Bet on Sports and NFL Season with the Leading Online Sportsbook that Accepts Bitcoins. Make Sportsbook your Home and Claim 20% Bonus on every. September 21, ➔ Find the Best USA Sports Betting Sites! Teasers, Parlays and season-long bets are all offered in addition to the main lines. USA betting. Parlay betting is one of the most popular forms of sports wagering. With parlays, bettors can bet that two or more point spreads, OVER/UNDERs, or moneylines.