Polymarket widens fees to most markets on March 30

Polymarket will expand trading fees across most event markets on March 30, extending charges beyond crypto and sports to politics, finance, economics, culture, weather and tech. Under the updated schedule, the highest peak rate applies to crypto at 1.8%, while sports will peak at 0.75%.

The platform uses a sliding fee model tied to market probabilities. Fees are highest when a contract is priced near 50% likelihood and taper to zero as outcomes become more certain. Crypto markets will rise from a 1.56% peak to 1.8% at the midpoint. Sports will increase from 0.44% to 0.75%. Most other categories will peak between 1% and 1.56%. At 50% probability, a $50 sports trade will incur a $0.38 fee, up from $0.22 under the current schedule.

Alongside the fee expansion, Polymarket introduced a referral program for users with at least $10,000 in prior trading volume. Referrers earn 30% of fees from direct referrals and 10% from indirect referrals for the first 180 days after each signup. Rewards are uncapped and credited daily at midnight UTC.

Polymarket also updated market integrity rules across its international platform and its CFTC-regulated U.S. venue. The rules bar trading on stolen confidential information or illegal tips and limit participation by individuals who can influence event outcomes. Users can report suspicious activity through new Market Integrity pages.

The update brings fees to most categories for the first time, with crypto set at the highest peak rate and sports remaining the lowest. The fee structure remains based on market probabilities rather than fixed commissions.