eBay Browse API vs Walmart Affiliate API for AI agents
eBay Browse API is eBay's Buy API for searching live eBay listings by keyword or category and fetching item details. Walmart Affiliate API is Walmart I/O's set of REST services for affiliates to search Walmart.com products and earn referral fees.
The short answer
- eBay Browse API: Approved eBay partners who want live new and used eBay listings with affiliate tracking.
- Walmart Affiliate API: Affiliate publishers in the Impact network who want live Walmart.com prices and availability with tracked links.
Side by side
| eBay Browse API | Walmart Affiliate API | |
|---|---|---|
| Searches | Live eBay listings by keyword and category (plus image search in some markets), and item details by item ID. | Text search of the Walmart.com catalogue for items sold online, item lookup by item ID or UPC, taxonomy, reviews, trending items and recommendations; several categories are excluded. |
| Returns | A subset of item details per search hit (more with the EXTENDED field group); full details come from getItem using the item ID. | Item data including real-time price and availability; a responseGroup parameter sets which item fields come back. |
| Before the first call | An eBay developer account (sandbox is open to anyone); production use of the Buy APIs is for eBay partners and needs an application through the eBay Partner Network, approved by business model. | A Walmart.com account to log in to walmart.io, a registered application with an uploaded public key (which creates a consumer ID), and an Impact Radius publisher ID passed on calls. |
| Acting on a result | Affiliate links through the eBay Partner Network (production apps must implement affiliate tracking); eBay member checkout via the separate checkout_session resource needs extra approval. | Affiliate links: calls carry your Impact Radius publisher ID and you earn referral fees when shoppers buy on Walmart.com. |
| Coverage | 16 eBay marketplaces: AT, AU, BE, CA, CH, DE, ES, FR, GB, HK, IE, IT, NL, PL, SG and US (image search only in US, DE, UK and AU). | Walmart.com (United States). |
| MCP server | No official server listed | No official server listed |
Where Openpath fits
Openpath has no products listed yet. Sellers can list a product on Openpath today, free, and agents will find it through the same search as jobs and businesses. Get listed.
Questions people ask
What do I need before I can use eBay Browse API?
An eBay developer account (sandbox is open to anyone); production use of the Buy APIs is for eBay partners and needs an application through the eBay Partner Network, approved by business model.
Is eBay Browse API free?
Its pages listed no free use when we read them on October 15, 2026.
What do I need before I can use Walmart Affiliate API?
A Walmart.com account to log in to walmart.io, a registered application with an uploaded public key (which creates a consumer ID), and an Impact Radius publisher ID passed on calls.
Is Walmart Affiliate API free?
Its pages listed no free use when we read them on October 15, 2026.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
eBay Browse API, read on October 15, 2026:
- developer.ebay.com/api-docs/buy/static/api-browse.html: “Using the Browse API, you can create a rich selection of items for your buyers to browse with keyword and category searches.”
- developer.ebay.com/api-docs/buy/static/api-browse.html: “For each item found, a subset of the item details is returned.”
- developer.ebay.com/api-docs/buy/static/buy-requirements.html: “The use of eBay’s Buy APIs in production is intended for eBay partners only.”
- developer.ebay.com/api-docs/buy/static/buy-requirements.html: “You must apply for production access through the eBay Partner Network.”
- developer.ebay.com/api-docs/buy/static/buy-requirements.html: “Acceptance of applications is based on the proposed business model”
- developer.ebay.com/api-docs/buy/static/buy-requirements.html: “Application must implement affiliate tracking details (needed for revenue share capability)”
- developer.ebay.com/api-docs/buy/static/buy-requirements.html: “To use the checkout_session resource, which supports eBay member checkout, you need approval.”
Walmart Affiliate API, read on October 15, 2026:
- walmart.io/apidocs/affiliates/introduction: “a useful collection of RESTful services that allow developers to earn referral fees”
- walmart.io/apidocs/affiliates/introduction: “Several categories are excluded from the API calls.”
- walmart.io/apidocs/affiliates/affiliate-marketing-api: “Perform text search on the Walmart.com catalogue and get matching items available for sale online.”
- walmart.io/apidocs/affiliates/affiliate-marketing-api: “Get real time item status including price and availability”
- walmart.io/apidocs/affiliates/affiliate-marketing-api: “Your Impact Radius Publisher Id”
- walmart.io/apidocs/affiliates/quickstart: “After the public key is uploaded, consumer id will be created for your application.”