diff --git a/packages/contract-wrappers/src/contract_wrappers.ts b/packages/contract-wrappers/src/contract_wrappers.ts
index 7be422febd..f43ed2a5b3 100644
--- a/packages/contract-wrappers/src/contract_wrappers.ts
+++ b/packages/contract-wrappers/src/contract_wrappers.ts
@@ -9,9 +9,9 @@ import {
     OrderValidator,
     WETH9,
 } from '@0x/contract-artifacts';
-import { AbiDecoder, providerUtils } from '@0x/utils';
+import { AbiDecoder } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
-import { Provider, SupportedProvider } from 'ethereum-types';
+import { SupportedProvider } from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { DutchAuctionWrapper } from './contract_wrappers/dutch_auction_wrapper';
diff --git a/packages/fill-scenarios/src/fill_scenarios.ts b/packages/fill-scenarios/src/fill_scenarios.ts
index 8a0d6fef9e..2bdb8a19a1 100644
--- a/packages/fill-scenarios/src/fill_scenarios.ts
+++ b/packages/fill-scenarios/src/fill_scenarios.ts
@@ -3,7 +3,7 @@ import * as artifacts from '@0x/contract-artifacts';
 import { assetDataUtils } from '@0x/order-utils';
 import { orderFactory } from '@0x/order-utils/lib/src/order_factory';
 import { OrderWithoutExchangeAddress, SignedOrder } from '@0x/types';
-import { BigNumber, providerUtils } from '@0x/utils';
+import { BigNumber } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
 import { SupportedProvider } from 'ethereum-types';
 import * as _ from 'lodash';
diff --git a/packages/instant/src/index.umd.ts b/packages/instant/src/index.umd.ts
index 5c9c42bd6f..30f33acdf8 100644
--- a/packages/instant/src/index.umd.ts
+++ b/packages/instant/src/index.umd.ts
@@ -24,7 +24,7 @@ import { util } from './util/util';
 
 const isInstantRendered = (): boolean => !!document.getElementById(INJECTED_DIV_ID);
 
-const validateInstantRenderConfigAsync = async (config: ZeroExInstantConfig, selector: string) => {
+const validateInstantRenderConfig = (config: ZeroExInstantConfig, selector: string) => {
     assert.isValidOrderSource('orderSource', config.orderSource);
     if (!_.isUndefined(config.defaultSelectedAssetData)) {
         assert.isHexString('defaultSelectedAssetData', config.defaultSelectedAssetData);
@@ -102,7 +102,7 @@ export const render = (config: ZeroExInstantConfig, selector: string = DEFAULT_Z
             : config.orderSource,
     });
 
-    validateInstantRenderConfigAsync(coercedConfig, selector);
+    validateInstantRenderConfig(coercedConfig, selector);
 
     if (coercedConfig.shouldDisablePushToHistory) {
         if (!isInstantRendered()) {
diff --git a/packages/instant/src/util/provider_factory.ts b/packages/instant/src/util/provider_factory.ts
index 1b66a9b7a7..5af235d044 100644
--- a/packages/instant/src/util/provider_factory.ts
+++ b/packages/instant/src/util/provider_factory.ts
@@ -1,6 +1,6 @@
 import { EmptyWalletSubprovider, RPCSubprovider, Web3ProviderEngine } from '@0x/subproviders';
 import { providerUtils } from '@0x/utils';
-import { SupportedProvider, ZeroExProvider } from 'ethereum-types';
+import { ZeroExProvider } from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { BLOCK_POLLING_INTERVAL_MS, ETHEREUM_NODE_URL_BY_NETWORK } from '../constants';
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
index 57b56099b8..8a5fb711c8 100644
--- a/packages/order-utils/src/signature_utils.ts
+++ b/packages/order-utils/src/signature_utils.ts
@@ -5,7 +5,7 @@ import { schemas } from '@0x/json-schemas';
 import { ECSignature, Order, SignatureType, SignedOrder, ValidatorSignature } from '@0x/types';
 import { providerUtils } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
-import { Provider, SupportedProvider } from 'ethereum-types';
+import { SupportedProvider } from 'ethereum-types';
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 
diff --git a/packages/utils/src/provider_utils.ts b/packages/utils/src/provider_utils.ts
index c9a00f6337..19ef0725e7 100644
--- a/packages/utils/src/provider_utils.ts
+++ b/packages/utils/src/provider_utils.ts
@@ -24,17 +24,19 @@ export const providerUtils = {
             isParity: (supportedProvider as any).isParity,
             stop: (supportedProvider as any).stop,
             enable: (supportedProvider as any).enable,
-            sendAsync: _.noop, // Will be replaced
+            sendAsync: _.noop.bind(_), // Will be replaced
         };
         // Case 1: We've already converted to our ZeroExProvider so noop.
         if ((supportedProvider as any).isStandardizedProvider) {
+            // tslint:disable-next-line:no-unnecessary-type-assertion
             return supportedProvider as ZeroExProvider;
             // Case 2: It's a compliant EIP 1193 Provider
+            // tslint:disable-next-line:no-unnecessary-type-assertion
         } else if ((supportedProvider as EIP1193Provider).isEIP1193) {
             provider.sendAsync = (payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback) => {
                 const method = payload.method;
                 const params = payload.params;
-                (supportedProvider as EIP1193Provider)
+                (supportedProvider as any)
                     .send(method, params)
                     .then((result: any) => {
                         callback(null, result);
diff --git a/packages/web3-wrapper/src/web3_wrapper.ts b/packages/web3-wrapper/src/web3_wrapper.ts
index b2694556b4..da6de7537c 100644
--- a/packages/web3-wrapper/src/web3_wrapper.ts
+++ b/packages/web3-wrapper/src/web3_wrapper.ts
@@ -54,7 +54,7 @@ export class Web3Wrapper {
     public abiDecoder: AbiDecoder;
     private _provider: ZeroExProvider;
     // Raw provider passed in. Do not use. Only here to return the unmodified provider passed in via `getProvider()`
-    private _supportedProvider: SupportedProvider;
+    private readonly _supportedProvider: SupportedProvider;
     private readonly _txDefaults: Partial<TxData>;
     private _jsonRpcRequestId: number;
     /**