OpenAPI website screenshot

OpenAPI

OpenAPI (formerly Swagger Specification) is a standard, language-agnostic specification for describing RESTful APIs in a machine-readable format. It enables automated documentation generation, client code generation, and API testing, serving as a contract between API providers and consumers.

OpenAPI publishes 1 API on the APIs.io network. Tagged areas include Documentation, REST, and Specification.

The OpenAPI catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

OpenAPI’s developer surface includes documentation, engineering blog, and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub
17.9/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFreemium
1 APIs
DocumentationRESTSpecification

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 17.9/100 · emerging
Contract Quality 2.7 / 25
Developer Ergonomics 3.8 / 20
Access Clarity 3.2 / 20
Operational Transparency 1.4 / 13
Contract Governance 1.2 / 12
Discoverability 5.7 / 10
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
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/openapi: 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 1

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

OpenAPI Specification

The OpenAPI Specification (OAS) defines a standard, programming language-agnostic interface description for HTTP APIs.

Open Collections 88

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

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Pricing Plans 1

Published pricing tiers and plan structures.

Openapi Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Openapi Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Openapi Finops

FINOPS

Semantic Vocabularies 1

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

Openapi Context

0 classes · 50 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

OpenAPI API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 25

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

OpenAPI Components Object

10 properties

JSON SCHEMA

OpenAPI Contact Object

3 properties

JSON SCHEMA

OpenAPI Document

10 properties

JSON SCHEMA

OpenAPI Encoding Object

5 properties

JSON SCHEMA

OpenAPI Example Object

4 properties

JSON SCHEMA

OpenAPI External Documentation Object

2 properties

JSON SCHEMA

OpenAPI Header Object

10 properties

JSON SCHEMA

OpenAPI Info Object

7 properties

JSON SCHEMA

OpenAPI License Object

3 properties

JSON SCHEMA

OpenAPI Link Object

6 properties

JSON SCHEMA

OpenAPI Media Type Object

4 properties

JSON SCHEMA

OpenAPI OAuth Flow Object

4 properties

JSON SCHEMA

OpenAPI OAuth Flows Object

4 properties

JSON SCHEMA

OpenAPI Operation Object

12 properties

JSON SCHEMA

OpenAPI Parameter Object

13 properties

JSON SCHEMA

OpenAPI Path Item Object

13 properties

JSON SCHEMA

OpenAPI Paths Object

0 properties

JSON SCHEMA

OpenAPI Request Body Object

3 properties

JSON SCHEMA

OpenAPI Response Object

4 properties

JSON SCHEMA

OpenAPI Responses Object

1 properties

JSON SCHEMA

OpenAPI Security Requirement Object

0 properties

JSON SCHEMA

OpenAPI Security Scheme Object

8 properties

JSON SCHEMA

OpenAPI Server Variable Object

3 properties

JSON SCHEMA

OpenAPI Server Object

3 properties

JSON SCHEMA

OpenAPI Tag Object

3 properties

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Security Posture 1

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

Openapi Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: openapi
name: OpenAPI
description: OpenAPI (formerly Swagger Specification) is a standard, language-agnostic specification for describing RESTful
  APIs in a machine-readable format. It enables automated documentation generation, client code generation, and API testing,
  serving as a contract between API providers and consumers.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openapi.png
tags:
- Documentation
- REST
- Specification
url: https://raw.githubusercontent.com/api-evangelist/openapi/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: openapi:openapi-specification
  name: OpenAPI Specification
  description: The OpenAPI Specification (OAS) defines a standard, programming language-agnostic interface description for
    HTTP APIs.
  humanURL: https://spec.openapis.org/oas/latest.html
  tags:
  - API Description
  - OpenAPI
  - REST
  properties:
  - type: Documentation
    url: https://spec.openapis.org/oas/v3.1.0
  - type: Reference
    url: https://github.com/OAI/OpenAPI-Specification
common:
- type: DomainSecurity
  url: security/openapi-domain-security.yml
- type: Website
  url: https://www.openapis.org/
- type: Documentation
  url: https://spec.openapis.org/oas/latest.html
- type: GitHubOrganization
  url: https://github.com/OAI
- type: Blog
  url: https://www.openapis.org/blog
- type: LlmsText
  url: https://www.openapis.org/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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