APIs.io
APIs.io is an open source API search engine and directory that uses APIs.json files to discover, index, and catalog APIs across the web. Built on the APIs.json specification, it provides a searchable entry point for developers to find public APIs by keyword, resource, action, persona, domain, and schema. The platform indexes 779 providers, 3,188 APIs, 587 capabilities, 36,602 schemas, 49 event specs, 2,078 vocabularies, and 450 rulesets. It is maintained by Kin Lane, Nicolas Grenier, and Steven Willmott and supports both API producers (submitting APIs) and API consumers (discovering APIs). APIs.io uses a Spectral-powered rating system to evaluate API documentation quality.
APIs
APIs.io Search API
The APIs.io Search API allows developers to search for APIs across all indexed APIs.json files using keywords or phrases, and to submit new APIs to the index by providing a vali...
Capabilities
APIs.io API Discovery and Search
Workflow capability for searching, discovering, and submitting APIs using the APIs.io search engine. Enables developers and platform engineers to programmatically find APIs by k...
Run with NaftikoFeatures
Full-text search across 3,000+ indexed APIs by keyword, resource, action, persona, domain, and schema using a cloud search engine.
Automatically indexes APIs.json files submitted by API producers to build a comprehensive, machine-readable catalog of API operations.
API producers can submit their APIs to the index by providing a valid APIs.json document via the Search API POST endpoint or GitHub issues.
Spectral-powered quality rating system that evaluates API documentation completeness and scores APIs to help consumers identify high-quality APIs.
Built as a set of microservices including Search, Engine, Authentication, Publishing, Tags, Rules, Properties, Maintainers, and Ratings APIs.
Specialized search nodes for domain-specific API discovery including AI, Healthcare, Banking, Payments, Weather, CRM, Cloud, and many more topic areas.
The platform is open source, licensed under Apache-2.0, with all microservice APIs available on GitHub under the api-search organization.
Use Cases
Developers can search for APIs relevant to their project by keyword, discovering APIs across thousands of providers without knowing where to look.
API producers can submit their APIs.json files to ensure their APIs are discoverable in the index and properly cataloged with metadata.
Development teams use the Spectral ratings system to identify high-quality APIs and avoid poorly documented or unmaintained options.
Platform teams use APIs.io as a reference implementation for building their own internal API catalogs using the APIs.json format.
Developers searching for APIs in specific domains (healthcare, finance, AI) can use topic-specific search nodes for more targeted discovery.
Integrations
Core integration with the APIs.json specification for machine-readable API description and discovery across the web.
APIs indexed in APIs.io reference OpenAPI specifications as a key property, linking consumers to technical API contracts.
Spectral ruleset integration powers the APIs.io rating system, evaluating API documentation quality against standardized rules.
GitHub integration for API submission via issues, source of truth for indexed APIs.json files, and authentication via Personal Access Tokens.
Postman public workspace integration for running and testing the APIs.io Search API via pre-built collections.
The APIs.io Search API is deployed and managed through AWS API Gateway for scalable, managed API access.