diff --git a/src/CBExchangeClient.ts b/src/CBExchangeClient.ts
index 336281d..ffadf27 100644
--- a/src/CBExchangeClient.ts
+++ b/src/CBExchangeClient.ts
@@ -413,6 +413,7 @@ export class CBExchangeClient extends BaseRestClient {
    * Once an order is placed, your account funds will be put on hold for the duration of the order.
    */
   submitOrder(params: SubmitCBExchOrderRequest): Promise<any> {
+    this.validateOrderId(params, 'client_oid');
     return this.postPrivate('/orders', { body: params });
   }
 
diff --git a/src/CBInternationalClient.ts b/src/CBInternationalClient.ts
index a2c4b98..36e37d6 100644
--- a/src/CBInternationalClient.ts
+++ b/src/CBInternationalClient.ts
@@ -166,6 +166,7 @@ export class CBInternationalClient extends BaseRestClient {
    * Creates a new order.
    */
   submitOrder(params: SubmitINTXOrderRequest): Promise<any> {
+    this.validateOrderId(params, 'client_order_id');
     return this.postPrivate('/api/v1/orders', { body: params });
   }
 
diff --git a/src/CBPrimeClient.ts b/src/CBPrimeClient.ts
index 083c49a..47c33a6 100644
--- a/src/CBPrimeClient.ts
+++ b/src/CBPrimeClient.ts
@@ -393,6 +393,7 @@ export class CBPrimeClient extends BaseRestClient {
    * Create an order for a given portfolio.
    */
   submitOrder(params: SubmitPrimeOrderRequest): Promise<any> {
+    this.validateOrderId(params, 'client_order_id');
     const { portfolio_id, ...body } = params;
     return this.postPrivate(`/v1/portfolios/${portfolio_id}/order`, {
       body: body,
diff --git a/src/lib/BaseRestClient.ts b/src/lib/BaseRestClient.ts
index 3777c37..988e4a8 100644
--- a/src/lib/BaseRestClient.ts
+++ b/src/lib/BaseRestClient.ts
@@ -7,6 +7,9 @@ import {
   CloseAdvTradePositionRequest,
   SubmitAdvTradeOrderRequest,
 } from '../types/request/advanced-trade-client.js';
+import { SubmitCBExchOrderRequest } from '../types/request/coinbase-exchange.js';
+import { SubmitINTXOrderRequest } from '../types/request/coinbase-international.js';
+import { SubmitPrimeOrderRequest } from '../types/request/coinbase-prime.js';
 import { CustomOrderIdProperty } from '../types/shared.types.js';
 import { signJWT } from './jwtNode.js';
 import { neverGuard } from './misc-util.js';
@@ -264,31 +267,39 @@ export abstract class BaseRestClient {
   }
 
   public generateNewOrderId(): string {
-    return APIIDPrefix + nanoid(30);
+    return APIIDPrefix + nanoid(14);
   }
 
   /**
-   * Validate syntax meets requirements set by binance. Log warning if not.
+   * Validate syntax meets requirements set by coinbase. Log warning if not.
    */
   protected validateOrderId(
-    params: SubmitAdvTradeOrderRequest | CloseAdvTradePositionRequest,
+    params:
+      | SubmitAdvTradeOrderRequest
+      | CloseAdvTradePositionRequest
+      | SubmitCBExchOrderRequest
+      | SubmitINTXOrderRequest
+      | SubmitPrimeOrderRequest,
     orderIdProperty: CustomOrderIdProperty,
   ): void {
-    if (!params[orderIdProperty]) {
-      params[orderIdProperty] = this.generateNewOrderId();
+    // Not the cleanest but strict checks aren't quite necessary here either
+    const requestParams = params as any;
+
+    if (!requestParams[orderIdProperty]) {
+      requestParams[orderIdProperty] = this.generateNewOrderId();
       return;
     }
 
-    if (!params[orderIdProperty].startsWith(APIIDPrefix)) {
+    if (!requestParams[orderIdProperty].startsWith(APIIDPrefix)) {
       logInvalidOrderId(orderIdProperty, APIIDPrefix, params);
 
-      const previousValue = params[orderIdProperty];
-      const newValue = APIIDPrefix + params[orderIdProperty];
+      const previousValue = requestParams[orderIdProperty];
+      const newValue = APIIDPrefix + requestParams[orderIdProperty];
       console.warn(
         `WARNING: "${orderIdProperty}" was automatically prefixed. Changed from "${previousValue}" to "${newValue}". To avoid this, apply the prefix before submitting an order or use the client.generateNewOrderId() utility method.`,
       );
 
-      params[orderIdProperty] = newValue;
+      requestParams[orderIdProperty] = newValue;
     }
   }
 
diff --git a/src/types/request/coinbase-international.ts b/src/types/request/coinbase-international.ts
index 967cad7..5a43d0d 100644
--- a/src/types/request/coinbase-international.ts
+++ b/src/types/request/coinbase-international.ts
@@ -37,7 +37,7 @@ export interface GetINTXAggregatedCandlesData {
  */
 
 export interface SubmitINTXOrderRequest {
-  client_order_id: string;
+  client_order_id?: string;
   side: string;
   size: string;
   tif: string;
diff --git a/src/types/request/coinbase-prime.ts b/src/types/request/coinbase-prime.ts
index 7822a8d..6e1cbcc 100644
--- a/src/types/request/coinbase-prime.ts
+++ b/src/types/request/coinbase-prime.ts
@@ -172,7 +172,7 @@ export interface SubmitPrimeOrderRequest {
   portfolio_id: string;
   product_id: string;
   side: 'BUY' | 'SELL';
-  client_order_id: string;
+  client_order_id?: string;
   type?: 'MARKET' | 'LIMIT' | 'TWAP' | 'VWAP' | 'STOP_LIMIT';
   base_quantity?: string;
   quote_value?: string;
diff --git a/src/types/shared.types.ts b/src/types/shared.types.ts
index 86bf6bc..3f96b83 100644
--- a/src/types/shared.types.ts
+++ b/src/types/shared.types.ts
@@ -68,4 +68,4 @@ export interface OrderConfiguration {
   trigger_bracket_gtd?: TriggerBracketGTD;
 }
 
-export type CustomOrderIdProperty = 'client_order_id';
+export type CustomOrderIdProperty = 'client_order_id' | 'client_oid';