Hi-Lo paytable
Higher or lower on a single card. Each right call multiplies the stake at the true odds less 2%, and you can bank the streak whenever you like.
How it pays
One card from a shuffled 52-card deck; call the next one higher or lower (aces count low, a tie loses). Every correct call multiplies the stake by 0.98 over the true probability, and the streak can be banked at any point.