publicapis-io

PublicAPIs.io is a curated directory of over 1,000 free public APIs, offering developers searchable listings, detailed descriptions, and direct links to API documentation and endpoints. The platform aggregates APIs across categories such as data, finance, AI, and more, providing a community-driven resource for discovering and accessing open APIs without registration barriers.

publicapis-io is listed with 2 APIs on the APIs.io network. Tagged areas include Company, API Directory, Public APIs, Developer Resources, and Open Data.

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

publicapis-io’s developer surface includes documentation, engineering blog, API reference, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.4/100 thin Agent 19/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs 1 MCP Servers

Company API Directory Public APIsDeveloper ResourcesOpen Data

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 38.4/100 · thin

Contract Quality 9.7 / 21

Developer Ergonomics 4.9 / 17

Access Clarity 1.8 / 17

Operational Transparency 1.2 / 11

Contract Governance 8.1 / 10

Discoverability 5.7 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 10.5 — up to +17.9 composite points
Developer Ergonomics scores 28.6 — up to +14.3 composite points
Contract Quality scores 45.6 — up to +13.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/publicapis-io/apis.yml: open an issue on github.com/api-evangelist/publicapis-io to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

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

PublicAPIs.io MCP

MCP server providing tools to search and compare APIs.

publicapis-io API

publicapis-io API as documented publicly: 52 operations. Contract generated from the documentation by API Evangelist (2026-10-31); not the provider's own document.

MCP Servers 1

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

publicapis-io MCP Server

Remote MCP server at publicapis.io.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Publicapis Io Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Publicapis Io Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

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

Publicapis Io Context

37 classes · 17 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

publicapis-io API Rules

13 rules · 11 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

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

GetApiAllTheXResponse

2 properties

JSON SCHEMA

GetApiCatalogListResponse

2 properties

JSON SCHEMA

GetApiSpacecraftsResponse

1 properties

JSON SCHEMA

GetSeriesIdResponse

1 properties

JSON SCHEMA

PostApiUrlSubmitRequest

4 properties

JSON SCHEMA

PostV1ContractsRequest

2 properties

JSON SCHEMA

Security Posture 2

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

Publicapis Io Authentication

0 schemes

SECURITY

Publicapis Io Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Publicapis Io Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Newsroom

Newsroom

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: publicapis-io
name: publicapis-io
description: PublicAPIs.io is a curated directory of over 1,000 free public APIs, offering developers searchable listings,
  detailed descriptions, and direct links to API documentation and endpoints. The platform aggregates APIs across categories
  such as data, finance, AI, and more, providing a community-driven resource for discovering and accessing open APIs without
  registration barriers.
image: https://c1.tablecdn.com/pa/publicapis.png
url: https://artifacts.apis.io/publicapis-io/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Company
- API Directory
- Public APIs
- Developer Resources
- Open Data
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/publicapis-io-rules.yml
- type: JSONLD
  url: json-ld/publicapis-io-context.jsonld
- type: Vocabulary
  url: vocabulary/publicapis-io-vocabulary.yml
- type: DataModel
  url: data-model/publicapis-io-data-model.yml
- type: Conformance
  url: conformance/publicapis-io-conformance.yml
- type: LLMsTxt
  url: llms/publicapis-io-llms.txt
- type: ToolCrosswalk
  url: mcp/publicapis-io-tool-crosswalk.yml
- type: MCPServer
  url: mcp/publicapis-io-mcp.yml
- type: Hosts
  url: hosts/publicapis-io-hosts.yml
- type: Vendors
  url: vendors/publicapis-io-vendors.yml
- type: Security
  url: https://publicapis.io/category/security
- type: PrivacyPolicy
  url: https://publicapis.io/privacy.com-api
- type: Newsroom
  url: https://publicapis.io/category/news
- type: Documentation
  url: https://dev.publicapis.io/
- type: DomainSecurity
  url: security/publicapis-io-domain-security.yml
- type: Website
  url: https://publicapis.io/
- type: Blog
  url: https://publicapis.io/blog
- type: DeveloperPortal
  url: https://publicapis.io/mcp
- type: APIReference
  url: https://publicapis.io/serpapi-web-search-api
apis:
- name: PublicAPIs.io MCP
  description: MCP server providing tools to search and compare APIs.
  humanURL: https://publicapis.io/mcp
  baseURL: https://publicapis.io/mcp
  aid: publicapis-io:publicapis-io-mcp
- aid: publicapis-io:publicapis-io-api
  name: publicapis-io API
  description: 'publicapis-io API as documented publicly: 52 operations. Contract generated from the documentation by API
    Evangelist (2026-10-31);

    not the provider''s own document.'
  humanURL: https://publicapis.io/0x-api
  baseURL: https://api.fynk.com/v1
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/publicapis-io-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/publicapis-io-post-api-url-submit-request-schema.json
  - type: JSONSchema
    url: json-schema/publicapis-io-post-v1-contracts-request-schema.json
  - type: JSONSchema
    url: json-schema/publicapis-io-get-api-spacecrafts-response-schema.json
  - type: JSONSchema
    url: json-schema/publicapis-io-get-series-id-response-schema.json
  - type: JSONSchema
    url: json-schema/publicapis-io-get-api-all-the-xresponse-schema.json
  - type: JSONSchema
    url: json-schema/publicapis-io-get-api-catalog-list-response-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 33
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

publicapis-io — frequently asked questions

Does publicapis-io have an API?

Yes. APIs.io lists 2 APIs from publicapis-io, including PublicAPIs.io MCP and publicapis-io API.

Is there an OpenAPI specification for the publicapis-io?

Yes. APIs.io indexes 1 OpenAPI specification for publicapis-io, each linked for download from this page.

How do I authenticate with the publicapis-io?

publicapis-io documents its authentication (0 schemes). The details are profiled on APIs.io as Publicapis Io Authentication.

Does publicapis-io have an MCP server?

Yes. APIs.io lists 1 MCP server for publicapis-io: Remote MCP server at publicapis.io.

Is the publicapis-io ready for AI agents?

publicapis-io has a Kin Score of 38.4 out of 100 (thin) and an Agent Readiness score of 18.6 (agent-aware), scored by API Evangelist on 2026-10-31.

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 →

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How their score was established

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