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 |
|---|
 Agentic Commerce Protocol (ACP)OpenAPIllms.txtACP Open spec from OpenAI and Stripe for agent-initiated checkout — product feeds, checkout endpoints, and scoped delegated payment tokens with the merchant staying merchant of record | Payments | ||
 Official MCP RegistryOpenAPI Open catalog of MCP servers with a public API agents and clients can query for installable tools | Platforms | ||
 Universal Commerce Protocol (UCP)OpenAPIllms.txtUCP Open commerce standard from Google and Shopify for agentic shopping journeys across retailers, pairing with AP2 for the payment leg | Payments | ||
 Agent2Agent (A2A)OpenAPIllms.txt Open protocol for agent-to-agent discovery, task delegation, and streaming updates across vendors | Platforms | ||
 Visa Trusted Agent ProtocolOpenAPITAP Open framework using HTTP Message Signatures (RFC 9421) so merchants can recognize and trust a legitimate agent before it transacts | Payments | ||
 CoinlibMCPOpenAPIllms.txt Crypto analysis, guides and coin FAQs over a hosted MCP server and a free key-less JSON API | Search |
Same query as JSON: /api/v1/services?auth_method=none