Polymarket, a leading prediction market platform, has transitioned from an Automated Market Maker (AMM) model to a Central Limit Order Book (CLOB) model to address liquidity challenges. The shift, which occurred in late 2022, allows traders to set prices and market makers to profit from bid-ask spreads, improving the trading environment. The CLOB model facilitates higher liquidity by enabling large trades without significant price changes, a common issue under the AMM model. To further enhance liquidity, Polymarket introduced a reward system to incentivize liquidity provision. While political markets on the platform typically enjoy high liquidity, mention markets often experience lower liquidity levels.