15d49d4',
-                [SmartContractDocSections.ZRXToken]: '0x6ff6c0ff1d68b964901f986d4c9fa3ac68346570',
-                [SmartContractDocSections.TokenRegistry]: '0xf18e504561f4347bea557f3d4558f559dddbae7f',
-            },
-            [Networks.Rinkeby]: {
-                [SmartContractDocSections.Exchange]: '0x1d16ef40fac01cec8adac2ac49427b9384192c05',
-                [SmartContractDocSections.TokenTransferProxy]: '0xa8e9fa8f91e5ae138c74648c9c304f1c75003a8d',
-                [SmartContractDocSections.ZRXToken]: '0x00f58d6d585f84b2d7267940cede30ce2fe6eae8',
-                [SmartContractDocSections.TokenRegistry]: '0x4e9aad8184de8833365fea970cd9149372fdf1e6',
-            },
-        },
-    } as ContractAddresses,
     DEFAULT_DERIVATION_PATH: `44'/60'/0'`,
     // WARNING: ZRX & WETH MUST always be default trackedTokens
     DEFAULT_TRACKED_TOKEN_SYMBOLS: ['WETH', 'ZRX'],
diff --git a/packages/website/ts/utils/constants.ts b/packages/website/ts/utils/constants.ts
index 6af821dbe..3476b7375 100644
--- a/packages/website/ts/utils/constants.ts
+++ b/packages/website/ts/utils/constants.ts
@@ -42,6 +42,7 @@ export const constants = {
     PROVIDER_NAME_GENERIC: 'Injected Web3',
     PROVIDER_NAME_PUBLIC: '0x Public',
     ROLLBAR_ACCESS_TOKEN: 'a6619002b51c4464928201e6ea94de65',
+    S3_BUCKET_ROOT: 'https://s3.amazonaws.com',
     SUCCESS_STATUS: 200,
     UNAVAILABLE_STATUS: 503,
     TAKER_FEE: new BigNumber(0),
diff --git a/packages/website/ts/utils/doxity_utils.ts b/packages/website/ts/utils/doxity_utils.ts
index 5f1d02132..35ce05672 100644
--- a/packages/website/ts/utils/doxity_utils.ts
+++ b/packages/website/ts/utils/doxity_utils.ts
@@ -45,11 +45,17 @@ export const doxityUtils = {
             const methods: SolidityMethod[] = _.map<DoxityAbiDoc, SolidityMethod>(
                 doxityMethods,
                 (doxityMethod: DoxityAbiDoc) => {
-                    // We assume that none of our functions returns more then a single value
-                    const outputIfExists = !_.isUndefined(doxityMethod.outputs) ? doxityMethod.outputs[0] : undefined;
-                    const returnTypeIfExists = !_.isUndefined(outputIfExists)
-                        ? this._convertType(outputIfExists.type)
-                        : undefined;
+                    const outputs = !_.isUndefined(doxityMethod.outputs) ? doxityMethod.outputs : [];
+                    let returnTypeIfExists: Type;
+                    if (outputs.length === 0) {
+                        // no-op. It's already undefined
+                    } else if (outputs.length === 1) {
+                        const outputsType = outputs[0].type;
+                        returnTypeIfExists = this._convertType(outputsType);
+                    } else {
+                        const outputsType = `[${_.map(outputs, output => output.type).join(', ')}]`;
+                        returnTypeIfExists = this._convertType(outputsType);
+                    }
                     // For ZRXToken, we want to convert it to zrxToken, rather then simply zRXToken
                     const callPath =
                         contractName !== 'ZRXToken'
diff --git a/packages/website/ts/utils/typedoc_utils.ts b/packages/website/ts/utils/typedoc_utils.ts
index 11ec8da58..992475911 100644
--- a/packages/website/ts/utils/typedoc_utils.ts
+++ b/packages/website/ts/utils/typedoc_utils.ts
@@ -4,6 +4,7 @@ import {
     CustomType,
     CustomTypeChild,
     DocAgnosticFormat,
+    DocPackages,
     DocSection,
     IndexSignature,
     KindString,
@@ -108,7 +109,7 @@ export const typeDocUtils = {
                         isConstructor,
                         docsInfo.sections,
                         sectionName,
-                        docsInfo.subPackageName,
+                        docsInfo.id,
                     );
                     docSection.constructors.push(constructor);
                     break;
@@ -121,7 +122,7 @@ export const typeDocUtils = {
                             isConstructor,
                             docsInfo.sections,
                             sectionName,
-                            docsInfo.subPackageName,
+                            docsInfo.id,
                         );
                         docSection.methods.push(method);
                     }
@@ -133,7 +134,7 @@ export const typeDocUtils = {
                             entity,
                             docsInfo.sections,
                             sectionName,
-                            docsInfo.subPackageName,
+                            docsInfo.id,
                         );
                         docSection.properties.push(property);
