Clerk Auth API
Authentication & Security
Complete authentication & user management platform for Next.js and React with 10,000 free MAUs
Clerk Auth API Highlights
Clerk Auth API is best for next.js, React, and full-stack developers wanting drop-in, beautiful authentication and B2B user management
Bearer Token (Secret Key + Publishable Key)
High-scale serverless edge session verification
Nigeria
Ghana
Kenyajs, Remix, and full-stack web applications. It replaces outdated, brittle auth flows with beautiful, customizable drop-in UI components (`<SignIn />`, `<SignUp />`, `<UserProfile />`, `<OrganizationSwitcher />`) that can be integrated in minutes.
Clerk natively supports passwordless email/SMS OTPs, passkeys (Touch ID / Face ID), multi-factor authentication (TOTP), social logins (Google, Apple, GitHub, Microsoft), and enterprise SAML SSO. js developers.
Clerk Auth API Core Features & Capabilities
| Feature | Status | Description & Capabilities |
|---|---|---|
| Email Address Verification | ✓ Supported | Provides native Email Address Verification capabilities integrated within the API. |
| Phone Number Validation & Carrier Lookup | ✓ Supported | Provides native Phone Number Validation & Carrier Lookup capabilities integrated within the API. |
| Two-Factor Authentication (2FA / OTP) | ✓ Supported | Generate and verify time-based or SMS/email OTP codes to secure customer logins and transfers. |
| OAuth 2.0 / SSO Integration | ✓ Supported | Provides native OAuth 2.0 / SSO Integration capabilities integrated within the API. |
| Password / Breach Detection | ✓ Supported | Provides native Password / Breach Detection capabilities integrated within the API. |
| IP & Domain Reputation Scoring | ✓ Supported | Provides native IP & Domain Reputation Scoring capabilities integrated within the API. |
| Sandbox / Test Environment | ✓ Supported | Dedicated testing sandbox with mock data and test credentials for staging development. |
| Phishing & Malware URL Detection | ✗ Not Supported | Phishing & Malware URL Detection is currently not supported by Clerk Auth API. |
- Free tier includes up to 10,000 Monthly Active Users (MAUs), unlimited logins, social OAuth providers, multi-factor auth (MFA), and prebuilt components
- Paid plans from $25/month for custom domains and higher scale
Required Access Documents for Clerk Auth API
- Clerk AccountRequiredSign up at dashboard.clerk.com to create an application and retrieve keys
Different Clerk Auth API use cases
- Next.js App Authentication:Protect App Router routes and API endpoints with Clerk's edge middleware and user hooks.
- B2B SaaS Multi-Tenant Workspaces:Allow business customers to create teams, invite members, and assign custom admin roles.
- Frictionless Passwordless Onboarding:Authenticate users with Google 1-tap, Apple ID, and Face ID passkeys.