 Gift cards, phone top-ups, and eSIMs bought over an eCommerce MCP server, payable with x402 or L402 — no account, no card on file MCPOpenAPIllms.txt | gift-cards+5 | MCP+2 | L402+1 | wallet, Merchants | 5/5 | | |
 Storefront, Customer Account, Checkout, and Dev MCP servers plus ACP and UCP support across millions of merchants MCPOpenAPIllms.txt | commerce+5 | MCP+2 | ACP+2 | m2m-oauth, Merchants | 5/5 | | |
 Open-source scheduling with a documented API for availability lookups and booking meetings llms.txt | scheduling+3 | llms.txt | — | api-key, Merchants | 4/5 | | |
 Send physical mail and postcards over an API, payable per item over MPP OpenAPIllms.txt | mail+3 | OpenAPI+1 | MPP | api-key, Merchants | 4/5 | | |
 Catalog, orders, and payments APIs for merchants, with a remote MCP server MCPOpenAPIllms.txt | commerce+4 | MCP+2 | — | m2m-oauth, Merchants | 4/5 | | |
 B2B used-crane marketplace with public discovery MCP for agents. MCPOpenAPIllms.txt | mcp+2 | MCP+2 | — | none, Merchants | 3/5 | | |
 Pay-later and payment methods wired into agentic checkout, an early UCP adopter OpenAPIllms.txt | payments+3 | OpenAPI+1 | UCP | api-key, Merchants | 3/5 | | |
 Print-on-demand production and fulfillment over a REST API OpenAPIllms.txt | print-on-demand+2 | OpenAPI+1 | — | api-key, Merchants | 3/5 | | |
 Big-box retail inventory participating in UCP agentic shopping journeys llms.txt | retail+2 | llms.txt | UCP | api-key, Merchants | 2/5 | | |