# Open Trivia Database

**Canonical:** https://apis.io/providers/open-trivia/  
**Website:** https://opentdb.com  
**APIs profiled:** 4

The Open Trivia Database (OpenTDB) is a free, user-contributed trivia question database operated by Pixeltail Games LLC. It offers a JSON REST API for retrieving thousands of community-verified trivia questions across 24 categories and three difficulty levels, with optional session tokens to prevent duplicate questions. The service is licensed Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0), is free at the point of use, and enforces a single throttling rule: one request per IP every five seconds.

## Kin Score — 24.1 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 24.1).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 28.0 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 26.2 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Government & Public Sector**: 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

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (4)

- **Open Trivia Database Categories API** — Operations for discovering trivia category metadata and counts.
- **Open Trivia Database Questions API** — Operations for retrieving trivia questions from the database.
- **Open Trivia Database Statistics API** — Operations for inspecting overall database statistics.
- **Open Trivia Database Tokens API** — Operations for managing session tokens that prevent duplicate questions.

## Agentic access (1)

- **Open Trivia Agentic Access** — 5 operations

## Security (1)

- **Open Trivia Domain Security** — TLSv1.3 · HSTS

## Tags

Trivia, Games And Comics, Quiz, Open Data, Public APIs, Open-Source

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