Odds boards in a Las Vegas sportsbook. Sports betting is the activity of predicting sports results and placing a wager on the outcome. The frequency of sports bet upon varies by culture, with the vast majority of bets being placed on association football, American football, The spread, or line, is a number assigned by the bookmakers which. Bet on Sports and NFL Season with the Leading Online Sportsbook that Accepts Bitcoins. Make Sportsbook your Home and Claim 20% Bonus on every. NFL Vegas Odds, Betting Lines, and Point Spreads provided by VegasInsider. com, along with more pro football information for your sports gaming and betting.