Transactional SMS API · Live Live
Transactional SMS API for Real-Time Alerts
Send time-sensitive service and transactional notifications directly from your application, with API responses and delivery updates your systems can track.
Designed for Event-Driven Messaging
- Payment success and failure.
- Account activity.
- KYC and onboarding.
- Order status.
- Booking confirmation.
- Security notifications.
- Service incidents and urgent operational updates.
Keep Message Logic in Approved Templates
Use controlled templates instead of allowing arbitrary message content from every application. This reduces configuration drift, improves auditability and supports regulatory compliance.
Track Delivery Programmatically
Use Alert21 Message IDs and signed callbacks to update your own transaction records as a message moves from queued to delivered or failed.
Customer Experience Principle
Transactional messages should be concise, timely and directly connected to a real customer event. Avoid adding unrelated marketing content to service or transaction templates.
EVERY ALERT. ONE API.
Turn your next business event into a traceable alert.
Start with DLT-ready SMS today on Alert21’s developer-first communication platform.