Bulk SMS API for Business Applications in India

HTTP and XML API for DLT-registered businesses in India: transactional, promotional and OTP routes with template variables, schedule IDs, delivery reports and balance checks. API credentials are issued after business KYC.

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Bulk SMS API Quick Start

One HTTPS GET request sends a DLT-templated message. Every accepted message returns a schedule ID that you use to fetch delivery reports. The API host and your credentials are shared after onboarding.

1. Send a templated (DLT) message

GET https://<api-host>/sms/user/urlsmstemp.php
    ?username=YOUR_USER
    &pass=YOUR_PASSWORD
    &senderid=KAPSYS          # DLT-registered header
    &dest_mobileno=91XXXXXXXXXX
    &tempid=1107xxxxxxxxxxxxxx  # approved DLT template ID
    &F1=482913&F2=10         # values for {#var#} fields, in order
    &mtype=txt
    &response=Y
# response: one schedule ID per message
5068570-2026_09_28

2. Send a plain text message (promotional route)

GET https://<api-host>/sms/user/urlsms.php
    ?username=YOUR_USER&pass=YOUR_PASSWORD
    &senderid=KAPSYS
    &dest_mobileno=9198XXXXXXXX,9197XXXXXXXX   # up to 300 numbers per request
    &message=Your+URL-encoded+message
    &response=Y

3. Delivery reports, balance and password

# delivery report for one or more schedule IDs
GET /sms/user/response.php?Scheduleid=5068570-2026_09_28,5068571-2026_09_28
# account balance
GET /sms/user/balance_check.php?username=YOUR_USER&pass=YOUR_PASSWORD
Your Balance is : 1212
# change API password
GET /sms/user/change_password.php?username=&oldpassword=&newpassword=

4. High-volume XML API (POST)

POST https://<api-host>/prepaidgetbroadcast/prepaidxmlapi
<push>
  <userid>YOUR_USER</userid><pwd>YOUR_PASSWORD</pwd>
  <ctype>1</ctype><sender>KAPSYS</sender>
  <multisms>
    <detail msgid='1001' msgtxt='Your message' siurl='NA'>
      <to id='1' pno='9198XXXXXXXX'/>
      <to id='2' pno='9197XXXXXXXX'/>
    </detail>
  </multisms>
  <dlr>1</dlr>      <!-- 1 = delivery report -->
  <alert>1</alert>  <!-- 1 = transactional/alert, 0 = promotional -->
</push>

Request parameters

Parameter	Meaning
username, pass	API account credentials issued after business KYC
senderid	Your DLT-registered header (6 characters) mapped to the account
dest_mobileno	Destination number with or without 91 / +91; comma-separated for multiple recipients (max 300 per request)
tempid	Numeric ID of the approved DLT content template
F1, F2, F3 …	Values for the template's {#var#} placeholders, in order (OTP, amount, name, validity and so on)
message	URL-encoded text for non-templated routes; Unicode supported for Hindi and regional languages
mtype	txt for text messages
response	Y to receive the schedule ID and submission date in the response

Return values

Response	Meaning
<scheduleid>-<date>	Message accepted; use the schedule ID for delivery reports
Invalid Username and Password	Authentication failed
Invalid SenderID	Header not registered or not mapped to the account
You have Exceeded your SMS Limit	Insufficient balance for the request
Account is Expire	Account validity has ended
Message is blank	No message or template variables in the request
007-<date> / 001-<date>	Number is on DND (promotional route) / number invalid

Sample code in PHP, Python, Node.js and cURL, the API host and a sandbox login are shared with your credentials. Integration support is available from our technical team at support@kapsystem.com.

Why Choose KAPSYSTEM’s Bulk SMS API?

At KAPSYSTEM, we make your bulk SMS integration reliable and effective with comprehensive support to optimize your messaging strategy without complexity.

Easy Integration: Our Bulk SMS API is designed to integrate with your existing software—be it a CRM, e-commerce platform, mobile application, or website. The full specification and a sandbox login are shared with your credentials, so your developers can test before going live.
Priority Routes and Delivery Reports: Transactional alerts and OTPs run on priority routes; every message returns a schedule ID and a delivery report so your system can retry or escalate. Whether you’re sending a single text or thousands in one go, you can track every message end to end.
Scalable for Businesses of All Sizes: Whether you’re a small business that sends a few hundred messages per month or a larger enterprise dealing with millions of messages daily, our Bulk SMS API scales to meet your requirements. No more worrying about upgrading servers or dealing with complex infrastructure—KAPSYSTEM takes care of it.
DLT Compliance Built In: Headers and templates are registered on the operator DLT platforms and mapped to your API account, so compliant messages are not blocked at the operator. The API solutions aren’t limited to a specific region. Direct operator connectivity across Airtel, Jio, Vi and BSNL ensures reliable delivery to every Indian network.
Real-Time Reporting: Tracking the performance of your SMS campaigns is crucial. With our real-time delivery reports and analytics, you can monitor when messages are delivered, how many failed, and much more. This data gives you valuable insights into campaign success, helping you refine your marketing strategies.
High-Level Security: Keeping your data safe is our top priority. We use secure protocols to protect both your information and your users’ data during transmission. From login credentials to message content, KAPSYSTEM employs stringent security measures to maintain privacy and compliance with industry standards.
Dedicated Customer Support: Technical hiccups can happen, and when they do, you need reliable support. Our dedicated customer support team is on standby to help you with any challenges or questions regarding our Bulk SMS API. From troubleshooting to advice on best practices, we’re here to guide you.

