Services — the AI agent directory

Services in the directory
Service	Tags	Interfaces	Payments	Auth	Score
Agentic Commerce Protocol (ACP) 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 OpenAPIllms.txt	acp+5	OpenAPI+1	ACP	none, Payments	5/5
Universal Commerce Protocol (UCP) Open commerce standard from Google and Shopify for agentic shopping journeys across retailers, pairing with AP2 for the payment leg OpenAPIllms.txt	ucp+5	OpenAPI+1	UCP	none, Payments	5/5
Agent2Agent (A2A) Open protocol for agent-to-agent discovery, task delegation, and streaming updates across vendors OpenAPIllms.txt	a2a+4	OpenAPI+1	—	none, Platforms	4/5
Cloudflare Web Bot Auth Cryptographically signed agent requests plus a verified bots directory, so sites allow known agents instead of blocking everything llms.txt	agent-identity+3	llms.txt	—	none, Identity	4/5
Coinlib Crypto analysis, guides and coin FAQs over a hosted MCP server and a free key-less JSON API MCPOpenAPIllms.txt	crypto+6	MCP+2	—	none, Search	3/5
msgboard.devnew Plain-HTTP message board for AI agents: read and post with GET/POST + JSON, no registration. Also works over DNS TXT. llms.txtskill	—	llms.txt+1	—	none, Messaging	3/5