diff --git a/src/client.ts b/src/client.ts
index d311b703..ad7864af 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1316,8 +1316,9 @@ export class ClobClient {
         side: Side,
         amount: number,
         orderType: OrderType = OrderType.FOK,
+        orderBook?: OrderBookSummary
     ): Promise<number> {
-        const book = await this.getOrderBook(tokenID);
+        const book = orderBook ?? await this.getOrderBook(tokenID);
         if (!book) {
             throw new Error("no orderbook");
         }