Verify users globally with a single API call
OTP via SMS, voice, or WhatsApp — with built-in fraud scoring and number intelligence to block fake accounts before they reach your funnel.
The challenge
- SMS pumping fraud exploits verification flows to inflate carrier traffic at your expense — fraudsters trigger thousands of OTP requests to premium-rate numbers, running up bills without a single real user.
- Disposable and VoIP numbers let bots bypass phone verification, flooding your platform with fake accounts that skew your metrics, abuse free tiers, and damage your sender reputation.
- Low OTP delivery in regions with poor carrier connectivity means real users get locked out at signup, driving abandonment and lost revenue before they ever activate.
How CloudVNO solves it
Fraud scoring before the OTP sends
CloudVNO scores every number for risk signals — carrier type, line activity, known fraud patterns — before dispatching a verification code. Block high-risk numbers instantly without adding friction for legitimate users.
Number intelligence to detect disposables
Our number intelligence layer classifies every phone number in real time: mobile, VoIP, landline, prepaid, or virtual. Reject disposable and VoIP numbers at the gate before a single OTP is sent.
Multi-channel delivery with smart fallback
Deliver OTPs via SMS, voice call, or WhatsApp. CloudVNO automatically falls back to voice if SMS fails, maximizing delivery rates in every region — so real users always get their code.
Products in this solution
Everything you need, integrated and billed together.
Verify
Global OTP delivery via SMS, voice, and WhatsApp with built-in retry logic and conversion analytics.
Number Intelligence
Real-time phone number lookup: carrier, line type, risk score, and porting history in a single API call.
Phone Numbers
Local sender numbers for OTP delivery improve open rates and reduce carrier filtering in key markets.
“CloudVNO's fraud scoring stopped 8,000 fake signups in our first month. The ROI was immediate.”
Get started in 5 minutes
Sign up free and start building with CloudVNO. No credit card required.