Coinflip

House mode: call heads or tails. A correct call pays 1.98×.

Series mode: keep calling. After n correct calls the multiplier is 0.99 × 2ⁿ; cash out between flips or lose it on a wrong call. Ten flips maximum.

PvP mode: create a game with a side and a stake. An opponent takes the other side. The winner receives 1.98× the stake; 1% of the pot is the fee.