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Clerk website screenshot

Clerk

Clerk is a complete user management and authentication infrastructure platform offering embeddable UI components, flexible APIs, and admin dashboards. It provides full-stack authentication including multi-factor authentication, social sign-on, passkeys, organizations for B2B SaaS, billing, session management, and machine-to-machine authentication, with SDKs spanning Next.js, React, Expo, iOS, Android, Go, Python, Ruby, Java, PHP, and C#.

agent ready

Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.

Kin Score

API Evangelist profiles Clerk the way a machine reads it — 325 machine-readable artifacts across 3 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 — Clerk scores 65.8/100 (strong), with a separate agent-readiness read of 31/100 (agent ready). 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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.

Kin Score Kin Score How this is scored →
scored 2026-09-10 · rubric v0.20.0
Clerk Kin Score — API readiness rating by API Evangelist

Put this on your own site. The badge is drawn live from Clerk'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/clerk-com/"
   title="Clerk on API Evangelist — API profile and Kin Score">
  <img src="https://apis.io/badge/clerk-com.svg"
       alt="Clerk Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>

More shapes, themes and sizes → · Score as JSON · How badges work

How we profile Clerk

Each block below is one kind of artifact we hold for Clerk. 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 104

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.

Clerk Account Portal API

The Account Portal API from Clerk — 1 operation(s) for account portal.

Clerk Active Sessions API

Used to interact with the sessions of the current user.

Clerk Actor Tokens API

Allow your users to sign in on behalf of other users.

Clerk Agent Tasks API

Tasks that allow creating user sessions for agent-based interactions.

Clerk Allow-list / Block-list API

Allow-lists and Block-lists allow you to control who can sign up or sign in to your application, by restricting access based on the user's email address or phone number.

Clerk API Keys API

Endpoints for managing API Keys

Clerk Application Transfers API

An object representing a transfer request for an application between workspaces. The high-level flow for application transfer: 1. The initial workspace can create an application...

Clerk Applications API

An object representing a Clerk application. Each `application` can have multiple `instances`, typically one for development and one for production, each with distinct user pools.

Clerk Backup Codes API

Used to interact with the two factor authentication backup codes of the current user.

Clerk Beta Features API

Modify instance settings that are currently in beta.

Clerk Billing API

Billing-related endpoints for managing statements and payment attempts.

Clerk Checkouts API

Used to interact with the checkout flow.

Clerk Clear Site Data API

The Clear Site Data API from Clerk — 1 operation(s) for clear site data.

Clerk Client API

Used to interact with the Client Object.

Clerk Clients API

The Client object tracks sessions, as well as the state of any sign in and sign up attempts, for a given device.

Clerk Config API

Operations for managing instance configuration. The config API provides a unified interface for reading and updating instance settings, including authentication methods, SSO con...

Clerk Dev Browser API

The Dev Browser API from Clerk — 2 operation(s) for dev browser.

Clerk DevBrowser API

Used to handle dev browsers.

Clerk Domains API

Domains represent each instance's URLs and DNS setup.

Clerk Email Addresses API

A user can be associated with one or more email addresses, which allows them to be contacted via email.

Clerk Email & SMS Templates API

Email & SMS templates allow you to customize the theming and wording of emails & SMS messages that are sent by your instance.

Clerk Enterprise Connections API

An Enterprise Connection holds configuration data required for facilitating an enterprise SSO flow between your Clerk instance and an identity provider.

Clerk Environment API

Used to get and update the current Environment

Clerk External Accounts API

Used to interact with the external accounts of the current user.

Clerk Health API

Used to get the health status of the API.

Clerk Instance Settings API

Modify the settings of your instance.

Clerk Invitations API

Invitations allow you to invite someone to sign up to your application, via email.

Clerk JWKS API

Retrieve the JSON Web Key Set which can be used to verify the token signatures of the instance.

Clerk JWT Templates API

JWT Templates allow you to generate custom authentication tokens tied to authenticated sessions, enabling you to integrate with third-party services.

Clerk M2M Tokens API

Machine to Machine Tokens are used to manage authentication between Machines.

Clerk Machines API

A Machine represents a machine/server/service which can be used in machine-to-machine authentication.

Clerk Members API

Used to interact with the members of an organization. The current user must be an administrator to access them.

Clerk Membership Requests API

Used to interact with the members of an organization. The current user must be an administrator to access them.

Clerk Miscellaneous API

Various endpoints that do not belong in any particular category.

Clerk OAuth Access Tokens API

Endpoints for managing OAuth Access Tokens, which are credentials to access protected resources on behalf of a user.

Clerk OAuth Applications API

OAuth applications contain data for clients using Clerk as an OAuth2 identity provider.

Clerk OAuth2 Callbacks API

Used to receive callbacks from successful OAuth attempts.

Clerk OAuth2 Identity Provider API

Requests for the OAuth2 authorization flow.

Clerk Organization API

Used to interact with an organization and its properties. The current user must be an administrator to access them.

Clerk Organization Creation Defaults API

Used to get suggested defaults when creating a new organization.

