APIs.io

APIs.io is an open-source API search engine and federated discovery network built on the APIs.json specification. It indexes API providers and their individual APIs across the public internet along with the machine-readable artifacts they publish — OpenAPI, AsyncAPI, GraphQL, Arazzo workflows, Postman collections, JSON Schema, JSON-LD contexts, Spectral rulesets, vocabularies, OAuth scopes, plans, rate limits and FinOps profiles — and lets developers and agents search that catalog by keyword, capability, tag, industry, region, artifact type and quality band. As of August 2026 the network published roughly 26,414 providers, 109,100 APIs and 120,595 schemas across 71 industries and 77 curated areas. Every provider is scored with the Kin Score, a 0–100 composite across six weighted facets plus a standalone agent-readiness score. The same read-only OpenAPI 3.1 contract powers three surfaces — a REST API at https://apis.io/api/v1, a Streamable-HTTP MCP server at https://apis.io/mcp, and a set of published Agent Skills — alongside an RFC 9727 api-catalog linkset, an llms.txt and an APIs.json self-description. It is maintained by API Evangelist and serves both API producers submitting profiles and API consumers discovering APIs.

APIs.io publishes 18 APIs on the APIs.io network, including Submit API, APIs API, Areas API, and 15 more. Tagged areas include API Aggregation, API Directory, API Discovery, API Indexing, and API Rating.

The APIs.io catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

APIs.io’s developer surface includes authentication, engineering blog, getting-started guide, changelog, release notes, support, sandbox, and 50 more developer resources.

🌐 Visit website 📡 Source on GitHub

71.9/100 exemplar ▬ flat Agent 51/100 agent native open core · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

18 APIs 1 MCP Servers 7 Features 5 Use Cases

API Aggregation API Directory API DiscoveryAPI IndexingAPI RatingAPI SearchAPIs.jsonSearch Engines API Catalog Agent Discovery MCP Agent Skills OpenAPI API Governance

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 71.9/100 · exemplar

Contract Quality 15.8 / 23

Developer Ergonomics 12.9 / 18

Access Clarity 15.2 / 18

Operational Transparency 9.5 / 12

Contract Governance 3.6 / 11

Discoverability 8.3 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 51/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/apis-io: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 18

Individual APIs this provider publishes, each with its own machine-readable definition.

APIs.io Submit API

Discover a domain's machine-readable API surface and submit a provider for review — the Add-API door, documented first-party from the serving Lambda.

APIs.io APIs API

Index of HTTP application programming interfaces.

APIs.io Areas API

The API Evangelist areas taxonomy — curated topic collections (authentication, webhooks, payments, …), each a scored provider index with its own site. Pro.

APIs.io Artifact Types API

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.

APIs.io Industries API

Industry verticals grouping providers across the catalog.

APIs.io Insights API

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 enginee...

APIs.io Providers API

Organizations publishing APIs on the network.

APIs.io Ratings API

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 provide...

APIs.io Regions API

Geographic regions grouping providers across the catalog.

APIs.io Search API

Search using a cloud search engine.

APIs.io Synthesis API

Decision-grade composites over the catalog — provider comparison, gap analysis, catalog change feed, and recommended-stack design. Pro.

APIs.io Tags API

The tag taxonomy, with network-wide ranking metadata.

APIs.io Cohorts API

Any scored population of providers — a tag, industry, region, area, or VC portfolio — with the distribution, rankings, facet scores, and capability matrix that a Trend or Portfo...

APIs.io Editorial API

Story leads mined from catalog movement (owner tier). 1 operation of the APIs.io API, split out by tag so this surface is documented, rated, and governed on its own.

APIs.io Export API

Bulk dataset pulls of the catalog — ratings and providers as one download (Business tier). 2 operations of the APIs.io API, split out by tag so this surface is documented, rated...

APIs.io Resolve & Enrich API

Agent ergonomics — resolve any identifier (domain, URL, GitHub org) to a provider, and enrich a provider in one call by choosing field groups. 2 operations of the APIs.io API, s...

APIs.io Saved Workspace API

Saved searches and provider lists for a signed-in apis.io API key — save a query, re-run it, and watch what is net-new. 10 operations of the APIs.io API, split out by tag so thi...

