1 files changed, 6 insertions, 1 deletions
diff --git a/packages/asset-buyer/src/utils/assert.ts b/packages/asset-buyer/src/utils/assert.ts
index c4d611477..0085ca41e 100644
--- a/packages/asset-buyer/src/utils/assert.ts
+++ b/packages/asset-buyer/src/utils/assert.ts
@@ -2,7 +2,7 @@ import { assert as sharedAssert } from '@0xproject/assert';
 import { schemas } from '@0xproject/json-schemas';
 import * as _ from 'lodash';
 
-import { BuyQuote, OrderFetcher } from '../types';
+import { BuyQuote, OrderFetcher, OrderFetcherRequest } from '../types';
 
 export const assert = {
     ...sharedAssert,
@@ -20,4 +20,9 @@ export const assert = {
     isValidOrderFetcher(variableName: string, orderFetcher: OrderFetcher): void {
         sharedAssert.isFunction(`${variableName}.fetchOrdersAsync`, orderFetcher.fetchOrdersAsync);
     },
+    isValidOrderFetcherRequest(variableName: string, orderFetcherRequest: OrderFetcherRequest): void {
+        sharedAssert.isHexString(`${variableName}.makerAssetData`, orderFetcherRequest.makerAssetData);
+        sharedAssert.isHexString(`${variableName}.takerAssetData`, orderFetcherRequest.takerAssetData);
+        sharedAssert.isNumber(`${variableName}.networkId`, orderFetcherRequest.networkId);
+    },
 };