Yes, you can use Betfair in the USA.\n\n However, only in New Jersey Betfair is available.

Flutter Entertainment plc, formerly Paddy Power Betfair plc, is an international sports betting and gambling company. It is listed on the London Stock Exchange, and is a constituent of the FTSE 100 Index. It owns brands such as Betfair, FanDuel, Paddy Power, PokerStars, Sky Betting & Gaming, and Sportsbet.