Authenticate and verify your users using SMS OTP and Voice OTP services

What is OTP service?

OTP service is the easiest way of verifying user information and authenticating online transactions. Used by businesses to boost data security and prevent phishing attacks, an OTP service provider ensures timely delivery of OTPs to the right customers via SMSes and voice calls.

How OTP service works

Verification request

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 (This can be done either through SMSes or voice calls)

Number is verified

Your customer enters the unique OTP sent by Exotel on your app or website and gets verified instantly

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How enterprises benefit from Exotel’s OTP solutions

A glimpse at how Go-Jek used Exotel’s OTP verification solution to push their delivery rates to 92%

The Exotel Advantage
Why Exotel is considered as the most reliable enterprise cloud communications company in India and Southeast Asia


Superior Quality

Best success rates, voice quality and reduced latency


Scale at Ease

Grow at will, expand without worrying about infrastructure


Superior Reliability

Best in class uptimes of 99.94% including operator uptimes


Best Support

24×7 customer support via phone, email and Twitter


Simple to implement

Sign up and get started in less than 30 minutes, integrate easily using our REST APIs


Extensive Reporting

Easy to understand, detailed reports sent every day

Types of OTP services

SMS OTP Service

Send OTPs to your customers using SMSes. Exotel provides reliable OTP SMS services with high deliverability and low latency.

Voice OTP Service

Verify your customers using voice OTP service. Make automated voice calls and play a sequence of digits to verify the registered mobile numbers.

Advantages of Using OTP Services


Exotel is an OTP service provider that grows with you. Pay as you scale and never overspend on your resources.

No Delay

Don’t keep a customer waiting for any more than 8 seconds. Our OTP service ensures timely delivery of the OTP messages.

Operational Efficiency

Send thousands of OTP verification messages without having to run multiple numbers. Our OTP service can handle them all!

How can businesses use OTP service

Two-factor authentication (2FA)

Implement an extra layer of security in your systems, without adding complexity to your customers.

Spam prevention

Effectively control spam registrations, and avoid fake signups. Optimize and secure your backend systems against spam.

Password Resets

Instead of sending codes or links via email, use the OTP service to verify users before password resets.

Passwordless logins

Do away with passwords as your customers can be verified using an OTP every time they log in to your system.

Account Reactivations

Reactivate a user account with a confirmed acceptance from them. Use OTP verification as a means of verifying identity.

Transaction Authentication

Keep all transactions safe and sound. Add an additional layer of security with OTP verification to ensure safe transactions.

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Customer Experiences That Speak Volumes

Crafting Connected Customer Conversations for Enterprises Globally

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