Open Trivia Database

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.

Open Trivia Database is listed with 4 APIs on the APIs.io network, including Categories API, Questions API, Statistics API, and 1 more. Tagged areas include Trivia, Quiz, Open Data, Public APIs, and Open Source.

The Open Trivia Database catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Open Trivia Database’s developer surface includes documentation, support, tooling, code examples, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.8/100 emerging ▬ flat Agent 26/100 agent aware saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

4 APIs

Trivia Quiz Open Data Public APIs Open Source

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 25.8/100 · emerging

Contract Quality 6.3 / 21

Developer Ergonomics 4.5 / 17

Access Clarity 2.2 / 17

Operational Transparency 0.6 / 11

Contract Governance 2.8 / 10

Discoverability 5.9 / 9

Regulatory Posture 1.6 / 15

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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 29.6 — up to +17.6 composite points
Access Clarity scores 13.2 — up to +17.4 composite points
Developer Ergonomics scores 26.2 — up to +14.8 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

OPEN COLLECTION

Open Trivia Database API

OPEN COLLECTION

Open Trivia Database API pricing

Rate limits

Per-IP global throttle: 0.2 requests per second

Compiled by API Evangelist, not yet checked against Open Trivia Database's documentation. Rate-limit details →

Rate Limits 1

Documented rate limits and quota policies.

Open Trivia Rate Limits

1 limits

RATE LIMITS

Semantic Vocabularies 1

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

Open Trivia Context

9 classes · 25 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Open Trivia Database — jsonschema rules

5 rules · 4 warnings 1 info

SPECTRAL

Open Trivia Database API Rules

36 rules · 12 errors 18 warnings 6 info

SPECTRAL

JSON Schema 9

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

CategoryCountResponse

2 properties

JSON SCHEMA

CategoryListResponse

1 properties

JSON SCHEMA

CategoryQuestionCount

3 properties

JSON STRUCTURE

Scroll for all 9

2 fields

EXAMPLE

Open Trivia Token Response Example

3 fields

EXAMPLE

Scroll for all 9

Security Posture 1

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

Open Trivia Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Open Trivia Agentic Access

5 operations

5 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 11

SDKs, sample code, and the tooling you integrate with

Community SDKs and Integrations

CommunityIntegrations

Open Trivia DB Wrapper (TypeScript / JavaScript)

SDKs

Python Trivia API (Python)

SDKs

OpenTDB4j (Java)

SDKs

opentdb-api (JavaScript)

SDKs

MCP Server (Community — pipeworx-io)

Tools

Discord Trivia Bot (Community)

Tools

OTDB Source Download Script (Community)

Tools

Ignite Bowser Trivia App (TypeScript)

CodeExamples

React Native Trivia Quiz (JavaScript)

CodeExamples

Vue Quiz App (Vue 3)

CodeExamples

Scroll for all 11

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

License

License

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Donate

Donate

PublicAPIsListing

PublicAPIsListing

Source (apis.yml)

