Prelude

Prelude is a trust and onboarding infrastructure platform that unifies device, network, and signup signals into a single onboarding decision, helping businesses verify real users and block fraud. It solves the problem of fake accounts, bots, and SMS pumping fraud while protecting conversion and cost efficiency. The platform targets operations, IT, and executive roles in B2B companies, from startups to enterprises. It is delivered as a SaaS API with a suite of products including OTP verification, pre-KYC risk scoring, authentication, number intelligence, and transactional messaging.

Key features

• OTP verification across SMS, WhatsApp, RCS, Voice, Email
• Pre-KYC risk scoring to block fake signups
• Full authentication stack with persistent trust
• Number intelligence: reachability, line type, portability
• Reliable transactional messaging
• SMS pumping protection
• Device binding and behavioral monitoring
• Risk-based step-up authentication
• Smart routing and channel fallback
• Delivery insights and anomaly detection