Fraud & risk
Block bad numbers before they cost you
Score every number for fraud and abuse risk at signup — disposable, VoIP, and recently-disconnected — before an account is ever created.
The problem
Fraudsters use disposable and VoIP numbers to spin up fake accounts, farm promos, and abuse OTP flows. By the time you notice, the damage and the SMS bill are done.
What changes with Qualmie
- Flag disposable and VoIP numbers at signup
- Score OTP-abuse and account-farming risk
- Send only risky signups to manual review
- Cut OTP spend on numbers that never convert
The APIs behind it
All products →Risk Signals
Is this number risky?
Score fraud and abuse risk from disposable, VoIP, and recently-disconnected signals — before a bad number costs you.
Line & Carrier
Who carries it, and what kind of line?
Resolve the current carrier, country, and line type — mobile, landline, VoIP or toll-free — including ported numbers.
Liveliness
Is this number active right now?
Confirm a number is well-formed, assigned, and live on a carrier network at request time — not just correctly formatted.