Prelude Verify

Verify more users for less cost with our spam-free SMS API

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Prelude is the smartest way to build user verification into your app. Pay for verified users only with our anti-spam API and boost your conversion rate with our smart routing across 30+ carriers for cost-effective, reliable delivery. What makes Prelude unique? ✨ We created Prelude with founders and developers in mind, making sure it’s the product we wished we had in our previous role. Here’s how we stand out: 🥷 Anti-fraud focus: Many companies don’t realize how much of their SMS budget is lost to fraud (like SMS pumping or IRSF). Our AI-powered fraud prevention system evaluates each OTP in real time, filtering out fraudulent requests without blocking legitimate users, saving your budget. 🧠 Smart routing: Instead of relying on a single provider, Prelude acts as a smart broker, selecting from 30+ carriers and messaging channels to find the most cost-effective routes, ensuring you get the best conversion rate at the lowest cost. 📊 Real-time analytics & transparent pricing: Prelude shows exactly where your budget is going. With real-time analytics, you can track acquisition metrics and see the impact of your efforts in detail. We’ve also simplified common pain points: global registration means you can start sending OTPs immediately, we handle rate negotiations for you, and our 24/7 support ensures you’re never left in the dark.

Prelude Verify offers AI-powered OTP verification with smart routing across 30+ carriers to block fraud and lower costs.

for: Developers building user sign-up, login and authentication flows.
pricing: freemium

works withNode.jsGoPythonKotlin/JavaRuby

Key features

7 features of Prelude Verify

AI anti-fraud protection — Real-time evaluation of each OTP to filter fraudulent requests without blocking legit users.
Smart multi-carrier routing — Selects the most cost-effective route from 30+ carriers and channels for each message.
Multi-channel OTP delivery — Supports SMS, WhatsApp, RCS, Voice and Email in 230+ regions.
Real-time analytics dashboard — Shows acquisition metrics, delivery insights and transparent per-verification pricing.
Device & network signal scoring — Combines device, network and carrier signals to make a trust decision at every lifecycle stage.
Zero-cost testing options — Provides free test numbers or credits to try the service without charge.
Premium Slack support — Direct Slack connection to the team for fast onboarding assistance.

Use cases

Verify phone numbers for fintech onboarding while preventing SMS pumping fraud.
Reduce verification costs for consumer apps by routing OTPs through the cheapest channel.
Detect and block fake accounts in high-risk countries using real-time risk scoring.
Maintain trusted sessions with device binding and behavioral monitoring for login flows.
Win back inactive users with channel fallback and cost-optimized re-activation messages.