How prediction market fees actually work in 2026

You open a prediction market app, see a contract at 60¢, buy it, and later notice your balance is a little lower than the arithmetic says it should be. That gap is the fee, or the spread, or both. Prediction market fees in 2026 come in four layers: a trading fee charged by the platform, a maker or taker distinction that decides who pays it, funding costs at the edges, and the spread, which is never labelled as a fee but behaves like one.

This post walks through each layer using the platforms' own pages, with the date each page showed. Fee schedules change often, so treat the numbers below as a snapshot and check the source before you trade.

What is the basic trading fee on a regulated exchange?

Kalshi, the CFTC-regulated exchange, explains on its help page (dated 19 April 2026) that it makes money by charging a transaction fee on the expected earnings of a contract. That wording matters. The fee is not a flat commission per trade. It is tied to the price you pay, so a contract near 50¢ costs more to trade than one at 95¢.

The same page says some markets, such as those tied to major events, have different fees, and it sends readers to a separate fee schedule PDF for the exact formula. We could not open that PDF when researching this post, so we are not quoting a formula here. If you plan to trade size on any exchange, read the schedule itself rather than a blog summary, including ours.

What do maker and taker mean?

A taker removes liquidity: you submit an order that matches immediately against a resting order. A maker adds liquidity: you post a limit order that waits in the book until someone else trades against it. Kalshi's orderbook help page, dated 10 March 2026, describes bids as the maximum price a buyer will pay and asks as the minimum price a seller will accept.

On the fee side, Kalshi's fee page says some markets charge maker fees on resting orders, only when a trade executes, and that there are no fees for canceling a resting order. The page does not give the rates. The practical lesson is that patience can be cheaper than speed, because a resting order often pays less than a marketable one, and sometimes nothing.

Polymarket has taken the idea further. In an article published on 1 April 2026, Tanner Lux of PokerNews reported that makers pay no fees and can earn rebates of 20% to 25% of taker fees. Taker fees, he wrote, run roughly 0.75% to 1.8% and are highest when a market trades near 50%.

How did Polymarket's fees change in 2026?

Until spring 2026, Polymarket charged taker fees only in crypto and sports markets. A Finbold report republished by KuCoin on 25 March 2026 said fees would extend to finance, politics, economics, culture and weather markets from 30 March 2026, while geopolitics and world events stayed fee-free. It put the post-update peak effective rate for crypto at about 1.80%.

The rollout was not smooth. The PokerNews article reports that traders noticed unexpectedly high fees on very low-priced trades, especially in weather and economics markets. Polymarket said the fees had been tied to USD taker volume, which created distortions at the tails. On 31 March 2026 it switched to a share-based calculation.

The story is a useful reminder that fee design is a live decision, not a constant. A schedule that looked fine on paper produced odd results at extreme prices within a day of going live.

Are there deposit and withdrawal fees?

It depends on how money moves. Kalshi's deposits page, dated 24 August 2026, says there are no fees for bank deposits and sets a $10 minimum. It does not list fees for debit card, wire or crypto deposits, and it does not state withdrawal fees on that page, so we will not guess.

Crypto platforms add a different kind of cost. Moving funds on a blockchain involves network charges and, often, a third party. Any fee there is set by the wallet, exchange or bridge you use rather than by the market, which makes it easy to overlook when you compare platforms.

Is the spread a hidden fee?

Yes, in the sense that matters to your balance. The spread is the gap between the highest bid and the lowest ask. Kalshi's orderbook example shows a Yes bid of $0.71 against a Yes ask of $0.74, a gap of $0.03. If you bought at 74¢ and sold straight back, you would receive 71¢, a 3¢ loss before any stated fee.

Nobody charges you for the spread. It goes to whoever is willing to quote both sides, and it is the reason a thin market can cost more than a busy one even when the headline fee is zero. A platform with no trading fee and a wide spread can be dearer than a platform with a fee and a tight one.

Spread is also where slippage lives. A market order fills at the best available price at that moment, which may not be the price you saw. In a deep market the difference is small. In a niche market it can be most of your expected edge, and it is the honest limit on how much a small, obscure contract can tell you.

What does free-to-play actually cost?

Ravioli has no trading fee, no deposit fee and no withdrawal fee, because nothing is deposited and nothing is withdrawn. You trade with Sense, free credits shown in ¢, and new accounts start with 1,000 Sense. There is no money at risk. The prizes are real.

That does not make it costless. The costs are different. The first is time: you spend attention reading markets, forming a view and waiting for resolution. The second is that Sense cannot be cashed out, so a good run buys you standing on the board and a shot at prizes, not a balance you can withdraw. The third is the spread, which exists here too. Ravioli runs an automated market maker for instant trades and a limit order book, both in play credits, and the price you get on an instant trade differs a little from the mid price.

If you want to see how pricing and settlement work before comparing platforms, how market odds and resolution work covers it, and free Kalshi alternatives lays out the no-deposit options.

How should you compare costs between platforms?

Pick a trade, such as 100 contracts at 60¢, and price it on each platform in full. Include the trading fee, whether you would be a maker or a taker, the current spread, and the cost of getting money in and out. Then check the date on each fee page. Several of the figures in secondary comparisons circulating in 2026 disagree with each other, which is a good reason to prefer the platform's own page.

Finally, remember that fees only matter if you have an edge to protect. A strategy that earns 1% before costs and pays 1.5% in fees is a loss, however clever the forecasting behind it.

Ravioli is a free-to-play prediction market. You trade with Sense, which is free, and the prizes are real.

Create a free account and browse the board.