Verify API

Create your own authentication program or build one into your existing product. Use a single phone verification API to reach users across all devices with OTP and more.

Get started in the portal.

Man receives 2FA code on mobile device

A two-factor authentication solution at a great price

Telnyx’s Verify API offers all the standard features of user authentication software, including OTP sent via SMS and voice as well as flash calling. It's super easy to use and, just like the rest of our platform, comes at a great price.


Simple two-factor authentication API

The Telnyx Verify API allows you to build your own authentication program using one easy API for SMS, voice and even flash calling.

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    Reliable authentication

    Reliable infrastructure for scalable 2FA delivery to your users in over 190 country codes.

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    Client based DLRs give detailed insight into how customers interact with your two-factor authentication tools.

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    Flash call

    Our API allows automatic interception of 2FA codes when customers accept an incoming flash call.


Developer-friendly, scalable API

Among CPaaS providers, Telnyx consistently wins awards for its results and ease-of-use. We take care of the details as you scale, so you don’t have to.


Ranked CPaaS for Results and Ease of Use

A global 2FA solution

Our Verify API can interact with your end users all around the world.


Country codes supported


Start verifying

Our code is your code.

curl -X POST \
  --header "Content-Type: application/json" \
  --header "Accept: application/json" \
  --header "Authorization: Bearer YOUR_API_KEY" \
  --data '{"name":"Test Profile","default_timeout_secs":300,"messaging_enabled":true}' \
  • Icon Resources Docs

    Build with an authentication API

    Configuration guides help you quickly add an authentication service to your app using SMS, Voice, Flash Call and/or WhatsApp.

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    Why 2FA?

    If you're worried about protecting your sensitive and personal information, learn how two-factor authentication can help.

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    What is two-factor authentication?

    We dive into how two-factor authentication works to add an extra layer of security, the different types of 2FA and more.

See our Verify API pricing

Customers typically save 30% by switching to Telnyx, with lower list pricing and automatic volume discounts.

Starting at:


per verification

2FA for multiple applications


Authentication is a means of verifying one’s identity, and two-factor authentication (2FA) is a method of establishing access to an online destination by requiring users to provide two different types of information. One common mode of single-factor authentication is the username/password pair. With 2FA, users need to both provide a password and prove their identity in some other way to gain access. A common 2FA method is to send a time-sensitive one-time password to a mobile device via SMS in addition to username and password.