APIs.io API
APIs.io API
Read-only discovery API over the APIs.io catalog of providers, APIs, tags, and artifacts.
A first-class, read-only discovery API over the APIs.io network.
The catalog is assembled from per-provider repositories and exposed here as the
providers, apis, and tags resources, a first-class collection per
artifact type (/openapis, /asyncapis, /arazzo, /postman, /json-schemas, …),
and a unified /search endpoint that spans them.
Design notes:
- Identifiers.
aidis the stable id. A provider istwilio; an API istwilio:twilio-accounts-api(<provider>:<api-slug>). - Artifacts by reference. API records carry a
propertieslist of artifacts (type+url). By default only references are returned; passinclude=contentto inline an artifact's body. - Selectable artifacts. Use
artifact_typesto return only the artifact types you care about (e.g.OpenAPI,Postman). - Open now, key-ready. v1 is open and read-only. An
ApiKeyAuthscheme is defined but not enforced, so metering can be added later without a breaking change.
Tags
Providers
Organizations publishing APIs on the network.
APIs
Individual APIs, each owned by a provider and described by artifacts.
Tags
The tag taxonomy, with network-wide ranking metadata.
Industries
Industry verticals grouping providers across the catalog.
Regions
Geographic regions grouping providers across the catalog.
Ratings
The APIs.io API rating system — a 0–100 composite score, five bands, a trend marker, and six weighted facets measuring how complete, governed, and integration-ready each provider's public API surface is. Rubric v0.3.
Artifact Types
First-class, per-type artifact collections (OpenAPI, AsyncAPI, Arazzo, Postman, JSON Schema, and more). Each path filters and normalizes one artifact type across all providers.
Search
Unified cross-resource search.
Insights
Demand-side intelligence — what ~5,800 companies (Fortune 1000 + API providers) build, buy, and hire for around APIs, data, and AI, derived from job postings, press, and engineering blogs. Discovery is free; per-company depth, gaps, and provider matches are Pro.
Venture Capital
Venture-capital firms as a first-class entity — fund identity plus a network-matched, rated PORTFOLIO GRAPH. Browse firms, walk a fund's portfolio (filter to API providers / by rating band), and follow the reverse edge from a provider to the VCs that back it. Free discovery.
Resolve & Enrich
Agent ergonomics — resolve any identifier (domain, URL, GitHub org) to a provider, and enrich a provider in one call by choosing field groups. Free (the rating and insights enrichment groups are Pro).
Saved Workspace
A Pro dimension — per-user saved searches, lists, and net-new deltas. The same capability the MCP exposes as tools; turns apis.io from stateless lookup into a persistent research workspace. Requires an API key.