aid: open-trivia
name: Open Trivia Database
description: '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.'
url: https://opentdb.com/api_config.php
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://opentdb.com/images/logo-banner.png
humanURL: https://opentdb.com
baseURL: https://opentdb.com
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-05-30'
x-source: public-apis/public-apis
x-artifacts:
  openapi: 1
  jsonSchema: 9
  jsonStructure: 9
  jsonLd: 1
  examples: 9
  capabilities: 4
  rules: 1
  vocabulary: 1
  rateLimits: 1
x-category: Games & Comics
x-type: opensource
x-tier: 3
x-tier-reason: Free public service; user-contributed open database with CC BY-SA 4.0 licensing.
x-license: CC-BY-SA-4.0
x-operator: Pixeltail Games LLC
tags:
- Trivia
- Quiz
- Open Data
- Public APIs
- Open Source
tags_raw:
- Trivia
- Quiz
- Open Data
- Public APIs
- Open Source
- Open-Source
apis:
- aid: open-trivia:open-trivia-categories-api
  name: Open Trivia Database Categories API
  description: Operations for discovering trivia category metadata and counts.
  humanURL: https://opentdb.com/api_config.php
  tags:
  - Categories
  properties:
  - type: OpenAPI
    url: openapi/open-trivia-categories-api-openapi.yml
  - type: Documentation
    url: https://opentdb.com/api_config.php
  - type: JSONSchema
    url: json-schema/open-trivia-question-schema.json
  - type: JSONSchema
    url: json-schema/open-trivia-category-schema.json
  - type: JSONStructure
    url: json-structure/open-trivia-question-structure.json
  - type: JSONLD
    url: json-ld/open-trivia-context.jsonld
  - type: SpectralRules
    url: rules/open-trivia-rules.yml
  - type: RateLimits
    url: rate-limits/open-trivia-rate-limits.yml
  - type: Vocabulary
    url: vocabulary/open-trivia-vocabulary.yml
  - type: Examples
    url: examples/open-trivia-question-response-example.json
  - type: Signup
    url: https://opentdb.com/api_config.php
  - type: ContributeQuestions
    url: https://opentdb.com/contribute.php
  - type: BrowseQuestions
    url: https://opentdb.com/browse.php
  - type: GameLink
    url: https://opentdb.com/game.php
  - type: Statistics
    url: https://opentdb.com/api_count_global.php
- aid: open-trivia:open-trivia-questions-api
  name: Open Trivia Database Questions API
  description: Operations for retrieving trivia questions from the database.
  humanURL: https://opentdb.com/api_config.php
  tags:
  - Questions
  properties:
  - type: OpenAPI
    url: openapi/open-trivia-questions-api-openapi.yml
  - type: Documentation
    url: https://opentdb.com/api_config.php
  - type: JSONSchema
    url: json-schema/open-trivia-question-schema.json
  - type: JSONSchema
    url: json-schema/open-trivia-category-schema.json
  - type: JSONStructure
    url: json-structure/open-trivia-question-structure.json
  - type: JSONLD
    url: json-ld/open-trivia-context.jsonld
  - type: SpectralRules
    url: rules/open-trivia-rules.yml
  - type: RateLimits
    url: rate-limits/open-trivia-rate-limits.yml
  - type: Vocabulary
    url: vocabulary/open-trivia-vocabulary.yml
  - type: Examples
    url: examples/open-trivia-question-response-example.json
  - type: Signup
    url: https://opentdb.com/api_config.php
  - type: ContributeQuestions
    url: https://opentdb.com/contribute.php
  - type: BrowseQuestions
    url: https://opentdb.com/browse.php
  - type: GameLink
    url: https://opentdb.com/game.php
  - type: Statistics
    url: https://opentdb.com/api_count_global.php
- aid: open-trivia:open-trivia-statistics-api
  name: Open Trivia Database Statistics API
  description: Operations for inspecting overall database statistics.
  humanURL: https://opentdb.com/api_config.php
  tags:
  - Statistics
  properties:
  - type: OpenAPI
    url: openapi/open-trivia-statistics-api-openapi.yml
  - type: Documentation
    url: https://opentdb.com/api_config.php
  - type: JSONSchema
    url: json-schema/open-trivia-question-schema.json
  - type: JSONSchema
    url: json-schema/open-trivia-category-schema.json
  - type: JSONStructure
    url: json-structure/open-trivia-question-structure.json
  - type: JSONLD
    url: json-ld/open-trivia-context.jsonld
  - type: SpectralRules
    url: rules/open-trivia-rules.yml
  - type: RateLimits
    url: rate-limits/open-trivia-rate-limits.yml
  - type: Vocabulary
    url: vocabulary/open-trivia-vocabulary.yml
