Send OTPs Without DLT Registration
The most developer-friendly OTP API for India. Authenticate users in minutes with our high-delivery SMS infrastructure. 4-6 digit OTP support, multi-provider failover, and zero DLT registration — all at just ₹0.25 each.
Free to sign up. 40 test messages credited on signup. Pay only for what you send.
Everything You Need to Send OTPs
A complete OTP platform designed for Indian developers who want reliability without complexity.
Skip the weeks-long DLT registration process. We handle all compliance so you can focus on building.
Sign up, get your API key, and start sending OTPs. No paperwork, no approvals, no waiting.
One POST request to send an OTP. Clean JSON responses. Works with any language or framework.
Automatic failover between SMS providers ensures your OTPs always get delivered.
Built-in idempotency keys prevent duplicate OTP sends even with network retries.
No monthly fees. Add funds to your wallet and pay Rs 0.25 per OTP sent.
Track every message with delivery status updates. Full audit trail for all OTP requests.
OTP codes are bcrypt-hashed. API keys are SHA-256 hashed. Your data is always protected.
Send an OTP in One API Call
Works with every language. Just a single POST request.
curl -X POST https://api.startmessaging.com/otp/send \
-H "Content-Type: application/json" \
-H "X-API-Key: sm_live_your_api_key_here" \
-d '{
"phoneNumber": "+919876543210",
"templateId": "YOUR_TEMPLATE_ID",
"variables": {
"otp": "123456",
"appName": "YourApp"
}
}'How It Works
Go from zero to sending OTPs in three simple steps.
Get Your API Key
Sign up and create an API key from the dashboard. It takes less than a minute.
Top Up Your Wallet
Add funds to your wallet via Razorpay. Pay as you go for each OTP you send.
Send OTPs
Make a single POST request to our API. We handle delivery, retries, and tracking.
Frequently Asked Questions
Ready to Start Sending OTPs?
Sign up for free, get 40 test messages credited instantly, and send your first OTP in under 5 minutes. No DLT registration needed.