Eclipse RDF4J

Eclipse RDF4J is a powerful open-source Java framework for processing and handling RDF data. It supports creating, parsing, scalable storage, reasoning, and querying with RDF and Linked Data, and ships with an HTTP server (RDF4J Server) and a web-based Workbench. The framework offers an easy-to-use Java API and SPARQL 1.1 support, and integrates with leading RDF database solutions.

Eclipse RDF4J publishes 6 API contracts indexed on the APIs.io network, including Namespaces API, Protocol API, Repositories API, and 3 more. Tagged areas include Eclipse Foundation, Java, Linked Data, Open Source, and RDF.

The Eclipse RDF4J catalog on APIs.io includes 1 Spectral governance ruleset.

Eclipse RDF4J’s developer surface includes getting-started guide, documentation, changelog, support, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.3/100 emerging ▬ flat Agent 19/100 agent aware Front door AI 1/6 silent Heartbeat 70/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 published contract

Eclipse Foundation Java Linked Data Open Source RDF Semantic Web SPARQLTriple Store

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 24.3/100 · emerging

Contract Quality 7.3 / 19

Developer Ergonomics 2.5 / 15

Access Clarity 1.0 / 15

Operational Transparency 3.5 / 10

Contract Governance 1.2 / 9

Discoverability 4.3 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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 Ask about this →
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) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 16.7 — up to +16.7 composite points Ask about this →
Contract Quality scores 39.1 — up to +15.2 composite points Ask about this →

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.

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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 the provider profile at artifacts.apis.io/eclipse-rdf4j/apis.yml: open an issue on github.com/api-evangelist/eclipse-rdf4j to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

RDF

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Eclipse RDF4J Namespaces API

Manage namespace prefix declarations.

Eclipse RDF4J Protocol API

Protocol version of the server.

Eclipse RDF4J Repositories API

Manage and inspect RDF repositories.

Eclipse RDF4J Transactions API

Group multiple operations in an atomic transaction.

Eclipse RDF4J Graph Store API

The [SPARQL 1.1 Graph Store HTTP Protocol](https://www.w3.org/TR/sparql11-http-rdf-update/) is supported on a per-repository basis. The functionality is accessible at the /repos...

Eclipse RDF4J SPARQL API

SPARQL Query and Update execution

Open Collections 8

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

RDF4J Server REST Contexts API

OPEN COLLECTION

RDF4J Server REST Contexts Namespaces API

OPEN COLLECTION

RDF4J Server REST Contexts Protocol API

OPEN COLLECTION

RDF4J Server REST Contexts Repositories API

OPEN COLLECTION

RDF4J Server REST Contexts Size API

OPEN COLLECTION

RDF4J Server REST Contexts Statements API

OPEN COLLECTION

RDF4J Server REST Contexts Transactions API

OPEN COLLECTION

RDF4J Server REST API

OPEN COLLECTION

Scroll for all 8

Eclipse RDF4J API pricing

Not yet checked against Eclipse RDF4J's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Eclipse RDF4J's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Eclipse RDF4J Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Eclipse RDF4J Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Eclipse RDF4J Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Eclipse RDF4J API Rules

46 rules · 37 error-severity 7 warn-severity 2 info-severity

SPECTRAL

Security Posture 1

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

Eclipse RDF4J Domain Security

TLSv1.3

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Eclipse RDF4J Agentic Access

