Stripe

Stripe dominates as the highest-valued US fintech unicorn at $65 billion, processing over $1 trillion in annual payment volume for 3 million+ merchants across 135 countries. Founded in 2010 by Irish brothers Patrick and John Collison, Stripe’s developer-first API cuts integration time to minutes—far faster than the average competitor’s multi-day setup. Its Atlas service has incorporated 50,000+ startups, expanding beyond payments into full financial infrastructure. By surpassing #2 Klarna’s $45 billion valuation by 44%, Stripe cements its lead as the platform of choice for global online commerce.