Verification API for the United States

Phone Verification for US Users

Phone verification is a critical step in many applications to ensure users are real and to prevent fraud. Our Verification API provides developers with the tools to verify US phone numbers through SMS-based challenges. Whether you're building a social platform, a financial app, or an e-commerce site, integrating phone verification can enhance security and trust.

The Verification API goes beyond simple OTP delivery by offering a complete verification workflow: you can initiate a verification request, send a code via SMS, and then validate the code entered by the user. This end-to-end process is managed through a clean REST API.

How the Verification API Works

The verification process typically involves these steps:

1. Initiate Verification: Your application sends a request to the API with the user's US phone number. The API generates a unique verification code and sends it via SMS.
2. User Enters Code: The user receives the SMS and enters the code into your app.
3. Validate Code: Your application sends the code back to the API for validation. The API checks if the code is correct and if the verification session is still active.
4. Verification Result: The API returns a success or failure response. On success, you can mark the user's phone as verified.

This flow is secure and can be customized with parameters such as code length, expiration time, and retry limits.

Key Features

Our Verification API includes features designed for US-focused applications:

• Real-Time Validation: Validate codes instantly to provide immediate feedback to users.
• Customizable Code: Choose numeric or alphanumeric codes, and set the length.
• Expiration and Retry: Define how long codes are valid and how many attempts are allowed.
• Webhooks: Receive notifications when a verification is completed or fails.
• Analytics: Track verification success rates and monitor for suspicious activity.

These features help you build a robust verification system without managing SMS infrastructure.

Use Cases

Phone verification is used in various scenarios:

• User Onboarding: Verify new users' phone numbers to reduce fake accounts and spam.
• Two-Factor Authentication: Add an extra layer of security by requiring a code sent to the user's phone.
• Password Reset: Verify identity before allowing password resets.
• High-Value Transactions: Confirm transactions by verifying the user's phone number.
• Compliance: Meet regulatory requirements that mandate phone verification for certain services.

For US-based businesses, using a local verification API can improve delivery and reliability.

Integration and Workflow

Integrating the Verification API is straightforward. Here's a typical workflow:

1. Sign up and get your API key.
2. Send a POST request to /verifications with the phone number and parameters.
3. The API returns a verification ID and sends the SMS.
4. When the user submits the code, send a POST request to /verifications/{id}/check with the code.
5. Based on the response, proceed with your application logic.

We provide comprehensive documentation and code samples to help you integrate quickly.

Best Practices for Phone Verification

To maximize security and user experience, consider these best practices:

• Use Rate Limiting: Prevent abuse by limiting verification attempts per phone number and IP.
• Secure API Keys: Keep your API keys secret and rotate them regularly.
• Monitor Fraud: Watch for patterns like many verification requests from the same IP or to the same number.
• Comply with Regulations: Ensure your verification process complies with US laws, including TCPA and carrier guidelines.
• Provide Fallbacks: Offer alternative verification methods (e.g., email) in case SMS fails.

Following these practices helps you build a reliable and secure verification system.

Availability and Coverage

Our Verification API supports US phone numbers for sending verification codes. If you need to receive verification codes on US numbers for testing, availability may vary. We recommend checking current availability through the API or dashboard. We are continuously expanding our coverage to support more US numbers and features.

Conclusion

The Verification API for the United States provides a powerful way to verify phone numbers and authenticate users. With a simple REST interface, customizable features, and robust security, it's an ideal solution for developers building for US users. Check current availability and start integrating today.