Polymarket made two major adjustments, providing a lot of information:

First: The range of fees charged has expanded, mainly aimed at increasing liquidity.

Starting from March 30, the taker fee was previously only applicable to the Crypto and Sports categories, but now Finance, Politics, Economics, Culture, and Weather have been added.

The new rates are not fixed; they are dynamically calculated, with peak values generally around 50% probability (meaning the most competitive positions). The maximum for the Crypto category is about 1.8%, while the other newly added categories are around 1%.

The collected fees are mainly used to incentivize market makers to place orders. Fees are calculated in USDC, deducted from shares when buying and from USDC when selling.

Second, user growth, the referral program (commission plan) has also been opened up.

Previously in beta testing, now all users with trading volumes exceeding $10,000 can participate.

The more new users trade, the more rewards they receive, calculated proportionally.