Most credit cards won't work, they deny the charges b/c it is online gambling. Debit cards do work though...which leads me to ask, what about using GC's? The risk here is with all the gambling sites being shut down randomly and sued by the US government...do you want to risk a large amount being sent there and then tied up? On top of that, i'm pretty sure once you make a few deposits and don't gamble, they will catch on.