Merge branch 'development' into feature/portal-ledger-support

* development: (437 commits)
  Publish
  Update yarn.lock
  Update the CHANGELOG
  Fix the bug making it impossible to specify the custom ZRX address
  Fix fill/cancel order by looking for NoError instead of empty blockchainErr given the BlockchainErrs type refactor
  Add a comment about a yarn bug
  Add our mainnet and kovan nodes as backups for Portal requests
  Fix bug hiding the user info from topBar
  Add dev-utils package to top level README
  Prettier newline
  Prettier
  Allow Token symbols to be alphanumeric
  Update CHANGELOG, rebase on development
  Should not -> cannot
  Reject negative amounts in isValidBaseUnitAmount
  Re-add changelog for 0x.js
  Fix prettier
  Update yarn.lock
  Move tests to a separate folder
  Change file layout
  ...

# Conflicts:
#	packages/website/README.md

28 files changed, 432 insertions, 330 deletions

diff --git a/packages/connect/CHANGELOG.md b/packages/connect/CHANGELOG.md
index cf507dbe6..e02020204 100644
--- a/packages/connect/CHANGELOG.md
+++ b/packages/connect/CHANGELOG.md
@@ -1,16 +1,26 @@
 # CHANGELOG
 
-vx.x.x
-------------------------
+## v0.5.0 - _January 17, 2018_
+
+    * Sanitize api endpoint url and remove trailing slashes (#318)
+    * Improve error message text in HttpClient (#318)
+    * Stop appending '/v0' to api endpoint url in HttpClient (#318)
+
+## v0.4.0 - _January 11, 2018_
+
+    * Prevent getFeesAsync method on HttpClient from mutating input (#296)
+
+## v0.3.0 - _December 8, 2017_
+
     * Expose WebSocketOrderbookChannel and associated types to public interface (#251)
     * Remove tokenA and tokenB fields from OrdersRequest (#256)
 
-v0.2.0 - _November 29, 2017_
-------------------------
+## v0.2.0 - _November 29, 2017_
+
     * Add SignedOrder and TokenTradeInfo to the public interface
     * Add ECSignature and Order to the public interface
     * Remove dependency on 0x.js
 
-v0.1.0 - _November 22, 2017_
-------------------------
+## v0.1.0 - _November 22, 2017_
+
     * Provide a HttpClient class for interacting with standard relayer api compliant HTTP urls
diff --git a/packages/connect/README.md b/packages/connect/README.md
index 900045526..63faf5271 100644
--- a/packages/connect/README.md
+++ b/packages/connect/README.md
@@ -1 +1,52 @@
+## @0xproject/connect
+
 This repository contains a Javascript library that makes it easy to interact with Relayers that conform to the [Standard Relayer API](https://github.com/0xProject/standard-relayer-api)
+
+## Installation
+
+```bash
+yarn add @0xproject/connect
+```
+
+## Usage
+
+* [Docs](https://0xproject.com/docs/connect)
+* [Tutorials](https://0xproject.com/wiki#connect)
+
+## 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
+```
+
+### Lint
+
+```bash
+yarn lint
+```
+
+### Run Tests
+
+```bash
+yarn test
+```
diff --git a/packages/connect/package.json b/packages/connect/package.json
index 2392d9907..a28916903 100644
--- a/packages/connect/package.json
+++ b/packages/connect/package.json
@@ -1,69 +1,69 @@
 {
-  "name": "@0xproject/connect",
-  "version": "0.2.0",
-  "description": "A javascript library for interacting with the standard relayer api",
-  "keywords": [
-    "connect",
-    "0xproject",
-    "ethereum",
-    "tokens",
-    "exchange"
-  ],
-  "main": "lib/src/index.js",
-  "types": "lib/src/index.d.ts",
-  "scripts": {
-    "build": "tsc",
-    "clean": "shx rm -rf _bundles lib test_temp",
-    "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",
-    "copy_test_fixtures": "copyfiles -u 2 './test/fixtures/**/*.json' ./lib/test/fixtures",
-    "lint": "tslint --project . 'src/**/*.ts' 'test/**/*.ts'",
-    "run_mocha": "mocha lib/test/**/*_test.js",
-    "test": "run-s clean build copy_test_fixtures run_mocha",
-    "test:circleci": "yarn test"
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/0xProject/0x.js.git"
-  },
-  "author": "Brandon Millman",
-  "license": "Apache-2.0",
-  "engines": {
-    "node": ">=6.0.0"
-  },
-  "bugs": {
-    "url": "https://github.com/0xProject/0x.js/issues"
-  },
-  "homepage": "https://github.com/0xProject/0x.js/packages/connect/README.md",
-  "dependencies": {
-    "@0xproject/assert": "^0.0.6",
-    "@0xproject/json-schemas": "^0.6.9",
-    "bignumber.js": "~4.1.0",
-    "isomorphic-fetch": "^2.2.1",
-    "lodash": "^4.17.4",
-    "query-string": "^5.0.1",
-    "websocket": "^1.0.25"
-  },
-  "devDependencies": {
-    "@0xproject/tslint-config": "^0.2.0",
-    "@types/fetch-mock": "^5.12.1",
-    "@types/lodash": "^4.14.86",
-    "@types/mocha": "^2.2.42",
-    "@types/query-string": "^5.0.1",
-    "@types/websocket": "^0.0.34",
-    "chai": "^4.0.1",
-    "chai-as-promised": "^7.1.0",
-    "chai-as-promised-typescript-typings": "^0.0.3",
-    "chai-typescript-typings": "^0.0.1",
-    "copyfiles": "^1.2.0",
-    "dirty-chai": "^2.0.1",
-    "fetch-mock": "^5.13.1",
-    "mocha": "^4.0.1",
-    "npm-run-all": "^4.1.2",
-    "shx": "^0.2.2",
-    "tslint": "5.8.0",
-    "typedoc": "~0.8.0",
-    "typescript": "~2.6.1",
-    "web3-typescript-typings": "^0.7.2"
-  }
+    "name": "@0xproject/connect",
+    "version": "0.5.1",
+    "description": "A javascript library for interacting with the standard relayer api",
+    "keywords": [
+        "connect",
+        "0xproject",
+        "ethereum",
+        "tokens",
+        "exchange"
+    ],
+    "main": "lib/src/index.js",
+    "types": "lib/src/index.d.ts",
+    "scripts": {
+        "build": "tsc",
+        "clean": "shx rm -rf _bundles lib test_temp",
+        "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",
+        "copy_test_fixtures": "copyfiles -u 2 './test/fixtures/**/*.json' ./lib/test/fixtures",
+        "lint": "tslint --project . 'src/**/*.ts' 'test/**/*.ts'",
+        "run_mocha": "mocha lib/test/**/*_test.js",
+        "test": "run-s clean build copy_test_fixtures run_mocha",
+        "test:circleci": "yarn test"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/0xProject/0x.js.git"
+    },
+    "author": "Brandon Millman",
+    "license": "Apache-2.0",
+    "engines": {
+        "node": ">=6.0.0"
+    },
+    "bugs": {
+        "url": "https://github.com/0xProject/0x.js/issues"
+    },
+    "homepage": "https://github.com/0xProject/0x.js/packages/connect/README.md",
+    "dependencies": {
+        "@0xproject/assert": "^0.0.12",
+        "@0xproject/json-schemas": "^0.7.4",
+        "@0xproject/utils": "^0.2.1",
+        "isomorphic-fetch": "^2.2.1",
+        "lodash": "^4.17.4",
+        "query-string": "^5.0.1",
+        "websocket": "^1.0.25"
+    },
+    "devDependencies": {
+        "@0xproject/tslint-config": "^0.4.3",
+        "@types/fetch-mock": "^5.12.1",
+        "@types/lodash": "^4.14.86",
+        "@types/mocha": "^2.2.42",
+        "@types/query-string": "^5.0.1",
+        "@types/websocket": "^0.0.34",
+        "chai": "^4.0.1",
+        "chai-as-promised": "^7.1.0",
+        "chai-as-promised-typescript-typings": "^0.0.5",
+        "chai-typescript-typings": "^0.0.2",
+        "copyfiles": "^1.2.0",
+        "dirty-chai": "^2.0.1",
+        "fetch-mock": "^5.13.1",
+        "mocha": "^4.0.1",
+        "npm-run-all": "^4.1.2",
+        "shx": "^0.2.2",
+        "tslint": "5.8.0",
+        "typedoc": "~0.8.0",
+        "typescript": "~2.6.1",
+        "web3-typescript-typings": "^0.9.5"
+    }
 }
diff --git a/packages/connect/scripts/postpublish.js b/packages/connect/scripts/postpublish.js
index e6a2cc065..24384b228 100644
--- a/packages/connect/scripts/postpublish.js
+++ b/packages/connect/scripts/postpublish.js
@@ -8,22 +8,20 @@ const S3BucketPath = 's3://connect-docs-jsons/';
 
