Product Auth


Verify Users, Without an OTP

nOTPTM is an innovative product that allows you to authenticate and verify users without any actions from their end. Available as an SDK currently for Android phones, it works much faster than the typical OTP verification. The beauty – It works without an SMS. Hence the name nOTP. Getit?

Time to Think Beyond OTPs

Two-Factor authentication

nOTP can help you add a layer of security to apps without adding complexity for your users

Passwordless Logins & Authentication

Users do not have to remember passwords and can simply be verified using nOTP every time they log in.

Resetting Password

Instead of sending codes via email or SMS, nOTP is a hassle-free way to verify users before password resets.

Prevention of Spam

Instant verification allows you to stop spam registrations and avoid fake users from signing on.

How It Works


Customer clicks the “verify” button on the app


Exotel Verification

Exotel makes an automated outbound call to the number specified in the app.

Intercept Call

Exotel SDK automatically intercepts the call, disconnects it and verifies the customer.

Number Verified

Exotel then pings the server that the number is verified.

Try It Yourself to Get Started

You can try nOTP yourself (android only) by filling this form. You will receive the test package over email. Alternatively, you can sign up and our agents will reach out to you and schedule a demo.

Time to Think Beyond OTPs

Device Specific Authentication

nOTP is built in a way to prevent cross-device authentication. Customers need to be using the same phone number on their device for authentication.

Seamless Experience

This method of verification requires no action from the user’s end, making it a seamless experience

Higher Success Rate

nOTP has a higher success rate compared to SMS verifications since there is no scope for delivery failures

Lower Cost

nOTP costs upto 50% less than traditional verification methods. Pay only for successful verifications

nOTPTM Savings Calculator

Cost for OTP
Cost for nOTP
Savings on verification's
Disclaimer: The cost for an SMS OTP is ₹0.21
Exhaustive guide on 2 factor authentication

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. We list down the various forms of 2FA solutions including a new way of authentication – nOTP

Asia’s most innovative companies use Exotel

Get Early Access for nOTPTM

We’ll notify you as soon as we launch it

The Exotel

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

  • ISO-Certified

    Highly Secure

    ISO 27001:2013 certified information security management system
  • Superior-Quality

    Superior Quality

    Best success rates, voice quality and reduced latency
  • Super-reliability

    Superior Reliability

    Best in class uptimes of 99.94% including operator uptimes
  • Patented-Use-cases

    Patented Solutions

    Gain competitive advantage from patented products
  • Scale-at-ease

    Scale at Ease

    Grow at will, expand without worrying about infrastructure
  • Best-Support

    Best Support

    18×7 customer support via phone, email and Twitter

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

We are India & SE Asia's leading cloud telephony & communications operator. Let us show you how!