Rain at $1.95B valuation on $3B annualized volume with 38x YoY payment growth, and Crossmint just did an identical integration with Wirex weeks ago. They're speed-running the Plaid-of-stablecoin-to-fiat play: one SDK for wallets, card issuance, and RUSD collateral management across multiple card networks. Stablecoin-backed credit lines hit a different regulatory bucket than prepaid debit — more complex compliance surface, but way stickier for developers embedding financial products without touching a bank.

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