Up and Down orders are automatically mapped to the opposite side of the order book using the formula (1 − price), sharing liquidity: Up Ask 0.66 → auto-mapped to Down Bid 0.34 (= 1 − 0.66) Down Ask 0.38 → auto-mapped to Up Bid 0.62 (= 1 − 0.38) This means a sell order placed on the Up side simultaneously provides buy-side liquidity for the Down side, significantly deepening market liquidity. Example: A user places a sell order for 200 Up shares at 0.70 USDT.