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Unfortunately Ukash is not available for US casino players.
Ukash is definitely one of the big players on the online payment processing market. "Use your voucher code to spend and send money online", it says on the Ukash website. This one sentence exactly tells you the core business of Ukash. You take your cash, buy a voucher at one of the points of sale, and type in the voucher code at the Ukash casino of your liking.