This point is rather important, because you can't go without transfers. Each reliable casino has a range of banking options, which include e-wallets, instant banking, credit/debit/prepaid cards, alternative payments, etc. You should check whether a method is available for depositing and withdrawing at the same time, how long transactions take, what currencies you can use and what fees are included. And, of course, look for the casino’s licenses which point out the legality of the system.