Clojars

Clojars is a community repository for open source Clojure libraries, providing a REST API for searching artifacts, retrieving version information, accessing user and group data, and managing deployment credentials via deploy tokens.

Clojars publishes 5 API contracts indexed on the APIs.io network, including Artifacts API, Feeds API, Groups API, and 2 more. Tagged areas include Clojure, Package Registry, Artifact Repository, and Open Source.

The Clojars catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Clojars’ developer surface includes authentication and 14 more developer resources.

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28.7/100 thin ▬ flat Agent 25/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive self hosted · EPL-1.0 Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract

ClojurePackage Registry Artifact Repository Open Source

Kin Score

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

Composite quality — 28.7/100 · thin

Contract Quality 11.4 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 0.0 / 17

Operational Transparency 3.2 / 11

Contract Governance 1.0 / 10

Discoverability 5.0 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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 0 / 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 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
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)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 21.4 — up to +15.7 composite points
Contract Quality scores 53.6 — up to +11.6 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.

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/clojars/apis.yml: open an issue on github.com/api-evangelist/clojars 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
GitHub Marketplace (GitHub-native publisher layer)	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 5

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

Clojars Artifacts API

Operations related to Clojars artifacts and releases

Clojars Feeds API

Release feed and bulk data operations

Clojars Groups API

Operations related to Clojars artifact groups

Clojars Search API

Search operations across the Clojars artifact index

Clojars Users API

Operations related to Clojars user profiles and group memberships

Open Collections 5

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

Clojars REST Artifacts API

OPEN COLLECTION

Clojars REST Artifacts Feeds API

OPEN COLLECTION

Clojars REST Artifacts Groups API

OPEN COLLECTION

Clojars REST Artifacts Search API

OPEN COLLECTION

Clojars REST Artifacts Users API

OPEN COLLECTION

Clojars API pricing

Rate limits

: undocumented

Compiled by API Evangelist, not yet checked against Clojars's documentation. All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Free

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Default

4 limits

RATE LIMITS

FinOps 1

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

Overview

FINOPS

Semantic Vocabularies 1

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

context Context

0 classes · 17 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Clojars — jsonschema rules

6 rules · 5 warnings 1 info

SPECTRAL

JSON Schema 3

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

Artifact

9 properties

JSON SCHEMA

ReleaseFeed

2 properties

JSON SCHEMA

User

2 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Get Artifact By Group

9 fields

EXAMPLE

Get Release Feed

2 fields

EXAMPLE

Get User

2 fields

EXAMPLE

Search Artifacts

2 fields

EXAMPLE

Security Posture 2

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

Clojars Authentication

http · 1 scheme

SECURITY

Clojars Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Clojars Agentic Access

9 operations

9 operations · 0 acting

AGENTIC

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

GitHubRepo

GitHubRepo

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

Wiki

Wiki

MavenRepository

MavenRepository

Sponsor

Sponsor

Source (apis.yml)

