Keycloak website screenshot

Keycloak

Keycloak is an open source identity and access management solution for modern applications and services, providing single sign-on, identity brokering, user federation, and fine-grained authorization using OAuth 2.0 and OpenID Connect.

Keycloak publishes 6 APIs on the APIs.io network, including Clients API, Groups API, Identity Providers API, and 3 more. Tagged areas include Authentication, Authorization, Identity Management, OpenID Connect, and Security.

The Keycloak catalog on APIs.io includes 1 Spectral governance ruleset.

Keycloak’s developer surface includes changelog, CLI, authentication, documentation, getting-started guide, engineering blog, and 29 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.2/100 thin ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent library Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
AccessFreemiumSelf serve⚡ Free to try
1 APIs
AuthenticationAuthorizationIdentity ManagementOpenID ConnectSecuritySSOIdentity Federation

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Composite quality — 36.2/100 · thin
Contract Quality 9.1 / 19
Developer Ergonomics 6.1 / 15
Access Clarity 2.4 / 15
Operational Transparency 2.6 / 10
Contract Governance 2.5 / 9
Discoverability 4.3 / 8
Regulatory Posture 3.4 / 15
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 8 / 8
Request/Response Examples 0 / 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
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/.
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/keycloak: 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 →

What adopting Keycloak moves on the Kin Score 6

Keycloak is an area vendor: providers adopt it to run part of their developer surface. This is the Kin Score checks its features can move for a provider that adopts it, what each one really earns, and what it earns nothing for.

identitycapability map5 features checked 2026-09-25 · rubric v0.22.0

Keycloak is self-hosted, so its discovery document already sits on the provider’s own domain, and it advertises authorization_code and a registration endpoint. But the document lives under the realm path, and the harvest probes only the host root, so the served tiers of auth clarity, delegated identity and dynamic client registration are reached only if the provider also answers the root well-known paths (a reverse-proxy rewrite). Keycloak says outright that protected-resource metadata is the MCP server’s job, and it does not yet support RFC 8707 resource indicators.

Access Clarity5.0 of 38 pts
Agent Readiness16.5 of 139 pts
Contract Quality4.0 of 211 pts
Regulatory6.0 of 108 pts
CheckEarnsThrough
Machine-Readable Authpartial
Agent ReadinessThe served tier needs the document at the host root; Keycloak serves it under /realms//, so without a root rewrite only the OpenAPI fallback (oauth2 declared in the provider's contract) reads.		 7.5 of 10 Realm-scoped OIDC discovery
Delegated User Identitypartial
Agent ReadinessServed tier needs the root document; documented reads an authorizationCode flow in the provider’s OpenAPI.		 3.0 of 6 Realm-scoped OIDC discovery
Self-service sign-up
Access ClarityEnable realm self-registration and declare the login/registration URL as a Login or SignUp pointer.		 5.0 of 5 Login and self-registration pages
Enumerates OAuth scopessaturated
Contract QualityOnly if the provider’s own OpenAPI declares oauth2 and enumerates its client scopes.		 4.0 of 4 MCP authorization server support
Registration Without a Humanconditional
Agent ReadinessOnly if the provider serves the realm’s discovery document at the host’s root /.well-known/openid-configuration or oauth-authorization-server (reverse-proxy rewrite) on a host on its record; the realm-path document is not probed.		 6.0 of 6 Client Registration service (RFC 7591/7592)
FAPI / hardened authorization profileconditional
RegulatoryBanking/open-finance regime, FAPI client policies switched on, and the provider’s own auth documentation stating FAPI, PAR, private_key_jwt or mTLS-bound tokens.		 6.0 of 6 Certified specifications incl. FAPI
Across 8977 providers that publish a contract, adopting Keycloak would move 8268. Median lift: composite +2.4 (90th percentile +2.7), agent readiness +5.0 (+5.9). Conditional rows excluded.
What Keycloak ships that earns nothing (2)
  • Certified specifications incl. FAPI — The OpenID/FAPI certifications are Keycloak’s; the check reads a certification the provider holds.
  • Realm-scoped OIDC discovery — openid-configuration is not one of the well-known documents that check reads, at any path.

