Common payment methods for purchasing sweeps coins at sweepstakes casinos include credit and debit cards, such as Visa and MasterCard, and sometimes American Express. Many platforms also accept e-wallets like PayPal or Skrill and direct bank transfers. Some casinos have started integrating cryptocurrencies like Bitcoin for purchasing purposes. It’s crucial to check your chosen platform’s specific options, as they can vary. Additionally, ensure that the payment method you select is secure and that you’re aware of any associated fees or processing times.