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 September 2026.
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
Build faster and smarter with our API integration guides.
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.
August 20, 2026
Update: Ship With Walmart API shipping estimate date fields Walmart has updated the Ship with Walmart Shipping estimate API documentation to clarify the requirements and usage of the shipByDate and deliverByDate parameters.
August 20, 2026
Update: EAN and ISBN item search support Search the Walmart catalog by EAN or ISBN in the US market, and learn about the latest MP_ITEM_MATCH SFF 5.x support changes. Read the full launch post for details, migration guidance, and next steps.
August 5, 2026
Update: Expanded fulfillment center and international template support for Settings Management APIs The Settings Management API has been updated to support fulfillment center setup and edits in more countries.
August 4, 2026
Deprecation: Simplified Shipping Settings APIs The Simplified Shipping Settings endpoints will be deprecated on August 4, 2026.