  - type: Examples
    url: examples/open-trivia-question-response-example.json
  - type: Signup
    url: https://opentdb.com/api_config.php
  - type: ContributeQuestions
    url: https://opentdb.com/contribute.php
  - type: BrowseQuestions
    url: https://opentdb.com/browse.php
  - type: GameLink
    url: https://opentdb.com/game.php
  - type: Statistics
    url: https://opentdb.com/api_count_global.php
- aid: open-trivia:open-trivia-tokens-api
  name: Open Trivia Database Tokens API
  description: Operations for managing session tokens that prevent duplicate questions.
  humanURL: https://opentdb.com/api_config.php
  tags:
  - Tokens
  properties:
  - type: OpenAPI
    url: openapi/open-trivia-tokens-api-openapi.yml
  - type: Documentation
    url: https://opentdb.com/api_config.php
  - type: JSONSchema
    url: json-schema/open-trivia-question-schema.json
  - type: JSONSchema
    url: json-schema/open-trivia-category-schema.json
  - type: JSONStructure
    url: json-structure/open-trivia-question-structure.json
  - type: JSONLD
    url: json-ld/open-trivia-context.jsonld
  - type: SpectralRules
    url: rules/open-trivia-rules.yml
  - type: RateLimits
    url: rate-limits/open-trivia-rate-limits.yml
  - type: Vocabulary
    url: vocabulary/open-trivia-vocabulary.yml
  - type: Examples
    url: examples/open-trivia-question-response-example.json
  - type: Signup
    url: https://opentdb.com/api_config.php
  - type: ContributeQuestions
    url: https://opentdb.com/contribute.php
  - type: BrowseQuestions
    url: https://opentdb.com/browse.php
  - type: GameLink
    url: https://opentdb.com/game.php
  - type: Statistics
    url: https://opentdb.com/api_count_global.php
common:
- type: RateLimits
  url: rate-limits/open-trivia-rate-limits.yml
- type: AgenticAccess
  url: agentic-access/open-trivia-agentic-access.yml
- type: DomainSecurity
  url: security/open-trivia-domain-security.yml
- type: Website
  url: https://opentdb.com
- type: Documentation
  url: https://opentdb.com/api_config.php
- type: Support
  url: https://opentdb.com/contact.php
- type: TermsOfService
  url: https://opentdb.com/terms.php
- type: License
  url: https://creativecommons.org/licenses/by-sa/4.0/
- type: Donate
  url: https://ko-fi.com/pixeltailgames
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
- type: CommunityIntegrations
  title: Community SDKs and Integrations
  url: https://github.com/topics/opentdb
- type: SDKs
  title: Open Trivia DB Wrapper (TypeScript / JavaScript)
  url: https://github.com/Elitezen/open-trivia-db-wrapper
- type: SDKs
  title: Python Trivia API (Python)
  url: https://github.com/MaT1g3R/Python-Trivia-API
- type: SDKs
  title: OpenTDB4j (Java)
  url: https://github.com/crnvl/OpenTDB4j
- type: SDKs
  title: opentdb-api (JavaScript)
  url: https://github.com/blobfysh/opentdb-api
- type: Tools
  title: MCP Server (Community — pipeworx-io)
  url: https://github.com/pipeworx-io/mcp-trivia
- type: Tools
  title: Discord Trivia Bot (Community)
  url: https://github.com/LakeYS/Discord-Trivia-Bot
- type: Tools
  title: OTDB Source Download Script (Community)
  url: https://github.com/QuartzWarrior/OTDB-Source
- type: CodeExamples
  title: Ignite Bowser Trivia App (TypeScript)
  url: https://github.com/robinheinze/ignite-trivia
- type: CodeExamples
  title: React Native Trivia Quiz (JavaScript)
  url: https://github.com/computationalcore/react-native-trivia-quiz
- type: CodeExamples
  title: Vue Quiz App (Vue 3)
  url: https://github.com/supershaneski/vue-quiz-app
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-tags-removed:
- Games And Comics

Open Trivia Database API — frequently asked questions

Does Open Trivia Database have an API?

Yes. APIs.io lists 4 APIs from Open Trivia Database, including Open Trivia Database Categories API, Open Trivia Database Questions API and Open Trivia Database Statistics API, and 1 more.

Is there an OpenAPI specification for the Open Trivia Database API?

Yes. APIs.io indexes 4 OpenAPI specifications for Open Trivia Database, each linked for download from this page.

Is the Open Trivia Database API ready for AI agents?

Open Trivia Database has a Kin Score of 25.8 out of 100 (emerging) and an Agent Readiness score of 25.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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