 let tag;
 let version;
-postpublish_utils.getLatestTagAndVersionAsync(subPackageName)
+postpublish_utils
+    .getLatestTagAndVersionAsync(subPackageName)
     .then(function(result) {
         tag = result.tag;
         version = result.version;
-         const releaseName = postpublish_utils.getReleaseName(subPackageName, version);
-         return postpublish_utils.publishReleaseNotes(tag, releaseName);
+        const releaseName = postpublish_utils.getReleaseName(subPackageName, version);
+        return postpublish_utils.publishReleaseNotes(tag, releaseName);
     })
     .then(function(release) {
         console.log('POSTPUBLISH: Release successful, generating docs...');
         const jsonFilePath = __dirname + '/../' + postpublish_utils.generatedDocsDirectoryName + '/index.json';
-        return execAsync(
-            'JSON_FILE_PATH=' + jsonFilePath + ' PROJECT_DIR=' + __dirname + '/.. yarn docs:json',
-            {
-                cwd,
-            }
-        );
+        return execAsync('JSON_FILE_PATH=' + jsonFilePath + ' PROJECT_DIR=' + __dirname + '/.. yarn docs:json', {
+            cwd,
+        });
     })
     .then(function(result) {
         if (result.stderr !== '') {
@@ -35,6 +33,7 @@ postpublish_utils.getLatestTagAndVersionAsync(subPackageName)
         return execAsync('S3_URL=' + s3Url + ' yarn upload_docs_json', {
             cwd,
         });
-    }).catch (function(err) {
+    })
+    .catch(function(err) {
         throw err;
     });
diff --git a/packages/connect/src/http_client.ts b/packages/connect/src/http_client.ts
index 252c9e9dd..3df77b0f0 100644
--- a/packages/connect/src/http_client.ts
+++ b/packages/connect/src/http_client.ts
@@ -1,11 +1,10 @@
-import {assert} from '@0xproject/assert';
-import {schemas} from '@0xproject/json-schemas';
-import {BigNumber} from 'bignumber.js';
+import { assert } from '@0xproject/assert';
+import { schemas } from '@0xproject/json-schemas';
 import 'isomorphic-fetch';
 import * as _ from 'lodash';
 import * as queryString from 'query-string';
 
-import {schemas as clientSchemas} from './schemas/schemas';
+import { schemas as clientSchemas } from './schemas/schemas';
 import {
     Client,
     FeesRequest,
@@ -19,19 +18,15 @@ import {
     TokenPairsItem,
     TokenPairsRequest,
 } from './types';
-import {typeConverters} from './utils/type_converters';
-
-// TODO: move this and bigNumberConfigs in the 0x.js package into one place
-BigNumber.config({
-    EXPONENTIAL_AT: 1000,
-});
+import { relayerResponseJsonParsers } from './utils/relayer_response_json_parsers';
 
