Official betting is when a sportsbook offers markets on a game that are generated by official data and oddsmakers. These markets often offer more accurate pricing and are typically higher-frequency than the unofficial markets. They are a good way for sportsbooks to increase their market share in states where legal betting is available and can give fans a more authentic experience.

NFL: The NFL doesn’t explicitly forbid gambling, but its rules do prohibit team and player personnel from placing bets on NFL games. They are also prohibited from entering sportsbooks during the season, sharing non-public information with bettors and maintaining social, business or personal relationships with them. In addition, they must sign a statement acknowledging the league’s gambling policy before being hired.

MLB: MLB’s Rule 21 bars anyone associated with a team from betting on a game that doesn’t involve their team. It’s a strict rule that can lead to fines, suspensions and even permanent bans — like the one that Pete Rose faced after making illegal bets on his own games.

NHL: The National Hockey League has no official position on legal sports betting, but it does have partnerships with technology companies and bookmakers that include in-game data and access to real-time statistics. The league’s Vegas Golden Knights are the first expansion franchise to open an arena in a state with legal sports wagering and Edmonton Oilers star Connor McDavid has appeared in ads for BetGM alongside hockey legend Wayne Gretzky.