Polymarket fees explained
Polymarket's fee model looks strange next to a sportsbook's, and that difference is the entire story. Here's what you pay and how it compares.
The fee is charged on the trade, not baked into the price
A sportsbook does not charge you a visible fee. It moves the line instead: both sides of a coin flip are offered at −110, so you risk $110 to win $100. The margin is hidden inside the odds, which is exactly why the two sides of a book add up to more than 100%.
A prediction market does the opposite. The price is the market's honest probability — the two sides of a binary market sum to about 100¢ — and the venue charges an explicit, separate fee on the trade. You can see it, which means you can price it.
Sportsbook: margin hidden in the odds. Prediction market: probability in the price, fee charged openly on top.
Why the fee peaks at 50¢
Polymarket US charges takers a fee derived from a coefficient (published as theta), the number of contracts, and the price you trade at. The shape that formula produces is the important part: the fee is largest around 50¢ and shrinks as the price moves toward either extreme.
That is deliberate. A share at 50¢ carries the most uncertainty and the most value in matching; a share at 3¢ or 97¢ carries very little. Charging proportionally to that means a longshot position is not eaten alive by costs.
As of July 2026 the schedule was consolidated to a single coefficient across categories, with a maximum taker fee in the region of $1.50 per 100 shares at the 50¢ peak. Treat any specific figure — including that one — as a snapshot: exchanges revise fee schedules, and the live schedule is the only authority.
Makers can earn instead of pay
Only the taker — the person crossing the spread — pays. If you post a limit order and someone else fills it, you are the maker, and Polymarket US rebates you a share of the fee collected on that match. The rebate share has differed by category over time and has been in the region of a quarter of the matched taker fee.
The practical consequence for anyone trading more than occasionally: patience is a discount. Posting a limit order and waiting is structurally cheaper than hitting the current price.
- Taker (crosses the spread): pays the fee.
- Maker (posts an order that gets filled): pays nothing and may earn a rebate.
The cost that is not a fee: the spread
In a thin market the gap between the best bid and the best ask can cost you more than any fee. If a market is quoted 30¢ / 36¢, you are down six cents of implied probability the moment you cross — several times the explicit fee.
This is why volume matters more than the fee schedule for most people. A deep market with a one-cent spread is cheaper to trade than a quiet one with no fee at all.
Check the spread before you check the fee. On thin markets the spread is the larger cost by far.
So how does it compare?
A standard −110 sportsbook line implies a hold of roughly 4.5% of the amount wagered on a two-sided market. An explicit taker fee peaking near 1.5% of notional at the worst point on the curve, with a rebate available if you post rather than take, is a materially different cost structure.
That comparison is the honest case for prediction markets over a book — not that they are free, but that the cost is visible, smaller at the peak, and avoidable at the edges. What it does not do is make a bad forecast profitable.
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Browse live oddsFrequently asked questions
- Does Polymarket charge a fee to deposit or withdraw?
- Deposit and withdrawal handling differs between Polymarket US and the global platform and has changed over time. Check the operator's current fee schedule rather than a third-party summary, including this one.
- Are prediction market fees cheaper than a sportsbook?
- Structurally, yes, on a like-for-like two-sided market: a −110 line implies roughly a 4.5% hold, while the explicit taker fee peaks well below that and falls away toward the price extremes. The spread on illiquid markets can erase that advantage, so liquidity matters as much as the schedule.
- How do I pay the least?
- Post limit orders instead of crossing the spread, trade markets with real volume, and avoid repeatedly entering and exiting the same position — every round trip pays the taker fee twice.
- Do fees change?
- Yes. The schedule was revised in July 2026, and categories that previously carried different coefficients were consolidated. Always confirm against the live fee schedule before sizing a trade.
Keep learning
Prediction markets carry real risk of loss. Nothing on Market Guy is financial advice — it is research tooling to help you think, not a signal to trade.