Stack Auth website screenshot

Stack Auth

Stack Auth is an open-source authentication and user management platform positioned as a self-hostable alternative to closed-source providers like Clerk and Auth0. It bundles password, OAuth / SSO, and two-factor sign-in flows with organizations, teams, role-based access control, impersonation, webhooks, and pre-built UI components built on shadcn/ui (or a headless SDK). Stack Auth is available as a hosted SaaS at app.stack-auth.com and as a self-hosted deployment from the stack-auth/stack monorepo on GitHub. Authentication is JWT-based. Y Combinator-backed.

Stack Auth publishes 13 APIs on the APIs.io network, including Auth API, Connected Accounts API, Contact Channels API, and 10 more. Tagged areas include Authentication, User Management, Open Source, Self-Hosted, and Identity.

Stack Auth’s developer surface includes authentication, documentation, GitHub presence, pricing, engineering blog, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.7/100 thin ▬ flat Agent 32/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
18 APIs
AuthenticationUser ManagementOpen SourceSelf-HostedIdentityOrganizationsRBAC

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 36.7/100 · thin
Contract Quality 13.7 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 3.4 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 32/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 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 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 8 / 8
Dry-Run / Simulate Mode 0 / 4
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/stack-auth: 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 18

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

Stack Auth REST API

REST API for managing users, sessions, OAuth providers, teams, organizations, permissions, and webhooks. Used by Stack Auth's own SDKs and available for custom backend integrati...

Stack Auth Webhooks

Outbound webhook events for user lifecycle, team / organization membership, and permission changes. Customers register endpoint URLs and verify delivery via signed payloads.

Stack Auth React / Next.js SDK

Frontend SDK distributed as @stackframe/stack on npm. Provides React components, hooks, and Next.js App Router middleware for sign-in, sign-up, account settings, and team / orga...

Stack Auth CLI

Project bootstrap CLI distributed as @stackframe/init-stack on npm, invoked with `npx @stackframe/init-stack@latest` to wire Stack Auth into a new or existing project.

Stack Auth Self-Hosted (stack-auth/stack)

Open-source monorepo containing the Stack Auth backend (Next.js + Postgres) and dashboard. Deployable on customer infrastructure as an alternative to the hosted SaaS at app.stac...

Stack Auth Auth API

The Auth API from Stack Auth — 4 operation(s) for auth.

Stack Auth Connected Accounts API

The Connected Accounts API from Stack Auth — 1 operation(s) for connected accounts.

Stack Auth Contact Channels API

The Contact Channels API from Stack Auth — 4 operation(s) for contact channels.

Stack Auth Emails API

The Emails API from Stack Auth — 2 operation(s) for emails.

Stack Auth Sessions API

The Sessions API from Stack Auth — 3 operation(s) for sessions.

Stack Auth Stack Auth REST API API

The Stack Auth REST API API from Stack Auth — 1 operation(s) for stack auth rest api.

Stack Auth Team Api Keys API

The Team Api Keys API from Stack Auth — 3 operation(s) for team api keys.

Stack Auth Team Memberships API

The Team Memberships API from Stack Auth — 1 operation(s) for team memberships.

Stack Auth Team Permissions API

The Team Permissions API from Stack Auth — 1 operation(s) for team permissions.

Stack Auth Teams API

The Teams API from Stack Auth — 2 operation(s) for teams.

Stack Auth User Api Keys API

The User Api Keys API from Stack Auth — 3 operation(s) for user api keys.

Stack Auth Users API

The Users API from Stack Auth — 2 operation(s) for users.

Stack Auth Webhooks API

The Webhooks API from Stack Auth — 1 operation(s) for webhooks.