+const TRAILING_SLASHES_REGEX = /\/+$/;
 /**
  * This class includes all the functionality related to interacting with a set of HTTP endpoints
  * that implement the standard relayer API v0
  */
 export class HttpClient implements Client {
-    private apiEndpointUrl: string;
+    private _apiEndpointUrl: string;
     /**
      * Instantiates a new HttpClient instance
      * @param   url    The relayer API base HTTP url you would like to interact with
@@ -39,7 +34,7 @@ export class HttpClient implements Client {
      */
     constructor(url: string) {
         assert.isHttpUrl('url', url);
-        this.apiEndpointUrl = url;
+        this._apiEndpointUrl = url.replace(TRAILING_SLASHES_REGEX, ''); // remove trailing slashes
     }
     /**
      * Retrieve token pair info from the API
@@ -54,17 +49,8 @@ export class HttpClient implements Client {
         const requestOpts = {
             params: request,
         };
-        const tokenPairs = await this._requestAsync('/token_pairs', HttpRequestType.Get, requestOpts);
-        assert.doesConformToSchema(
-            'tokenPairs', tokenPairs, schemas.relayerApiTokenPairsResponseSchema);
-        _.each(tokenPairs, (tokenPair: object) => {
-            typeConverters.convertStringsFieldsToBigNumbers(tokenPair, [
-                'tokenA.minAmount',
-                'tokenA.maxAmount',
-                'tokenB.minAmount',
-                'tokenB.maxAmount',
-            ]);
-        });
+        const responseJson = await this._requestAsync('/token_pairs', HttpRequestType.Get, requestOpts);
+        const tokenPairs = relayerResponseJsonParsers.parseTokenPairsJson(responseJson);
         return tokenPairs;
     }
     /**
@@ -79,9 +65,8 @@ export class HttpClient implements Client {
         const requestOpts = {
             params: request,
         };
-        const orders = await this._requestAsync(`/orders`, HttpRequestType.Get, requestOpts);
-        assert.doesConformToSchema('orders', orders, schemas.signedOrdersSchema);
-        _.each(orders, (order: object) => typeConverters.convertOrderStringFieldsToBigNumber(order));
+        const responseJson = await this._requestAsync(`/orders`, HttpRequestType.Get, requestOpts);
+        const orders = relayerResponseJsonParsers.parseOrdersJson(responseJson);
         return orders;
     }
     /**
@@ -91,9 +76,8 @@ export class HttpClient implements Client {
      */
     public async getOrderAsync(orderHash: string): Promise<SignedOrder> {
         assert.doesConformToSchema('orderHash', orderHash, schemas.orderHashSchema);
-        const order = await this._requestAsync(`/order/${orderHash}`, HttpRequestType.Get);
-        assert.doesConformToSchema('order', order, schemas.signedOrderSchema);
-        typeConverters.convertOrderStringFieldsToBigNumber(order);
+        const responseJson = await this._requestAsync(`/order/${orderHash}`, HttpRequestType.Get);
+        const order = relayerResponseJsonParsers.parseOrderJson(responseJson);
         return order;
     }
     /**
@@ -106,10 +90,9 @@ export class HttpClient implements Client {
         const requestOpts = {
             params: request,
         };
-        const orderBook = await this._requestAsync('/orderbook', HttpRequestType.Get, requestOpts);
-        assert.doesConformToSchema('orderBook', orderBook, schemas.relayerApiOrderBookResponseSchema);
-        typeConverters.convertOrderbookStringFieldsToBigNumber(orderBook);
-        return orderBook;
+        const responseJson = await this._requestAsync('/orderbook', HttpRequestType.Get, requestOpts);
+        const orderbook = relayerResponseJsonParsers.parseOrderbookResponseJson(responseJson);
+        return orderbook;
     }
     /**
      * Retrieve fee information from the API
@@ -118,18 +101,11 @@ export class HttpClient implements Client {
      */
     public async getFeesAsync(request: FeesRequest): Promise<FeesResponse> {
         assert.doesConformToSchema('request', request, schemas.relayerApiFeesPayloadSchema);
-        typeConverters.convertBigNumberFieldsToStrings(request, [
-            'makerTokenAmount',
-            'takerTokenAmount',
-            'expirationUnixTimestampSec',
-            'salt',
-        ]);
         const requestOpts = {
             payload: request,
         };
-        const fees = await this._requestAsync('/fees', HttpRequestType.Post, requestOpts);
-        assert.doesConformToSchema('fees', fees, schemas.relayerApiFeesResponseSchema);
-        typeConverters.convertStringsFieldsToBigNumbers(fees, ['makerFee', 'takerFee']);
+        const responseJson = await this._requestAsync('/fees', HttpRequestType.Post, requestOpts);
+        const fees = relayerResponseJsonParsers.parseFeesResponseJson(responseJson);
         return fees;
     }
     /**
@@ -143,8 +119,11 @@ export class HttpClient implements Client {
         };
         await this._requestAsync('/order', HttpRequestType.Post, requestOpts);
     }
-    private async _requestAsync(path: string, requestType: HttpRequestType,
-                                requestOptions?: HttpRequestOptions): Promise<any> {
+    private async _requestAsync(
+        path: string,
+        requestType: HttpRequestType,
+        requestOptions?: HttpRequestOptions,
+    ): Promise<any> {
         const params = _.get(requestOptions, 'params');
         const payload = _.get(requestOptions, 'payload');
         let query = '';
@@ -152,20 +131,22 @@ export class HttpClient implements Client {
             const stringifiedParams = queryString.stringify(params);
             query = `?${stringifiedParams}`;
         }
-        const url = `${this.apiEndpointUrl}/v0${path}${query}`;
+        const url = `${this._apiEndpointUrl}${path}${query}`;
         const headers = new Headers({
             'content-type': 'application/json',
         });
-
         const response = await fetch(url, {
             method: requestType,
             body: JSON.stringify(payload),
             headers,
         });
+        const json = await response.json();
         if (!response.ok) {
-            throw Error(response.statusText);
+            const errorString = `${response.status} - ${response.statusText}\n${requestType} ${url}\n${JSON.stringify(
+                json,
+            )}`;
+            throw Error(errorString);
         }
-        const json = await response.json();
         return json;
     }
 }
diff --git a/packages/connect/src/index.ts b/packages/connect/src/index.ts
index ec369a606..a492f5ae9 100644
--- a/packages/connect/src/index.ts
+++ b/packages/connect/src/index.ts
@@ -1,5 +1,5 @@
-export {HttpClient} from './http_client';
-export {WebSocketOrderbookChannel} from './ws_orderbook_channel';
+export { HttpClient } from './http_client';
+export { WebSocketOrderbookChannel } from './ws_orderbook_channel';
 export {
     Client,
     ECSignature,
diff --git a/packages/connect/src/schemas/relayer_fees_request_schema.ts b/packages/connect/src/schemas/relayer_fees_request_schema.ts
index 9408c94a0..f20e077ba 100644
--- a/packages/connect/src/schemas/relayer_fees_request_schema.ts
+++ b/packages/connect/src/schemas/relayer_fees_request_schema.ts
@@ -2,7 +2,7 @@ export const relayerOrderBookRequestSchema = {
     id: '/RelayerOrderBookRequest',
     type: 'object',
     properties: {
-        baseTokenAddress: {$ref: '/Address'},
-        quoteTokenAddress: {$ref: '/Address'},
+        baseTokenAddress: { $ref: '/Address' },
+        quoteTokenAddress: { $ref: '/Address' },
     },
 };
diff --git a/packages/connect/src/schemas/relayer_orderbook_request_schema.ts b/packages/connect/src/schemas/relayer_orderbook_request_schema.ts
index 9408c94a0..f20e077ba 100644
--- a/packages/connect/src/schemas/relayer_orderbook_request_schema.ts
+++ b/packages/connect/src/schemas/relayer_orderbook_request_schema.ts
@@ -2,7 +2,7 @@ export const relayerOrderBookRequestSchema = {
     id: '/RelayerOrderBookRequest',
     type: 'object',
     properties: {
-        baseTokenAddress: {$ref: '/Address'},
-        quoteTokenAddress: {$ref: '/Address'},
+        baseTokenAddress: { $ref: '/Address' },
+        quoteTokenAddress: { $ref: '/Address' },
     },
 };
diff --git a/packages/connect/src/schemas/relayer_orders_request_schema.ts b/packages/connect/src/schemas/relayer_orders_request_schema.ts
index c11bc77be..570238dae 100644
--- a/packages/connect/src/schemas/relayer_orders_request_schema.ts
+++ b/packages/connect/src/schemas/relayer_orders_request_schema.ts
@@ -2,15 +2,15 @@ export const relayerOrdersRequestSchema = {
     id: '/RelayerOrdersRequest',
     type: 'object',
     properties: {
-        exchangeContractAddress: {$ref: '/Address'},
-        tokenAddress: {$ref: '/Address'},
-        makerTokenAddress: {$ref: '/Address'},
-        takerTokenAddress: {$ref: '/Address'},
-        tokenA: {$ref: '/Address'},
-        tokenB: {$ref: '/Address'},
-        maker: {$ref: '/Address'},
-        taker: {$ref: '/Address'},
-        trader: {$ref: '/Address'},
-        feeRecipient: {$ref: '/Address'},
+        exchangeContractAddress: { $ref: '/Address' },
+        tokenAddress: { $ref: '/Address' },
+        makerTokenAddress: { $ref: '/Address' },
+        takerTokenAddress: { $ref: '/Address' },
+        tokenA: { $ref: '/Address' },
+        tokenB: { $ref: '/Address' },
+        maker: { $ref: '/Address' },
+        taker: { $ref: '/Address' },
+        trader: { $ref: '/Address' },
+        feeRecipient: { $ref: '/Address' },
     },
 };
diff --git a/packages/connect/src/schemas/relayer_token_pairs_request_schema.ts b/packages/connect/src/schemas/relayer_token_pairs_request_schema.ts
index 8013e1454..379232204 100644
--- a/packages/connect/src/schemas/relayer_token_pairs_request_schema.ts
+++ b/packages/connect/src/schemas/relayer_token_pairs_request_schema.ts
@@ -2,7 +2,7 @@ export const relayerTokenPairsRequestSchema = {
     id: '/RelayerTokenPairsRequest',
     type: 'object',
     properties: {
-        tokenA: {$ref: '/Address'},
-        tokenB: {$ref: '/Address'},
+        tokenA: { $ref: '/Address' },
+        tokenB: { $ref: '/Address' },
     },
 };
diff --git a/packages/connect/src/schemas/schemas.ts b/packages/connect/src/schemas/schemas.ts
index 97ac672bf..288d6969d 100644
--- a/packages/connect/src/schemas/schemas.ts
+++ b/packages/connect/src/schemas/schemas.ts
@@ -1,12 +1,6 @@
-import {
-    relayerOrderBookRequestSchema,
-} from './relayer_orderbook_request_schema';
-import {
-    relayerOrdersRequestSchema,
-} from './relayer_orders_request_schema';
-import {
-    relayerTokenPairsRequestSchema,
-} from './relayer_token_pairs_request_schema';
+import { relayerOrderBookRequestSchema } from './relayer_orderbook_request_schema';
+import { relayerOrdersRequestSchema } from './relayer_orders_request_schema';
+import { relayerTokenPairsRequestSchema } from './relayer_token_pairs_request_schema';
 
