Bulk OTP API
Send OTPs at scale with reliable delivery, idempotent sends, and real-time tracking. Perfect for applications with thousands of daily verifications.
Our API handles high throughput with wallet-based billing. Top up your wallet and send as many OTPs as you need without per-request payment friction.
Multi-provider routing ensures fast delivery even at high volumes. If one provider is slow or overloaded, we automatically route through an alternative.
Full delivery tracking for every OTP sent. Monitor delivery rates, identify failures, and get complete audit trails via the Messages API.
Idempotency keys prevent duplicates even during bulk operations. Safe to retry failed requests without worrying about double-sends.
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",
"otp": "123456",
"idempotencyKey": "unique-request-id-123"
}'Bulk OTP FAQ
Related Pages
Send OTPs at Scale
Top up your wallet and start sending. No rate limit negotiations, no contracts.