A model, not a score. Adopting this vendor changes a provider's Kin Score only when the provider publishes the resulting artifacts on its own surface; nothing here writes a score, and no sponsorship or partnership can. The rating is not for sale → · Full vendor facets artifact

APIs 6

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

Keycloak Clients API

Manage OAuth/OIDC clients within a realm

Keycloak Groups API

Manage user groups within a realm

Keycloak Identity Providers API

Manage identity providers for federated authentication

Keycloak Realms API

Manage Keycloak realms

Keycloak Roles API

Manage realm-level and client-level roles

Keycloak Users API

Manage users within a realm

Open Collections 8

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

API Collection

OPEN COLLECTION

Keycloak Admin REST API

OPEN COLLECTION

Keycloak Admin REST Clients API

OPEN COLLECTION

Keycloak Admin REST Clients Groups API

OPEN COLLECTION

Keycloak Admin REST Clients Identity Providers API

OPEN COLLECTION

Keycloak Admin REST Clients Realms API

OPEN COLLECTION

Keycloak Admin REST Clients Roles API

OPEN COLLECTION

Keycloak Admin REST Clients Users API

OPEN COLLECTION

Scroll for all 8

Arazzo Workflows 13

Multi-step API workflows described with the Arazzo specification.

Keycloak Assign a User to a Group

Resolve a user and a group by name, add the membership, and verify it landed.

ARAZZO

Keycloak Audit Group Membership

Resolve a group by name, read its roles and roster, and spot-check the effective roles of a member.

ARAZZO

Keycloak Audit a User's Effective Access

Resolve a user by username and assemble their profile, realm role mappings, and group membership.

ARAZZO

Keycloak Decommission a Client

Snapshot a client registration, disable it, and optionally delete it after a soak period.

ARAZZO

Keycloak Federate an Identity Provider

Upsert an OIDC or SAML identity provider by alias and verify the stored configuration.

ARAZZO

Keycloak Apply a Realm Security Baseline

Capture a realm's current settings, apply brute force protection and session hardening, and verify the result.

ARAZZO

Keycloak Inventory a Realm

Discover available realms and assemble a full read-only inventory of one realm's clients, roles, groups, and identity providers.

ARAZZO

Keycloak Offboard a User

Disable a user, strip realm role mappings and group membership, and optionally delete the account.

ARAZZO

Keycloak Onboard a User

Provision a realm user, set an initial password, and grant a realm-level role.

ARAZZO

Keycloak Provision a Group Hierarchy

Create a top-level group, resolve its id, nest a child group beneath it, and read back the hierarchy.

ARAZZO

Keycloak Register a Confidential OIDC Client

Register an OpenID Connect client in a realm, resolve its internal UUID, and retrieve its generated secret.

ARAZZO

Keycloak Rotate a Client Secret

Resolve a client by clientId, capture the outgoing secret, regenerate it, and verify the new value.

ARAZZO

Keycloak Upsert a Realm Role

Create a realm-level role if it is missing, update it if it already exists, then read it back.

ARAZZO

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Pricing Plans 1

Published pricing tiers and plan structures.

Keycloak Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Keycloak Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Keycloak Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Keycloak API Rules

5 rules · 3 warnings 2 info

SPECTRAL

Security Posture 3

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

Keycloak Authentication

http · 1 scheme

SECURITY

Keycloak Domain Security

TLSv1.3 · DMARC

SECURITY

Keycloak Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Keycloak Agentic Access

40 operations · 24 acting · 1 human-in-the-loop

40 operations · 24 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate
X-MCPServerCandidate
 AgenticAccess
AgenticAccess
 WellKnown
WellKnown
 LLMsTxt
LLMsTxt

Design & Contract 16

Pagination, idempotency, versioning, errors, and events

Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Conformance
Conformance
 Lifecycle
Lifecycle
 Conventions
Conventions

Scroll for all 16

Build 3

SDKs, sample code, and the tooling you integrate with

Packages
Packages
 CLI
CLI
 GitHubOrganization
GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