Clerk Organization Domains API

Manage organization domains.

Clerk Organization Invitations API

Invite users to an organization.

Clerk Organization Memberships API

Manage member roles in an organization.

Clerk Organization Permissions API

Manage organization permissions that define what members can do within an organization.

Clerk Organization Roles API

Manage custom roles in an organization.

Clerk Organizations API

Organizations are used to group members under a common entity and provide shared access to resources.

Clerk Organizations Memberships API

Used to interact with the current user's organization memberships, invitations and suggestions.

Clerk Passkeys API

Used to interact with the passkeys of the logged in user.

Clerk Payment Attempts API

Used to interact with payment attempts for users and organizations.

Clerk Payment Methods API

Used to interact with payment methods belonging to users and organizations.

Clerk Phone Numbers API

A user can be associated with one or more phone numbers, which allows them to be contacted via SMS.

Clerk Plans API

Used to interact with plans that users and organizations can purchase.

Clerk Proxy Checks API

Check if a user is using a proxy.

Clerk Proxy Health API

The Proxy Health API from Clerk — 1 operation(s) for proxy health.

Clerk Redirect API

The Redirect API from Clerk — 1 operation(s) for redirect.

Clerk Redirect URLs API

Redirect URLs are whitelisted URLs that facilitate secure authentication flows in native applications (e.g. React Native, Expo). In these contexts, Clerk ensures that security-c...

Clerk Role Sets API

Role sets define collections of roles that can be assigned to organization members. Each organization uses one role set to determine the available roles for its members. Role se...

Clerk Roles API

The Roles API from Clerk — 1 operation(s) for roles.

Clerk SAML API

Used in authentication flows using SAML.

Clerk SAML Connections API

A SAML Connection holds configuration data required for facilitating a SAML SSO flow between your Clerk Instance (SP) and a particular SAML IdP.

Clerk Sessions API

The Session object is an abstraction over an HTTP session. It models the period of information exchange between a user and the server. Sessions are created when a user successfu...

Clerk Sign-in Tokens API

Sign-in tokens are JWTs that can be used to sign in to an application without specifying any credentials. A sign-in token can be used at most once and they can be consumed from ...

Clerk Sign Ins API

Used to sign in a user in the current client.

Clerk Sign Ups API

Sign-up objects track the progress of a sign-up attempt and store any field collected from user input.

Clerk Statements API

Used to interact with billing statements for users and organizations.

Clerk Subscription Items API

Used to interact with subscription items belonging to users and organizations.

Clerk Subscriptions API

Used to interact with subscriptions belonging to users and organizations.

Clerk Testing Tokens API

Tokens meant for use by end-to-end test suites in requests to the Frontend API, so as to bypass bot detection measures.

Clerk TOTP API

Used to interact with One Time Password authenticators of the current user.

Clerk User API

Used to interact with the properties of the current user.

Clerk Users API

The user object represents a user that has successfully signed up to your application.

Clerk Waitlist API

Used to interact with the waitlist.

Clerk Waitlist Entries API

Manage waitlist entries.

Clerk Web3 Wallets API

Used to interact with the web3 wallets of the logged in user.

Clerk Webhooks API

You can configure webhooks to be notified about various events that happen on your instance.

Clerk Well Known API

Well-known endpoints like JWKS, deep linking, and openid-configuration.

Clerk Frontend API

Browser-facing API consumed by Clerk's frontend SDKs and ClerkJS for sign-up, sign-in, session refresh, and user profile mutations. Endpoint is instance-specific (subdomain on c...

Clerk Webhooks (Svix)

Webhook events delivered via Svix for user, session, organization, email, SMS, and role lifecycle changes. Customers configure endpoints in the dashboard and verify signatures w...

Clerk JavaScript SDK

Official ClerkJS browser library and monorepo of framework adapters (Next.js, React, Expo, React Router, Astro, Chrome Extension, TanStack). Powers Clerk's prebuilt UI component...

Clerk Next.js SDK

Next.js integration covering App Router and Pages Router, middleware, route handlers, server components, and server actions. Distributed from the @clerk/nextjs package inside th...

Clerk React SDK

React components, hooks, and providers from the @clerk/clerk-react package for plain React SPAs.

Clerk Expo SDK

Expo / React Native bindings for Clerk supporting OAuth via deep links, secure session storage, and biometrics.

Clerk React Router SDK

Adapter for React Router v7 (Remix successor) covering loaders, actions, and server-rendered authentication.

Clerk Astro SDK

Adapter for the Astro framework with components and middleware.

Clerk TanStack Start SDK

Adapter for TanStack Start (React full-stack framework) with route-level authentication helpers.

Clerk Node.js SDK

Backend SDK for Node.js (@clerk/backend / @clerk/express / @clerk/fastify) that wraps the Backend API and verifies session JWTs.

Clerk Go SDK

Official Go SDK for the Clerk Backend API.

Clerk Python SDK

Official Python SDK for the Clerk Backend API.

Clerk Ruby SDK

Official Ruby SDK for the Clerk Backend API, with a Rails integration.

