My credit card worked recently on small deposits at Ultimate Bet, Absolute Poker, and Reefer Poker, so I am sure it is not too hard of a thing to do.
Sportsbook used to be my favorite site with their daily $500 freerolls
that paid a lot of positions. Won over $100 on their freerolls anf had lots of gold cards. I played them before they changed networks. Since they went over to the same network as Rio, Reefer, Feltstars, 365 Bonitas, etc, they are back to the bottom of my list and have to reprove themselves all over again. I have almost $300 in my Reefer account, so until I blow through that bankroll or cash it in, it might be awhile until I get back to doing something with my $100 in sportsbook.