# APIs.io — Federated API Discovery Network

> APIs.io is a federated, agent-friendly directory of public-internet APIs. It indexes API providers, their individual APIs, schemas, event-driven specs, governance rules, vocabularies, and JSON-LD contexts — each slice exposed at its own subdomain and at its own machine-readable feed.

APIs.io is intended for both humans and agents. Indexing, retrieval-augmented generation (RAG), grounding, and model training are explicitly permitted — see https://apis.io/terms/. Every page exposes a `<link rel="api-catalog">` pointing at an RFC 9727 linkset that enumerates the indexed APIs, and every site permits search, ai-input, and ai-train via Cloudflare Content-Signals and AIPREF Content-Usage in robots.txt.

The network currently indexes roughly 6445 providers, 22615 APIs, and 98952 schemas. Counts update with each build of https://github.com/api-search/network.

## Core entry points

- [APIs.io home](https://apis.io/): Search across the whole network by provider, schema, or name
- [About APIs.io](https://apis.io/about/): What the network is and how it is built
- [Add an API](https://apis.io/add/): How to submit a provider profile
- [Blog](https://apis.io/blog/): Network updates, provider profiles, weekly roundups
- [Insights](https://apis.io/insights/): Cross-network reports (top providers, top tags, spec-format breakdowns)
- [Skills](https://apis.io/skills/): Agent skills published by the network

## Sister sites in the APIs.io network

- [providers.apis.io](https://providers.apis.io/): API provider profiles — one page per organization (Stripe, GitHub, FDA, …)
- [apis.apis.io](https://apis.apis.io/): Individual API records — one page per published API, with OpenAPI links
- [industries.apis.io](https://industries.apis.io/): Industry-vertical index — every provider mapped to one or more of 29 industries (financial services, healthcare, manufacturing, transportation, etc.)
- [regions.apis.io](https://regions.apis.io/): Sales-region index — providers grouped by macro sales region (North America, LATAM, EMEA, APAC, Greater China, ANZ, …)
- [skills.apis.io](https://skills.apis.io/): Official Claude Agent Skill index — 800+ SKILL.md files across 80+ providers, rendered inline with per-skill and per-provider rollup pages
- [mcp.apis.io](https://mcp.apis.io/): Official MCP server index — 230+ Model Context Protocol servers across 220+ providers, with install hints and source links
- [schemas.apis.io](https://schemas.apis.io/): JSON Schemas extracted from the indexed APIs
- [asyncapi.apis.io](https://asyncapi.apis.io/): AsyncAPI event-driven specifications
- [json-ld.apis.io](https://json-ld.apis.io/): JSON-LD contexts and semantic vocabularies
- [rules.apis.io](https://rules.apis.io/): Spectral governance rules
- [vocabularies.apis.io](https://vocabularies.apis.io/): Provider tag vocabularies
- [tags.apis.io](https://tags.apis.io/): Tag index across the network
- [examples.apis.io](https://examples.apis.io/): API usage examples
- [developer.apis.io](https://developer.apis.io/): Developer portal and feeds
- [plans.apis.io](https://plans.apis.io/): API pricing plan profiles
- [rate-limits.apis.io](https://rate-limits.apis.io/): API rate-limit profiles
- [finops.apis.io](https://finops.apis.io/): API FinOps profiles

## Machine-readable feeds

- [/.well-known/api-catalog](https://apis.io/.well-known/api-catalog): RFC 9727 linkset for the apis.io hub
- [providers.apis.io api-catalog](https://providers.apis.io/.well-known/api-catalog): Linkset of every indexed provider
- [apis.apis.io api-catalog](https://apis.apis.io/.well-known/api-catalog): Linkset of every indexed API
- [APIs.json profile](https://apis.io/apis.json): Self-describing APIs.json document for the network
- [sitemap.xml](https://apis.io/sitemap.xml): Per-subdomain sitemaps live at `<subdomain>/sitemap.xml`
- [search-index.json](https://apis.io/search-index.json): Front-end search index used by the hub homepage

## Related projects

- [APIs.json](https://apisjson.org): The machine-readable API discovery format that every profile in this network uses
- [API Commons](https://apicommons.org): Standard vocabulary of common operational properties referenced from APIs.json
- [Naftiko](https://github.com/naftiko/framework): Open-source framework that runs capability specs as REST, MCP, and Agent Skill surfaces
- [api-evangelist](https://github.com/api-evangelist): Upstream Git-versioned provider profile repos this network is built from

## License and usage

All content on APIs.io is published as a public catalog of API metadata, intended for both human and machine consumption. Search indexing, AI grounding/RAG, and AI training are explicitly permitted. See https://apis.io/terms/ for the full terms.