Numbers API

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.

1 APIs 0 Features

NumbersTriviaMathFactsEducationFreeNo Auth

APIs

Numbers API

Retrieve interesting facts about numbers, mathematical properties, historical year events, and date-specific facts. Supports plain text and JSON response formats with no authent...

Pricing Plans

Numbers Api Plans Pricing

1 plans

PLANS

Rate Limits

Numbers Api Rate Limits

0 limits

RATE LIMITS

FinOps

Numbers Api Finops

FINOPS

Semantic Vocabularies

Numbers Api Context

5 classes · 6 properties

JSON-LD

Example Payloads

Batch Facts Json

4 fields

EXAMPLE

Date Fact Json

5 fields

EXAMPLE

Math Fact Json

4 fields

EXAMPLE

Trivia Fact Json

4 fields

EXAMPLE

Year Fact Json

5 fields

EXAMPLE

Resources

Sources

aid: numbers-api
name: Numbers API
description: '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.

  '
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
url: https://raw.githubusercontent.com/api-evangelist/numbers-api/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
type: Index
tags:
- Numbers
- Trivia
- Math
- Facts
- Education
- Free
- No Auth
apis:
- aid: numbers-api:numbers-api
  name: Numbers API
  description: 'Retrieve interesting facts about numbers, mathematical properties, historical year events, and date-specific
    facts. Supports plain text and JSON response formats with no authentication required.

    '
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: http://numbersapi.com
  humanURL: http://numbersapi.com
  tags:
  - Numbers
  - Trivia
  - Math
  - Year
  - Date
  - Facts
  properties:
  - type: Documentation
    url: http://numbersapi.com/#42
  - type: OpenAPI
    url: https://raw.githubusercontent.com/api-evangelist/numbers-api/refs/heads/main/openapi/numbers-api-openapi.yml
common:
- type: Website
  url: http://numbersapi.com
- type: Documentation
  url: http://numbersapi.com/#42
- type: GitHubOrg
  url: https://github.com/divad12
- type: LinkedIn
  url: https://www.linkedin.com/in/davidhu2000/
- type: Blog
  url: http://numbersapi.com
- type: Pricing
  url: http://numbersapi.com
- type: StatusPage
  url: http://numbersapi.com
- type: X
  url: https://x.com/numbersapi
- type: Plans
  url: plans/numbers-api-plans-pricing.yml
- type: RateLimits
  url: rate-limits/numbers-api-rate-limits.yml
- type: FinOps
  url: finops/numbers-api-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com