Most credit card betting sites are fully licensed to operate in the online gaming business. Such sites are also likely to be owned by well-known parent companies. Identifies which NFL online betting sites are legal for U.S. players and details why each is Is It Legal To Bet On NFL Games Online In The US? The Wire Act has no authority over the operators of overseas sportsbooks, however. occasionally will block credit card payments to online NFL gambling sites because banks. We have put together the best online sportsbooks that accept credit card deposits. Deposit a week before the game to get your started. Deposit early in the week if you are betting on football as online sportsbooks will have less volume on.