UNITED STATES Marketplace Partners
Unlock the power of Marketplace APIs to manage items, orders, pricing, and so much more.
Action required: The ability for approved Solution Providers to create new Delegated Access keys was retired on July 30, 2026. Existing Delegated Access keys will continue to work until the end of April 30, 2027.
Sellers: Connect directly with your Solution Provider through the Walmart App Store to ensure uninterrupted service.
Approved Solution Providers: Migrate your sellers to OAuth 2.0 by instructing them to reauthorize their app connections using the Connect button in the Walmart App Store.
Start integrating today
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Popular APIs to help you get started
From managing items to tracking fulfillment — explore our most popular endpoints.
Items
Create and manage item listings on Walmart.com.
Inventory
Keep your item inventory up-to-date.
Promotions
Set promotional item prices for events such as clearance sales or call out comparison prices
Ship with Walmart
Ship with Walmart (SWW) enables sellers to buy shipping at discounted rates directly from Walmart to ship their goods to U.S. customers.
Track your progress
Use testing environments and real-time API status updates to build solutions that last.
What's new?
The latest platform updates — here to help you build with confidence.
September 28, 2026
New: MCS webhooks for order and return updates Walmart Multichannel Solutions (MCS) now supports webhooks for real-time order, shipment, and return updates.
September 21, 2026
Update: Order Management APIs error examples for label shipping The Orders Ship Order Lines API Reference Guide has been updated with new Cross Border Trade (CBT) and Out of Country shipment error information for Ship With Walmart labels shipping.
September 15, 2026
New: Item spec 5.0 version Item setup spec 5.0.20260803-17_50_56-api is now available for MP_ITEM, MP_MAINTENANCE, MP_WFS_ITEM, and OMNI_WFS with specs and diff reports in the Item spec reporting and version table.
September 11, 2026
Update: More KPIs for Seller performance reports Performance webhook reports are expanding with additional seller performance KPIs to support more comprehensive monitoring.