 export const schemas = {
     relayerOrderBookRequestSchema,
diff --git a/packages/connect/src/types.ts b/packages/connect/src/types.ts
index d02444a3e..edb6c77a6 100644
--- a/packages/connect/src/types.ts
+++ b/packages/connect/src/types.ts
@@ -1,4 +1,4 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 
 // TODO: Consolidate Order, SignedOrder and ECSignature into a shared package instead of duplicating them from 0x.js
 export interface Order {
@@ -57,19 +57,24 @@ export interface OrderbookChannelSubscriptionOpts {
 }
 
 export interface OrderbookChannelHandler {
-    onSnapshot: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts,
-                 snapshot: OrderbookResponse) => void;
-    onUpdate: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts,
-               order: SignedOrder) => void;
-    onError: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts,
-              err: Error) => void;
+    onSnapshot: (
+        channel: OrderbookChannel,
+        subscriptionOpts: OrderbookChannelSubscriptionOpts,
+        snapshot: OrderbookResponse,
+    ) => void;
+    onUpdate: (
+        channel: OrderbookChannel,
+        subscriptionOpts: OrderbookChannelSubscriptionOpts,
+        order: SignedOrder,
+    ) => void;
+    onError: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts, err: Error) => void;
     onClose: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts) => void;
 }
 
 export type OrderbookChannelMessage =
-    SnapshotOrderbookChannelMessage |
-    UpdateOrderbookChannelMessage |
-    UnknownOrderbookChannelMessage;
+    | SnapshotOrderbookChannelMessage
+    | UpdateOrderbookChannelMessage
+    | UnknownOrderbookChannelMessage;
 
 export enum OrderbookChannelMessageTypes {
     Snapshot = 'snapshot',
diff --git a/packages/connect/src/utils/orderbook_channel_message_parser.ts b/packages/connect/src/utils/orderbook_channel_message_parser.ts
new file mode 100644
index 000000000..9a9ca8901
--- /dev/null
+++ b/packages/connect/src/utils/orderbook_channel_message_parser.ts
@@ -0,0 +1,37 @@
+import { assert } from '@0xproject/assert';
+import { schemas } from '@0xproject/json-schemas';
+import * as _ from 'lodash';
+
+import { OrderbookChannelMessage, OrderbookChannelMessageTypes } from '../types';
+
+import { relayerResponseJsonParsers } from './relayer_response_json_parsers';
+
+export const orderbookChannelMessageParser = {
+    parse(utf8Data: string): OrderbookChannelMessage {
+        const messageObj = JSON.parse(utf8Data);
+        const type: string = _.get(messageObj, 'type');
+        assert.assert(!_.isUndefined(type), `Message is missing a type parameter: ${utf8Data}`);
+        assert.isString('type', type);
+        switch (type) {
+            case OrderbookChannelMessageTypes.Snapshot: {
+                assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelSnapshotSchema);
+                const orderbookJson = messageObj.payload;
+                const orderbook = relayerResponseJsonParsers.parseOrderbookResponseJson(orderbookJson);
+                return _.assign(messageObj, { payload: orderbook });
+            }
+            case OrderbookChannelMessageTypes.Update: {
+                assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelUpdateSchema);
+                const orderJson = messageObj.payload;
+                const order = relayerResponseJsonParsers.parseOrderJson(orderJson);
+                return _.assign(messageObj, { payload: order });
+            }
+            default: {
+                return {
+                    type: OrderbookChannelMessageTypes.Unknown,
+                    requestId: 0,
+                    payload: undefined,
+                };
+            }
+        }
+    },
+};
diff --git a/packages/connect/src/utils/orderbook_channel_message_parsers.ts b/packages/connect/src/utils/orderbook_channel_message_parsers.ts
deleted file mode 100644
index 486a416ef..000000000
--- a/packages/connect/src/utils/orderbook_channel_message_parsers.ts
+++ /dev/null
@@ -1,41 +0,0 @@
-import {assert} from '@0xproject/assert';
-import {schemas} from '@0xproject/json-schemas';
-import * as _ from 'lodash';
-
-import {
-    OrderbookChannelMessage,
-    OrderbookChannelMessageTypes,
-    SignedOrder,
-} from '../types';
-
-import {typeConverters} from './type_converters';
-
-export const orderbookChannelMessageParsers = {
-    parser(utf8Data: string): OrderbookChannelMessage {
-        const messageObj = JSON.parse(utf8Data);
-        const type: string = _.get(messageObj, 'type');
-        assert.assert(!_.isUndefined(type), `Message is missing a type parameter: ${utf8Data}`);
-        assert.isString('type', type);
-        switch (type) {
-            case (OrderbookChannelMessageTypes.Snapshot): {
-                assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelSnapshotSchema);
-                const orderbook = messageObj.payload;
-                typeConverters.convertOrderbookStringFieldsToBigNumber(orderbook);
-                return messageObj;
-            }
-            case (OrderbookChannelMessageTypes.Update): {
-                assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelUpdateSchema);
-                const order = messageObj.payload;
-                typeConverters.convertOrderStringFieldsToBigNumber(order);
-                return messageObj;
-            }
-            default: {
-                return {
-                    type: OrderbookChannelMessageTypes.Unknown,
-                    requestId: 0,
-                    payload: undefined,
-                };
-            }
-        }
-    },
-};
diff --git a/packages/connect/src/utils/relayer_response_json_parsers.ts b/packages/connect/src/utils/relayer_response_json_parsers.ts
new file mode 100644
index 000000000..668461bf4
--- /dev/null
+++ b/packages/connect/src/utils/relayer_response_json_parsers.ts
@@ -0,0 +1,37 @@
+import { assert } from '@0xproject/assert';
+import { schemas } from '@0xproject/json-schemas';
+import * as _ from 'lodash';
+
+import { FeesResponse, OrderbookResponse, SignedOrder, TokenPairsItem } from '../types';
+
+import { typeConverters } from './type_converters';
+
+export const relayerResponseJsonParsers = {
+    parseTokenPairsJson(json: any): TokenPairsItem[] {
+        assert.doesConformToSchema('tokenPairs', json, schemas.relayerApiTokenPairsResponseSchema);
+        return json.map((tokenPair: any) => {
+            return typeConverters.convertStringsFieldsToBigNumbers(tokenPair, [
+                'tokenA.minAmount',
+                'tokenA.maxAmount',
+                'tokenB.minAmount',
+                'tokenB.maxAmount',
+            ]);
+        });
+    },
+    parseOrdersJson(json: any): SignedOrder[] {
+        assert.doesConformToSchema('orders', json, schemas.signedOrdersSchema);
+        return json.map((order: object) => typeConverters.convertOrderStringFieldsToBigNumber(order));
+    },
+    parseOrderJson(json: any): SignedOrder {
+        assert.doesConformToSchema('order', json, schemas.signedOrderSchema);
+        return typeConverters.convertOrderStringFieldsToBigNumber(json);
+    },
+    parseOrderbookResponseJson(json: any): OrderbookResponse {
+        assert.doesConformToSchema('orderBook', json, schemas.relayerApiOrderBookResponseSchema);
+        return typeConverters.convertOrderbookStringFieldsToBigNumber(json);
+    },
+    parseFeesResponseJson(json: any): FeesResponse {
+        assert.doesConformToSchema('fees', json, schemas.relayerApiFeesResponseSchema);
+        return typeConverters.convertStringsFieldsToBigNumbers(json, ['makerFee', 'takerFee']);
+    },
+};
diff --git a/packages/connect/src/utils/type_converters.ts b/packages/connect/src/utils/type_converters.ts
index c136382fd..c1808ce8a 100644
--- a/packages/connect/src/utils/type_converters.ts
+++ b/packages/connect/src/utils/type_converters.ts
@@ -1,15 +1,17 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 
-// TODO: convert all of these to non-mutating, pure functions
 export const typeConverters = {
-    convertOrderbookStringFieldsToBigNumber(orderbook: object): void {
-        _.each(orderbook, (orders: object[]) => {
-            _.each(orders, (order: object) => this.convertOrderStringFieldsToBigNumber(order));
-        });
+    convertOrderbookStringFieldsToBigNumber(orderbook: any): any {
+        const bids = _.get(orderbook, 'bids', []);
+        const asks = _.get(orderbook, 'asks', []);
+        return {
+            bids: bids.map((order: any) => this.convertOrderStringFieldsToBigNumber(order)),
+            asks: asks.map((order: any) => this.convertOrderStringFieldsToBigNumber(order)),
+        };
     },
-    convertOrderStringFieldsToBigNumber(order: object): void {
-        this.convertStringsFieldsToBigNumbers(order, [
+    convertOrderStringFieldsToBigNumber(order: any): any {
+        return this.convertStringsFieldsToBigNumbers(order, [
             'makerTokenAmount',
             'takerTokenAmount',
             'makerFee',
@@ -18,14 +20,11 @@ export const typeConverters = {
             'salt',
         ]);
     },
-    convertBigNumberFieldsToStrings(obj: object, fields: string[]): void {
-        _.each(fields, field => {
-            _.update(obj, field, (value: BigNumber) => value.toString());
-        });
-    },
-    convertStringsFieldsToBigNumbers(obj: object, fields: string[]): void {
+    convertStringsFieldsToBigNumbers(obj: any, fields: string[]): any {
+        const result = _.assign({}, obj);
         _.each(fields, field => {
-            _.update(obj, field, (value: string) => new BigNumber(value));
+            _.update(result, field, (value: string) => new BigNumber(value));
         });
+        return result;
     },
 };
diff --git a/packages/connect/src/ws_orderbook_channel.ts b/packages/connect/src/ws_orderbook_channel.ts
index 6687025c0..822a022f4 100644
--- a/packages/connect/src/ws_orderbook_channel.ts
+++ b/packages/connect/src/ws_orderbook_channel.ts
@@ -1,5 +1,5 @@
-import {assert} from '@0xproject/assert';
-import {schemas} from '@0xproject/json-schemas';
+import { assert } from '@0xproject/assert';
+import { schemas } from '@0xproject/json-schemas';
 import * as _ from 'lodash';
 import * as WebSocket from 'websocket';
 
