Reauth
🆓 Free WhatsApp OTPs

Free WhatsApp OTP Authentication

Send unlimited WhatsApp OTPs for user authentication with just 2 simple APIs. Perfect for startups and developers who want quick verification without SMS fees or complex setups.

reauth.in/api
// Send OTP
POST /send-otp
{ "phone": "+1234567890" }
// Returns: verification_code": "abc123xyz
// Verify OTP
POST /verify-otp
{ "verification_code": "abc123xyz", "otp": "123456" }

🔐 Key Features

Everything you need for seamless WhatsApp authentication

✅ Free WhatsApp OTPs
Send unlimited OTPs via WhatsApp without any cost. No hidden fees or usage limits.
⚡ Fast & Simple Integration
Just 2 API calls to implement complete OTP authentication. Get started in minutes, not hours.
🚫 No Official WhatsApp Business API
No need for complex WhatsApp Business API setup, approvals, or business verification.
🌐 No Phone Carrier Limitations
Works globally without carrier restrictions. Reach users anywhere WhatsApp is available.
👨‍💻 Developer-Friendly
Clean, lightweight APIs with comprehensive documentation. Built by developers, for developers.
📲 High Delivery Rate
WhatsApp's high engagement rates ensure your OTPs reach users instantly and reliably.

📲 How It Works

Simple 2-step process to implement WhatsApp OTP authentication

1
Send OTP API
Sends a one-time password to the user's WhatsApp number and returns a verification code
// Send OTP Request
curl -X POST
  https://api.reauth.in/send-otp
  -H "Content-Type: application/json"
  -d { "phone": "+1234567890" }
// Response
{ "verification_code": "abc123xyz", "status": "sent" }
2
Verify OTP API
Verifies the OTP entered by the user using the verification code from step 1
// Verify OTP Request
curl -X POST
  https://api.reauth.in/verify-otp
  -H "Content-Type: application/json"
  -d { "verification_code": "abc123xyz", "otp": "123456" }
// Response
{ "verified": true, "status": "success" }

💡 Perfect For

Ideal use cases for WhatsApp OTP authentication

Login/Signup Flows

Streamline user onboarding with instant WhatsApp verification

Passwordless Authentication

Enable secure login without passwords using OTP verification

Two-Factor Security

Add an extra layer of security to sensitive operations

🚀 Simple Pricing

Start sending free WhatsApp OTPs in minutes

🆓
Free Forever
Perfect for startups and developers
$0
Unlimited WhatsApp OTPs
2 Simple APIs
Global Coverage
No Setup Required
Developer Support

Ready to Get Started?

Join thousands of developers using Reauth for WhatsApp OTP authentication