APIs.io Venture Capital API

Venture-capital firms as a first-class entity — fund identity plus a network-matched, rated portfolio graph, and the reverse edge from a provider to the VCs that back it. 4 oper...

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Arazzo Workflows 4

Multi-step API workflows described with the Arazzo specification.

APIs.io Compare Keyword Coverage

Run two keyword searches against APIs.io and compare how many APIs the index holds for each term.

ARAZZO

APIs.io Paginate Search Results

Read the first page of a keyword search, learn the total page count, then fetch a following page of results.

ARAZZO

APIs.io Search APIs by Keyword

Search the APIs.io registry for APIs matching a keyword and branch on whether any results were returned.

ARAZZO

APIs.io Submit and Verify API

Submit a valid APIs.json to the APIs.io index, then search the registry to confirm the submitted API appears.

ARAZZO

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

APIs.io MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Apis Io Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apis Io Rate Limits

8 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Apis Io Finops

FINOPS

Features 7

Notable capabilities this provider offers.

API Search

Full-text search across 3,000+ indexed APIs by keyword, resource, action, persona, domain, and schema using a cloud search engine.

APIs.json Indexing

Automatically indexes APIs.json files submitted by API producers to build a comprehensive, machine-readable catalog of API operations.

API Submission

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 API Ratings

Spectral-powered quality rating system that evaluates API documentation completeness and scores APIs to help consumers identify high-quality APIs.

Microservice Architecture

Built as a set of microservices including Search, Engine, Authentication, Publishing, Tags, Rules, Properties, Maintainers, and Ratings APIs.

Topic Search Nodes

Specialized search nodes for domain-specific API discovery including AI, Healthcare, Banking, Payments, Weather, CRM, Cloud, and many more topic areas.

Open Source

The platform is open source, licensed under Apache-2.0, with all microservice APIs available on GitHub under the api-search organization.

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Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Apis Io Context

15 classes · 34 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

APIs.io API Rules

5 rules · 3 warnings 2 info

SPECTRAL

APIs.io API Rules

71 rules · 48 errors 23 warnings

SPECTRAL

JSON Schema 13

Standalone JSON Schema definitions for this provider's data models.

AddAPIsJSON

3 properties

JSON STRUCTURE

Apis Io Search Tag Structure

0 properties

JSON STRUCTURE

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3 fields

EXAMPLE

Apis Io Search Tag Example

0 fields

EXAMPLE

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Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Apis Io Authentication

apiKey · 2 schemes

SECURITY

Apis Io Domain Security

TLSv1.3

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Apis Io Agentic Access

64 operations · 1 acting

AGENTIC

Use Cases 5

What developers build with this provider.

API Discovery

Developers can search for APIs relevant to their project by keyword, discovering APIs across thousands of providers without knowing where to look.

API Submission

API producers can submit their APIs.json files to ensure their APIs are discoverable in the index and properly cataloged with metadata.

Quality Assessment

Development teams use the Spectral ratings system to identify high-quality APIs and avoid poorly documented or unmaintained options.

Catalog Building

Platform teams use APIs.io as a reference implementation for building their own internal API catalogs using the APIs.json format.

Domain-Specific Search

Developers searching for APIs in specific domains (healthcare, finance, AI) can use topic-specific search nodes for more targeted discovery.

Integrations 6

Pre-built integrations with other platforms and tools.

APIs.json

Core integration with the APIs.json specification for machine-readable API description and discovery across the web.

OpenAPI

APIs indexed in APIs.io reference OpenAPI specifications as a key property, linking consumers to technical API contracts.

Spectral

Spectral ruleset integration powers the APIs.io rating system, evaluating API documentation quality against standardized rules.

GitHub

GitHub integration for API submission via issues, source of truth for indexed APIs.json files, and authentication via Personal Access Tokens.

Postman

Postman public workspace integration for running and testing the APIs.io Search API via pre-built collections.

AWS API Gateway

The APIs.io Search API is deployed and managed through AWS API Gateway for scalable, managed API access.