@@ -8,21 +8,20 @@ import {
     OrderbookChannelHandler,
     OrderbookChannelMessageTypes,
     OrderbookChannelSubscriptionOpts,
-    SignedOrder,
     WebsocketClientEventType,
     WebsocketConnectionEventType,
 } from './types';
-import {orderbookChannelMessageParsers} from './utils/orderbook_channel_message_parsers';
+import { orderbookChannelMessageParser } from './utils/orderbook_channel_message_parser';
 
 /**
  * This class includes all the functionality related to interacting with a websocket endpoint
  * that implements the standard relayer API v0
  */
 export class WebSocketOrderbookChannel implements OrderbookChannel {
-    private apiEndpointUrl: string;
-    private client: WebSocket.client;
-    private connectionIfExists?: WebSocket.connection;
-    private subscriptionCounter = 0;
+    private _apiEndpointUrl: string;
+    private _client: WebSocket.client;
+    private _connectionIfExists?: WebSocket.connection;
+    private _subscriptionCounter = 0;
     /**
      * Instantiates a new WebSocketOrderbookChannel instance
      * @param   url                 The relayer API base WS url you would like to interact with
@@ -30,8 +29,8 @@ export class WebSocketOrderbookChannel implements OrderbookChannel {
      */
     constructor(url: string) {
         assert.isUri('url', url);
-        this.apiEndpointUrl = url;
-        this.client = new WebSocket.client();
+        this._apiEndpointUrl = url;
+        this._client = new WebSocket.client();
     }
     /**
      * Subscribe to orderbook snapshots and updates from the websocket
@@ -42,16 +41,19 @@ export class WebSocketOrderbookChannel implements OrderbookChannel {
      */
     public subscribe(subscriptionOpts: OrderbookChannelSubscriptionOpts, handler: OrderbookChannelHandler): void {
         assert.doesConformToSchema(
-            'subscriptionOpts', subscriptionOpts, schemas.relayerApiOrderbookChannelSubscribePayload);
+            'subscriptionOpts',
+            subscriptionOpts,
+            schemas.relayerApiOrderbookChannelSubscribePayload,
+        );
         assert.isFunction('handler.onSnapshot', _.get(handler, 'onSnapshot'));
         assert.isFunction('handler.onUpdate', _.get(handler, 'onUpdate'));
         assert.isFunction('handler.onError', _.get(handler, 'onError'));
         assert.isFunction('handler.onClose', _.get(handler, 'onClose'));
-        this.subscriptionCounter += 1;
+        this._subscriptionCounter += 1;
         const subscribeMessage = {
             type: 'subscribe',
             channel: 'orderbook',
-            requestId: this.subscriptionCounter,
+            requestId: this._subscriptionCounter,
             payload: subscriptionOpts,
         };
         this._getConnection((error, connection) => {
@@ -75,44 +77,50 @@ export class WebSocketOrderbookChannel implements OrderbookChannel {
      * Close the websocket and stop receiving updates
      */
     public close() {
-        if (!_.isUndefined(this.connectionIfExists)) {
-            this.connectionIfExists.close();
+        if (!_.isUndefined(this._connectionIfExists)) {
+            this._connectionIfExists.close();
         }
     }
     private _getConnection(callback: (error?: Error, connection?: WebSocket.connection) => void) {
-        if (!_.isUndefined(this.connectionIfExists) && this.connectionIfExists.connected) {
-            callback(undefined, this.connectionIfExists);
+        if (!_.isUndefined(this._connectionIfExists) && this._connectionIfExists.connected) {
+            callback(undefined, this._connectionIfExists);
         } else {
-            this.client.on(WebsocketClientEventType.Connect, connection => {
-                this.connectionIfExists = connection;
-                callback(undefined, this.connectionIfExists);
+            this._client.on(WebsocketClientEventType.Connect, connection => {
+                this._connectionIfExists = connection;
+                callback(undefined, this._connectionIfExists);
             });
-            this.client.on(WebsocketClientEventType.ConnectFailed, error => {
+            this._client.on(WebsocketClientEventType.ConnectFailed, error => {
                 callback(error, undefined);
             });
-            this.client.connect(this.apiEndpointUrl);
+            this._client.connect(this._apiEndpointUrl);
         }
     }
-    private _handleWebSocketMessage(requestId: number, subscriptionOpts: OrderbookChannelSubscriptionOpts,
-                                    message: WebSocket.IMessage, handler: OrderbookChannelHandler): void {
+    private _handleWebSocketMessage(
+        requestId: number,
+        subscriptionOpts: OrderbookChannelSubscriptionOpts,
+        message: WebSocket.IMessage,
+        handler: OrderbookChannelHandler,
+    ): void {
         if (!_.isUndefined(message.utf8Data)) {
             try {
                 const utf8Data = message.utf8Data;
-                const parserResult = orderbookChannelMessageParsers.parser(utf8Data);
-                const type = parserResult.type;
+                const parserResult = orderbookChannelMessageParser.parse(utf8Data);
                 if (parserResult.requestId === requestId) {
                     switch (parserResult.type) {
-                        case (OrderbookChannelMessageTypes.Snapshot): {
+                        case OrderbookChannelMessageTypes.Snapshot: {
                             handler.onSnapshot(this, subscriptionOpts, parserResult.payload);
                             break;
                         }
-                        case (OrderbookChannelMessageTypes.Update): {
+                        case OrderbookChannelMessageTypes.Update: {
                             handler.onUpdate(this, subscriptionOpts, parserResult.payload);
                             break;
                         }
                         default: {
                             handler.onError(
-                                this, subscriptionOpts, new Error(`Message has missing a type parameter: ${utf8Data}`));
+                                this,
+                                subscriptionOpts,
+                                new Error(`Message has missing a type parameter: ${utf8Data}`),
+                            );
                         }
                     }
                 }
diff --git a/packages/connect/test/fixtures/standard_relayer_api/fees.ts b/packages/connect/test/fixtures/standard_relayer_api/fees.ts
index 68421880e..fecbaacff 100644
--- a/packages/connect/test/fixtures/standard_relayer_api/fees.ts
+++ b/packages/connect/test/fixtures/standard_relayer_api/fees.ts
@@ -1,6 +1,6 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 
-import {FeesResponse} from '../../../src/types';
+import { FeesResponse } from '../../../src/types';
 
