Leading OTP SMS Platform for Businesses | Exotel

Use case

Reliable OTP SMS Service

Implement two-factor authentication with SMS.




Trusted By

cloud telephony - south east asia - exotel
cloud communications

Asha Satapathy

Exotel’s SMS delivery rate is quick. We have observed an improvement in our customer experience after using Exotel.

Founder & CEO, DocEngage

Raju Pardeshi

We’ve been using Exotel since BookRyde’s first baby step. It has really helped us implement and run SMS solutions seamlessly.

Founder & CEO, BookRyde

Apurv Jain

Exotel helps us in the entire packaging of the SMS reminders channel, thereby leaving the user delighted, satisfied, and retained with Haptik.

Product Manager, Haptik

Praveen Chandran

Our level of efficiency has drastically increased ever since we’ve started using Exotel. It’s increased by at least 3X.

Product Head, Quikr Services, Quikr


What is an OTP SMS?

OTP SMS or one-time password SMS is used for authentication. The OTP is usually a randomly generated number or an alphanumeric code that is entered into your website or app to verify portal logins, payment confirmations, or service requests for your business. This is part of a mandatory two-factor authentication process to protect your customers’ interactions with businesses.

Why Exotel?

Industry-standard delivery & engagement rates

Our intelligent SMS routes ensure that your business messages get delivered every time, on-time, for instant communication.


TRAI & DLT scrubbing compliance

We’ve made it extremely easy to comply with TRAI guidelines and DLT template scrubbing with resources to help you every step of the way.

Unbeatable prices

We offer the best prices in the market. Show us lower rates and we will match them.

Real-time reports

Know performance levels of your OTP SMS campaigns through metrics like delivery, open and click rates.

Highly flexible

Working on the REST format, our OTP SMS APIs are programmable to work with your enterprise tech stack. 

Simple to implement & use

Our platform’s user-friendly and straightforward interface allows you to set up an SMS campaign in 5 minutes.

Best-in-class security protocols

Our platform is secured end-to-end through robust practices. That means your customer data is completely safe with us.

Unbeatable platform uptimes 

We guarantee best-in-class platform uptimes of 99.94% – this includes operator uptimes

How can businesses use SMS OTP?


To allow your customers secure access to websites like net banking or to allow delivery agents into secured communities, OTP SMS play a crucial role

Transaction Verification

Protect your customers from financial fraud by authenticating transactions of any value.


Safely allow your customers to gain access to portals they were kept out of due to unsuccessful password attempts or any email address or phone number changes.

Account reactivations

Win new business back from the right customers through a secure OTP verification step to restart their services with you.

Shifting away from password logins

Offer a faster, yet safe login experience by considering skipping passwords for OTPs as a real-time authentication process.

How does OTP SMS service work?



Verification request by the customer

Customer clicks on the ‘Verify’ button on your app or website and a unique OTP is generated in your backend system.


Exotel verification

Exotel fetches the generated OTP and sends it to your customer’s registered mobile number through an SMS.


Customer’s number is verified

Your customer enters the unique OTP (sent to him/her via an SMS) in your app or website and gets verified instantly.

Benefits of using OTP SMS


Assured, rapid, 24×7 delivery

With dedicated SMS routes for OTP SMS, messages are not interrupted by any peak in SMS traffic. And an SMS is usually delivered in a few seconds.



An OTP SMS service offers one of the highest cost-benefit ratios when it comes to a reliable, fast, and accurate authentication channel.


Prevent spam

Create a security filter with OTP verification to prevent fake web form or product sign-ups so you only the right requests reach the right teams.


Easy software integrations

Set up campaigns with easy-to-use OTP SMS APIs that connect the SMS software with your enterprise software like an ERP.


Personalise formats

Popular vendors offer easy-to-configure OTP SMS APIs to set up any of the use cases listed here.


Track performance

Gauge deliverability and open rates by pulling reports from the dashboard. Test different strategies to improve results.

How customers use our SMS Solutions

Automated SMS reminders contributed to 40% of Haptik’s customer retention results

Read More

How Exotel helped Practo revolutionise the way people connect with doctors

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99dotco improved lead attribution by 20% by sending SMS alerts for missed customer calls

Read More


What is an OTP SMS?

It is a text message containing a randomly generated numeric or alphanumeric code for a business to validate the identity of its user trying to access its website, application or online platform.


Contact Us

How to enable SMS OTP Verification?

Gather your use cases that require added authentication and embed an OTP service provider's API into your enterprise systems. Send SMSes when certain conditions are triggered.


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or - Start your 15 day free trial

How to send an OTP SMS?

You can send OTP SMSes to your customers by using a dedicated OTP service provider's API which connects with your systems. Once set up, SMS are sent automatically when certain triggers are met.


Learn More

What is an OTP SMS service?

An OTP SMS service is any entity offering an easy, intuitive and ready-to-use platform to send OTP SMS to your customers. The OTP service should have server redundancies and be able to scale rapidly without compromising on service quality.


Try it out for free!


Try Exotel’s OTP SMS Solution Free for 15 days



Exhaustive guide on 2 factor authentication

From SMS OTP, to OTP over call, to email OTP, to no OTP at all! We show how 2FA evolved over time.

Find out how Exotel can work for you. Set up a call.

We take away some of the biggest pain points of traditional systems like EPABX.


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