name: Clojars
description: Clojars is a community repository for open source Clojure libraries, providing a REST API for searching artifacts,
  retrieving version information, accessing user and group data, and managing deployment credentials via deploy tokens.
deliveryModel:
  model: self-hosted
  license: EPL-1.0
  open_source: true
  commercial: false
  callable_host: true
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://clojars.org/images/clojars-logo.png
url: https://clojars.org/
tags:
- Clojure
- Package Registry
- Artifact Repository
- Open Source
tags_raw:
- Clojure
- Package Registry
- Artifact Repository
- Open Source
- Open-Source
created: '2026-06-13'
modified: '2026-09-16'
specificationVersion: '0.23'
apis:
- aid: clojars:clojars-artifacts-api
  name: Clojars Artifacts API
  description: Operations related to Clojars artifacts and releases
  humanURL: https://github.com/clojars/clojars-web/wiki/Data
  baseURL: https://clojars.org/api
  tags:
  - Artifacts
  properties:
  - type: OpenAPI
    url: openapi/clojars-artifacts-api-openapi.yml
  - type: Documentation
    url: https://github.com/clojars/clojars-web/wiki/Data
  - type: Authentication
    url: https://github.com/clojars/clojars-web/wiki/Deploy-Tokens
- aid: clojars:clojars-feeds-api
  name: Clojars Feeds API
  description: Release feed and bulk data operations
  humanURL: https://github.com/clojars/clojars-web/wiki/Data
  baseURL: https://clojars.org/api
  tags:
  - Feed
  tags_raw:
  - Feeds
  properties:
  - type: OpenAPI
    url: openapi/clojars-feeds-api-openapi.yml
  - type: Documentation
    url: https://github.com/clojars/clojars-web/wiki/Data
  - type: Authentication
    url: https://github.com/clojars/clojars-web/wiki/Deploy-Tokens
- aid: clojars:clojars-groups-api
  name: Clojars Groups API
  description: Operations related to Clojars artifact groups
  humanURL: https://github.com/clojars/clojars-web/wiki/Data
  baseURL: https://clojars.org/api
  tags:
  - Group
  tags_raw:
  - Groups
  properties:
  - type: OpenAPI
    url: openapi/clojars-groups-api-openapi.yml
  - type: Documentation
    url: https://github.com/clojars/clojars-web/wiki/Data
  - type: Authentication
    url: https://github.com/clojars/clojars-web/wiki/Deploy-Tokens
- aid: clojars:clojars-search-api
  name: Clojars Search API
  description: Search operations across the Clojars artifact index
  humanURL: https://github.com/clojars/clojars-web/wiki/Data
  baseURL: https://clojars.org/api
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/clojars-search-api-openapi.yml
  - type: Documentation
    url: https://github.com/clojars/clojars-web/wiki/Data
  - type: Authentication
    url: https://github.com/clojars/clojars-web/wiki/Deploy-Tokens
- aid: clojars:clojars-users-api
  name: Clojars Users API
  description: Operations related to Clojars user profiles and group memberships
  humanURL: https://github.com/clojars/clojars-web/wiki/Data
  baseURL: https://clojars.org/api
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/clojars-users-api-openapi.yml
  - type: Documentation
    url: https://github.com/clojars/clojars-web/wiki/Data
  - type: Authentication
    url: https://github.com/clojars/clojars-web/wiki/Deploy-Tokens
common:
- type: Plans
  url: plans/free.yml
- type: RateLimits
  url: rate-limits/default.yml
- type: FinOps
  url: finops/overview.yml
- type: Website
  url: https://clojars.org
- type: IssueTracker
  url: https://github.com/clojars/clojars-web/issues
- type: License
  name: EPL-1.0
  url: https://github.com/clojars/clojars-web/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/clojars-agentic-access.yml
- type: DomainSecurity
  url: security/clojars-domain-security.yml
- type: Authentication
  url: authentication/clojars-authentication.yml
- type: StatusPage
  url: https://clojars.statuspage.io
- type: GitHubOrg
  url: https://github.com/clojars
- type: GitHubRepo
  url: https://github.com/clojars/clojars-web
- type: Wiki
  url: https://github.com/clojars/clojars-web/wiki
- type: MavenRepository
  url: https://repo.clojars.org
- type: Sponsor
  url: https://www.clojuriststogether.org/
maintainers:
- FN: Clojurists Together
  url: https://www.clojuriststogether.org/

Clojars API — frequently asked questions

Does Clojars have an API?

Yes. APIs.io lists 5 APIs from Clojars, including Clojars Artifacts API, Clojars Feeds API and Clojars Groups API, and 2 more.

Is there an OpenAPI specification for the Clojars API?

Yes. APIs.io indexes 5 OpenAPI specifications for Clojars, each linked for download from this page.

How do I authenticate with the Clojars API?

Clojars uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Clojars Authentication.

Is the Clojars API ready for AI agents?

Clojars has a Kin Score of 28.7 out of 100 (thin) and an Agent Readiness score of 24.5 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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Tools for providers

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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