Cat Facts API website screenshot

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
38.6/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreeOpen⚡ Free to try
3 APIs
Cat FactsTriviaFunLearningFree

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 38.6/100 · thin
Contract Quality 16.0 / 25
Developer Ergonomics 1.7 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 0.7 / 13
Governance 7.0 / 12
Discoverability 7.4 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 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 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

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.

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)

apis.yml Raw ↑ 
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.
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: '0.19'
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