Cat Facts API

Free REST API providing random cat facts, breed information, and cat-related trivia for developers building fun applications and learning APIs. No authentication required; CORS enabled for frontend use. Endpoints return paginated JSON data with configurable limits and max-length filters.

Cat Facts API publishes 3 APIs on the APIs.io network: Breeds API, Fact API, and Facts API. Tagged areas include Cat Facts, Trivia, Fun, Learning, and Free.

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

Cat Facts API’s developer surface includes documentation and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.1/100 thin ▬ flat Agent 26/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreeOpen⚡ Free to try

1 APIs

Cat FactsTriviaFunLearning Free

Kin Score

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

Composite quality — 31.1/100 · thin

Contract Quality 14.7 / 25

Developer Ergonomics 1.9 / 20

Access Clarity 5.8 / 20

Operational Transparency 0.7 / 13

Contract Governance 1.2 / 12

Discoverability 6.9 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 4 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/catfact: 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 3

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

Cat Facts API Breeds API

The Breeds API from Cat Facts API — 1 operation(s) for breeds.

Cat Facts API Fact API

The Fact API from Cat Facts API — 1 operation(s) for fact.

Cat Facts API Facts API

The Facts API from Cat Facts API — 1 operation(s) for facts.

Open Collections 4

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

API Collection

OPEN COLLECTION

Cat Facts Breeds API

OPEN COLLECTION

Cat Facts Breeds Fact API

OPEN COLLECTION

Cat Breeds Facts API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Catfact Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Catfact Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Catfact Finops

FINOPS

Semantic Vocabularies 1

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

context Context

2 classes · 19 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Cat Facts API API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 4

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

BreedList

12 properties

JSON SCHEMA

Breed

5 properties

JSON SCHEMA

FactList

12 properties

JSON SCHEMA

Fact

2 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Breeds List Response

12 fields

EXAMPLE

Fact Response

2 fields

EXAMPLE

Facts List Response

12 fields

EXAMPLE

Security Posture 1

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

Catfact Domain Security

TLSv1.3

SECURITY

Agentic Access 1

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

Catfact Agentic Access

3 operations

3 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: catfact
name: Cat Facts API
description: Free REST API providing random cat facts, breed information, and cat-related trivia for developers building fun
  applications and learning APIs. No authentication required; CORS enabled for frontend use. Endpoints return paginated JSON
  data with configurable limits and max-length filters.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Free · Open access
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/catfact.png
url: https://raw.githubusercontent.com/api-evangelist/catfact/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Cat Facts
- Trivia
- Fun
- Learning
- Free
apis:
- aid: catfact:catfact-breeds-api
  name: Cat Facts API Breeds API
  description: The Breeds API from Cat Facts API — 1 operation(s) for breeds.
  humanURL: https://catfact.ninja/
  baseURL: https://catfact.ninja
  tags:
  - Breeds
  properties:
  - type: OpenAPI
    url: openapi/catfact-breeds-api-openapi.yml
  - type: Documentation
    url: https://catfact.ninja/
- aid: catfact:catfact-fact-api
  name: Cat Facts API Fact API
  description: The Fact API from Cat Facts API — 1 operation(s) for fact.
  humanURL: https://catfact.ninja/
  baseURL: https://catfact.ninja
  tags:
  - Fact
  properties:
  - type: OpenAPI
    url: openapi/catfact-fact-api-openapi.yml
  - type: Documentation
    url: https://catfact.ninja/
- aid: catfact:catfact-facts-api
  name: Cat Facts API Facts API
  description: The Facts API from Cat Facts API — 1 operation(s) for facts.
  humanURL: https://catfact.ninja/
  baseURL: https://catfact.ninja
  tags:
  - Facts
  properties:
  - type: OpenAPI
    url: openapi/catfact-facts-api-openapi.yml
  - type: Documentation
    url: https://catfact.ninja/
common:
- type: AgenticAccess
  url: agentic-access/catfact-agentic-access.yml
- type: DomainSecurity
  url: security/catfact-domain-security.yml
- type: Website
  url: https://catfact.ninja/
- type: Documentation
  url: https://catfact.ninja/
- type: GitHubOrg
  url: https://github.com/alexwohlbruck/cat-facts
- type: Plans
  url: plans/catfact-plans-pricing.yml
- type: RateLimits
  url: rate-limits/catfact-rate-limits.yml
- type: FinOps
  url: finops/catfact-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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