Polymarket US fees calculator
Polymarket US vs Kalshi, one fill
Rounded to the nearest cent (round half to even).
Rounded up to the next cent per fill.
At 50¢, Kalshi costs 0.01¢ more per contract, all-in, on 100 contracts. Fees only: the contract prices themselves differ by venue.
Worked examples: 100 contracts, taker
| Price | Polymarket US fee | All-in / contract | Kalshi fee | All-in / contract |
|---|---|---|---|---|
| 10¢ | 63¢ | 10.63¢ | 63¢ | 10.63¢ |
| 25¢ | $1.30 | 26.30¢ | $1.32 | 26.32¢ |
| 50¢ | $1.74 | 51.74¢ | $1.75 | 51.75¢ |
| 75¢ | $1.30 | 76.30¢ | $1.32 | 76.32¢ |
| 90¢ | 63¢ | 90.63¢ | 63¢ | 90.63¢ |
Fees only, on one fill at the same price on both venues. The contract prices themselves differ by venue; for live prices after fees see best price.
How the Polymarket US fee works
The fee is Θ × C × p × (1 − p), where C is the number of contracts and p the price in dollars. Θ is 0.0695 on most markets and 0.1 on table tennis. The p × (1 − p) term peaks at 50¢, so a coin-flip contract carries the highest fee and a 90¢ or 10¢ contract much less. Kalshi uses the same shape at 7% × price × (1 − price).
Fees and rebates round to the nearest cent with banker's rounding. Combo trades use a separate curve and pay no maker rebate.
Maker rebate tiers (prior calendar month's maker volume)
| Tier | Maker volume | Maker Θ |
|---|---|---|
| 1 | Below $10M | no rebate |
| 2 | $10M to $50M | −0.0035 |
| 3 | $50M to $200M | −0.007 |
| 4 | $200M and up | −0.0104 |
Sources: Polymarket US fee schedule (effective Oct 19, 2026, read Oct 22, 2026) · Kalshi fee schedule (read Sep 23, 2026). Each venue's schedule governs.
Frequently Asked Questions
How much are Polymarket US fees?
Polymarket US charges a taker fee on each fill: Θ × contracts × price × (1 − price), with Θ = 0.0695 on most markets, so it peaks at 1.74¢ per contract on a 50¢ contract and shrinks toward the extremes. It's paid whether the position wins or loses. Resting (maker) orders pay nothing; a rebate starts above $10M of monthly maker volume. Kalshi charges 7% × price × (1 − price), at most 1.75¢.
Are Polymarket US fees higher than Kalshi’s?
The same or a cent or two lower: the Polymarket US rate is a little below Kalshi's, and Kalshi rounds up. On 100 contracts at 50¢ the Polymarket US taker fee is $1.74 and Kalshi's is $1.75. The bigger difference is usually the contract price itself, which differs by venue.
Does Polymarket US charge maker fees?
No. A resting order that gets filled pays nothing. Makers earn a rebate only above $10M of maker volume in the prior calendar month, in four tiers.
Do Polymarket US fees differ by market?
Table tennis markets use a higher taker rate (Θ = 0.1). Combo trades use a separate fee curve and pay no maker rebate; see Polymarket US's fee schedule. Every other market uses Θ = 0.0695.
How are Polymarket US fees rounded?
To the nearest cent, with banker's rounding (a half cent rounds to the even cent). Kalshi rounds up to the next cent on every fill, so the two can differ by a cent on the same exact fee.
Is the fee charged if the position loses?
Yes. The taker fee is charged at the fill, when you enter, whether the position later wins or loses.
Sponsored by Polymarket US
18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See https://polymarketexchange.com/files/legal/Polymarket%20US%20Rulebook%20(2026.09.30).pdf 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.