Power user authentication, login 2FA, and registration verification with scalable REST APIs and multi-carrier redundant routing.
Priority queue routing delivers verification codes in 1–3 seconds with high route availability.
Carrier-approved transactional pathways ensure regulatory compliance and high delivery success.
Usage-based volume pricing designed for growing application traffic without hidden charges.
Under TRAI guidelines in India, OTP (One-Time Password) delivery for authentication, user onboarding, and two-factor verification utilizes pre-approved Service Implicit transactional routes.
BLACKSMS manages carrier connections and pre-approved sender infrastructure so developers can integrate OTP workflows directly into web and mobile applications with minimal friction.
curl -X POST https://blacksms.in/sms \
-H "Authorization: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"numbers": "9876543210",
"message": "Your verification code is 482910. Valid for 10 minutes. -BLACKSMS"
}'| Tier | Recharge Commitment | Price per SMS | Credit Validity |
|---|---|---|---|
| Starter | ₹100 - ₹3,999 | ₹0.30 | Unlimited |
| Growth | ₹4,000 - ₹13,999 | ₹0.25 - ₹0.27 | +6 Months |
| Scale | ₹14,000 - ₹129,999 | ₹0.21 - ₹0.23 | +12 Months |
| Enterprise | ₹130,000+ | ₹0.15 - ₹0.19 | +24 Months |
BLACKSMS routes verification messages through dedicated transactional queues with direct operator pathways across Jio, Airtel, BSNL, and Vi networks.
BLACKSMS uses transparent, usage-based volume pricing starting at ₹0.30 per SMS with no setup fees, monthly minimums, or hidden platform charges.
OTP verification messages are dispatched immediately upon API request with average delivery latency under 3 seconds.
Full REST API endpoints, parameter specifications, and code snippets are available in our API documentation.
Simple REST API. Transparent volume pricing. 24/7 technical support.
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