Use Case

API Discovery & Cataloging

Finding and inventorying the APIs you already have.

11 providers 49 APIs 6 declared variants

Building a picture of every API in an estate or market — inventory and catalogs, indexing specs, classification, and the discovery surfaces humans and agents search.

11 API providers on the APIs.io network offer api discovery & cataloging. The highest-rated are APIs.io, Postman, Akamai API Security, APIPark, APIs.guru.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 2 Complete, well-documented, and agent-ready
APIs.ioAPIs.io is an open-source API search engine and federated discovery network built on the APIs.json specific...18 APIs71.0PostmanPostman is the world's leading API platform, used by 35+ million developers to design, build, test, documen...21 APIs67.2
Thin 4 Limited public surface area
Akamai API SecurityAkamai API Security (formerly Noname Security) provides comprehensive API discovery, posture management, an...1 API39.2APIParkAPIPark is an open-source, cloud-native AI gateway and API developer portal that helps developers and enter...1 API34.5APIs.guruAPIs.guru is an open source, community-driven directory of public REST API definitions in OpenAPI 2.0/3.x f...1 API33.0APIClarityAPIClarity is an open source API security and observability tool that analyzes API traffic to reconstruct O...1 API30.6
Emerging 4 Early or largely undocumented
Akita SoftwareAkita Software was an API observability and analysis platform that used passive traffic monitoring to autom...2 APIs25.8APIs.jsonAPIs.json is an open, machine-readable specification that API providers can use to describe their API opera...1 API24.3ApivaultApivault is an open-source directory and gateway for discovering public APIs. The platform catalogs thousan...1 API19.8Apinity.ioApinity empowers organisations to run their compliant API marketplace that simplifies integration, drives a...1 API19.1
Minimal 1 Almost no public developer surface
API HarmonyAPI Harmony was an API discovery and recommendation tool from IBM Research that used graph-based search, ma...1 API10.1

What Providers Actually Declared

This use case is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

API DiscoveryAPI Discovery and CatalogCloud API DiscoveryInternal API CatalogInternal API MarketplaceShadow API Discovery

Scroll for all 6

Work with this as data

Every use case here is available over the APIs.io API and to AI agents over MCP. Use Cases is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for use cases

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=api-discovery&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/api-discovery"

Discovery needs no key. Ratings and market analysis are Pro.

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