3 files changed, 12 insertions, 0 deletions
diff --git a/src/0x.ts b/src/0x.ts
index 7fe6331c1..ba222f2c9 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -163,6 +163,13 @@ export class ZeroEx {
      * @return  An instance of the 0x.js ZeroEx class.
      */
     constructor(provider: Web3Provider, config?: ZeroExConfig) {
+        assert.isWeb3Provider('provider', provider);
+        if (_.isUndefined((provider as any).sendAsync)) {
+            // Web3@1.0 provider doesn't support synchronous http requests,
+            // so it only has an async `send` method, instead of a `send` and `sendAsync` in web3@0.x.x`
+            // We re-assign the send method so that Web3@1.0 providers work with 0x.js
+            (provider as any).sendAsync = (provider as any).send;
+        }
         this._web3Wrapper = new Web3Wrapper(provider);
         const gasPrice = _.isUndefined(config) ? undefined : config.gasPrice;
         this.token = new TokenWrapper(this._web3Wrapper, gasPrice);
diff --git a/src/globals.d.ts b/src/globals.d.ts
index 1ef70d679..9230ab02d 100644
--- a/src/globals.d.ts
+++ b/src/globals.d.ts
@@ -1,5 +1,6 @@
 /// <reference types='chai-typescript-typings' />
 /// <reference types='chai-as-promised-typescript-typings' />
+declare module 'web3_beta';
 declare module 'chai-bignumber';
 declare module 'dirty-chai';
 declare module 'request-promise-native';
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index a26b19311..eb084129c 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -61,6 +61,10 @@ export const assert = {
     isBoolean(variableName: string, value: boolean): void {
         this.assert(_.isBoolean(value), this.typeAssertionMessage(variableName, 'boolean', value));
     },
+    isWeb3Provider(variableName: string, value: Web3.Provider): void {
+        const isWeb3Provider = _.isFunction((value as any).send) || _.isFunction((value as any).sendAsync);
+        this.assert(isWeb3Provider, this.typeAssertionMessage(variableName, 'Web3.Provider', value));
+    },
     doesConformToSchema(variableName: string, value: any, schema: Schema): void {
         const schemaValidator = new SchemaValidator();
         const validationResult = schemaValidator.validate(value, schema);