DISCOVERY SIGNALS · LIVE FROM THE INDEX

Which APIs are listed in an MCP registry?

30%

of the APIs in the Discry Index are listed in a public MCP registry.

120 pass275 failof 395 scanned

What this signal is

MCP registries are public catalogs of Model Context Protocol servers. Agents and agent platforms browse them to find tools; a listing is the closest thing the agent ecosystem has to an app-store presence.

Discry checks whether the API (first-party or well-maintained community server) appears in a public registry an agent can query.

Definition →How to ship it →

Notable passes and misses

Registry presence is now the norm among major APIs — Stripe, OpenAI, Anthropic, GitHub, Slack, Twilio, Shopify, and Cloudflare are all listed, a mix of first-party and community servers. The more discriminating question has moved one layer down: whether the listing points at a maintained, first-party server, and whether the API also self-hosts discovery via the well-known manifest.

Every API, checked

395 APIs
Pass120
Show the other 90
Fail275
Show the other 245

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Check data assessed under Discry methodology 3.0.0 · Methodology