Our house edge is 1.9%. This is something that we earn on every bet.
This percentage is "built-in" into payouts. It means that without it, if you made an "over 11" bet (or "under 3") you'd get a 36X payout, since the probability for such bet would be 1\36. And since we take 1.9% from this payout it is 35.3X instead of 36X.