Fee
The platform's cut on a trade, withdrawal, or settlement. Eats into edge — calculate before sizing positions.
Deposit $10, Get a $25 Trading Bonus! on Polymarket with code COLLEGEPM
Trade on Polymarket → (opens in a new tab)18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
21+. Gambling problem? Call 1-800-GAMBLER.
Trade $50, Get $75! on ProphetX with code COLLEGEPM
Trade on ProphetX → (opens in a new tab)18+ only. New traders only. Offer terms are set by ProphetX and may change. Event contract trading involves risk, including loss of the funds you commit. ProphetX is a CFTC-regulated designated contract market and derivatives clearing organization. Not available in all states.
21+. Gambling problem? Call 1-800-GAMBLER.
Trade $25 and Get $25! on Kalshi with code COLLEGEPM
Trade on Kalshi → (opens in a new tab)Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.
21+. Gambling problem? Call 1-800-GAMBLER.
100% purchase match up to $100! on Rebet (mobile) with code COLLEGEPM
Get Rebet → (opens in a new tab)21+. Gambling problem? Call 1-800-GAMBLER.
Frequently asked questions
What does fee mean in prediction markets?
The platform's cut on a trade, withdrawal, or settlement. Eats into edge — calculate before sizing positions.
How does fee work in practice?
Kalshi charges a maker/taker fee scaled to price and volume. Polymarket US charges a price-based taker fee since October 2026 and trades in US dollars, so there are no crypto network fees.
21+ · T&Cs apply · Terms
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.
