American odds are also known as lines or money line odds. If US Odds are indicated with a + sign then they show the amount you would win for a 100 stake. If there is a - sign then they show how much you need to stake to win 100.
Quote:
So if you are betting on an event which has decimal odds of 5, or fractional odds of 4/1, the US Odds would be +400. If you are betting at decimal odds of 1.5, or fractional odds of ½, then the US odds would be -200US odds can be divided into positive odds and negative odds.
Negative US odds show how big a stake is needed for a winning of 100 units. Positive odds show how big your winnings are if you bet 100 units.
In your example:
+$108 = You bet $100 to win $108
-$108 = You bet $108 to win $100