 export const feesResponse: FeesResponse = {
     feeRecipient: '0x323b5d4c32345ced77393b3530b1eed0f346429d',
diff --git a/packages/connect/test/fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f.ts b/packages/connect/test/fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f.ts
index 9df45065c..5a03a2ff6 100644
--- a/packages/connect/test/fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f.ts
+++ b/packages/connect/test/fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f.ts
@@ -1,4 +1,4 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 
 export const orderResponse = {
     maker: '0x9e56625509c2f60af937f23b7b532600390e8c8b',
diff --git a/packages/connect/test/fixtures/standard_relayer_api/orderbook.json b/packages/connect/test/fixtures/standard_relayer_api/orderbook.json
index bd6e10e4c..825be34c2 100644
--- a/packages/connect/test/fixtures/standard_relayer_api/orderbook.json
+++ b/packages/connect/test/fixtures/standard_relayer_api/orderbook.json
@@ -41,4 +41,4 @@
             }
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/packages/connect/test/fixtures/standard_relayer_api/orderbook.ts b/packages/connect/test/fixtures/standard_relayer_api/orderbook.ts
index 529d2b450..6684ac2e5 100644
--- a/packages/connect/test/fixtures/standard_relayer_api/orderbook.ts
+++ b/packages/connect/test/fixtures/standard_relayer_api/orderbook.ts
@@ -1,4 +1,4 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 
 export const orderbookResponse = {
     bids: [
diff --git a/packages/connect/test/fixtures/standard_relayer_api/orders.ts b/packages/connect/test/fixtures/standard_relayer_api/orders.ts
index 54c8a150d..5044777bd 100644
--- a/packages/connect/test/fixtures/standard_relayer_api/orders.ts
+++ b/packages/connect/test/fixtures/standard_relayer_api/orders.ts
@@ -1,4 +1,4 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 
 export const ordersResponse = [
     {
diff --git a/packages/connect/test/fixtures/standard_relayer_api/token_pairs.ts b/packages/connect/test/fixtures/standard_relayer_api/token_pairs.ts
index b3ae7a1b1..f48b1e877 100644
--- a/packages/connect/test/fixtures/standard_relayer_api/token_pairs.ts
+++ b/packages/connect/test/fixtures/standard_relayer_api/token_pairs.ts
@@ -1,6 +1,6 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 
-import {TokenPairsItem} from '../../../src/types';
+import { TokenPairsItem } from '../../../src/types';
 
 export const tokenPairsResponse: TokenPairsItem[] = [
     {
diff --git a/packages/connect/test/http_client_test.ts b/packages/connect/test/http_client_test.ts
index 21e7abb69..15759d911 100644
--- a/packages/connect/test/http_client_test.ts
+++ b/packages/connect/test/http_client_test.ts
@@ -1,24 +1,21 @@
-import {BigNumber} from 'bignumber.js';
+import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import * as chaiAsPromised from 'chai-as-promised';
 import * as dirtyChai from 'dirty-chai';
 import * as fetchMock from 'fetch-mock';
 import 'mocha';
 
-import {HttpClient} from '../src/index';
+import { HttpClient } from '../src/index';
 
-import {feesResponse} from './fixtures/standard_relayer_api/fees';
+import { feesResponse } from './fixtures/standard_relayer_api/fees';
 import * as feesResponseJSON from './fixtures/standard_relayer_api/fees.json';
-import {
-    orderResponse,
-} from './fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f';
-// tslint:disable-next-line:max-line-length
+import { orderResponse } from './fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f';
 import * as orderResponseJSON from './fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f.json';
-import {orderbookResponse} from './fixtures/standard_relayer_api/orderbook';
+import { orderbookResponse } from './fixtures/standard_relayer_api/orderbook';
 import * as orderbookJSON from './fixtures/standard_relayer_api/orderbook.json';
-import {ordersResponse} from './fixtures/standard_relayer_api/orders';
+import { ordersResponse } from './fixtures/standard_relayer_api/orders';
 import * as ordersResponseJSON from './fixtures/standard_relayer_api/orders.json';
-import {tokenPairsResponse} from './fixtures/standard_relayer_api/token_pairs';
+import { tokenPairsResponse } from './fixtures/standard_relayer_api/token_pairs';
 import * as tokenPairsResponseJSON from './fixtures/standard_relayer_api/token_pairs.json';
 
