Platform Status: Operational

Reliable OTP &
Verification APIs
for Modern Applications

Send email OTP, verify users, and secure your applications with production-ready APIs. Built for developers who demand reliability.

Start Building Read the Docs

Send OTP

// Send an OTP to your user

const response = await fetch('https://api.clashup.site/api/v1/otp/send', {

method: 'POST',

headers: {

'X-API-Key': 'cu_live_your_api_key',

'Content-Type': 'application/json'

body: JSON.stringify({

channel: 'email',

recipient: 'user@example.com'

})

});

Everything You Need to
Verify & Authenticate

A complete suite of verification and authentication APIs designed for modern applications.

Email OTP

Send one-time passwords via email with customizable templates, expiration, and attempt limits.

API Key Management

Secure API keys with automatic hashing, rotation, revocation, and per-key usage tracking.

Security Built In

Rate limiting, brute force protection, hashed OTP storage, and comprehensive audit logging.

Real-time Analytics

Track every API request, OTP delivery, and verification in real-time with detailed dashboards.

Webhooks

Get real-time notifications for OTP events, payments, and account changes via HMAC-signed webhooks.

Multi-App Support

Create multiple applications, each with their own API keys, usage limits, and analytics.

How It Works

Three simple steps to get started

Create an Application

Integrate the API

Use your API key to send OTP requests and verify codes with simple REST API calls.

Monitor & Scale

Track delivery, verification rates, and API usage in real-time from your dashboard.

Developer-First
API Design

Clean, well-documented REST APIs with consistent response formats, proper error handling, and comprehensive examples.

RESTful API with versioning (v1)
API key authentication with X-API-Key header
Standardized JSON responses
Rate limiting and usage tracking
HMAC-SHA256 signed webhooks

View Documentation

API Response

{
  "success": true,
  "message": "OTP sent successfully",
  "statusCode": 200,
  "data": {
    "requestId": "a1b2c3d4-...",
    "channel": "email",
    "recipient": "user@example.com",
    "status": "pending",
    "expiresAt": "2025-01-01T00:10:00Z"
  }
}

Enterprise-Grade Security

Every layer of CLASHUP is designed with security as a priority.

Hashed Storage

OTPs and API keys are hashed before storage

Rate Limiting

Multi-layer protection against abuse

Audit Logging

Every action tracked and auditable

DKIM & SPF

Authenticated email delivery

Built for Every Use Case

User Registration

Verify email addresses during sign-up to reduce fake accounts and improve user quality.

Two-Factor Authentication

Add an extra layer of security to user logins with email-based OTP verification.

Transaction Verification

Confirm sensitive operations like payments, transfers, or account changes with OTP.

Password Recovery

Secure password reset flows with time-limited verification codes.

Order Confirmation

Verify customer identity before processing orders or deliveries.

Account Changes

Require verification before allowing changes to email, phone, or payment methods.

Reliable OTP & Verification APIs for Modern Applications

Everything You Need toVerify & Authenticate