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  4. Clerk Authentication API
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Clerk Authentication API

The Clerk Authentication API provides developers with a robust solution for user authentication, including social login and multi-factor authentication, suitable for web and mobile applications.

Developed by Clerk Inc.

Live API
99.95%Uptime
120msLatency
4.2kStars
API KeyAuth
NoCredit Card
RESTStyle
v1Version

Reference

API Endpoints

Endpoints

Available routes, request structures, and code examples.

Creates a new authentication user

Endpoint URL
https://api.clerk.com/users
Code Example
curl -X POST 'https://api.clerk.com/users' \
  -H 'Authorization: Bearer YOUR_API_KEY'
Request Payload
{
  "password": "Str0ngP@ss!",
  "last_name": "Doe",
  "first_name": "John",
  "email_address": [
    "user@example.com"
  ]
}
Expected Response
{
  "id": "user_abc123",
  "created_at": 1689782400,
  "email_addresses": [
    {
      "email_address": "user@example.com"
    }
  ]
}
Version:v1
Limit:100 requests/minute

Integration

Quick Start

cURL ExampleREST
curl -X GET "https://api.clerk.com/v1/v1/signin"

Docs

Technical Documentation

What this API does

The Clerk Authentication API offers a comprehensive solution for managing user authentication in both web and mobile applications. It includes pre-built UI components for React and Next.js to expedite integration, and supports traditional email/password sign-up and sign-in, passwordless login via secure email links, and multi-factor authentication (MFA) to ensure enhanced account security.

How it works

Developers can integrate Clerk's API by utilizing its RESTful endpoints to manage user sessions and authentication processes. It supports social login providers such as Google, Facebook, and Apple, allowing users to access applications seamlessly. Additionally, organization management features help in managing user roles or team-based access, making the integration flexible for various use cases.

Authentication

Authentication involves obtaining an API key and making requests to the appropriate endpoints. Documentation for authentication methods and best practices can be found on the official documentation site.

Example usage

  • POST /api/v1/auth/signup - Registers a new user with email and password.
  • POST /api/v1/auth/login - Logs in a user via email/password or social login.
  • POST /api/v1/auth/verify - Verifies a user's email for passwordless login.
  • POST /api/v1/auth/mfa - Enables multi-factor authentication for an account.

Limits

The API allows for 10,000 free monthly active users (MAU), which provides a substantial entry point for testing and initial development without the need for payment.

Ideal use cases

  • Building applications requiring user account management with social login.
  • Integrating multi-factor authentication for enhanced security.
  • Creating customized user experiences with organization management.
  • Rapidly developing web and mobile applications using React or Next.js.

Examples

Real-World Applications

  • Implementing secure authentication in mobile and web applications.
  • Enhancing user security with multi-factor authentication.
  • Utilizing passwordless login options to improve user experience.
  • Customizing user onboarding with social login options.
  • Managing organization users and roles within applications.

Evaluation

Advantages & Limitations

Advantages
  • ✓ Pre-built React and Next.js components speed up development.
  • ✓ Supports a wide range of authentication methods including MFA and passkeys.
  • ✓ No credit card required to start using the free tier.
  • ✓ Seamless integration with social login providers for flexible user access.
Limitations
  • ✗ API Key authentication requires secure management of keys.
  • ✗ Limited native SDKs beyond JavaScript and TypeScript languages.
  • ✗ Higher tiers can be costly for large scale enterprise use.
  • ✗ Customization of email templates requires some learning curve.

Support

Frequently Asked Questions

Important Notice

Verify Before You Decide

Last verified · Apr 30, 2026

The details on this page — including pricing, features, and availability — are based on our last review and may not reflect the provider's current offering. Providers update their products frequently, sometimes without prior notice.

What may have changed

Pricing Plans
Features & Limits
Availability
Terms & Policies

Always visit the official provider website to confirm the latest pricing, terms, and feature availability before subscribing or integrating.

Check official site

External Resources

Documentation Official Website Pricing Details Postman Collection

API Specifications

v1
Pricing Model
Tiered subscription based on monthly active users
Credit Card
Not Required
Response Formats
JSON
Supported Languages
6 Languages
SDK Support
JavaScript, TypeScript
Rate Limit

1000 requests per minute

Time to Hello World

Less than 30 minutes for basic integration

Free Tier

10,000 monthly active users with access to all core authentication features including social login and MFA.

Best For

Startups, SMBs, and developers needing flexible, secure authentication with modern front-end integration.

Not Ideal For

Projects requiring extensive backend-only SDKs or SOAP API support.

Tags

#passkeys#social-login#clerk#nextjs#react#mfa#auth#saas#authentication

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