Rain vs Stark Bank
Side-by-side comparison of AI visibility scores, market position, and capabilities
B2B stablecoin payments infrastructure raised $250M Series C at $1.95B valuation in Jan 2026; $3B+ annualized transaction volume; 30x active card base growth YoY;
About
Rain is a B2B stablecoin payments infrastructure company that enables enterprises to issue, manage, and transact using stablecoins on global card networks. Founded in 2022, Rain raised $250 million in Series C financing in January 2026, achieving a $1.95 billion valuation — a 17x increase in just ten months — led by investors including Western Union Strategic Ventures.
São Paulo Brazil YC W20 open banking API at 155B BRL ($31B) payments 2023 with 3x YoY growth and doubled net income; $58.2M total ($45M Ribbit/Bezos Series B 2022) serving Gol/Localiza/QuintoAndar competing for Brazil fintech infrastructure.
About
Stark Bank is a São Paulo, Brazil-based open banking API platform and digital business bank — backed by Y Combinator (W20) with $58.2 million in total funding including a $45 million Series B in April 2022 led by Ribbit Capital with Lachy Groom and Bezos Expeditions (Jeff Bezos's personal investment vehicle) — providing companies with payment processing infrastructure, banking APIs, and financial services built on Brazil's open banking framework. In 2023, Stark Bank processed 155 billion reais ($31 billion USD) in payments (3x year-over-year growth), doubled net income to 71.5 million reais, and serves 600+ enterprise clients including Gol Airlines, Localiza, Ultragaz, Loft, and QuintoAndar. Founded in 2018 by Rafael Stark.
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