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

Sandbox

Console

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

WellKnown

MCPServer

LLMsTxt

AgentSkill

Design & Contract 12

Pagination, idempotency, versioning, errors, and events

Arazzo

Arazzo

Arazzo

Arazzo

Versioning

SpectralRules

Vocabulary

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

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Build 8

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubRepository

Search API

Search Engine

Authentication API

GitHubRepository

Ratings API

GitHubRepository

ToolCrosswalk

ToolCrosswalk

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Access & Security 6

Authentication, authorization, and security posture

DomainSecurity

Authentication

Authentication

Security

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

Operate 9

Status, limits, changes, and where to get help

IssueTracker

ChangeLog

ReleaseNotes

Support

StatusPage

Changelog artifact

Roadmap

RateLimits

Deprecation

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Commercial 5

Pricing, plans, and the legal terms of use

License

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 4

The organization behind the API

Website

About

Blog

Developer Blog

Other 1

Properties that don't map to a standard resource type

APICatalog

APICatalog

Source (apis.yml)

aid: apis-io
name: APIs.io
description: APIs.io is an open-source API search engine and federated discovery network built on the APIs.json specification.
  It indexes API providers and their individual APIs across the public internet along with the machine-readable artifacts
  they publish — OpenAPI, AsyncAPI, GraphQL, Arazzo workflows, Postman collections, JSON Schema, JSON-LD contexts, Spectral
  rulesets, vocabularies, OAuth scopes, plans, rate limits and FinOps profiles — and lets developers and agents search that
  catalog by keyword, capability, tag, industry, region, artifact type and quality band. As of August 2026 the network published
  roughly 26,414 providers, 109,100 APIs and 120,595 schemas across 71 industries and 77 curated areas. Every provider is
  scored with the Kin Score, a 0–100 composite across six weighted facets plus a standalone agent-readiness score. The same
  read-only OpenAPI 3.1 contract powers three surfaces — a REST API at https://apis.io/api/v1, a Streamable-HTTP MCP server
  at https://apis.io/mcp, and a set of published Agent Skills — alongside an RFC 9727 api-catalog linkset, an llms.txt and
  an APIs.json self-description. It is maintained by API Evangelist and serves both API producers submitting profiles and
  API consumers discovering APIs.
type: Index
deliveryModel:
  model: open-core
  license: MIT
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/apis-io.png
tags:
- API Aggregation
- API Directory
- API Discovery
- API Indexing
- API Rating
- API Search
- APIs.json
- Search Engines
- API Catalog
- Agent Discovery
- MCP
- Agent Skills
- OpenAPI
- API Governance
tags_raw:
- API Aggregation
- API Directory
- API Discovery
- API Indexing
- API Rating
- API Search
- APIs.json
- Search Engine
- API Catalog
- Agent Discovery
- MCP
- Agent Skills
- OpenAPI
- API Governance
url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-08-20'
specificationVersion: '0.23'
apis:
- name: APIs.io Submit API
  description: Discover a domain's machine-readable API surface and submit a provider for review — the Add-API door, documented
    first-party from the serving Lambda.
  humanURL: https://apis.io/add/
  baseURL: https://apis.io
  tags:
  - Submissions
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/apis-io-submit-api-openapi.yml
- aid: apis-io:apis-io-apis-api
  name: APIs.io APIs API
  description: Index of HTTP application programming interfaces.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  tags_raw:
  - APIs
  properties:
  - type: OpenAPI
    url: openapi/apis-io-apis-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-apis-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServer
    url: https://apis.io/mcp
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-areas-api
  name: APIs.io Areas API
  description: The API Evangelist areas taxonomy — curated topic collections (authentication, webhooks, payments, …), each
    a scored provider index with its own site. Pro.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Areas
  properties:
  - type: OpenAPI
    url: openapi/apis-io-areas-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-areas-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-artifact-types-api
  name: APIs.io Artifact Types API
  description: 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.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Artifact Types
  properties:
  - type: OpenAPI
    url: openapi/apis-io-artifact-types-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-artifact-types-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-industries-api
