Sports betting is now legal in 24 states and the District of Columbia, with DraftKings and FanDuel being the NFL’s official betting partners. However, it is important to remember that betting on collegiate games and events (including player props) is against NCAA rules.

In order to be considered an official bet, a wager must be placed before the start of play. The odds must be available at the time of placing the bet, and all wagers must be made through an authorized bookmaker.

While it is a common misconception that the only way to bet legally is to do so through an offshore site, this is not the case. In fact, some reputable sportsbooks actually offer their customers the ability to place wagers from any location in the world, provided that it is legal to do so.

Unlike Nevada, which requires operators to use official data to grade sports betting lines, most US states have no such mandate in their laws. A law in Tennessee, for instance, only requires that sportsbooks use official league data on Tier 2 bets, which involve the final score or outcome of a sporting event and are placed after the game has started.

Ultimately, it will be up to operators and their bettors to decide whether or not they are willing to pay for official data. The cost of this data currently appears to be commercially reasonable based on what the leagues are asking via distributor Sportradar, but the value will be tested as the market continues to evolve in the years to come.