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Verify API

Easily validate customers across the world at scale. Our patented 2FA technology helps you protect against fraud, build trust, and increase conversion across multiple channels—no telecom or security experience required. Plus, you’ll only pay for successful verifications.

Try it free
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You’re Invited! Get Early Access to Verify API 2.0

Sign up now for early access to our enhanced Verify API and start using our new WhatsApp authentication channel!

You’re Invited! Get Early Access to Verify API 2.0

Sign up now for early access to our enhanced Verify API and start using our new WhatsApp authentication channel!

Learn more

 

 

See how Verify helps businesses like yours succeed.

Prevent Fraud

Use up-to-date intelligence on phone numbers to detect potentially fraudulent transactions. The second step in 2-factor authentication easily minimizes fraud with an extra layer of security.

New Authentication Channels

We are adding new channels like WhatsApp for authentication, allowing you to authenticate your end-users where they prefer.

Scale Your Deployments Globally

Whether you have customers in one country or hundreds of countries around the world, Verify takes care of all the heavy lifting so you can focus on your business.

Customizable

Empower your clients to tailor the failover sequence to other channels, and generate and manage their own PINs.
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Only Pay for Successful Authentications

Efficiency and effectiveness matter. Only pay when your customers successfully verify their accounts.

Try it free

Start developing now with free credit. No credit card required.
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Authentication Channels

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SMS

Send one-time passwords (OTP) via the convenience of a text! Deliver SMS using approved sender IDs that are compliant with local rules and regulations.
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Voice

Text-to-speech (TTS) adds the personal touch of a human voice to your authentication workflow. Use TTS as a back-up when delivery of SMS is challenged.
WhatsApp Messages

WhatsApp

Now you can leverage WhatsApp to start the authentication process! Use this popular chat app as a failover method after SMS and/or Voice. Learn more
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ACCOUNT AUTHENTICATION

Acquire genuine customers anywhere in the world

Easily add a layer of protection by using a phone number to authenticate new and existing customers.
  • A single API offers a secure full two-factor authentication solution
  • Bring your own number! Or, we can provide numbers for your authentication flow. Works with any phone number—no additional hardware or apps required
  • We do the heavy lifting for you, including sender ID management, OTP generation, failover, and fraud monitoring

  • Ensure one-time passwords (OTP)  are delivered in accordance with country requirements

FRAUD DETECTION

Protect your business from scammers

Prevent expensive unauthorized transactions while delivering a better experience.
  • Trigger step-up authentication only for those numbers suspected of being fraudulent
  • Use up-to-date phone number intelligence to detect illegitimate transactions
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SPAM AND BOTNET PREVENTION

Eradicate unsolicited messages more effectively

Block botnets and bulk account creation via frictionless phone verification for mobile users.
  • Suppress spam
  • Minimize personal information sharing
  • Give every user a unique identifier via their phone
  • Confidently grow your application’s audience
Illustration depicting two-factor authentication; a cell phone shows a four digit-code, behind it a computer screen has a row of boxes for the code to be entered
PASSWORDLESS AUTHENTICATION

Provide convenience without compromise

Ensure safe access by delivering time-limited, single-use authorization codes with passwordless authentication.
  • Let users gain instant and secure access to your app with just their phone
  • Works with any type of phone line anywhere in the world—with a single API
  • Pay only when users successfully access your application
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7 Reasons Why You Should Consider a Two-Factor Authentication Solution Instead of Building Your Own
If 2FA is not at the core of what your business does, there is definitely an opportunity cost. See how Verify API can help!

Get smarter fail-safe, reliable delivery, and tailor-made messaging.

Global Text-to-Speech (TTS)

TTS in languages to ensure you reach clients all over the world.

Intelligent failover

Automatically resend PIN codes via voice (TTS) to customers through one API request—without additional code.

Adaptive Routing™

Optimize delivery by proactively re-routing messages around congestion.

Flexible implementation

Choose from three Verify models: Verify Success, Verify Request or Verify Conversion.

See how businesses like yours are using Vonage APIs today.

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Secure valuable video conversations with Verify API
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Speak with an expert.

US toll-free number: 1-844-365-9460
Outside the US: local numbers