Stark Bank
Brazilian business payment institution with corporate Mastercard and separate crypto treasury trading

Brazilian business financial platform and Banco Central-authorized payment institution. Stark Bank offers a corporate Mastercard plus a separate workspace product for companies to buy and sell BTC, USDT, and USDC from available BRL balances. The reviewed card materials describe a conventional credit-limit and invoice product, not direct crypto authorization, so the directory keeps card funding separate from treasury crypto trading.