APIs.guru
APIs.guru is an open source, community-driven directory of public REST API definitions in OpenAPI 2.0/3.x format, described as the Wikipedia for Web APIs. The project searches for public API definitions, converts various formats to OpenAPI 3.0, corrects errors in approximately 80% of definitions, and enriches entries with logos, categories, and metadata. It catalogs over 2,500 API descriptions with 100,000+ endpoints, updating definitions weekly from original sources. The platform is licensed under CC0-1.0 for contributed definitions and welcomes community contributions through GitHub.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles APIs.guru the way a machine reads it — 43 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — APIs.guru scores 32.3/100 (thin), with a separate agent-readiness read of 26/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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How we profile APIs.guru
Each block below is one kind of artifact we hold for APIs.guru. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 1
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
APIs.guru APIs API
Actions relating to APIs in the collection
Open Collections 2
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTION.guru APIs API
OPEN COLLECTIONGraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
APIs.guru GraphQL API
GRAPHQLPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Apis Guru Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Apis Guru Finops
FINOPSFeatures 8
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
OpenAPI Directory
Comprehensive directory of over 2,500 public API definitions in OpenAPI 2.0 and 3.x format, updated weekly from original sources.
Format Conversion
Converts various API description formats (RAML, Google Discovery, AWS, etc.) to OpenAPI 3.0 standard for consistency and compatibility.
Quality Control
Corrects errors in approximately 80% of API definitions and validates all specifications before inclusion in the directory.
AsyncAPI Directory
Companion directory of asynchronous API specifications in AsyncAPI format for event-driven and message-based APIs.
GraphQL Voyager
Visual tool that represents any GraphQL API as an interactive graph, making schema exploration intuitive and visual.
REST API Access
Public REST API at api.apis.guru/v2 for programmatic access to the directory, metrics, provider lists, and individual API specs.
RSS Feeds
RSS feeds for both newly added and recently updated API definitions, allowing developers to stay current with directory changes.
Metadata Enrichment
Enriches API definitions with logos, categories, provider names, and other metadata to improve discoverability and browsability.
Scroll within the panel for all 8 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Apis Guru Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
APIs.guru API Rules
SPECTRALAPIs.guru API Rules
SPECTRALJSON Schema 4
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
JSON Structure 4
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Apis Guru Ap Is Structure
JSON STRUCTUREApis Guru Api Structure
JSON STRUCTUREApis Guru Api Version Structure
JSON STRUCTUREApis Guru Metrics Structure
JSON STRUCTUREExamples 4
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 6
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
API Discovery
Developers can search and browse the directory to discover public APIs across thousands of providers by category, provider, or keyword.
SDK Generation
OpenAPI specs from the directory can be used with tools like Microsoft Kiota and Speakeasy to generate API client SDKs.
API Documentation
ReDoc and other documentation tools use the directory specs to generate beautiful, interactive API documentation automatically.
API Testing
HTTP Toolkit and other testing tools leverage the directory for debugging and mocking API requests against standardized specs.
Schema Exploration
GraphQL Voyager allows teams to visually explore GraphQL schema relationships to understand API structure quickly.
API Catalog Building
Organizations can use the directory as a foundation for building their own internal API catalogs and governance programs.
Integrations 5
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
HTTP Toolkit
HTTP debugging and testing platform that integrates with API definitions from the APIs.guru directory for request interception.
Microsoft Kiota
Microsoft's API client generator that uses OpenAPI specs from APIs.guru to generate typed API clients in multiple languages.
Speakeasy
SDK generation platform that pulls OpenAPI definitions from the directory to generate production-ready SDKs for API providers.
ReDoc
API documentation generation tool that uses OpenAPI specs from APIs.guru to create beautiful, customizable documentation sites.
Open Collective
Community funding platform where APIs.guru receives financial support from sponsors who benefit from the open directory.
Resources
Every other property we hold for APIs.guru — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Build 10
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 10 ·
Access & Security 1
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/apis-guru · machine-readable index on apis.io
This is an independent, third-party profile of APIs.guru, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
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