# /.well-known/api-catalog (RFC 9727)

**Canonical:** https://apis.io/apis/agent-readiness/well-known-api-catalog/  
**Provider:** Agent Readiness — https://apis.io/providers/agent-readiness/  
**Base URL:** https://www.rfc-editor.org/rfc/rfc9727.html  
**Documentation:** https://www.rfc-editor.org/rfc/rfc9727.html

/.well-known/api-catalog (RFC 9727) is one of 15 APIs that [Agent Readiness](https://apis.io/providers/agent-readiness/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Discovery, Linkset, Agent Readiness, and Standards. The published artifact set on APIs.io includes API documentation.

RFC 9727 defines `/.well-known/api-catalog` as the canonical machine entrypoint for discovering an organization's APIs, formatted as an RFC 9264 linkset. Presence of a catalog at this path is one of the cheapest, highest-impact agent-readiness signals — agents do not have to crawl HTML to find specs. As of 2026-05-22, a survey of 74 likely-candidate providers found only four serving a real RFC 9727 linkset at the well-known path — Cloudflare, Memesio, Merge.dev, and Zuplo — with example signal records committed for each.

## Machine-readable artifacts (6)

- **Documentation** — https://www.rfc-editor.org/rfc/rfc9727.html
- **Documentation** — https://www.rfc-editor.org/rfc/rfc9264.html
- **Examples** — https://raw.githubusercontent.com/api-evangelist/agent-readiness/refs/heads/main/examples/agent-readiness-signal-cloudflare-well-known-catalog-example.json
- **Examples** — https://raw.githubusercontent.com/api-evangelist/agent-readiness/refs/heads/main/examples/agent-readiness-signal-memesio-well-known-catalog-example.json
- **Examples** — https://raw.githubusercontent.com/api-evangelist/agent-readiness/refs/heads/main/examples/agent-readiness-signal-merge-well-known-catalog-example.json
- **Examples** — https://raw.githubusercontent.com/api-evangelist/agent-readiness/refs/heads/main/examples/agent-readiness-signal-zuplo-well-known-catalog-example.json

## Other Agent Readiness APIs (12)

- [Model Context Protocol (MCP)](https://apis.io/apis/agent-readiness/model-context-protocol/)
- [OpenAPI Specification](https://apis.io/apis/agent-readiness/openapi-initiative/)
- [AsyncAPI Specification](https://apis.io/apis/agent-readiness/asyncapi-initiative/)
- [JSON Schema](https://apis.io/apis/agent-readiness/json-schema/)
- [Agent Skills](https://apis.io/apis/agent-readiness/agent-skills/)
- [HTTP Message Signatures (RFC 9421)](https://apis.io/apis/agent-readiness/rfc-9421-http-message-signatures/)
- [Web Bot Auth (draft)](https://apis.io/apis/agent-readiness/web-bot-auth/)
- [Content-Usage / AIPREF (IETF AIPREF WG)](https://apis.io/apis/agent-readiness/content-usage-aipref/)
- [Cloudflare Content Signals](https://apis.io/apis/agent-readiness/cloudflare-content-signals/)
- [APIs.json](https://apis.io/apis/agent-readiness/apis-json/)
- [OpenID Connect](https://apis.io/apis/agent-readiness/openid-connect/)
- [Stripe API (reference provider)](https://apis.io/apis/agent-readiness/stripe-api/)

## Tags

Discovery, Linkset, Agent Readiness, Standards

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/agent-readiness/well-known-api-catalog/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/agent-readiness/.