# Numbers API

**Canonical:** https://apis.io/providers/numbers-api/  
**Website:** http://numbersapi.com  
**APIs profiled:** 6

Free REST API providing interesting mathematical facts, trivia, dates, and year facts about numbers for educational and fun applications. Returns short, readable facts about any number or date across four categories: trivia, mathematical properties, notable years, and day-of-year historical events. No authentication or API key required.

## Kin Score — 31.7 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 31.7).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 57.6 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 13.2 |
| Developer Ergonomics | 6.0 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

Regulatory layer — **Education & Research**: 20.4 (matched via tags).

## Agent readiness — 31.6 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Free · Open access — onboarding: open, pricing: free, trial: no (confidence: medium).

## APIs (6)

- **Numbers API Date API** — The Date API from Numbers API — 1 operation(s) for date.
- **Numbers API Math API** — The Math API from Numbers API — 1 operation(s) for math.
- **Numbers API Numbers API API** — The Numbers API API from Numbers API — 1 operation(s) for numbers api.
- **Numbers API Random API** — The Random API from Numbers API — 4 operation(s) for random.
- **Numbers API Trivia API** — The Trivia API from Numbers API — 1 operation(s) for trivia.
- **Numbers API Year API** — The Year API from Numbers API — 1 operation(s) for year.

## Agentic access (1)

- **Numbers Api Agentic Access** — 9 operations

## Security (1)

- **Numbers Api Domain Security** — TLSv1.3 · HSTS

## Plans (1)

- **Numbers Api Plans Pricing**

## Tags

Numbers, Trivia, Math, Facts, Education, Free, No Auth

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/numbers-api/). Scores are computed from the provider's own public artifacts under a published rubric.