A directory of services AI agents can actually use — APIs, tools and merchants with machine-readable interfaces and agent payment protocols. Badges are probe-backed, never self-asserted.
| Score |
|---|
 BitrefillMCPOpenAPIllms.txtL402x402 Gift cards, phone top-ups, and eSIMs bought over an eCommerce MCP server, payable with x402 or L402 — no account, no card on file | Merchants | ||
 ShopifyMCPOpenAPIllms.txtACPMPPUCP Storefront, Customer Account, Checkout, and Dev MCP servers plus ACP and UCP support across millions of merchants | Merchants | ||
 Cal.comllms.txt Open-source scheduling with a documented API for availability lookups and booking meetings | Merchants | ||
 PostalFormOpenAPIllms.txtMPP Send physical mail and postcards over an API, payable per item over MPP | Merchants | ||
 SquareMCPOpenAPIllms.txt Catalog, orders, and payments APIs for merchants, with a remote MCP server | Merchants | ||
 KlarnaOpenAPIllms.txtUCP Pay-later and payment methods wired into agentic checkout, an early UCP adopter | Merchants | ||
 PrintfulOpenAPIllms.txt Print-on-demand production and fulfillment over a REST API | Merchants | ||
 Targetllms.txtUCP Big-box retail inventory participating in UCP agentic shopping journeys | Merchants |
Same query as JSON: /api/v1/services?category=shop&has_llms_txt=true