4 min read
Polymarket fees explained
Last updated · fact-checked against live Kalshi and Polymarket data
Quick answer
Key takeaways
- › Polymarket US advertises no platform fee.
- › The spread is a real cost, especially in thin markets.
- › Funding charges depend on the payment method shown in the app.
- › Use limit orders when you want more control over execution.
- › Compare the total quoted cost with Kalshi for the same market.
The full cost stack
- Platform fee: Polymarket US advertises a $0 platform fee.
- Spread: The gap between the best buy and sell prices is a real execution cost.
- Funding: Any payment-method charge is shown in the app and can vary by method.
- Liquidity: Larger orders can move the displayed price in thinner markets.
- Taxes: Keep records and get professional advice for your filing situation.
When Polymarket compares well with Kalshi
On deep markets, Polymarket US's advertised $0 platform fee can be attractive. On thinner markets, a wider spread or price impact can outweigh that headline. Compare the exact market, displayed quote and contract rules before deciding.
Cost comparison — Polymarket US vs Kalshi
| Cost line | Polymarket US | Kalshi |
|---|---|---|
| Platform trading fee | $0 advertised | Contract fee shown at trade |
| Spread | Varies by market | Varies by market |
| Funding | Check app quote | Check funding method |
| Settlement | USD in the U.S. app | USD |
| Tax records | Keep your own records | U.S. tax documentation may be issued |
The most reliable comparison is the quote shown immediately before you submit the same type of trade on each platform.
Florida angle
Polymarket US is available to eligible Florida users through its iOS app. Review the current terms and offer eligibility before depositing; Florida has no state individual income tax, but federal reporting may still apply.
Welcome offer · Polymarket US
Deposit $10, get a $50 trading bonus
New users: fund at least $10 in the Polymarket US app, enter the code, and get a $50 trading bonus.
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.
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.
Play responsibly
Prediction markets are real-money trading and you can lose your full stake. We recommend 21+. If trading stops feeling fun, call 1-800-GAMBLER or text 988.
Reviewed by Catie Di Stefano. Every guide follows our editorial standards & review methodology. Affiliate links are disclosed under our affiliate disclosure.