                     }
@@ -149,7 +150,7 @@ export const typeDocUtils = {
                             entity,
                             docsInfo.sections,
                             sectionName,
-                            docsInfo.subPackageName,
+                            docsInfo.id,
                         );
                         docSection.types.push(customType);
                     }
@@ -161,21 +162,16 @@ export const typeDocUtils = {
         });
         return docSection;
     },
-    _convertCustomType(
-        entity: TypeDocNode,
-        sections: SectionsMap,
-        sectionName: string,
-        subPackageName: string,
-    ): CustomType {
+    _convertCustomType(entity: TypeDocNode, sections: SectionsMap, sectionName: string, docId: string): CustomType {
         const typeIfExists = !_.isUndefined(entity.type)
-            ? typeDocUtils._convertType(entity.type, sections, sectionName, subPackageName)
+            ? typeDocUtils._convertType(entity.type, sections, sectionName, docId)
             : undefined;
         const isConstructor = false;
         const methodIfExists = !_.isUndefined(entity.declaration)
-            ? typeDocUtils._convertMethod(entity.declaration, isConstructor, sections, sectionName, subPackageName)
+            ? typeDocUtils._convertMethod(entity.declaration, isConstructor, sections, sectionName, docId)
             : undefined;
         const indexSignatureIfExists = !_.isUndefined(entity.indexSignature)
-            ? typeDocUtils._convertIndexSignature(entity.indexSignature[0], sections, sectionName, subPackageName)
+            ? typeDocUtils._convertIndexSignature(entity.indexSignature[0], sections, sectionName, docId)
             : undefined;
         const commentIfExists =
             !_.isUndefined(entity.comment) && !_.isUndefined(entity.comment.shortText)
@@ -185,7 +181,7 @@ export const typeDocUtils = {
         const childrenIfExist = !_.isUndefined(entity.children)
             ? _.map(entity.children, (child: TypeDocNode) => {
                   const childTypeIfExists = !_.isUndefined(child.type)
-                      ? typeDocUtils._convertType(child.type, sections, sectionName, subPackageName)
+                      ? typeDocUtils._convertType(child.type, sections, sectionName, docId)
                       : undefined;
                   const c: CustomTypeChild = {
                       name: child.name,
@@ -212,27 +208,22 @@ export const typeDocUtils = {
         entity: TypeDocNode,
         sections: SectionsMap,
         sectionName: string,
-        subPackageName: string,
+        docId: string,
     ): IndexSignature {
         const key = entity.parameters[0];
         const indexSignature = {
             keyName: key.name,
-            keyType: typeDocUtils._convertType(key.type, sections, sectionName, subPackageName),
+            keyType: typeDocUtils._convertType(key.type, sections, sectionName, docId),
             valueName: entity.type.name,
         };
         return indexSignature;
     },
-    _convertProperty(
-        entity: TypeDocNode,
-        sections: SectionsMap,
-        sectionName: string,
-        subPackageName: string,
-    ): Property {
+    _convertProperty(entity: TypeDocNode, sections: SectionsMap, sectionName: string, docId: string): Property {
         const source = entity.sources[0];
         const commentIfExists = !_.isUndefined(entity.comment) ? entity.comment.shortText : undefined;
         const property = {
             name: entity.name,
-            type: typeDocUtils._convertType(entity.type, sections, sectionName, subPackageName),
+            type: typeDocUtils._convertType(entity.type, sections, sectionName, docId),
             source: {
                 fileName: source.fileName,
                 line: source.line,
@@ -246,7 +237,7 @@ export const typeDocUtils = {
         isConstructor: boolean,
         sections: SectionsMap,
         sectionName: string,
-        subPackageName: string,
+        docId: string,
     ): TypescriptMethod {
         const signature = entity.signatures[0];
         const source = entity.sources[0];
@@ -258,7 +249,7 @@ export const typeDocUtils = {
         let callPath;
         if (isConstructor || entity.name === '__type') {
             callPath = '';
-        } else if (subPackageName === '0x.js') {
+        } else if (docId === DocPackages.ZeroExJs) {
             const topLevelInterface = isStatic ? 'ZeroEx.' : 'zeroEx.';
             callPath =
                 !_.isUndefined(sections.zeroEx) && sectionName !== sections.zeroEx
@@ -269,12 +260,12 @@ export const typeDocUtils = {
         }
 