ChangeLog
ChangeLog
 Community
Community

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

VendorFacets
VendorFacets
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: keycloak
name: Keycloak
description: Keycloak is an open source identity and access management solution for modern applications and services, providing
  single sign-on, identity brokering, user federation, and fine-grained authorization using OAuth 2.0 and OpenID Connect.
type: Index
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/keycloak.png
tags:
- Authentication
- Authorization
- Identity Management
- OpenID Connect
- Security
- SSO
- Identity Federation
tags_raw:
- Authentication
- Authorization
- Identity Management
- OAuth
- OpenID Connect
- Security
- SSO
- Identity Federation
url: https://raw.githubusercontent.com/api-evangelist/keycloak/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-06-20'
specificationVersion: '0.23'
apis:
- aid: keycloak:keycloak-clients-api
  name: Keycloak Clients API
  description: Manage OAuth/OIDC clients within a realm
  humanURL: https://www.keycloak.org/docs-api/latest/rest-api/
  tags:
  - Clients
  properties:
  - type: OpenAPI
    url: openapi/keycloak-clients-api-openapi.yml
  - type: Documentation
    url: https://www.keycloak.org/docs-api/latest/rest-api/
  - type: Reference
    url: https://www.keycloak.org/docs/latest/server_admin/
  - type: JSONSchema
    url: json-schema/realm.yml
  - type: JSONSchema
    url: json-schema/client.yml
  - type: JSONSchema
    url: json-schema/user.yml
  - type: JSONLD
    url: json-ld/keycloak-context.yml
  - type: ErrorCatalog
    url: errors/keycloak-problem-types.yml
  - type: DataModel
    url: data-model/keycloak-data-model.yml
- aid: keycloak:keycloak-groups-api
  name: Keycloak Groups API
  description: Manage user groups within a realm
  humanURL: https://www.keycloak.org/docs-api/latest/rest-api/
  tags:
  - Group
  tags_raw:
  - Groups
  properties:
  - type: OpenAPI
    url: openapi/keycloak-groups-api-openapi.yml
  - type: Documentation
    url: https://www.keycloak.org/docs-api/latest/rest-api/
  - type: Reference
    url: https://www.keycloak.org/docs/latest/server_admin/
  - type: JSONSchema
    url: json-schema/realm.yml
  - type: JSONSchema
    url: json-schema/client.yml
  - type: JSONSchema
    url: json-schema/user.yml
  - type: JSONLD
    url: json-ld/keycloak-context.yml
  - type: ErrorCatalog
    url: errors/keycloak-problem-types.yml
  - type: DataModel
    url: data-model/keycloak-data-model.yml
- aid: keycloak:keycloak-identity-providers-api
  name: Keycloak Identity Providers API
  description: Manage identity providers for federated authentication
  humanURL: https://www.keycloak.org/docs-api/latest/rest-api/
  tags:
  - Identity Providers
  properties:
  - type: OpenAPI
    url: openapi/keycloak-identity-providers-api-openapi.yml
  - type: Documentation
    url: https://www.keycloak.org/docs-api/latest/rest-api/
  - type: Reference
    url: https://www.keycloak.org/docs/latest/server_admin/
  - type: JSONSchema
    url: json-schema/realm.yml
  - type: JSONSchema
    url: json-schema/client.yml
  - type: JSONSchema
    url: json-schema/user.yml
  - type: JSONLD
    url: json-ld/keycloak-context.yml
  - type: ErrorCatalog
    url: errors/keycloak-problem-types.yml
  - type: DataModel
    url: data-model/keycloak-data-model.yml
- aid: keycloak:keycloak-realms-api
  name: Keycloak Realms API
  description: Manage Keycloak realms
  humanURL: https://www.keycloak.org/docs-api/latest/rest-api/
  tags:
  - Realms
  properties:
  - type: OpenAPI
    url: openapi/keycloak-realms-api-openapi.yml
  - type: Documentation
    url: https://www.keycloak.org/docs-api/latest/rest-api/
  - type: Reference
    url: https://www.keycloak.org/docs/latest/server_admin/
  - type: JSONSchema
    url: json-schema/realm.yml
  - type: JSONSchema
    url: json-schema/client.yml
  - type: JSONSchema
    url: json-schema/user.yml
  - type: JSONLD
    url: json-ld/keycloak-context.yml
  - type: ErrorCatalog
    url: errors/keycloak-problem-types.yml
  - type: DataModel
    url: data-model/keycloak-data-model.yml
- aid: keycloak:keycloak-roles-api
  name: Keycloak Roles API
  description: Manage realm-level and client-level roles
  humanURL: https://www.keycloak.org/docs-api/latest/rest-api/
