Prelude

Verification codes that don't arrive, spam filters blocking legitimate messages, and skyrocketing SMS costs — these are the headaches that slow down user onboarding and destroy conversion rates. Prelude is an OTP and SMS verification API platform built for developers who won't settle for anything less than reliable. It delivers phone verification to anywhere in the world with the best prices, top-tier deliverability, and zero spam. With AI-powered routing across 30+ carriers, built-in anti-spam features, and a developer-first API, Prelude helps you improve onboarding KPIs, lower verification costs, increase user verification success, and block fraud — all without fighting with carrier limitations.