24 operations · 14 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

Tutorials

Tutorials

Operate 5

Status, limits, changes, and where to get help

RateLimits

Releases

ChangeLog

Issues

Support

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: eclipse-rdf4j
name: Eclipse RDF4J
description: Eclipse RDF4J is a powerful open-source Java framework for processing and handling RDF data. It supports creating,
  parsing, scalable storage, reasoning, and querying with RDF and Linked Data, and ships with an HTTP server (RDF4J Server)
  and a web-based Workbench. The framework offers an easy-to-use Java API and SPARQL 1.1 support, and integrates with leading
  RDF database solutions.
type: Index
deliveryModel:
  model: unknown
  license_evidence:
    not_product:
    - eclipse/rdf4j
  open_source: unknown
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  try_now_blocked_by: loopback
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/eclipse-rdf4j.png
url: https://raw.githubusercontent.com/api-evangelist/eclipse-rdf4j/refs/heads/main/apis.yml
tags:
- Eclipse Foundation
- Java
- Linked Data
- Open Source
- RDF
- Semantic Web
- SPARQL
- Triple Store
tags_raw:
- Eclipse Foundation
- Java
- Linked Data
- Open Source
- RDF
- Semantic Web
- SPARQL
- Triple Store
- Open-Source
created: '2024-01-01'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: eclipse-rdf4j:eclipse-rdf4j-namespaces-api
  name: Eclipse RDF4J Namespaces API
  description: Manage namespace prefix declarations.
  humanURL: https://rdf4j.org/documentation/reference/rest-api/
  baseURL: http://localhost:8080/rdf4j-server
  tags:
  - Namespaces
  properties:
  - type: OpenAPI
    url: openapi/eclipse-rdf4j-namespaces-api-openapi.yml
  - type: Documentation
    url: https://rdf4j.org/documentation/reference/rest-api/
  - type: GettingStarted
    url: https://rdf4j.org/documentation/programming/getting-started/
  - type: Repository
    url: https://github.com/eclipse/rdf4j
- aid: eclipse-rdf4j:eclipse-rdf4j-protocol-api
  name: Eclipse RDF4J Protocol API
  description: Protocol version of the server.
  humanURL: https://rdf4j.org/documentation/reference/rest-api/
  baseURL: http://localhost:8080/rdf4j-server
  tags:
  - Protocol
  properties:
  - type: OpenAPI
    url: openapi/eclipse-rdf4j-protocol-api-openapi.yml
  - type: Documentation
    url: https://rdf4j.org/documentation/reference/rest-api/
  - type: GettingStarted
    url: https://rdf4j.org/documentation/programming/getting-started/
  - type: Repository
    url: https://github.com/eclipse/rdf4j
- aid: eclipse-rdf4j:eclipse-rdf4j-repositories-api
  name: Eclipse RDF4J Repositories API
  description: Manage and inspect RDF repositories.
  humanURL: https://rdf4j.org/documentation/reference/rest-api/
  baseURL: http://localhost:8080/rdf4j-server
  tags:
  - Repositories
  properties:
  - type: OpenAPI
    url: openapi/eclipse-rdf4j-repositories-api-openapi.yml
  - type: Documentation
    url: https://rdf4j.org/documentation/reference/rest-api/
  - type: GettingStarted
    url: https://rdf4j.org/documentation/programming/getting-started/
  - type: Repository
    url: https://github.com/eclipse/rdf4j
- aid: eclipse-rdf4j:eclipse-rdf4j-transactions-api
  name: Eclipse RDF4J Transactions API
  description: Group multiple operations in an atomic transaction.
  humanURL: https://rdf4j.org/documentation/reference/rest-api/
  baseURL: http://localhost:8080/rdf4j-server
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/eclipse-rdf4j-transactions-api-openapi.yml
  - type: Documentation
    url: https://rdf4j.org/documentation/reference/rest-api/
  - type: GettingStarted
    url: https://rdf4j.org/documentation/programming/getting-started/
  - type: Repository
    url: https://github.com/eclipse/rdf4j
- aid: eclipse-rdf4j:eclipse-rdf4j-graph-store-api
