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Rain is a full-stack fintech infrastructure platform that enables developers, fintechs, and financial services firms to embed stablecoin payments into their products through a unified API. The platform handles money-in, storage, spending, and money-out across multiple blockchains while managing complex back-end operations like tokenization, compliance, and settlement. Rain's proprietary settlement stack allows Visa card transactions to interoperate with stablecoins, making them practical for everyday purchases. The company pioneered the ability to settle Visa transactions using stablecoins seven days a week, reducing working capital requirements and enabling near-instant liquidity.