Send OTP SMS in India instantly without DLT registration. 99.9% delivery rate, REST API, free trial. India's most affordable OTP SMS gateway.
OTP delivered in 1–3 seconds. Multiple gateway routes for 99.9% uptime.
Send OTP SMS without DLT registration. Skip the DLT process entirely for OTP use cases.
India's cheapest OTP SMS rate. Get ₹10 free credits on signup — no credit card needed.
DLT (Distributed Ledger Technology) is a TRAI mandate for promotional and transactional bulk SMS in India. However, for OTP (One-Time Password) delivery — used in login, signup, and two-factor authentication — BLACKSMS provides a simplified gateway that does not require DLT registration.
This means Indian businesses, startups, and developers can start sending OTP SMS immediately — no paperwork, no waiting, no DLT registration delays. Just sign up, get your API key, and send your first OTP within minutes.
curl -X POST https://blacksms.in/sms \
-H "Authorization: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"numbers": "9876543210",
"message": "Your OTP is 482910. Valid for 10 minutes. -BLACKSMS"
}'| Plan | SMS Credits | Price per SMS | Total Price |
|---|---|---|---|
| Starter (Free) | ₹10 credits (~33 SMS) | ₹0.30 | FREE |
| Basic | 1,000 SMS | ₹0.30 | ₹300 |
| Standard | 10,000 SMS | ₹0.28 | ₹2,800 |
| Business | 1,00,000 SMS | ₹0.25 | ₹25,000 |
Yes! BLACKSMS allows you to send OTP SMS without DLT registration. OTP SMS for login verification, 2FA, and user authentication does not require DLT registration when sent through BLACKSMS.
BLACKSMS offers OTP SMS from just ₹0.30 per message — among the cheapest rates in India. You also get ₹10 free credits on signup to test the service.
Our OTP SMS delivery is instant — typically within 1 to 3 seconds. We use premium routes across all Indian telecom networks (Jio, Airtel, BSNL, Vi).
Yes. BLACKSMS provides a simple REST API that works with any programming language. We have code examples for PHP, Python, Node.js, Java, and cURL. Check our API documentation.
No DLT required. ₹10 free credits. No credit card needed.
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