Clerk Java SDK

Official Java SDK for the Clerk Backend API.

Clerk PHP SDK

Official PHP SDK for the Clerk Backend API.

Clerk C# / .NET SDK

Official C# / .NET SDK for the Clerk Backend API.

Clerk OpenAPI Specifications

Public repository of OpenAPI specifications for Clerk's APIs, used as the source for generated SDKs and documentation.

Clerk Invitations API

The Invitations API from Clerk — 2 operation(s) for invitations.

Clerk JwtTemplates API

The JwtTemplates API from Clerk — 1 operation(s) for jwttemplates.

Clerk Organizations API

The Organizations API from Clerk — 4 operation(s) for organizations.

Clerk Sessions API

The Sessions API from Clerk — 4 operation(s) for sessions.

Clerk SignInTokens API

The SignInTokens API from Clerk — 2 operation(s) for signintokens.

Clerk Users API

The Users API from Clerk — 4 operation(s) for users.

Clerk Webhooks API

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

Clerk Allowlist & Blocklist API

Identifiers permitted or denied from signing up.

Clerk Email & SMS API

Email addresses, phone numbers, and message templates.

Clerk SAML & Enterprise Connections API

Enterprise SSO connections.

Clerk Sign-ups & Tokens API

Sign-up attempts, sign-in tokens, and actor tokens.

Scroll within the panel for all 104 ·

Postman Collections 76

A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.

Ready-to-run Postman collections for exercising this provider's APIs.

Scroll within the panel for all 76 ·

Open Collections 81

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 COLLECTION

Clerk Backend API

OPEN COLLECTION

Clerk Frontend API

OPEN COLLECTION

Clerk Platform API

OPEN COLLECTION

Clerk Webhook Events

OPEN COLLECTION

Scroll within the panel for all 81 ·

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 things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.

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.

Clerk Com Rate Limits

0 limits

RATE LIMITS

FinOps 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.

Semantic Vocabularies 1

JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.

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

Clerk Com Context

66 classes · 6 properties

JSON-LD

Spectral Rules 2

Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.

Clerk API Rules

5 rules · 4 warnings

SPECTRAL

Clerk API Rules

9 rules · 2 errors · 3 warnings

SPECTRAL

JSON Schema 14

Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.

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

Clerk ActorToken

9 properties

JSON SCHEMA

Clerk Client

10 properties

JSON SCHEMA

Clerk EmailAddress

9 properties

JSON SCHEMA

Clerk Invitation

10 properties

JSON SCHEMA

Clerk JWTTemplate

10 properties

JSON SCHEMA

Clerk OAuthApplication

21 properties

JSON SCHEMA

Clerk Organization

18 properties

JSON SCHEMA

Clerk OrganizationInvitation

15 properties

JSON SCHEMA

Clerk OrganizationMembership

11 properties

JSON SCHEMA

Clerk PhoneNumber

11 properties

JSON SCHEMA

Clerk SAMLConnection

27 properties

JSON SCHEMA

Clerk Session

14 properties

JSON SCHEMA

Clerk SignInToken

8 properties

JSON SCHEMA

Clerk User

46 properties

JSON SCHEMA

Scroll within the panel for all 14 ·

JSON Structure 14

JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.

JSON Structure definitions describing this provider's data shapes.

Clerk Actortoken Structure

0 properties

JSON STRUCTURE

Clerk Client Structure

0 properties

JSON STRUCTURE

Clerk Emailaddress Structure

0 properties

JSON STRUCTURE

Clerk Invitation Structure

0 properties

JSON STRUCTURE

Clerk Jwttemplate Structure

0 properties

JSON STRUCTURE

Clerk Oauthapplication Structure

0 properties

JSON STRUCTURE

Clerk Organization Structure

0 properties

JSON STRUCTURE

Clerk Organizationinvitation Structure

0 properties

JSON STRUCTURE

Clerk Organizationmembership Structure

0 properties

JSON STRUCTURE

Clerk Phonenumber Structure

0 properties

JSON STRUCTURE

Clerk Samlconnection Structure

0 properties

JSON STRUCTURE

Clerk Session Structure

0 properties

JSON STRUCTURE

Clerk Signintoken Structure

0 properties

JSON STRUCTURE

Clerk User Structure

0 properties

JSON STRUCTURE

Scroll within the panel for all 14 ·

Examples 26

Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.

Example request and response payloads for these APIs.

Scroll within the panel for all 26 ·

Security Posture 3

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.

Clerk Com Authentication

apiKey/http · 5 schemes

SECURITY

Clerk Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Clerk Com Vulnerability Disclosure

security.txt · contact published

SECURITY

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.

Clerk Com Agentic Access

426 operations · 273 acting · 16 human-in-the-loop

426 operations · 273 acting

AGENTIC

Resources

Every other property we hold for Clerk — 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.

Get Started 2

Portal, sign-up, and the first successful call

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

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/clerk-com · machine-readable index on apis.io

Where this information came from

This is an independent, third-party profile of Clerk, 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.