From d4662f428ac46363bc43bb9c32837f8b23a88ef7 Mon Sep 17 00:00:00 2001
From: Steve Klebanoff <steve@0xproject.com>
Date: Fri, 19 Jun 2020 13:29:19 -0700
Subject: [PATCH] change BNs to strings

---
 .../asset-swapper/src/utils/quote_requestor.ts     | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/packages/asset-swapper/src/utils/quote_requestor.ts b/packages/asset-swapper/src/utils/quote_requestor.ts
index 947d475bee..455b1b8ea3 100644
--- a/packages/asset-swapper/src/utils/quote_requestor.ts
+++ b/packages/asset-swapper/src/utils/quote_requestor.ts
@@ -284,10 +284,22 @@ export class QuoteRequestor {
         const responsesIfDefined: Array<undefined | AxiosResponse<ResponseT>> = await Promise.all(
             Object.keys(this._rfqtAssetOfferings).map(async url => {
                 if (this._makerSupportsPair(url, makerAssetData, takerAssetData)) {
-                    const requestParams = {
+                    const requestParamsWithBigNumbers = {
                         takerAddress: options.takerAddress,
                         ...inferQueryParams(marketOperation, makerAssetData, takerAssetData, assetFillAmount),
                     };
+
+                    // convert BigNumbers to strings
+                    const requestParams = {
+                        ...requestParamsWithBigNumbers,
+                        sellAmountBaseUnits: requestParamsWithBigNumbers.sellAmountBaseUnits
+                            ? requestParamsWithBigNumbers.sellAmountBaseUnits.toString()
+                            : undefined,
+                        buyAmountBaseUnits: requestParamsWithBigNumbers.buyAmountBaseUnits
+                            ? requestParamsWithBigNumbers.buyAmountBaseUnits.toString()
+                            : undefined,
+                    };
+
                     const partialLogEntry = { url, quoteType, requestParams };
                     const timeBeforeAwait = Date.now();
                     try {