  tags:
  - Roles
  properties:
  - type: OpenAPI
    url: openapi/keycloak-roles-api-openapi.yml
  - type: Documentation
    url: https://www.keycloak.org/docs-api/latest/rest-api/
  - type: Reference
    url: https://www.keycloak.org/docs/latest/server_admin/
  - type: JSONSchema
    url: json-schema/realm.yml
  - type: JSONSchema
    url: json-schema/client.yml
  - type: JSONSchema
    url: json-schema/user.yml
  - type: JSONLD
    url: json-ld/keycloak-context.yml
  - type: ErrorCatalog
    url: errors/keycloak-problem-types.yml
  - type: DataModel
    url: data-model/keycloak-data-model.yml
- aid: keycloak:keycloak-users-api
  name: Keycloak Users API
  description: Manage users within a realm
  humanURL: https://www.keycloak.org/docs-api/latest/rest-api/
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/keycloak-users-api-openapi.yml
  - type: Documentation
    url: https://www.keycloak.org/docs-api/latest/rest-api/
  - type: Reference
    url: https://www.keycloak.org/docs/latest/server_admin/
  - type: JSONSchema
    url: json-schema/realm.yml
  - type: JSONSchema
    url: json-schema/client.yml
  - type: JSONSchema
    url: json-schema/user.yml
  - type: JSONLD
    url: json-ld/keycloak-context.yml
  - type: ErrorCatalog
    url: errors/keycloak-problem-types.yml
  - type: DataModel
    url: data-model/keycloak-data-model.yml
common:
- type: VendorFacets
  url: vendor-facets/keycloak-vendor-facets.yml
- type: X-MCPServerCandidate
  url: mcp/keycloak-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Overlay
  url: overlays/keycloak-admin-rest-api-overlay.yaml
- type: Arazzo
  url: arazzo/keycloak-onboard-user-workflow.yml
  name: Keycloak Onboard a User
- type: Arazzo
  url: arazzo/keycloak-offboard-user-workflow.yml
  name: Keycloak Offboard a User
- type: Arazzo
  url: arazzo/keycloak-audit-user-access-workflow.yml
  name: Keycloak Audit a User's Effective Access
- type: Arazzo
  url: arazzo/keycloak-register-oidc-client-workflow.yml
  name: Keycloak Register a Confidential OIDC Client
- type: Arazzo
  url: arazzo/keycloak-rotate-client-secret-workflow.yml
  name: Keycloak Rotate a Client Secret
- type: Arazzo
  url: arazzo/keycloak-decommission-client-workflow.yml
  name: Keycloak Decommission a Client
- type: Arazzo
  url: arazzo/keycloak-upsert-realm-role-workflow.yml
  name: Keycloak Upsert a Realm Role
- type: Arazzo
  url: arazzo/keycloak-provision-group-hierarchy-workflow.yml
  name: Keycloak Provision a Group Hierarchy
- type: Arazzo
  url: arazzo/keycloak-assign-user-to-group-workflow.yml
  name: Keycloak Assign a User to a Group
- type: Arazzo
  url: arazzo/keycloak-audit-group-membership-workflow.yml
  name: Keycloak Audit Group Membership
- type: Arazzo
  url: arazzo/keycloak-federate-identity-provider-workflow.yml
  name: Keycloak Federate an Identity Provider
- type: Arazzo
  url: arazzo/keycloak-harden-realm-workflow.yml
  name: Keycloak Apply a Realm Security Baseline
- type: Arazzo
  url: arazzo/keycloak-inventory-realm-workflow.yml
  name: Keycloak Inventory a Realm
- type: AgenticAccess
  url: agentic-access/keycloak-agentic-access.yml
- type: Packages
  url: packages/keycloak-packages.yml
- type: WellKnown
  url: well-known/keycloak-well-known.yml
- type: SecurityTxt
  url: well-known/keycloak-security.txt
- type: LLMsTxt
  url: llms/keycloak-llms.txt
- type: Conformance
  url: conformance/keycloak-conformance.yml
- type: Lifecycle
  url: lifecycle/keycloak-lifecycle.yml
- type: Conventions
  url: conventions/keycloak-conventions.yml
- type: ChangeLog
  url: changelog/keycloak-changelog.yml
- type: CLI
  url: cli/keycloak-cli.yml
- type: VulnerabilityDisclosure
  url: security/keycloak-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/keycloak-domain-security.yml
- type: Authentication
  url: authentication/keycloak-authentication.yml
- type: Website
  url: https://www.keycloak.org/
- type: Documentation
  url: https://www.keycloak.org/documentation
- type: GettingStarted
  url: https://www.keycloak.org/getting-started
- type: GitHubOrganization
  url: https://github.com/keycloak/keycloak
- type: Blog
  url: https://www.keycloak.org/blog
- type: Community
  url: https://www.keycloak.org/community
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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