Scroll for all 18

Open Collections 1

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

Stack Auth REST API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Stack Auth Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Stack Auth Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Stack Auth Finops

FINOPS

Security Posture 2

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

Stack Auth Authentication

apiKey · 5 schemes

SECURITY

Stack Auth Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Stack Auth Agentic Access

45 operations · 28 acting

45 operations · 28 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub
GitHub

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Commercial 1

Pricing, plans, and the legal terms of use

Pricing
Pricing

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

AgentCard
AgentCard
 Dashboard
Dashboard

Source (apis.yml)

apis.yml Raw ↑ 
aid: stack-auth
url: https://raw.githubusercontent.com/api-evangelist/stack-auth/refs/heads/main/apis.yml
name: Stack Auth
kind: company
description: Stack Auth is an open-source authentication and user management platform positioned as a self-hostable alternative
  to closed-source providers like Clerk and Auth0. It bundles password, OAuth / SSO, and two-factor sign-in flows with organizations,
  teams, role-based access control, impersonation, webhooks, and pre-built UI components built on shadcn/ui (or a headless
  SDK). Stack Auth is available as a hosted SaaS at app.stack-auth.com and as a self-hosted deployment from the stack-auth/stack
  monorepo on GitHub. Authentication is JWT-based. Y Combinator-backed.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Authentication
- User Management
- Open Source
- Self-Hosted
- Identity
- Organizations
- RBAC
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.19'
apis:
- aid: stack-auth:rest-api
  name: Stack Auth REST API
  description: REST API for managing users, sessions, OAuth providers, teams, organizations, permissions, and webhooks. Used
    by Stack Auth's own SDKs and available for custom backend integrations. JWT-based authentication with server / publishable
    / secret API keys per project.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - REST
  - Authentication
  - Users
  - Teams
  properties:
  - type: Documentation
    url: https://docs.stack-auth.com/rest-api/overview
- aid: stack-auth:webhooks
  name: Stack Auth Webhooks
  description: Outbound webhook events for user lifecycle, team / organization membership, and permission changes. Customers
    register endpoint URLs and verify delivery via signed payloads.
  humanURL: https://docs.stack-auth.com/concepts/webhooks
  baseURL: customer-configured
  tags:
  - Webhooks
  - Events
  properties:
  - type: Documentation
    url: https://docs.stack-auth.com/concepts/webhooks
- aid: stack-auth:sdk-react
  name: Stack Auth React / Next.js SDK
  description: Frontend SDK distributed as @stackframe/stack on npm. Provides React components, hooks, and Next.js App Router
    middleware for sign-in, sign-up, account settings, and team / organization management. Headless mode supported for custom
    UI.
  humanURL: https://docs.stack-auth.com/sdk/overview
  baseURL: https://github.com/stack-auth/stack
  tags:
  - SDK
  - React
  - Next.js
  - Frontend
  properties:
  - type: Documentation
    url: https://docs.stack-auth.com/sdk/overview
  - type: Repository
    url: https://github.com/stack-auth/stack
- aid: stack-auth:cli
  name: Stack Auth CLI
  description: Project bootstrap CLI distributed as @stackframe/init-stack on npm, invoked with `npx @stackframe/init-stack@latest`
    to wire Stack Auth into a new or existing project.
  humanURL: https://docs.stack-auth.com/getting-started/setup
  baseURL: https://github.com/stack-auth/stack
  tags:
  - CLI
  - Tooling
  properties:
  - type: Documentation
    url: https://docs.stack-auth.com/getting-started/setup
- aid: stack-auth:self-hosted
  name: Stack Auth Self-Hosted (stack-auth/stack)
  description: Open-source monorepo containing the Stack Auth backend (Next.js + Postgres) and dashboard. Deployable on customer
    infrastructure as an alternative to the hosted SaaS at app.stack-auth.com.
  humanURL: https://github.com/stack-auth/stack
  baseURL: https://github.com/stack-auth/stack
  tags:
  - Open Source
  - Self-Hosted
  - Repository
  properties:
  - type: Repository
    url: https://github.com/stack-auth/stack
- aid: stack-auth:stack-auth-auth-api
  name: Stack Auth Auth API
  description: The Auth API from Stack Auth — 4 operation(s) for auth.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-auth-api-openapi.yml
