jService

jService is an open source Ruby on Rails trivia API that serves approximately 200,000 Jeopardy! questions, answers, and categories scraped from the J! Archive fan site. The original public deployment at jservice.io is no longer operational, but the project (sottenad/jService, MIT licensed) remains available for self-hosting against PostgreSQL. The API exposes random clues, final Jeopardy clues, filtered clue queries, category listings, single-category lookup, and invalid-clue reporting under /api/*.

jService publishes 3 APIs on the APIs.io network: Categories API, Clues API, and Moderation API. Tagged areas include Games And Comics, Trivia, Jeopardy, Open-Source, and Ruby.

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

📡 Source on GitHub

18.3/100 emerging ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Games And Comics TriviaJeopardyOpen-Source Ruby Rails Public APIs

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 18.3/100 · emerging

Contract Quality 3.4 / 23

Developer Ergonomics 3.9 / 18

Access Clarity 0.0 / 18

Operational Transparency 0.6 / 12

Contract Governance 3.1 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/jservice: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

jService Categories API

Category collections of clues.

jService Clues API

Jeopardy! questions, answers, and metadata.

jService Moderation API

User-driven reporting of invalid clues.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

jService Trivia Categories API

OPEN COLLECTION

jService Trivia Categories Clues API

OPEN COLLECTION

jService Trivia Categories Moderation API

OPEN COLLECTION

jService Trivia API

OPEN COLLECTION

Semantic Vocabularies 1

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

Jservice Context

4 classes · 12 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

jService API Rules

5 rules · 4 warnings 1 info

SPECTRAL

jService API Rules

11 rules · 6 errors 5 warnings

SPECTRAL

JSON Schema 2

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

jService Category

6 properties

JSON SCHEMA

jService Clue

9 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Jservice Category Structure

5 properties

JSON STRUCTURE

Jservice Clue Structure

8 properties

JSON STRUCTURE

Examples 6

Example request and response payloads for these APIs.

Jservice Categories Example

4 fields

EXAMPLE

Jservice Category Example

4 fields

EXAMPLE

Jservice Clues Example

4 fields

EXAMPLE

Jservice Final Example

4 fields

EXAMPLE

Jservice Invalid Example

4 fields

EXAMPLE

Jservice Random Example

4 fields

EXAMPLE

Security Posture 1

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

Jservice Domain Security

no transport/DNS hardening detected

SECURITY

Agentic Access 1

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

Jservice Agentic Access

6 operations · 1 acting

AGENTIC

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

SourceCode

SourceCode

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

PublicAPIsListing

PublicAPIsListing

DataSource

DataSource

Source (apis.yml)