         const parameters = _.map(signature.parameters, param => {
-            return typeDocUtils._convertParameter(param, sections, sectionName, subPackageName);
+            return typeDocUtils._convertParameter(param, sections, sectionName, docId);
         });
-        const returnType = typeDocUtils._convertType(signature.type, sections, sectionName, subPackageName);
+        const returnType = typeDocUtils._convertType(signature.type, sections, sectionName, docId);
         const typeParameter = _.isUndefined(signature.typeParameter)
             ? undefined
-            : typeDocUtils._convertTypeParameter(signature.typeParameter[0], sections, sectionName, subPackageName);
+            : typeDocUtils._convertTypeParameter(signature.typeParameter[0], sections, sectionName, docId);
 
         const method = {
             isConstructor,
@@ -297,21 +288,16 @@ export const typeDocUtils = {
         entity: TypeDocNode,
         sections: SectionsMap,
         sectionName: string,
-        subPackageName: string,
+        docId: string,
     ): TypeParameter {
-        const type = typeDocUtils._convertType(entity.type, sections, sectionName, subPackageName);
+        const type = typeDocUtils._convertType(entity.type, sections, sectionName, docId);
         const parameter = {
             name: entity.name,
             type,
         };
         return parameter;
     },
-    _convertParameter(
-        entity: TypeDocNode,
-        sections: SectionsMap,
-        sectionName: string,
-        subPackageName: string,
-    ): Parameter {
+    _convertParameter(entity: TypeDocNode, sections: SectionsMap, sectionName: string, docId: string): Parameter {
         let comment = '<No comment>';
         if (entity.comment && entity.comment.shortText) {
             comment = entity.comment.shortText;
@@ -321,7 +307,7 @@ export const typeDocUtils = {
 
         const isOptional = !_.isUndefined(entity.flags.isOptional) ? entity.flags.isOptional : false;
 
-        const type = typeDocUtils._convertType(entity.type, sections, sectionName, subPackageName);
+        const type = typeDocUtils._convertType(entity.type, sections, sectionName, docId);
 
         const parameter = {
             name: entity.name,
@@ -331,17 +317,17 @@ export const typeDocUtils = {
         };
         return parameter;
     },
-    _convertType(entity: TypeDocType, sections: SectionsMap, sectionName: string, subPackageName: string): Type {
+    _convertType(entity: TypeDocType, sections: SectionsMap, sectionName: string, docId: string): Type {
         const typeArguments = _.map(entity.typeArguments, typeArgument => {
-            return typeDocUtils._convertType(typeArgument, sections, sectionName, subPackageName);
+            return typeDocUtils._convertType(typeArgument, sections, sectionName, docId);
         });
         const types = _.map(entity.types, t => {
-            return typeDocUtils._convertType(t, sections, sectionName, subPackageName);
+            return typeDocUtils._convertType(t, sections, sectionName, docId);
         });
 
