Get a Free WhatsApp Business Account – Includes Onboarding, API Access & Sandbox. Apply Now!

Transactional
SMS Service

Send automated messages through transactional SMS API for instant alert, appointment, banking, and OTP messaging.
sms Transactional

Automate transactional SMS at every event

Transactional SMS service let you send critical OTP, notifications & updates to your users worldwide.You can strengthen business relationships by bringing on engaging text message experiences at every event.

The Transactional SMS API allows you to send text messages globally.

Alerts and notificationsAppointmentsBilling and paymentsBusiness communications
Banking SMSCustomer campaignsOrder ConfirmationsStaff rostering

What do you get with a transactional SMS route?

Number type DND and Non DND AllowedTransactional SMS are deliverable
on both DND and Non DND numbers.
Developer API API Document availableAPI available in multiple programming
languages with document support.
Sender ID6 Alpha Character SenderTransactional SMS delivers with sender
ID like DOMINO, Airtel, etc.
SMS GatewayTransactional Routes are regular for
24x7. No time band.		Transactional routes are faster as well as not timely
restricted. SMS will be delivered at every action of the event.
Set up costPay as you Go.No hidden charges, No setup charge. No API integration
charge, Just Pay for what you send.

Send time based messages with Transactional SMS API

Utilize our REST API to send transactional SMS. Integration is simple and seamless, so you can focus on delivering a top-notch user experience while keeping your platform secure.

Business: Alert and Notification

Send transactional SMS for alerts, appointment, remainder, event notification, bank update, payment confirmations and more through simple REST API integration.


Make your CRM capable of sending SMS messages by integrating authkey’s API. Your customers can receive timely updates and helpful reminders by using SMS APIs.

Secure Messaging: OTP and 2FA

Experience lightning-fast delivery of One-Time Passwords (OTP) with unparalleled security measures in place. Our API enables you to send SMS OTPs to verify and prevent fraudulent logins.

Protect your web application or mobile app with our 2FA APIs that can be easily configured to meet your needs. Our SMS API offers two-factor authentication through both voice and text messaging, providing an added layer of security.

Features

What makes Authkey a trusted Transactional Bulk SMS service provider? Use Transactional messaging API and its programmable features to enable automated sending through integrated software, CRM or application for business workflow.

Illustration
Free API Integration

Integrate API into your application to automate sending messages on action of event occurrence. Developers can integrate SMS API into applications to enable SMS functionality and communication with users.

Illustration
Failover solution

Failover solution for the time based sending like OTP and 2FA secure code. Fallback algorithms utilise the SMS, Voice and Emails channels simultaneously. If text OTP failed, automated voice delivery with TTS.

Illustration
Send-Get Reports

Get instant delivery, latency and failed reports with error code that makes it easy to resolve scenarios. You can also get delivery reports on your application by report API/webhooks.

Illustration
Desired Templates

Send SMS with a business name registered sender ID. Pre-approved templates available for OTP and business use cases. Template design assistance with an experienced team.

Illustration
24x7 Uptime service

You can send or automate transactional SMS at any time. There is no government restriction, can be sent and be available to your customers 24x7.

Illustration
DND Allowed

Send messages to DND and Non DND numbers with transactional SMS service. This route is most useful for OTPs and important notifications, alerts, payment confirmations that aren't promotional.

Feature-rich Transactional SMS API for Developers

Automatically send bulk SMS from any website, CRM, or software. You can rely on our robust routing engine to ensure your messages are delivered at the time they are expected, regardless of the technical conditions. Transactional SMS API available in multi programming languages like PHP, Python, JAVA, C#, cURL, Powershell, Node.js, Go, Javascript, Ruby and Swift. Start with an SMS API in minutes.

Check out Sample Codes for SMS API

Use sms verification api for Cash on Delivery Order Confirmation. The robust multichannel high volume API build to trigger OTPs & verifications.


<?php
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => "https://api.authkey.io/request?authkey=AUTHKEY&
mobile=RecepientMobile&country_code=CountryCode
&sms=Hello%2C%20your%20OTP%20is%201234&sender=SENDERID",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",

}
  • Multichannel transactional API can send SMS, voice and email simultaneously.
  • Trusted by more than 10k developers for its functionality, security and scalability.
  • No cost for API integration. It's free. Only pay for the message credit you do.
  • Check your real time report analytics and webhook API, delivery report(error code also if failed), contact management, schedule messages, balance info and more in the dashboard.
  • A right team for the right use case like API integration, template approval, customer support and more.

Check out Sample Codes for SMS API

Use sms verification api for Cash on Delivery Order Confirmation. The robust multichannel high volume API build to trigger OTPs & verifications.

See DecumentionTry for free

Why Choose Authkey ?

We Scale with you

Regardless of one or million messages you send, our SMS infrastructure will ensure you that they deliver on time.

Pay as you Go

Utilization based pricing enables you to get discounted pricing from the beginning while only paying for what you use.

Enterprise-grade

We connect your messaging flow directly over 220+ carriers in 200+ countries for international delivery that is best in class.

Compliance & developers

We align you with the support and developer team. We ensure that your Authkey.io experience is smooth and successful.

Frequently Asked Questions

Frequently Asked Questions