Send transactional, promotional and OTP messages from your own software over a documented HTTP API, with DLT templates and delivery reports.

Bulk SMS API for Transactional, Promotional and OTP Messaging

Whether it's transactional alerts, promotional campaigns, or two-way messaging, the API carries DLT headers and template variables, returns schedule IDs and delivery reports, and integrates with any backend that can make an HTTP request.

Key Features of KAPSYSTEM’s Bulk SMS API

Explore the advanced capabilities of our Bulk SMS API designed to streamline your communication needs:

Bulk SMS API for businesses in India - KAPSYSTEM

Flexible Configuration

Our API allows you to customize sender IDs, message templates, and delivery options based on specific campaign needs.
This flexibility ensures your brand voice is consistent across all touchpoints.

Personalized Messaging

Gone are the days of generic bulk messages. With our Bulk SMS API, you can personalize each text using dynamic fields like name, location, or order details.
Tailored messages can dramatically increase engagement rates and conversions.

Message Scheduling

Want to send a campaign during peak hours or right before a sale starts? You can schedule messages to go out at the perfect time.
This feature also helps in setting up automated reminders for billing, appointments, or service updates.

Unicode Support

If your audience speaks multiple languages, our Unicode support ensures that messages are displayed correctly in any script, from Hindi, Tamil, Telugu and Marathi to English.
This helps your brand connect with regional audiences across India.

Two-Way Messaging

In addition to sending bulk messages, you can opt for two-way messaging solutions to foster interactive communication.
This can be especially useful for surveys, user feedback, or quick support queries.

What the Bulk SMS API Does for Your Application

A Bulk SMS API (Application Programming Interface) is a set of tools and protocols that allow your software to interact with our SMS platform. It enables businesses to send text messages in large volumes—often to thousands or even millions of contacts—with just a few lines of code. This streamlined approach saves time, reduces manual effort, and ensures greater reliability when you need to send critical updates, promotional campaigns, or important alerts.

Getting Started with KAPSYSTEM's Bulk SMS API

Four steps from business verification to production traffic with KAPSYSTEM’s Bulk SMS API:

Business KYC and DLT

Share entity documents for KYC and register your header and templates on DLT. Once you’re registered, you’ll receive API credentials that identify your business and authenticate every request.

Review the Documentation

Our detailed API documentation covers everything you need to know—from request structures and endpoints to best practices for handling errors. This makes it easy for both novice and experienced developers to get started quickly.

Perform Test Runs

Before going live, run a few test messages to ensure smooth integration. Use our sandbox environment or send a test SMS to your own phone to verify that everything works as expected.

Go Live

Once you’re confident in your setup, switch to the live environment. Your software can now send production traffic on your provisioned routes.

Monitor and Optimize

Keep an eye on the real-time analytics dashboard for delivery reports and click-through rates. Use this data to refine your campaigns, improve message content, or schedule sends at the optimal time.

Bulk SMS API Integration Use Cases

OTP and login verification

Trigger one-time passwords from your app or backend on the transactional route with a DLT OTP template. OTP SMS service

Order, shipping and payment alerts

Send confirmations, dispatch updates and payment receipts with template variables filled from your order system. Transactional SMS

Banking and NBFC notifications

Transaction alerts, EMI reminders and account updates from core banking or loan management software.

Appointment and booking reminders

Scheduled reminders for clinics, service centres and institutions, with delivery reports for audit.

CRM and ERP campaigns

Promotional campaigns to opted-in customers from your CRM with DND scrubbing and approved templates. Promotional SMS

High-volume broadcasts

XML POST API for large batches with per-message IDs and delivery-report flags for enterprise dispatch systems.

Who Can Integrate the KAPSYSTEM Bulk SMS API

Registered businesses and developers building applications for them. API credentials are issued after business KYC and DLT header and template registration; a test login is provided for integration. The API is not available for personal or anonymous messaging.

Bulk SMS API in India: Frequently Asked Questions

The quick start above shows the request structure, parameters and return values. The full specification with the API host, sample code and a sandbox login is shared after business KYC and DLT registration. Request API access and our team sends the credentials.

Yes. Templated requests carry your DLT-registered header (senderid) and the approved template ID (tempid); template variables are passed as F1, F2, F3 and so on in the order of the {#var#} placeholders.

Every accepted message returns a schedule ID. Call the delivery report endpoint with one or more schedule IDs to fetch status, or set the dlr flag in the XML API. Reports are also available in the web panel.

Yes. OTP and transactional messages use the templated endpoint on the transactional route; promotional campaigns use the plain-text endpoint on the promotional route. Your account is provisioned for the routes you need.

A test login is provided with your credentials after KYC so your developers can verify template variables, delivery reports and error handling before production traffic.

Standard GSM text and Unicode messages, so Hindi, Tamil, Telugu and other Indian languages are supported. Long messages are split into parts automatically. Up to 300 numbers can be sent in one request.

API access is included with business plans; you pay per SMS by route and volume slab with GST invoicing. See the bulk SMS pricing page or contact sales for priority and OTP route rates.

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