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


Resetting password

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


Passwordless logins & authentication

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


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.


Let us help you get started 


You can try nOTP yourself 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.

    nOTPTM advantage for your business

    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


    Annual savings on verifications

    Disclaimer: The cost for an SMS OTP is $0.21

    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.

    Asia’s most innovative companies use Exotel

    Chirag Patel

    Exotel's API documentation and implementation process is extremely simple and easy to follow. There were no hassles in setting it up. We use other cloud telephony platforms as well but Exotel gets a big thumbs-up from us for their ease of use.

    Engineering Manager, 1mg

    Shashank ND

    We have worked across cloud telephony players and with other vendors, but the fact is Exotel is dependable.

    Co-Founder & CEO, Practo

    Prateek Jain

    The number masking feature has been a very worthy addition to making our customer experience even better.

    Former Associate Director - Driver Experience, Olacabs


    Exotel's automated calls have helped in increasing our service levels and reducing our costs since there is no need for any manual intervention.

    Senior Manager - Operations and Strategy

    Praveen Kumar

    Exotel's APIs are very clearly defined. Our tech team could integrate them in no time. It’s easy to incorporate into any product.

    Assistant Vice President, Quikr Services

    Satish Chugh

    Very supportive and understanding staff who have lived up to every expectation, and at times exceeded them too.

    Senior Manager- Last Mile Design, Ekart


    Get Early Access for nOTPTM

    We’ll notify you as soon as we launch it

    The Exotel Advantage

    Why Exotel is considered as the most reliable 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

    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.