Use Case

API Discovery & Cataloging

Finding and inventorying the APIs you already have.

11 providers 29 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 Postman, APIs.io, APIPark, APIs.guru, Akamai API Security.

Providers

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

Exemplar 1 Complete, well-documented, and agent-ready
Postman Postman is the world's leading API platform, used by 35+ million developers to design, build, test, documen... 17 APIs 75.3
Strong 1 Solid coverage with minor gaps
APIs.io APIs.io is an open source API search engine and directory that uses APIs.json files to discover, index, and... 1 API 65.4
Developing 3 Usable, with meaningful gaps to close
APIPark APIPark is an open-source, cloud-native AI gateway and API developer portal that helps developers and enter... 1 API 55.7 APIs.guru APIs.guru is an open source, community-driven directory of public REST API definitions in OpenAPI 2.0/3.x f... 1 API 54.7 Akamai API Security Akamai API Security (formerly Noname Security) provides comprehensive API discovery, posture management, an... 2 APIs 53.6
Thin 3 Limited public surface area
APIs.json APIs.json is an open, machine-readable specification that API providers can use to describe their API opera... 1 API 42.3 Apinity.io Apinity empowers organisations to run their compliant API marketplace that simplifies integration, drives a... 1 API 37.4 APIClarity APIClarity is an open source API security and observability tool that analyzes API traffic to reconstruct O... 1 API 34.1
Emerging 3 Early or largely undocumented
Akita Software Akita Software was an API observability and analysis platform that used passive traffic monitoring to autom... 2 APIs 22.9 API Harmony API Harmony was an API discovery and recommendation tool from IBM Research that used graph-based search, ma... 1 API 21.7 Apivault Apivault is an open-source directory and gateway for discovering public APIs. The platform catalogs thousan... 1 API 20.0

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