         const isConstructor = false;
         const methodIfExists = !_.isUndefined(entity.declaration)
-            ? typeDocUtils._convertMethod(entity.declaration, isConstructor, sections, sectionName, subPackageName)
+            ? typeDocUtils._convertMethod(entity.declaration, isConstructor, sections, sectionName, docId)
             : undefined;
 
         const elementTypeIfExists = !_.isUndefined(entity.elementType)
diff --git a/packages/website/tsconfig.json b/packages/website/tsconfig.json
index 38b177d0b..99f465bc2 100644
--- a/packages/website/tsconfig.json
+++ b/packages/website/tsconfig.json
@@ -13,5 +13,9 @@
             "*": ["node_modules/@types/*", "*"]
         }
     },
-    "include": ["./ts/**/*", "../../node_modules/web3-typescript-typings/index.d.ts"]
+    "include": [
+        "./ts/**/*",
+        "../../node_modules/web3-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts"
+    ]
 }
diff --git a/yarn.lock b/yarn.lock
index c9a5942b4..5ac18dc23 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3302,6 +3302,21 @@ ethereumjs-wallet@^0.6.0:
     utf8 "^2.1.1"
     uuid "^2.0.1"
 
+ethers-contracts@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/ethers-contracts/-/ethers-contracts-2.2.1.tgz#e2bf5dd5e157313ba454b50c646c8472fcd0a8b3"
+  dependencies:
+    ethers-utils "^2.1.0"
+
+ethers-utils@^2.1.0:
+  version "2.1.11"
+  resolved "https://registry.yarnpkg.com/ethers-utils/-/ethers-utils-2.1.11.tgz#b27535ca3226118be300211c39c896b1e5e21641"
+  dependencies:
+    bn.js "^4.4.0"
+    hash.js "^1.0.0"
+    js-sha3 "0.5.7"
+    xmlhttprequest "1.8.0"
+
 ethjs-abi@0.1.8:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/ethjs-abi/-/ethjs-abi-0.1.8.tgz#cd288583ed628cdfadaf8adefa3ba1dbcbca6c18"
@@ -5094,6 +5109,10 @@ js-sha3@0.5.5:
   version "0.5.5"
   resolved "https://registry.yarnpkg.com/js-sha3/-/js-sha3-0.5.5.tgz#baf0c0e8c54ad5903447df96ade7a4a1bca79a4a"
 
+js-sha3@0.5.7:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/js-sha3/-/js-sha3-0.5.7.tgz#0d4ffd8002d5333aabaf4a23eed2f6374c9f28e7"
+
 js-sha3@^0.3.1:
   version "0.3.1"
   resolved "https://registry.yarnpkg.com/js-sha3/-/js-sha3-0.3.1.tgz#86122802142f0828502a0d1dee1d95e253bb0243"
@@ -7252,9 +7271,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@1.9.2:
-  version "1.9.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.9.2.tgz#96bc2132f7a32338e6078aeb29727178c6335827"
+prettier@^1.11.0:
+  version "1.11.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.11.0.tgz#c024f70cab158c993f50fc0c25ffe738cb8b0f85"
 
 pretty-bytes@^1.0.4:
   version "1.0.4"
@@ -10205,11 +10224,7 @@ xml-js@^1.3.2:
   dependencies:
     sax "^1.2.4"
 
-xmlbuilder@9.0.4:
-  version "9.0.4"
-  resolved "https://registry.yarnpkg.com/xmlbuilder/-/xmlbuilder-9.0.4.tgz#519cb4ca686d005a8420d3496f3f0caeecca580f"
-
-xmlhttprequest@*:
+xmlhttprequest@*, xmlhttprequest@1.8.0:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz#67fe075c5c24fef39f9d65f5f7b7fe75171968fc"