Reliable Transactional SMS API for Real-Time Indian Alerts
Trigger critical notifications, login OTPs, account debits/credits, and delivery status updates instantly 24x7 without DND dropouts or queue blockages.
POST /api/v1/otp/send HTTP/1.1
Host: nizorasms.com
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
{
"phone": "919876543210",
"template_id": "TPL_ACCT_ALERT",
"variables": {
"account": "XX4819",
"amount": "INR 5,000",
"type": "credited"
}
}Built for India's Most Critical Transactional Workflows
From fintech applications to e-commerce notifications, NizoraSMS delivers zero-latency alerts.
Banking & FinTech Alerts
Instant debit, credit, balance updates, and UPI authentication messages delivered with end-to-end cryptographic integrity.
E-Commerce Order Updates
Real-time order placed, packed, dispatched, and out-for-delivery tracking notifications that build customer confidence.
Healthcare & Diagnostics
Appointment reminders, doctor confirmations, and lab report download links sent directly to patient phones.
EdTech & Schools
Attendance alerts, examination schedules, fee payment receipts, and live student bus location links.
Logistics & Ride-Hailing
Driver assignment alerts, OTP verification before parcel handoff, and trip completion receipts.
Identity & 2FA Codes
Two-factor authentication codes for security logins, password resets, and account access authorization.
Frequently Asked Questions — Transactional SMS India
Key information regarding 24x7 delivery regulations, headers, and DND delivery.
What is Transactional SMS and how does it differ from Promotional SMS?
Transactional SMS is used for essential, non-marketing communications such as OTP verifications, order updates, account security alerts, and payment confirmations. Unlike Promotional SMS (which is blocked on DND numbers and restricted to 10 AM - 9 PM), Transactional SMS is delivered 24x7 round-the-clock to all mobile numbers, including DND/NDNC registered recipients.
What sender IDs (headers) are allowed for Transactional SMS in India?
In India, Transactional SMS utilizes 6-character alphabetic sender IDs approved on TRAI DLT portals (e.g., NZRSMS, HDFCBK, SWIGGY). NizoraSMS assists you in getting your brand header approved and binds it directly to your API requests.
Can Transactional SMS be delivered 24 hours a day?
Yes. As per TRAI guidelines, Service Implicit and Transactional SMS categories operate 24 hours a day, 7 days a week, 365 days a year with zero time restrictions.