  name: APIs.io Industries API
  description: Industry verticals grouping providers across the catalog.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Industries
  properties:
  - type: OpenAPI
    url: openapi/apis-io-industries-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-industries-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-insights-api
  name: APIs.io Insights API
  description: 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.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Insights
  properties:
  - type: OpenAPI
    url: openapi/apis-io-insights-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-insights-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-providers-api
  name: APIs.io Providers API
  description: Organizations publishing APIs on the network.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Providers
  properties:
  - type: OpenAPI
    url: openapi/apis-io-providers-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-providers-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-ratings-api
  name: APIs.io Ratings API
  description: 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.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Ratings
  properties:
  - type: OpenAPI
    url: openapi/apis-io-ratings-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-ratings-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-regions-api
  name: APIs.io Regions API
  description: Geographic regions grouping providers across the catalog.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Regions
  properties:
  - type: OpenAPI
    url: openapi/apis-io-regions-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-regions-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-search-api
  name: APIs.io Search API
  description: Search using a cloud search engine.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/apis-io-search-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-search-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-synthesis-api
  name: APIs.io Synthesis API
  description: Decision-grade composites over the catalog — provider comparison, gap analysis, catalog change feed, and recommended-stack
    design. Pro.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Synthesis
  properties:
  - type: OpenAPI
    url: openapi/apis-io-synthesis-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-synthesis-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-tags-api
  name: APIs.io Tags API
  description: The tag taxonomy, with network-wide ranking metadata.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags:
  - Tags
  properties:
  - type: OpenAPI
    url: openapi/apis-io-tags-api-openapi.yml
  - type: Overlay
    url: overlays/apis-io-tags-api-overlay.yaml
  - type: Documentation
    url: https://apis.io/developer/overview/
  - type: MCPServerCard
    url: https://apis.io/.well-known/mcp/server-card.json
  - type: AgentSkills
    url: https://apis.io/skills/
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-io-discovery/SKILL.md
  - type: AgentSkills
    url: https://raw.githubusercontent.com/api-commons/agent-skills/main/apis-json-author/SKILL.md
  - type: PostmanCollection
    url: https://www.postman.com/api-evangelist/apis-io-api-evangelist-engine/collection/hn8xpmd/apis-io-search-api
  - type: Authentication
    url: https://apis.io/developer/authentication/
  - type: RateLimits
    url: https://apis.io/developer/plans/
  - type: ChangeLog
    url: https://apis.io/changelog/
  - type: StatusPage
    url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-search-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/json-schema/apis-io-search-ap-is-json-schema.json
- aid: apis-io:apis-io-cohorts-api
  name: APIs.io Cohorts API
  description: Any scored population of providers — a tag, industry, region, area, or VC portfolio — with the distribution,
    rankings, facet scores, and capability matrix that a Trend or Portfolio Report is built from. 7 operations of the APIs.io
    API, split out by tag so this surface is documented, rated, and governed on its own.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  properties:
  - type: OpenAPI
    url: openapi/apis-io-cohorts-api-openapi.yml
  - type: SpectralRules
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/rules/apis-io-spectral-rules.yml
- aid: apis-io:apis-io-editorial-api
  name: APIs.io Editorial API
  description: Story leads mined from catalog movement (owner tier). 1 operation of the APIs.io API, split out by tag so this
    surface is documented, rated, and governed on its own.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  properties:
  - type: OpenAPI
    url: openapi/apis-io-editorial-api-openapi.yml
  - type: SpectralRules
    url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/rules/apis-io-spectral-rules.yml
- aid: apis-io:apis-io-export-api
  name: APIs.io Export API
