Secure SMS OTP Verification API | Fast & Reliable

Why Choose iSMS for OTP Delivery?

Mobile App Ready

Perfect for Android and iOS applications requiring phone number verification. Our API integrates seamlessly with your mobile apps.

Instant Delivery

High delivery accuracy with messages arriving in under 5 seconds — ideal for critical, time-sensitive OTP validations.

Bank-Level Security

Trusted by financial institutions for secure authentication. End-to-end encrypted delivery for your OTP codes.

Detailed Reporting

Real-time delivery reports and analytics to monitor your OTP success rates and performance.

Global Reach

Send OTPs to Singapore, Malaysia, Philippines and 200+ countries worldwide with our extensive network.

Cost Effective

Competitive pricing with volume discounts available. Pay only for delivered OTP messages.

Simple API Integration

Our RESTful API makes it simple to integrate SMS OTP functionality into your applications

Developer Friendly OTP API

Our RESTful API makes it simple to integrate SMS OTP functionality into your applications:

Simple HTTP/HTTPS requests
Comprehensive documentation
Sample code for all major languages
Sandbox environment for testing
Webhook support for delivery notifications

Quick Implementation

Most developers can implement our OTP API in less than 1 hour. We provide ready-to-use code snippets for:

Android (Java/Kotlin)
iOS (Swift/Objective-C)
Web Applications (JavaScript, PHP, Python, etc.)

Sample API Request

POST
/api/send_otp HTTP/1.1
Host: api.isms.com.my
Content-Type: application/json

{
  "apikey": "your_api_key",
  "mobile": "60123456789",
  "message": "Your verification code is {code}",
  "senderid": "YOURAPP",
  "code_length": 6,
  "expiry": 300
}

This simple request will trigger an OTP SMS to be sent to the specified mobile number.

How Our OTP Service Works

User Requests OTP

User enters their mobile number in your app or website and requests verification.

API Call to iSMS

Your system calls our API with the user's mobile number and OTP parameters.

OTP SMS Sent

We generate a unique code and deliver it via SMS to the user's phone.

User Verification

User enters the received code in your app to complete verification.

Advanced OTP Features

Customization

4-8 digit code length
Customizable SMS templates
Multiple language support
Branded sender IDs

Expiry Control

Configurable expiry time (1-30 minutes)
Automatic code invalidation
Resend limitations
Rate limiting protection

Analytics

Real-time delivery reports
Success/failure tracking
API call logs
Performance analytics

Enhanced with U20.Me Integration

iSMS now partners with U20.Me to provide additional value-added services

URL Shortener

Include shortened links in your OTP messages when additional verification steps are required.

Unsubscribe System

Compliance-friendly opt-out mechanism for non-OTP communications.

QR Code Generation

Combine OTP with QR codes for enhanced two-factor authentication flows.

Address Book Sync

Automatically maintain updated contact lists across platforms.

Secure Mobile Verification with SMS OTP