- aid: stack-auth:stack-auth-connected-accounts-api
  name: Stack Auth Connected Accounts API
  description: The Connected Accounts API from Stack Auth — 1 operation(s) for connected accounts.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Connected Accounts
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-connected-accounts-api-openapi.yml
- aid: stack-auth:stack-auth-contact-channels-api
  name: Stack Auth Contact Channels API
  description: The Contact Channels API from Stack Auth — 4 operation(s) for contact channels.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Contact Channels
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-contact-channels-api-openapi.yml
- aid: stack-auth:stack-auth-emails-api
  name: Stack Auth Emails API
  description: The Emails API from Stack Auth — 2 operation(s) for emails.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Emails
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-emails-api-openapi.yml
- aid: stack-auth:stack-auth-sessions-api
  name: Stack Auth Sessions API
  description: The Sessions API from Stack Auth — 3 operation(s) for sessions.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Sessions
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-sessions-api-openapi.yml
- aid: stack-auth:stack-auth-stack-auth-rest-api-api
  name: Stack Auth Stack Auth REST API API
  description: The Stack Auth REST API API from Stack Auth — 1 operation(s) for stack auth rest api.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Stack Auth REST API
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-stack-auth-rest-api-api-openapi.yml
- aid: stack-auth:stack-auth-team-api-keys-api
  name: Stack Auth Team Api Keys API
  description: The Team Api Keys API from Stack Auth — 3 operation(s) for team api keys.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Team Api Keys
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-team-api-keys-api-openapi.yml
- aid: stack-auth:stack-auth-team-memberships-api
  name: Stack Auth Team Memberships API
  description: The Team Memberships API from Stack Auth — 1 operation(s) for team memberships.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Team Memberships
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-team-memberships-api-openapi.yml
- aid: stack-auth:stack-auth-team-permissions-api
  name: Stack Auth Team Permissions API
  description: The Team Permissions API from Stack Auth — 1 operation(s) for team permissions.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Team Permissions
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-team-permissions-api-openapi.yml
- aid: stack-auth:stack-auth-teams-api
  name: Stack Auth Teams API
  description: The Teams API from Stack Auth — 2 operation(s) for teams.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Teams
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-teams-api-openapi.yml
- aid: stack-auth:stack-auth-user-api-keys-api
  name: Stack Auth User Api Keys API
  description: The User Api Keys API from Stack Auth — 3 operation(s) for user api keys.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - User Api Keys
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-user-api-keys-api-openapi.yml
- aid: stack-auth:stack-auth-users-api
  name: Stack Auth Users API
  description: The Users API from Stack Auth — 2 operation(s) for users.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-users-api-openapi.yml
- aid: stack-auth:stack-auth-webhooks-api
  name: Stack Auth Webhooks API
  description: The Webhooks API from Stack Auth — 1 operation(s) for webhooks.
  humanURL: https://docs.stack-auth.com/rest-api/overview
  baseURL: https://api.stack-auth.com
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/stack-auth-webhooks-api-openapi.yml
common:
- type: AgentCard
  url: a2a/stack-auth-a2a.yml
  name: A2A Agent Card
  description: Agent Card served at /.well-known/agent-card.json (flavored against A2A 1.0.0).
- type: AgenticAccess
  url: agentic-access/stack-auth-agentic-access.yml
- type: DomainSecurity
  url: security/stack-auth-domain-security.yml
- type: Authentication
  url: authentication/stack-auth-authentication.yml
- type: Website
  url: https://stack-auth.com/
- type: Documentation
  url: https://docs.stack-auth.com/
- type: GitHub
  url: https://github.com/stack-auth
- type: Dashboard
  url: https://app.stack-auth.com/
- type: Pricing
  url: https://stack-auth.com/pricing
- type: Blog
  url: https://stack-auth.com/blog
- type: LlmsText
  url: https://docs.stack-auth.com/llms.txt
integrations:
- name: Next.js
- name: React
- name: shadcn/ui
- name: PostgreSQL
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com