  description: Bulk dataset pulls of the catalog — ratings and providers as one download (Business tier). 2 operations of
    the APIs.io API, split out by tag so this surface is documented, rated, and governed on its own.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  properties:
  - type: OpenAPI
    url: openapi/apis-io-export-api-openapi.yml
  - type: SpectralRules
    url: rules/apis-io-spectral-rules.yml
- aid: apis-io:apis-io-resolve-enrich-api
  name: APIs.io Resolve & Enrich API
  description: Agent ergonomics — resolve any identifier (domain, URL, GitHub org) to a provider, and enrich a provider in
    one call by choosing field groups. 2 operations of the APIs.io API, split out by tag so this surface is documented, rated,
    and governed on its own.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  properties:
  - type: OpenAPI
    url: openapi/apis-io-resolve-enrich-api-openapi.yml
  - type: SpectralRules
    url: rules/apis-io-spectral-rules.yml
- aid: apis-io:apis-io-saved-workspace-api
  name: APIs.io Saved Workspace API
  description: Saved searches and provider lists for a signed-in apis.io API key — save a query, re-run it, and watch what
    is net-new. 10 operations of the APIs.io API, split out by tag so this surface is documented, rated, and governed on its
    own.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  properties:
  - type: OpenAPI
    url: openapi/apis-io-saved-workspace-api-openapi.yml
  - type: SpectralRules
    url: rules/apis-io-spectral-rules.yml
- aid: apis-io:apis-io-venture-capital-api
  name: APIs.io Venture Capital API
  description: Venture-capital firms as a first-class entity — fund identity plus a network-matched, rated portfolio graph,
    and the reverse edge from a provider to the VCs that back it. 4 operations of the APIs.io API, split out by tag so this
    surface is documented, rated, and governed on its own.
  humanURL: https://apis.io/developer/overview/
  baseURL: https://apis.io/api/v1
  tags: []
  properties:
  - type: OpenAPI
    url: openapi/apis-io-venture-capital-api-openapi.yml
  - type: SpectralRules
    url: rules/apis-io-spectral-rules.yml
common:
- type: IssueTracker
  url: https://github.com/apisio/apis.io/issues
- type: License
  name: MIT
  url: https://github.com/apisio/apis.io/blob/master/LICENSE
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/apisio/overview
- type: AgenticAccess
  url: agentic-access/apis-io-agentic-access.yml
- type: DomainSecurity
  url: security/apis-io-domain-security.yml
- type: Authentication
  url: authentication/apis-io-authentication.yml
- type: Arazzo
  url: arazzo/apis-io-compare-keyword-coverage-workflow.yml
  name: APIs.io Compare Keyword Coverage
- type: Arazzo
  url: arazzo/apis-io-paginate-search-results-workflow.yml
  name: APIs.io Paginate Search Results
- type: Arazzo
  url: arazzo/apis-io-search-apis-workflow.yml
  name: APIs.io Search APIs by Keyword
- type: Arazzo
  url: arazzo/apis-io-submit-and-verify-api-workflow.yml
  name: APIs.io Submit and Verify API
- type: Website
  url: https://apis.io
- type: About
  url: https://apis.io/about/
- type: Blog
  url: https://apis.io/blog/
- type: DeveloperPortal
  url: https://apis.io/developer/
- type: Blog
  url: https://apis.io/developer/blog/
  title: Developer Blog
- type: GettingStarted
  url: https://apis.io/developer/getting-started/
- type: Authentication
  url: https://apis.io/developer/authentication/
- type: Plans
  url: https://apis.io/developer/plans/
- type: ChangeLog
  url: https://apis.io/changelog/
- type: ReleaseNotes
  url: https://apis.io/changelog/
- type: Versioning
  url: https://apis.io/developer/overview
- type: Support
  url: https://apis.io/support/
- type: TermsOfService
  url: https://apis.io/terms/
- type: PrivacyPolicy
  url: https://apis.io/privacy/
- type: GitHubOrganization
  url: https://github.com/api-search
- type: GitHubRepository
  url: https://github.com/apisio/apis.io
- type: GitHubRepository
  url: https://github.com/api-search/apis-io-search
  title: Search API
- type: GitHubRepository
  url: https://github.com/api-search/apis-io-engine
  title: Search Engine
- type: GitHubRepository
  url: https://github.com/api-search/apis-io-authentication
  title: Authentication API
- type: GitHubRepository
  url: https://github.com/api-search/apis-io-ratings
  title: Ratings API
- type: SpectralRules
  url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/rules/apis-io-spectral-rules.yml
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/apis-io/refs/heads/main/vocabulary/apis-io-vocabulary.yaml
- type: Features
  data:
  - name: API Search
    description: Full-text search across 3,000+ indexed APIs by keyword, resource, action, persona, domain, and schema using
      a cloud search engine.
  - name: APIs.json Indexing
    description: Automatically indexes APIs.json files submitted by API producers to build a comprehensive, machine-readable
      catalog of API operations.
  - name: API Submission
