Federal law requires casinos and card clubs to report currency transactions overR$10,000 conducted by, or on behalf of, one person, as well as multiple currency transactions that aggregate to overR$10,000 in a single day. These transactions are reported on a Currency Transaction Report by Casinos (CTRC) form.
Visa and Mastercard are the most universally accepted credit cards at betting sites, popular credit cards like Discover and American Express are accepted at multiple sportsbooks as well.