Fraud & Security

Verify user legitimacy at sign-up. Stop VOIP abuse, bot-driven registrations, and SMS fraud before they hit your database.

Block burner profiles

Filter out VOIP and virtual phone numbers at registration. Ensure every user provides a high-quality mobile handset.

Stop IRSF attacks

Avoid paying for fraudulent OTP requests to invalid or high-risk international numbers. Validate before sending.

Low-latency API

Run carrier checks in milliseconds. Our API integrates into your backend signup flow without adding friction.

$0.0064

starting per check

200+

countries covered

10 free

checks to start, no card needed

1 credit

per lookup, refunded if invalid or failed

The integration

Trigger validation

Send the user's phone number to our API endpoint during the registration or checkout process.

Receive live status

We return the line type, reachability status, and carrier data instantly. You make the decision to block or proceed.

Automate security

Route suspicious or invalid numbers away from your SMS trigger, keeping your costs low and your user base clean.

Protect your SMS billing from fraudulent traffic.

IRSF (International Revenue Share Fraud) attacks target systems that don't validate numbers before sending OTPs. Integrate Numtrue to check for unreachable, VOIP, or burner numbers in milliseconds. Only trigger expensive verification messages for legitimate mobile devices.

Also see: Disposable number checker to flag burner numbers before they cost you.

Get API access

API access unlocks with a Pro credit pack.