Verify API: Two-factor authentication made easy.

Add reliable security to your systems through messaging or voice channels. Use a single API to reach users across all devices.
Verify API: _Two-factor authentication made easy._ image

Verification Channels


Send 2FA codes via SMS with scalability across all devices and global locations.


Send your 2FA code via voice using text to speech, in localized languages.

Flash Call

Automatic interception of 2FA codes when customers accept an incoming call.


Conveniently deliver a 2FA code through WhatsApp.

Allow users to verify their identity with just their phone.

  • No need for users to download and configure a separate app, or remember an additional password.
  • Send scalable two factor authentication codes via SMS across all devices and global locations.
  • Our easy-to-navigate API automatically generates and delivers codes when requested by users at login.

Build Verify on top of RCS and VSMS for rich user experiences.

Pair account verification with Telnyx messaging and voice capabilities like Google RCS Business chat, V-SMS or Branded Calling, to make 2FA delivery a branded, interactive experience.

Users will feel secure knowing their two factor authentication code is coming from a credible source through a verified logo.

Easy setup in two simple steps:

Verify allows you to deliver two factor authentication code to any mobile number.

Step 1 - Create a 2FA profile that contains the configurations for sending out two factor authentication codes.

Step 2 - Create a 2FA verification using the 2FA profile ID and the end user’s phone number.

Maximum security at your fingertips.

  • Reliable Authentication

    Reliable messaging for scalable delivery and 99.999% uptime on our private network.

  • Analytics

    Client based DLRs give detailed insight into how customers interact with your messages.

  • Verified Sender IDs

    Send from short codes or use custom alphanumeric sender IDs for instant recognition.


What will you build with Verify?

  • Device Authentication

    Validate customers’ identities with a single-use, time-expiring authentication code to reduce fraudulent action.
    Learn More

How will you use Verify for Enhanced Security?

Choose Telnyx to power your 2FA.

The Telnyx SMS API comes with powerful features like number pooling, sticky sender, and message queuing to ensure highest deliverability.

With robust developer documentation and SDKs, we make it easier to navigate our APIs with minimal resources and help you get to market faster.

  • See our Verify API Pricing

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

    Starting at $0.04/API Call.

    See Pricing

Ready to get started?

Questions on setup? Talk to our experts

Frequently Asked Questions

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 your identity some other way to gain access. A common 2FA method is to send a time expiring one time password, sent to a mobile device via SMS in addition to username and password.

A two factor authentication code, or otherwise referred to as OTP (one time password), is a secondary means of authentication required to get access to a user account. This is sent as a message to the number saved on the account, after the user logs in with their email and password.

You will first need to create a 2FA profile that you will use to send your 2FA codes and where you will receive your responses. Secondly, to send the 2FA code, you need to input the phone number that will receive the message. Finally, the user will send the code they receive on their device back and if it matches the code that your profile sent out, the verification was successful and the customer has access to their account.

The Verify component of the Mission Control Portal is currently in development but will be live mid October. Once live, you will be able to create a Verify profile and a verification code within the section of the portal.

You can access the API in our Mission Control Portal and follow the simple steps under the Verify section. Alternatively, you can follow the developer docs to start sending 2FA codes via our API implementation.

You can check out our Verify developer docs.

Most of our users implement two-factor authentication to improve the security on their customers’ accounts. 2FA helps achieve this goal by requiring users to provide another method of identity validation in addition to username and password.

Verify charges per authentication. The cost of sending an OTP (One-Time password) is $0.04 / API call. Check out our pricing page for more information.

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