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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Stack Auth the way a machine reads it — 39 machine-readable artifacts across 18 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Stack Auth scores 37.0/100 (thin), with a separate agent-readiness read of 32/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
Put this on your own site. The badge is drawn live from Stack Auth's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/stack-auth/"
title="Stack Auth on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/stack-auth.svg"
alt="Stack Auth Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/stack-auth/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/stack-auth/"
title="Stack Auth on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/stack-auth/card.svg"
alt="Stack Auth Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Stack Auth
Each block below is one kind of artifact we hold for Stack Auth. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 18
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 within the panel for all 18 ·
Open Collections 15
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONStack REST Auth API
OPEN COLLECTIONStack REST Auth Connected Accounts API
OPEN COLLECTIONStack REST Auth Contact Channels API
OPEN COLLECTIONStack REST Auth Emails API
OPEN COLLECTIONStack REST Auth Sessions API
OPEN COLLECTIONStack REST Auth Stack Auth REST API API
OPEN COLLECTIONStack REST Auth Team Api Keys API
OPEN COLLECTIONStack REST Auth Team Memberships API
OPEN COLLECTIONStack REST Auth Team Permissions API
OPEN COLLECTIONStack REST Auth Teams API
OPEN COLLECTIONStack REST Auth User Api Keys API
OPEN COLLECTIONStack REST Auth Users API
OPEN COLLECTIONStack REST Auth Webhooks API
OPEN COLLECTIONStack Auth REST API
OPEN COLLECTIONScroll within the panel for all 15 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Stack Auth Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Stack Auth Finops
FINOPSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Stack Auth — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Commercial 1
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/stack-auth · machine-readable index on apis.io
This is an independent, third-party profile of Stack Auth, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.