🔐 Mission-Critical OTP & Transactional SMS
Deliver OTPs in
Under 3 Seconds
— Guaranteed
No.1 fastest Transactional & OTP SMS platform — sub-3-second delivery, 99.99% uptime, 24/7 unrestricted sending, and dedicated priority routes for banks, fintechs, e-commerce, and healthcare platforms.
<3sec
OTP Delivery
99.99%
Delivery Rate
24/7
No Restrictions
⚡ OTP Delivered
Priority Route · Sub-3 Second Delivery
📱 MYBANK OTP
Your OTP for login is:
7 4 2 8 1 9
Valid for 10 minutes. Do not share with anyone.
2:47 PM · Delivered ✓✓
🛒 SHOPEZY ALERT
Order #ORD9284 confirmed! $14 paid. Delivery by Tue 11 Mar. Track: bit.ly/xyz
2:47 PM · Delivered ✓✓
Delivered in 1.8 seconds
What Is It
What is Transactional & OTP SMS?
Transactional SMS delivers critical, time-sensitive messages — OTPs, order alerts, payment confirmations, appointment reminders, and security notifications.
- ✓Delivered 24/7 — no time window restrictions like promotional SMS
- ✓Sub-3 second delivery on priority routes for OTP use cases
- ✓99.99% delivery rate with multi-route intelligent failover
- ✓End-to-end encrypted transmission for sensitive data
<3s
OTP Delivery Speed
99.99%
Delivery Rate
24/7
Unrestricted Sending
256-bit
SSL Encryption
Features
Built for Speed, Security & Scale
Every feature engineered for mission-critical delivery — because a failed OTP means a lost customer.
Sub-3 Second OTP Delivery
Dedicated priority routes bypass standard queues to deliver OTPs in under 3 seconds. Our infrastructure processes 10,000+ OTPs per second with intelligent load balancing across Jio, Airtel, Vi, and BSNL.
Intelligent Failover Routing
Real-time delivery monitoring with automatic route switching in milliseconds. If primary route shows degraded performance, our system shifts traffic to backup Tier-1 routes before you even notice — maintaining 99.99% SLA.
Bank-Grade Security
256-bit SSL encryption on all API connections. TLS 1.3 in transit, AES-256 at rest. ISO 27001 certified infrastructure with SOC 2 Type II compliance. Penetration tested quarterly by independent security firms.
Developer-First REST API
RESTful API with SDKs for PHP, Python, Node.js, Java, .NET, Ruby, and Go. Comprehensive documentation, sandbox environment, real-time webhooks, and Postman collection. Integration in under 2 hours guaranteed.
Real-Time Delivery Webhooks
Instant HTTP callbacks for every delivery event — delivered, failed, pending.Build retry logic and fallback flows in your app. Per-message latency tracking down to millisecond precision.
Global Transactional Delivery
Send transactional SMS to 160+ countries with local number routing. Global OTP delivery for international user bases with country-specific compliance, local sender IDs, and regional carrier agreements.
Advanced Analytics & SLA Reports
Track OTP delivery success rates, average latency, operator-wise performance, and peak load statistics. Automated SLA breach alerts via email/Slack. Exportable reports for compliance and audit purposes.
Developer API
Integrate OTP SMS in Minutes
Simple REST API with SDKs for all major languages. Send your first OTP in under 10 lines of code. Full documentation, sandbox environment, and live code examples included.
- ✓RESTful API — works with any language or framework
- ✓SDKs: PHP, Python, Node.js, Java, .NET, Ruby, Go
- ✓Sandbox mode for development & testing — free
- ✓Webhook callbacks for real-time delivery status
- ✓99.9% API uptime SLA with status page monitoring
- ✓Postman collection + OpenAPI 3.0 spec available
// Send OTP via CheapSMS REST API
POST https://api.cheapsms.com/v2/send
{
"apikey": "YOUR_API_KEY",
"sender": "MYBANK",
"to": "919876543210",
"type": "OTP",
"message": "Your OTP is {#var#}. Valid for 10 mins. -MYBANK",
"var1": "742819"
}
// Response
{
"status": "success",
"msgid": "CSMS20240307001",
"delivered": "true",
"latency": "1.8s",
}
PHP
Python
Node.js
Java
.NET
Go
Process
How OTP SMS Delivery Works
From API call to phone buzzing — our optimized 4-stage delivery pipeline ensures every OTP lands in under 3 seconds.
1
API Call Received
Your app sends an API request with the OTP and recipient number. Our load balancer accepts and queues it in under 50ms with acknowledgment response.
2
Route Optimization
AI-powered routing engine selects the fastest carrier route based on real-time latency, delivery rates, and network conditions for that specific operator.
3
Carrier Submission
OTP submitted directly to Tier-1 carrier gateway on dedicated SMPP connection. No shared queues — your OTP goes on the priority lane every time.
4
Delivery Confirmed
Carrier returns delivery receipt. We fire your webhook instantly with delivery status, latency, and network details. Total time: under 3 seconds.
Use Cases
Every Critical Alert & Notification
From login OTPs to delivery alerts — transactional SMS powers every customer-facing operation that demands instant, reliable delivery.
Login & 2FA OTP
Secure user authentication with sub-3 second OTP delivery. Supports TOTP, HOTP, and custom OTP formats for all authentication flows.
Payment Confirmation
Instant payment success/failure alerts, transaction IDs, and digital receipts. Critical for UPI, NEFT, IMPS, and card payment flows.
Order & Shipping Alerts
Order placed, dispatched, out-for-delivery, and delivered notifications. AWB numbers, tracking links, and delivery partner details in real time.
Appointment Reminders
Doctor, salon, and service appointment confirmations and reminders. Reduce no-shows by 40% with automated 24-hour and 1-hour reminder SMS.
Bank & Finance Alerts
Account credit/debit alerts, loan EMI reminders, FD maturity notices, credit card statements, and fraud detection notifications.
KYC Verification
Identity verification OTPs for onboarding flows, Aadhaar-linked OTPs, video KYC session codes, and document upload confirmations.
Exam & Result Alerts
Exam hall ticket OTPs, admit card downloads, result declarations, admission confirmations, and fee payment receipts for educational platforms.
System & Security Alerts
Critical system alerts, password reset links, account activity notifications, suspicious login warnings, and device authorization codes.
Industries
Trusted Across Every Critical Industry
Any business handling user authentication, payments, or time-sensitive notifications relies on our transactional SMS infrastructure.
Banking & NBFCs
Net banking OTPs, fraud alerts, EMI reminders
Fintech & Payments
UPI OTPs, wallet transactions, KYC verification
E-commerce
Order alerts, delivery updates, return OTPs
Healthcare
Appointment OTPs, prescription alerts, lab reports
Gaming & Fantasy
Login OTPs, deposit alerts, win notifications
EdTech
Registration OTPs, exam alerts, result SMS
PropTech
Site visit OTPs, booking confirmations, payment alerts
Mobility & Logistics
Driver OTPs, ride alerts, delivery confirmations