  name: Eclipse RDF4J Graph Store API
  description: The [SPARQL 1.1 Graph Store HTTP Protocol](https://www.w3.org/TR/sparql11-http-rdf-update/) is supported on
    a per-repository basis. The functionality is accessible at the /repositories/<ID>/rdf-graphs/service endpoint (for indirectly
    referenced named graphs), and at /repositories/<ID>/rdf-graphs/<NAME> for directly referenced named graphs. A request
    on a directly referenced named graph entails that the request URL itself is used as the named graph identifier in the
    repository.
  humanURL: https://rdf4j.org/documentation/reference/rest-api/
  baseURL: http://localhost:8080/rdf4j-server
  tags:
  - Graph Store
  properties:
  - type: OpenAPI
    url: openapi/eclipse-rdf4j-graph-store-api-openapi.yml
  - type: Documentation
    url: https://rdf4j.org/documentation/reference/rest-api/
  - type: GettingStarted
    url: https://rdf4j.org/documentation/programming/getting-started/
  - type: Repository
    url: https://github.com/eclipse/rdf4j
- aid: eclipse-rdf4j:eclipse-rdf4j-sparql-api
  name: Eclipse RDF4J SPARQL API
  description: SPARQL Query and Update execution
  humanURL: https://rdf4j.org/documentation/reference/rest-api/
  baseURL: http://localhost:8080/rdf4j-server
  tags:
  - SPARQL
  properties:
  - type: OpenAPI
    url: openapi/eclipse-rdf4j-sparql-api-openapi.yml
  - type: Documentation
    url: https://rdf4j.org/documentation/reference/rest-api/
  - type: GettingStarted
    url: https://rdf4j.org/documentation/programming/getting-started/
  - type: Repository
    url: https://github.com/eclipse/rdf4j
common:
- type: Plans
  url: plans/eclipse-rdf4j-plans-pricing.yml
- type: RateLimits
  url: rate-limits/eclipse-rdf4j-rate-limits.yml
- type: FinOps
  url: finops/eclipse-rdf4j-finops.yml
- type: Website
  url: https://www.rdf4j.org/
- type: Releases
  url: https://github.com/eclipse/rdf4j/releases
- type: SecurityPolicy
  url: https://github.com/eclipse-rdf4j/rdf4j/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/eclipse-rdf4j/rdf4j/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/eclipse-rdf4j/rdf4j/blob/main/CONTRIBUTING.md
- type: AgenticAccess
  url: agentic-access/eclipse-rdf4j-agentic-access.yml
- type: DomainSecurity
  url: security/eclipse-rdf4j-domain-security.yml
- type: GettingStarted
  url: https://rdf4j.org/documentation/programming/getting-started/
- type: Documentation
  url: https://rdf4j.org/documentation/
- type: Tutorials
  url: https://rdf4j.org/documentation/tutorials/
- type: ChangeLog
  url: https://rdf4j.org/release-notes/
- type: Issues
  url: https://github.com/eclipse/rdf4j/issues
- type: Support
  url: https://github.com/eclipse/rdf4j/discussions
- type: GitHubOrganization
  url: https://github.com/eclipse/rdf4j
- type: License
  url: https://github.com/eclipse/rdf4j/blob/main/LICENSE.md
- type: Blog
  url: https://rdf4j.org/index.xml
maintainers:
- FN: Eclipse Foundation
  email: rdf4j-dev@eclipse.org

Eclipse RDF4J API — frequently asked questions

Does Eclipse RDF4J have an API?

Yes. APIs.io lists 6 APIs from Eclipse RDF4J, including Eclipse RDF4J Namespaces API, Eclipse RDF4J Protocol API and Eclipse RDF4J Repositories API, and 3 more.

Is there an OpenAPI specification for the Eclipse RDF4J API?

Yes. APIs.io indexes 6 OpenAPI specifications for Eclipse RDF4J, each linked for download from this page.

How much does the Eclipse RDF4J API cost?

APIs.io lists 3 pricing plans for Eclipse RDF4J, with each plan's price, limits and inclusions under Pricing on this page.

Is the Eclipse RDF4J API ready for AI agents?

Eclipse RDF4J has a Kin Score of 24.3 out of 100 (emerging) and an Agent Readiness score of 18.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
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