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.
September 08, 2026
New: Sandbox Pricing and Promo Simulations Walmart Marketplace now supports dynamic sandbox capabilities to selected Pricing and Promotions APIs.
September 02, 2026
Update: Fitment automotive updates Learn what’s changing for automotive item setup, vehicle compatibility, and fitment reporting.
August 31, 2026
New: Pre-shipment tracking for WFS Multichannel orders WFS Multichannel Solutions (MCS) orders now include a Walmart Fulfillment Tracking Number (WTRN) when an order is created, before carrier pickup.
August 31, 2026
New: Item spec 5.0 version Item setup spec 5.0.20260703-18_22_27-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.