 chai.config.includeStack = true;
@@ -32,14 +29,23 @@ describe('HttpClient', () => {
     afterEach(() => {
         fetchMock.restore();
     });
+    describe('#constructor', () => {
+        it('should remove trailing slashes from api url', async () => {
+            const urlWithTrailingSlash = 'https://slash.com/';
+            const urlWithoutTrailingSlash = 'https://slash.com';
+            const client = new HttpClient(urlWithTrailingSlash);
+            const sanitizedUrl = (client as any)._apiEndpointUrl;
+            expect(sanitizedUrl).to.be.deep.equal(urlWithoutTrailingSlash);
+        });
+    });
     describe('#getTokenPairsAsync', () => {
-        const url = `${relayUrl}/v0/token_pairs`;
+        const url = `${relayUrl}/token_pairs`;
         it('gets token pairs', async () => {
             fetchMock.get(url, tokenPairsResponseJSON);
             const tokenPairs = await relayerClient.getTokenPairsAsync();
             expect(tokenPairs).to.be.deep.equal(tokenPairsResponse);
         });
-        it('gets specfic token pairs for request', async () => {
+        it('gets specific token pairs for request', async () => {
             const tokenAddress = '0x323b5d4c32345ced77393b3530b1eed0f346429d';
             const tokenPairsRequest = {
                 tokenA: tokenAddress,
@@ -50,12 +56,12 @@ describe('HttpClient', () => {
             expect(tokenPairs).to.be.deep.equal(tokenPairsResponse);
         });
         it('throws an error for invalid JSON response', async () => {
-            fetchMock.get(url, {test: 'dummy'});
+            fetchMock.get(url, { test: 'dummy' });
             expect(relayerClient.getTokenPairsAsync()).to.be.rejected();
         });
     });
     describe('#getOrdersAsync', () => {
-        const url = `${relayUrl}/v0/orders`;
+        const url = `${relayUrl}/orders`;
         it('gets orders', async () => {
             fetchMock.get(url, ordersResponseJSON);
             const orders = await relayerClient.getOrdersAsync();
@@ -72,20 +78,20 @@ describe('HttpClient', () => {
             expect(orders).to.be.deep.equal(ordersResponse);
         });
         it('throws an error for invalid JSON response', async () => {
-            fetchMock.get(url, {test: 'dummy'});
+            fetchMock.get(url, { test: 'dummy' });
             expect(relayerClient.getOrdersAsync()).to.be.rejected();
         });
     });
     describe('#getOrderAsync', () => {
         const orderHash = '0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f';
-        const url = `${relayUrl}/v0/order/${orderHash}`;
+        const url = `${relayUrl}/order/${orderHash}`;
         it('gets order', async () => {
             fetchMock.get(url, orderResponseJSON);
             const order = await relayerClient.getOrderAsync(orderHash);
             expect(order).to.be.deep.equal(orderResponse);
         });
         it('throws an error for invalid JSON response', async () => {
-            fetchMock.get(url, {test: 'dummy'});
+            fetchMock.get(url, { test: 'dummy' });
             expect(relayerClient.getOrderAsync(orderHash)).to.be.rejected();
         });
     });
@@ -94,15 +100,16 @@ describe('HttpClient', () => {
             baseTokenAddress: '0x323b5d4c32345ced77393b3530b1eed0f346429d',
             quoteTokenAddress: '0xa2b31dacf30a9c50ca473337c01d8a201ae33e32',
         };
-        // tslint:disable-next-line:max-line-length
-        const url = `${relayUrl}/v0/orderbook?baseTokenAddress=${request.baseTokenAddress}&quoteTokenAddress=${request.quoteTokenAddress}`;
+        const url = `${relayUrl}/orderbook?baseTokenAddress=${request.baseTokenAddress}&quoteTokenAddress=${
+            request.quoteTokenAddress
+        }`;
         it('gets order book', async () => {
             fetchMock.get(url, orderbookJSON);
             const orderbook = await relayerClient.getOrderbookAsync(request);
             expect(orderbook).to.be.deep.equal(orderbookResponse);
         });
         it('throws an error for invalid JSON response', async () => {
-            fetchMock.get(url, {test: 'dummy'});
+            fetchMock.get(url, { test: 'dummy' });
             expect(relayerClient.getOrderbookAsync(request)).to.be.rejected();
         });
     });
@@ -118,14 +125,26 @@ describe('HttpClient', () => {
             salt: new BigNumber('256'),
             expirationUnixTimestampSec: new BigNumber('42'),
         };
-        const url = `${relayUrl}/v0/fees`;
+        const url = `${relayUrl}/fees`;
         it('gets fees', async () => {
             fetchMock.post(url, feesResponseJSON);
             const fees = await relayerClient.getFeesAsync(request);
             expect(fees).to.be.deep.equal(feesResponse);
         });
+        it('does not mutate input', async () => {
+            fetchMock.post(url, feesResponseJSON);
+            const makerTokenAmountBefore = new BigNumber(request.makerTokenAmount);
+            const takerTokenAmountBefore = new BigNumber(request.takerTokenAmount);
+            const saltBefore = new BigNumber(request.salt);
+            const expirationUnixTimestampSecBefore = new BigNumber(request.expirationUnixTimestampSec);
+            await relayerClient.getFeesAsync(request);
+            expect(makerTokenAmountBefore).to.be.deep.equal(request.makerTokenAmount);
+            expect(takerTokenAmountBefore).to.be.deep.equal(request.takerTokenAmount);
+            expect(saltBefore).to.be.deep.equal(request.salt);
+            expect(expirationUnixTimestampSecBefore).to.be.deep.equal(request.expirationUnixTimestampSec);
+        });
         it('throws an error for invalid JSON response', async () => {
-            fetchMock.post(url, {test: 'dummy'});
+            fetchMock.post(url, { test: 'dummy' });
             expect(relayerClient.getFeesAsync(request)).to.be.rejected();
         });
     });
diff --git a/packages/connect/test/orderbook_channel_message_parsers_test.ts b/packages/connect/test/orderbook_channel_message_parsers_test.ts
index 2c776b095..3e1f44384 100644
--- a/packages/connect/test/orderbook_channel_message_parsers_test.ts
+++ b/packages/connect/test/orderbook_channel_message_parsers_test.ts
@@ -2,16 +2,15 @@ import * as chai from 'chai';
 import * as dirtyChai from 'dirty-chai';
 import 'mocha';
 
-import {orderbookChannelMessageParsers} from '../src/utils/orderbook_channel_message_parsers';
+import { orderbookChannelMessageParser } from '../src/utils/orderbook_channel_message_parser';
 
-// tslint:disable-next-line:max-line-length
-import {orderResponse} from './fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f';
-import {orderbookResponse} from './fixtures/standard_relayer_api/orderbook';
+import { orderResponse } from './fixtures/standard_relayer_api/order/0xabc67323774bdbd24d94f977fa9ac94a50f016026fd13f42990861238897721f';
+import { orderbookResponse } from './fixtures/standard_relayer_api/orderbook';
 import {
     malformedSnapshotOrderbookChannelMessage,
     snapshotOrderbookChannelMessage,
 } from './fixtures/standard_relayer_api/snapshot_orderbook_channel_message';
-import {unknownOrderbookChannelMessage} from './fixtures/standard_relayer_api/unknown_orderbook_channel_message';
+import { unknownOrderbookChannelMessage } from './fixtures/standard_relayer_api/unknown_orderbook_channel_message';
 import {
     malformedUpdateOrderbookChannelMessage,
     updateOrderbookChannelMessage,
@@ -21,20 +20,20 @@ chai.config.includeStack = true;
 chai.use(dirtyChai);
 const expect = chai.expect;
 
