Official betting is a new product available at most US sportsbooks. It is a dynamic wagering type, so be sure to check the terms and conditions before you make any bets.

Money lines (odds) change constantly, as do the odds on spread bets. This can mean the favorite is winning by a huge margin, or the underdog seems about to pull off an upset.

Totals: The total runs scored in a game is called the over/under, and games must go at least nine innings for action on this wager. This is the most popular wager in the US market, with most sportsbooks offering them at a competitive price.

Dime Lines: Many books offer dime lines, which are small money lines that fluctuate depending on the number of teams and outcomes during a game. These are often used in baseball, but they can be found in other sports as well.

Bettors can cash out their bets before the outcome is official, if they want to place a larger stake. This can be a good idea for some spread bets, but not all.

Rules for official betting

The terms and conditions of your bet will determine how much you can lose. The betting site will show you the odds and the return percentage that is expected for each result.

The terms and conditions of your bet will also state how much you can win if your bet wins. The betting site will provide a calculator to help you figure out the probability of each outcome.