FusionAuth website screenshot

FusionAuth

FusionAuth is a developer-focused customer identity and access management (CIAM) platform that delivers authentication, authorization, registration, multi-factor authentication, single sign-on, OAuth2 and OpenID Connect, and user management capabilities through a comprehensive REST API and self-hostable identity service.

FusionAuth publishes 1 API on the APIs.io network. Tagged areas include Authentication, Authorization, Identity, CIAM, and OAuth.

FusionAuth’s developer surface includes authentication, getting-started guide, changelog, engineering blog, signup flow, pricing, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub
49.7/100 developing ▬ flat Agent 64/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 14 Agent Skills 0 Features
AuthenticationAuthorizationIdentityCIAMOAuthOpenID ConnectSingle Sign-OnMulti-Factor Authentication

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 49.7/100 · developing
Contract Quality 9.4 / 25
Developer Ergonomics 7.8 / 20
Commercial Clarity 16.3 / 20
Operational Transparency 6.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 64/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fusionauth: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

FusionAuth API

The FusionAuth API exposes the platform's complete authentication, authorization, user management, OAuth2/OIDC, multi-factor, tenant, application, and administrative surface as ...

MCP Servers

MCP Server

MCP SERVER

Agent Skills

chargebee-webhooks

AGENT SKILL

clerk-webhooks

AGENT SKILL

deepgram-webhooks

AGENT SKILL

elevenlabs-webhooks

AGENT SKILL

fusionauth-webhooks

AGENT SKILL

github-webhooks

AGENT SKILL

hookdeck-event-gateway

AGENT SKILL

openai-webhooks

AGENT SKILL

paddle-webhooks

AGENT SKILL

resend-webhooks

AGENT SKILL

sendgrid-webhooks

AGENT SKILL

shopify-webhooks

AGENT SKILL

stripe-webhooks

AGENT SKILL

webhook-handler-patterns

AGENT SKILL

Pricing Plans

Fusionauth Plans Pricing

3 plans

PLANS

Rate Limits

Fusionauth Rate Limits

5 limits

RATE LIMITS

FinOps

Fusionauth Finops

FINOPS

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted
 Login
Login
 Signup
Signup

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 AgentSkills
AgentSkills
 LlmsText
LlmsText

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs
SDKs
 GitHubOrganization
GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

ChangeLog
ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy
 Pricing
Pricing

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: fusionauth
name: FusionAuth
type: Index
description: FusionAuth is a developer-focused customer identity and access management (CIAM) platform that delivers authentication,
  authorization, registration, multi-factor authentication, single sign-on, OAuth2 and OpenID Connect, and user management
  capabilities through a comprehensive REST API and self-hostable identity service.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Authentication
- Authorization
- Identity
- CIAM
- OAuth
- OpenID Connect
- Single Sign-On
- Multi-Factor Authentication
created: '2024-09-26'
modified: '2026-05-25'
position: Consumer
access: 3rd-Party
url: https://raw.githubusercontent.com/api-evangelist/fusionauth/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: fusionauth:fusionauth
  name: FusionAuth API
  description: The FusionAuth API exposes the platform's complete authentication, authorization, user management, OAuth2/OIDC,
    multi-factor, tenant, application, and administrative surface as a REST API. An upstream OpenAPI 3.0 specification is
    published and maintained by FusionAuth.
  humanURL: https://fusionauth.io/docs/
  baseURL: https://sandbox.fusionauth.io
  tags:
  - Authentication
  - Authorization
  - Identity
  - CIAM
  - OAuth
  - OpenID Connect
  properties:
  - type: Documentation
    url: https://fusionauth.io/docs/apis/
  - type: OpenAPI
    url: https://raw.githubusercontent.com/FusionAuth/fusionauth-openapi/main/openapi.yaml
  - type: SDKs
    url: https://fusionauth.io/docs/sdks/
common:
- type: AgenticAccess
  url: agentic-access/fusionauth-agentic-access.yml
- type: TrustCenter
  url: security/fusionauth-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/fusionauth-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/fusionauth-domain-security.yml
- type: Authentication
  url: authentication/fusionauth-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/fusionauth
- type: GettingStarted
  url: https://fusionauth.io/docs/get-started/
- type: SDKs
  url: https://fusionauth.io/docs/sdks/
- type: ChangeLog
  url: https://fusionauth.io/docs/release-notes/
- type: Blog
  url: https://fusionauth.io/blog/
- type: Login
  url: https://login.fusionauth.io/oauth2/authorize
- type: Signup
  url: https://login.fusionauth.io/oauth2/register
- type: PrivacyPolicy
  url: https://fusionauth.io/privacy-policy
- type: GitHubOrganization
  url: https://github.com/fusionauth
- type: Pricing
  url: https://fusionauth.io/pricing
- type: Integrations
  url: https://fusionauth.io/partners
- name: MCP Server
  url: https://github.com/FusionAuth/fusionauth-mcp-api
  type: MCPServer
- name: Agent Skills
  url: https://github.com/FusionAuth/webhook-skills
  type: AgentSkills
- type: LlmsText
  url: https://fusionauth.io/llms.txt
integrations:
- name: fusionauth partner specialist
- name: fusionauth start building
- name: FusionAuth AWS Partner
- name: FusionAuth AWS Qualified Software badge
- name: AICPA SOC 2 Compliance
- name: fusionauth ISO 27001 certified
- name: fusionauth social github
- name: fusionauth social twitter
- name: fusionauth social linkedin
- name: fusionauth social youtube
- name: fusionauth rss feed
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com