-describe('orderbookChannelMessageParsers', () => {
+describe('orderbookChannelMessageParser', () => {
     describe('#parser', () => {
         it('parses snapshot messages', () => {
-            const snapshotMessage = orderbookChannelMessageParsers.parser(snapshotOrderbookChannelMessage);
+            const snapshotMessage = orderbookChannelMessageParser.parse(snapshotOrderbookChannelMessage);
             expect(snapshotMessage.type).to.be.equal('snapshot');
             expect(snapshotMessage.payload).to.be.deep.equal(orderbookResponse);
         });
         it('parses update messages', () => {
-            const updateMessage = orderbookChannelMessageParsers.parser(updateOrderbookChannelMessage);
+            const updateMessage = orderbookChannelMessageParser.parse(updateOrderbookChannelMessage);
             expect(updateMessage.type).to.be.equal('update');
             expect(updateMessage.payload).to.be.deep.equal(orderResponse);
         });
         it('returns unknown message for messages with unsupported types', () => {
-            const unknownMessage = orderbookChannelMessageParsers.parser(unknownOrderbookChannelMessage);
+            const unknownMessage = orderbookChannelMessageParser.parse(unknownOrderbookChannelMessage);
             expect(unknownMessage.type).to.be.equal('unknown');
             expect(unknownMessage.payload).to.be.undefined();
         });
@@ -44,7 +43,7 @@ describe('orderbookChannelMessageParsers', () => {
                 "requestId": 1,
                 "payload": {}
             }`;
-            const badCall = () => orderbookChannelMessageParsers.parser(typelessMessage);
+            const badCall = () => orderbookChannelMessageParser.parse(typelessMessage);
             expect(badCall).throws(`Message is missing a type parameter: ${typelessMessage}`);
         });
         it('throws when type is not a string', () => {
@@ -54,24 +53,23 @@ describe('orderbookChannelMessageParsers', () => {
                 "requestId": 1,
                 "payload": {}
             }`;
-            const badCall = () => orderbookChannelMessageParsers.parser(messageWithBadType);
+            const badCall = () => orderbookChannelMessageParser.parse(messageWithBadType);
             expect(badCall).throws('Expected type to be of type string, encountered: 1');
         });
         it('throws when snapshot message has malformed payload', () => {
-            const badCall = () =>
-                orderbookChannelMessageParsers.parser(malformedSnapshotOrderbookChannelMessage);
+            const badCall = () => orderbookChannelMessageParser.parse(malformedSnapshotOrderbookChannelMessage);
             // tslint:disable-next-line:max-line-length
-            const errMsg = 'Validation errors: instance.payload requires property "bids", instance.payload requires property "asks"';
+            const errMsg =
+                'Validation errors: instance.payload requires property "bids", instance.payload requires property "asks"';
             expect(badCall).throws(errMsg);
         });
         it('throws when update message has malformed payload', () => {
-            const badCall = () =>
-                orderbookChannelMessageParsers.parser(malformedUpdateOrderbookChannelMessage);
+            const badCall = () => orderbookChannelMessageParser.parse(malformedUpdateOrderbookChannelMessage);
             expect(badCall).throws(/^Expected message to conform to schema/);
         });
         it('throws when input message is not valid JSON', () => {
             const nonJsonString = 'h93b{sdfs9fsd f';
-            const badCall = () => orderbookChannelMessageParsers.parser(nonJsonString);
+            const badCall = () => orderbookChannelMessageParser.parse(nonJsonString);
             expect(badCall).throws('Unexpected token h in JSON at position 0');
         });
     });
diff --git a/packages/connect/test/ws_orderbook_channel_test.ts b/packages/connect/test/ws_orderbook_channel_test.ts
index 6190a5ac3..ce404d934 100644
--- a/packages/connect/test/ws_orderbook_channel_test.ts
+++ b/packages/connect/test/ws_orderbook_channel_test.ts
@@ -3,9 +3,7 @@ import * as dirtyChai from 'dirty-chai';
 import * as _ from 'lodash';
 import 'mocha';
 
-import {
-    WebSocketOrderbookChannel,
-} from '../src/ws_orderbook_channel';
+import { WebSocketOrderbookChannel } from '../src/ws_orderbook_channel';
 
 chai.config.includeStack = true;
 chai.use(dirtyChai);
@@ -21,26 +19,42 @@ describe('WebSocketOrderbookChannel', () => {
         limit: 100,
     };
     const emptyOrderbookChannelHandler = {
-        onSnapshot: () => { _.noop(); },
-        onUpdate: () => { _.noop(); },
-        onError: () => { _.noop(); },
-        onClose: () => { _.noop(); },
+        onSnapshot: () => {
+            _.noop();
+        },
+        onUpdate: () => {
+            _.noop();
+        },
+        onError: () => {
+            _.noop();
+        },
+        onClose: () => {
+            _.noop();
+        },
     };
     describe('#subscribe', () => {
         it('throws when subscriptionOpts does not conform to schema', () => {
             const badSubscribeCall = orderbookChannel.subscribe.bind(
-                orderbookChannel, {}, emptyOrderbookChannelHandler);
-            // tslint:disable-next-line:max-line-length
-            expect(badSubscribeCall).throws('Expected subscriptionOpts to conform to schema /RelayerApiOrderbookChannelSubscribePayload\nEncountered: {}\nValidation errors: instance requires property "baseTokenAddress", instance requires property "quoteTokenAddress"');
+                orderbookChannel,
+                {},
+                emptyOrderbookChannelHandler,
+            );
+            expect(badSubscribeCall).throws(
+                'Expected subscriptionOpts to conform to schema /RelayerApiOrderbookChannelSubscribePayload\nEncountered: {}\nValidation errors: instance requires property "baseTokenAddress", instance requires property "quoteTokenAddress"',
+            );
         });
         it('throws when handler has the incorrect members', () => {
             const badSubscribeCall = orderbookChannel.subscribe.bind(orderbookChannel, subscriptionOpts, {});
-            expect(badSubscribeCall)
-                .throws('Expected handler.onSnapshot to be of type function, encountered: undefined');
+            expect(badSubscribeCall).throws(
+                'Expected handler.onSnapshot to be of type function, encountered: undefined',
+            );
         });
         it('does not throw when inputs are of correct types', () => {
             const goodSubscribeCall = orderbookChannel.subscribe.bind(
-                orderbookChannel, subscriptionOpts, emptyOrderbookChannelHandler);
+                orderbookChannel,
+                subscriptionOpts,
+                emptyOrderbookChannelHandler,
+            );
             expect(goodSubscribeCall).to.not.throw();
         });
     });
diff --git a/packages/connect/tsconfig.json b/packages/connect/tsconfig.json
index a6c8277f8..3c150236e 100644
--- a/packages/connect/tsconfig.json
+++ b/packages/connect/tsconfig.json
@@ -1,19 +1,12 @@
 {
+    "extends": "../../tsconfig",
     "compilerOptions": {
-      "module": "commonjs",
-      "target": "es5",
-      "lib": [ "es2015", "dom" ],
-      "outDir": "lib",
-      "sourceMap": true,
-      "declaration": true,
-      "noImplicitAny": true,
-      "strictNullChecks": true
+        "outDir": "lib"
     },
     "include": [
-      "./src/**/*",
-      "./test/**/*",
-      "../../node_modules/chai-as-promised-typescript-typings/index.d.ts",
-      "../../node_modules/chai-typescript-typings/index.d.ts",
-      "../../node_modules/web3-typescript-typings/index.d.ts"
+        "./src/**/*",
+        "./test/**/*",
+        "../../node_modules/chai-as-promised-typescript-typings/index.d.ts",
+        "../../node_modules/chai-typescript-typings/index.d.ts"
     ]
-  }
+}
diff --git a/packages/connect/tslint.json b/packages/connect/tslint.json
index a07795151..ffaefe83a 100644
--- a/packages/connect/tslint.json
+++ b/packages/connect/tslint.json
@@ -1,5 +1,3 @@
 {
-  "extends": [
-    "@0xproject/tslint-config"
-  ]
+    "extends": ["@0xproject/tslint-config"]
 }