aid: jservice
name: jService
description: jService is an open source Ruby on Rails trivia API that serves approximately 200,000 Jeopardy! questions, answers,
  and categories scraped from the J! Archive fan site. The original public deployment at jservice.io is no longer operational,
  but the project (sottenad/jService, MIT licensed) remains available for self-hosting against PostgreSQL. The API exposes
  random clues, final Jeopardy clues, filtered clue queries, category listings, single-category lookup, and invalid-clue reporting
  under /api/*.
url: https://github.com/sottenad/jService
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - repository-unlicensed
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/957383?v=4
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-05-30'
x-source: public-apis/public-apis
x-category: Games & Comics
x-type: opensource
x-status: deprecated
x-status-reason: Original hosted endpoint at jservice.io is offline (parked / for-sale holding page). The open source project
  is unarchived and still maintainable; last push 2024-01-30.
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
x-governance: community
x-license: MIT
x-language: Ruby
x-data-source: J! Archive (j-archive.com)
tags:
- Games And Comics
- Trivia
- Jeopardy
- Open-Source
- Ruby
- Rails
- Public APIs
tags_raw:
- Games And Comics
- Trivia
- Jeopardy
- Open Source
- Ruby
- Rails
- Public APIs
apis:
- aid: jservice:jservice-categories-api
  name: jService Categories API
  description: Category collections of clues.
  humanURL: https://github.com/sottenad/jService
  baseURL: http://jservice.io
  tags:
  - Categories
  properties:
  - type: OpenAPI
    url: openapi/jservice-categories-api-openapi.yml
  - type: Documentation
    url: https://github.com/sottenad/jService#readme
  - type: SourceCode
    url: https://github.com/sottenad/jService
  - type: JSONSchema
    url: json-schema/jservice-clue-schema.json
  - type: JSONSchema
    url: json-schema/jservice-category-schema.json
  - type: JSONStructure
    url: json-structure/jservice-clue-structure.json
  - type: JSONStructure
    url: json-structure/jservice-category-structure.json
  - type: JSONLD
    url: json-ld/jservice-context.jsonld
  - type: SpectralRules
    url: rules/jservice-rules.yml
  - type: Examples
    url: examples/jservice-random-example.json
  - type: Vocabulary
    url: vocabulary/jservice-vocabulary.yml
  - type: Status
    url: https://jservice.io
  - type: License
    url: https://github.com/sottenad/jService/blob/master/LICENSE.txt
  - type: Authentication
    url: null
  - type: RateLimits
    url: null
- aid: jservice:jservice-clues-api
  name: jService Clues API
  description: Jeopardy! questions, answers, and metadata.
  humanURL: https://github.com/sottenad/jService
  baseURL: http://jservice.io
  tags:
  - Clues
  properties:
  - type: OpenAPI
    url: openapi/jservice-clues-api-openapi.yml
  - type: Documentation
    url: https://github.com/sottenad/jService#readme
  - type: SourceCode
    url: https://github.com/sottenad/jService
  - type: JSONSchema
    url: json-schema/jservice-clue-schema.json
  - type: JSONSchema
    url: json-schema/jservice-category-schema.json
  - type: JSONStructure
    url: json-structure/jservice-clue-structure.json
  - type: JSONStructure
    url: json-structure/jservice-category-structure.json
  - type: JSONLD
    url: json-ld/jservice-context.jsonld
  - type: SpectralRules
    url: rules/jservice-rules.yml
  - type: Examples
    url: examples/jservice-random-example.json
  - type: Vocabulary
    url: vocabulary/jservice-vocabulary.yml
  - type: Status
    url: https://jservice.io
  - type: License
    url: https://github.com/sottenad/jService/blob/master/LICENSE.txt
  - type: Authentication
    url: null
  - type: RateLimits
    url: null
- aid: jservice:jservice-moderation-api
  name: jService Moderation API
  description: User-driven reporting of invalid clues.
  humanURL: https://github.com/sottenad/jService
  baseURL: http://jservice.io
  tags:
  - Moderation
  properties:
  - type: OpenAPI
    url: openapi/jservice-moderation-api-openapi.yml
  - type: Documentation
    url: https://github.com/sottenad/jService#readme
  - type: SourceCode
    url: https://github.com/sottenad/jService
  - type: JSONSchema
    url: json-schema/jservice-clue-schema.json
  - type: JSONSchema
    url: json-schema/jservice-category-schema.json
  - type: JSONStructure
    url: json-structure/jservice-clue-structure.json
  - type: JSONStructure
    url: json-structure/jservice-category-structure.json
  - type: JSONLD
    url: json-ld/jservice-context.jsonld
  - type: SpectralRules
    url: rules/jservice-rules.yml
  - type: Examples
    url: examples/jservice-random-example.json
  - type: Vocabulary
    url: vocabulary/jservice-vocabulary.yml
  - type: Status
    url: https://jservice.io
  - type: License
    url: https://github.com/sottenad/jService/blob/master/LICENSE.txt
  - type: Authentication
    url: null
  - type: RateLimits
    url: null
common:
- type: IssueTracker
  url: https://github.com/sottenad/jService/issues
- type: AgenticAccess
  url: agentic-access/jservice-agentic-access.yml
- type: DomainSecurity
  url: security/jservice-domain-security.yml
- type: Website
  url: https://github.com/sottenad/jService
- type: SourceCode
  url: https://github.com/sottenad/jService
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
- type: License
  url: https://github.com/sottenad/jService/blob/master/LICENSE.txt
- type: DataSource
  url: https://j-archive.com
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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