Walmart Marketplace is an eCommerce platform operated by Walmart that enables third-party sellers to list and sell products directly on Walmart.com, reaching millions of customers across the U.S. Marketplace supports a wide range of sellers, from small and medium businesses to large brands, offering the infrastructure needed to manage listings, orders, fulfillment, and post-purchase experiences at scale.

The Walmart Marketplace APIs provide programmatic access for sellers and approved solution providers to integrate directly with Marketplace systems. These APIs enable you to manage key aspects of your business on Walmart.com, including items, inventory, orders, pricing, promotions, reporting, and other operational workflows. By integrating with the Marketplace APIs, you can automate processes, reduce manual effort, and build custom tools or platform integrations that support your business needs.

The Walmart Developer Portal serves as the central hub for Marketplace API integration. It provides access to API documentation, credentials, authentication guidance, and onboarding resources needed to build, test, and maintain integrations with Walmart Marketplace.

If you are new to Walmart Marketplace, start by reviewing the basic eligibility requirements and onboarding steps in the Getting Started guide. The guide walks you through account setup, API access, and initial integration, helping you move from registration to selling on Walmart.com. Whether you are an independent seller or an established brand, these resources are designed to help you successfully launch and scale your Marketplace business.

Prerequisites

Before calling the Walmart Marketplace APIs, complete the following setup steps.

API Credentials

You must generate API keys (Client ID and Client Secret) from the Walmart Developer Portal. These credentials are required to authenticate requests and obtain access tokens for Marketplace APIs.

Authentication & Authorization

All Walmart Marketplace APIs use OAuth 2.0 for authentication.

• Token Requirement: You must obtain an OAuth 2.0 access token before making API requests.
• Expiration: Access tokens are valid for 15 minutes. Your integration must handle the expires_in field and refresh or re-generate tokens as needed to maintain access.

Learn more

Use the following resources to start selling on Walmart Marketplace using the Marketplace APIs.

• Get an access token using Token API - Details how to use the Token API endpoint to obtain OAuth 2.0 access tokens for Walmart Marketplace APIs. Retrieving access tokens is essential to start integrating with Marketplace APIs.
• Get started as a seller - Provides information on how to register as a seller and provides options on how you can access the Marketplace APIs. You can either choose to directly integrate with the APIs or leverage authorized connections with approved solution providers.
• Get started as a solution provider - Provides information on how companies can be approved Solution Providers to develop software that could improve sellers’ eCommerce workflows.
• Integrate with Walmart Marketplace APIs - Provides information on available integration guides that show you how to use the Marketplace APIs and provides API integration options.
• OAuth 2.0 authorization - Learn more about the Walmart Marketplace app store authorization workflow. Walmart incorporates an industry-standard OAuth 2.0 token-based authorization and authentication.