Walmart Affiliate API vs PayPal MCP server for AI agents
Walmart Affiliate API is Walmart I/O's set of REST services for affiliates to search Walmart.com products and earn referral fees. PayPal MCP server is PayPal's remote MCP server, whose commerce tools let an agent search a PayPal product catalog, build a cart and check out with PayPal, for gift cards only today.
The short answer
- Walmart Affiliate API: Affiliate publishers in the Impact network who want live Walmart.com prices and availability with tracked links.
- PayPal MCP server: Agents that need to buy gift cards end to end with PayPal payment.
Side by side
| Walmart Affiliate API | PayPal MCP server | |
|---|---|---|
| Searches | 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. | Gift card products in the PayPal catalog only. |
| Returns | Item data including real-time price and availability; a responseGroup parameter sets which item fields come back. | Product information including pricing, availability and purchase options. |
| Before the first call | 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. | PayPal client credentials from the PayPal Developer Dashboard, a PayPal login when the MCP client first connects, and the header x-feature-flags: commerce:true to show the commerce tools. |
| Acting on a result | Affiliate links: calls carry your Impact Radius publisher ID and you earn referral fees when shoppers buy on Walmart.com. | Checkout through the API: create_cart and checkout_cart complete the purchase and pay with PayPal. |
| Coverage | Walmart.com (United States). | Not stated on its pages |
| MCP server | No official server listed | Official remote MCP server at https://mcp.paypal.com (paths /sse or /http; sandbox at https://mcp.sandbox.paypal.com). |
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 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.
What do I need before I can use PayPal MCP server?
PayPal client credentials from the PayPal Developer Dashboard, a PayPal login when the MCP client first connects, and the header x-feature-flags: commerce:true to show the commerce tools.
Is PayPal MCP server 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.
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.”
PayPal MCP server, read on October 15, 2026:
- developer.paypal.com/ai-tools/agent-tools: “Find gift card products in the PayPal catalog.”
- developer.paypal.com/ai-tools/agent-tools: “These tools are for gift cards only for now, but more is coming soon.”
- developer.paypal.com/ai-tools/agent-tools: “It returns product information that includes pricing, availability, and purchase options.”
- developer.paypal.com/ai-tools/agent-tools: “This tool processes the final checkout for a configured shopping cart using PayPal for payment.”
- developer.paypal.com/ai-tools/agent-tools: “x-feature-flags: commerce:true”
- developer.paypal.com/tools/mcp-server: “PayPal supports using your PayPal client credentials to connect to the remote MCP server.”
- developer.paypal.com/tools/mcp-server: “The MCP client sends you to the PayPal login page.”