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🔔 Transactional SMS

Every Order, Payment & Alert Delivered Instantly

Send order confirmations, payment alerts, shipping updates and account notifications that reach customers 24×7 - even on DND numbers. DLT compliant, 99.9% delivery, REST API ready.

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2–3s
Average Delivery Time
99.9%
Delivery Rate
24×7
Bypasses DND Restrictions
5,000+
Businesses Trust Nesark
Types of Transactional SMS
Order Updates
Confirmed · Shipped · Delivered
Payment Alerts
Instant, DND-exempt delivery
Appointment Reminders
Reduce no-shows automatically
Multi-Channel Alerts

See How a Transactional Alert Looks on Every Channel

Click any channel below to see exactly what your customer receives — and choose the best fit for your product.

9:41
▐▐▐ ◀ ●
Messages · NESARK
Your order #NSK10234 has shipped.
Arriving today by 8 PM.
Track: nesark.in/trk
-Nesark
9:41 AM ✓
Channel 1 of 3

SMS Alert

Widest reach in India — works on every mobile phone without internet. Delivered in 2–3 seconds via priority transactional route, bypassing DND restrictions.

✓
Works without internet
Reaches all mobile users across India
✓
Bypasses DND restrictions
Transactional route — 24×7 delivery
✓
Delivered in 2–3 seconds
Priority route, no queuing behind promos
Types of Transactional SMS

Every Service Notification, Covered

If it's triggered by a user action or account event, it qualifies as transactional — and Nesark delivers it instantly.

Order & Shipping Updates
Order confirmed, packed, shipped, out for delivery — keep customers informed at every step.
Payment & Billing Alerts
Payment received, invoice generated, subscription renewed, EMI due — instant financial notifications.
Appointment Reminders
Doctor visits, salon bookings, service appointments — reduce no-shows with timely reminders.
Account & Security Alerts
Login alerts, password changes, OTPs and suspicious activity warnings — delivered without delay.
Delivery & Logistics Updates
Real-time tracking notifications for cab arrivals, courier pickups and delivery confirmations.
Subscription & Renewal Reminders
Plan expiring, renewal due, membership ending — give customers a heads-up before it lapses.
Why Transactional SMS

The Only Channel That Bypasses DND

Promotional messages get blocked on DND numbers and are restricted to daytime hours. Transactional SMS reaches every customer, any time, because it relates to a service they've already engaged with.

24×7 Delivery, No Time Window
Unlike promotional SMS, transactional messages send at any hour — day or night.
Bypasses DND Restrictions
Reaches numbers registered on DND, since it's tied to a service the customer opted into.
Priority Routing
Transactional traffic never queues behind promotional campaigns — it moves first.
Real-Time Delivery Reports
Track sent, delivered and failed status for every message via dashboard or webhook.
Transactional vs. Promotional SMS
24×7
Transactional SMS delivery window — no restrictions, no DND blocks
Promotional SMS (10 AM–9 PM, no DND)11 hrs
Transactional SMS (24×7, incl. DND)24 hrs
Typical SMS Open Rate90%+
✓ DLT Registered ✓ TRAI Compliant ✓ 99.9% Delivery
Ready to Switch to Transactional SMS?

Send your first order, payment or alert SMS in minutes — free credits to get started, no setup fees.

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Developer Friendly

Trigger Transactional SMS From
Your Backend

Fire a transactional SMS the moment an order, payment or account event happens — one REST API call from your existing backend logic.

REST API with JSON response
PHP, Python, Node.js, Java SDKs available
Webhook support for delivery callbacks
Sandbox environment for testing
View API Documentation →
Payload
cURL
// Request { "sender": "NESARK", "to": "91XXXXXXXXXX", "text": "Your order #NSK10234 has been shipped and will arrive today by 8 PM.", "type": "TRANS" } // Response { "id": "71ac94f0-XXXX-XXXX-XXXX", "totalCount": 1, "message": "Message Sent Successfully!", "error": null }
How It Works

From Event to SMS in Seconds

Wire it once into your backend — every future event notifies your customer automatically.

STEP 01
Event Happens
An order is placed, a payment clears, or an appointment is booked in your system.
STEP 02
Your Backend Calls Nesark
A single POST request sends the message text and customer number to our API.
STEP 03
Nesark Delivers It
Routed through priority channels, the SMS lands in 2–3 seconds — DND included.
STEP 04
You Track the Result
See delivered/failed status instantly via dashboard or your own webhook endpoint.
Use Cases

Where Businesses Rely on Transactional SMS

Any business with an order, payment or account flow depends on transactional SMS to keep customers informed.

E-Commerce & Retail
Order confirmations, shipping updates, delivery OTPs and return/refund status notifications.
BFSI & Fintech
Transaction alerts, EMI reminders, low-balance warnings and fraud/security notifications.
Healthcare
Appointment confirmations, lab report ready alerts and prescription refill reminders.
Logistics & Delivery
Pickup confirmations, live tracking links, out-for-delivery and delivery-completed alerts.
Travel & Hospitality
Booking confirmations, check-in reminders, flight/train status and cancellation alerts.
SaaS & Enterprise Apps
Billing receipts, plan renewal reminders, usage-limit alerts and account activity notifications.
FAQ

Common Questions About Transactional SMS

Everything you need to know before sending your first transactional alert.

Transactional SMS is used to send non-promotional, service-related messages triggered by a user action or account event — such as order confirmations, payment alerts, shipping updates, appointment reminders and OTPs. It's delivered 24×7 and bypasses DND restrictions.

Transactional SMS is sent 24×7, bypasses DND restrictions and is delivered within seconds via priority routes. Promotional SMS is used for marketing, is blocked on DND numbers, and can only be sent between 10AM–9PM. Order updates, OTPs and alerts must always use the Transactional route.

Yes. As per TRAI regulations, all transactional SMS senders and templates must be registered on the DLT platform before sending. Nesark assists with the entire registration process free of charge.

Yes. Transactional SMS is exempt from DND restrictions since it relates to a service the customer has already opted into, such as an order, payment or account action.

Nesark delivers transactional SMS in 2–3 seconds on average, routed through priority channels separate from promotional traffic, at any hour of the day.

No. Credits purchased on Nesark do not expire and can be used for transactional SMS at any time.

Never Leave a Customer Wondering

Start sending transactional SMS today — free trial credits, no setup fee, no contracts.

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