    description: 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.
  - name: Spectral API Ratings
    description: Spectral-powered quality rating system that evaluates API documentation completeness and scores APIs to help
      consumers identify high-quality APIs.
  - name: Microservice Architecture
    description: Built as a set of microservices including Search, Engine, Authentication, Publishing, Tags, Rules, Properties,
      Maintainers, and Ratings APIs.
  - name: Topic Search Nodes
    description: Specialized search nodes for domain-specific API discovery including AI, Healthcare, Banking, Payments, Weather,
      CRM, Cloud, and many more topic areas.
  - name: Open Source
    description: The platform is open source, licensed under Apache-2.0, with all microservice APIs available on GitHub under
      the api-search organization.
- type: UseCases
  data:
  - name: API Discovery
    description: Developers can search for APIs relevant to their project by keyword, discovering APIs across thousands of
      providers without knowing where to look.
  - name: API Submission
    description: API producers can submit their APIs.json files to ensure their APIs are discoverable in the index and properly
      cataloged with metadata.
  - name: Quality Assessment
    description: Development teams use the Spectral ratings system to identify high-quality APIs and avoid poorly documented
      or unmaintained options.
  - name: Catalog Building
    description: Platform teams use APIs.io as a reference implementation for building their own internal API catalogs using
      the APIs.json format.
  - name: Domain-Specific Search
    description: Developers searching for APIs in specific domains (healthcare, finance, AI) can use topic-specific search
      nodes for more targeted discovery.
- type: Integrations
  data:
  - name: APIs.json
    description: Core integration with the APIs.json specification for machine-readable API description and discovery across
      the web.
  - name: OpenAPI
    description: APIs indexed in APIs.io reference OpenAPI specifications as a key property, linking consumers to technical
      API contracts.
  - name: Spectral
    description: Spectral ruleset integration powers the APIs.io rating system, evaluating API documentation quality against
      standardized rules.
  - name: GitHub
    description: GitHub integration for API submission via issues, source of truth for indexed APIs.json files, and authentication
      via Personal Access Tokens.
  - name: Postman
    description: Postman public workspace integration for running and testing the APIs.io Search API via pre-built collections.
  - name: AWS API Gateway
    description: The APIs.io Search API is deployed and managed through AWS API Gateway for scalable, managed API access.
- type: WellKnown
  url: well-known/apis-io-well-known.yml
- type: APICatalog
  url: https://apis.io/.well-known/api-catalog
- type: MCPServer
  url: https://apis.io/mcp
- type: ToolCrosswalk
  url: mcp/apis-io-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/apis-io-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Conformance
  url: conformance/apis-io-conformance.yml
- type: ErrorCatalog
  url: errors/apis-io-problem-types.yml
- type: Lifecycle
  url: lifecycle/apis-io-lifecycle.yml
- type: StatusPage
  url: https://www.postman.com/api-evangelist/apis-io/monitor/APIs-io-Search---Status~1ef6bc29-9da9-4040-b98b-cef03be1155e
- type: Conventions
  url: conventions/apis-io-conventions.yml
- type: ChangeLog
  url: changelog/apis-io-changelog.yml
  title: Changelog artifact
- type: DataModel
  url: data-model/apis-io-data-model.yml
- type: Sandbox
  url: sandbox/apis-io-sandbox.yml
- type: Console
  url: https://apis.io/developer/api/
- type: Documentation
  url: https://apis.io/developer/
- type: APIReference
  url: https://apis.io/developer/api/
- type: Roadmap
  url: https://apis.io/roadmap/
- type: Pricing
  url: https://apis.io/developer/plans/
- type: SignUp
  url: https://apis.io/developer/account
- type: RateLimits
  url: https://apis.io/developer/rate-limits
- type: Deprecation
  url: https://apis.io/developer/deprecation
- type: Security
  url: https://apis.io/developer/security
- type: SecurityTxt
  url: https://apis.io/.well-known/security.txt
- type: VulnerabilityDisclosure
  url: https://apis.io/developer/security
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-10'
  status: enriched
  artifacts_added: 37
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

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

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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

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This provider

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Every operation they expose

curl "https://apis.io/api/v1/providers/apis-io/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/apis-io/evidence"

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