SMS API (Transactional, Promotional, OTP)
NobleStack's SMS API delivers transactional, promotional, and OTP messages to your customers reliably and at scale. With a single integration you get high-throughput sending, real-time delivery tracking, and built-in DLT compliance — so your messages land on time, every time.
Transactional
Alerts, confirmations, notifications
Promotional
Offers, campaigns, announcements
OTP
High-speed delivery, priority routing
One API for Every SMS
From one-time passwords that must arrive in seconds to promotional blasts that reach millions, our SMS API is built for speed and reliability. Intelligent routing across trusted operator connections keeps delivery rates high, while a simple REST interface makes integration into any app or CRM straightforward.
Features & Capabilities
- Transactional SMS for alerts, confirmations, and notifications
- Promotional SMS for offers, campaigns, and announcements
- High-speed OTP delivery with priority routing
- Unicode and regional-language messaging for wider reach
- Real-time delivery receipts and detailed reporting dashboards
- Scheduled sending, throttling, and personalised template support
- Two-way SMS with long and short codes for interactive campaigns
- Robust REST API with SDKs, plus SMPP for high-volume senders
Built-In Compliance
Navigating TRAI regulations is complex — we make it simple. NobleStack helps you register on the DLT platform, get sender IDs (headers) and content templates approved, and stay compliant with promotional and transactional messaging rules, so your campaigns run without delivery blocks or penalties.
Ideal For
- E-commerce order, shipping, and delivery updates
- Banking and fintech OTPs and account alerts
- Healthcare appointment and prescription reminders
- Retail and D2C promotional offers and loyalty messaging
How It Works
From API Call to Delivery Receipt
Transactional, promotional, and OTP traffic on one integration — with DLT compliance and delivery tracking built into the same pipeline.
Register
DLT and template setup
We register your entity, sender IDs, and message templates so your traffic clears operator filters instead of silently dropping.
Integrate
One endpoint, any message type
Send single or bulk messages over REST or SMTP-style bulk upload. The same call handles transactional, promotional, and OTP routes.
Deliver
High-throughput routing
Messages route over redundant operator connections with priority lanes for OTP and transactional traffic, so time-critical SMS is not queued behind campaigns.
Track
Real-time DLRs and analytics
Delivery receipts stream back over webhooks with per-operator, per-template breakdowns and failure reasons you can act on.
99.95%
Platform uptime SLA
7Cr+
Daily OBD handled
500+
Businesses onboarded
24×7
Engineering support
Talk to us
Talk to our team about what you are building
Tell us the workflow you have in mind and the scale you expect. Our solutions team maps it to the right NobleStack setup, flags anything that needs a custom approach, and sends you pricing for your volume — no obligation.
Same-day response
Weekday enquiries get a reply within business hours.
A specialist, not a script
You speak to someone who has actually shipped this kind of setup.
Compliance answers upfront
Consent, data residency, retention, and audit questions covered early.