Trading & Fees
What it is
Trading on Polymarket is centered on a central limit order book. That means price, spread, and execution quality depend on the orders resting in the book rather than on a simple fixed quote from a house.
Why it matters
Understanding order-book trading helps you avoid common mistakes like paying up for speed, using large marketable orders in thin markets, or ignoring spread and slippage.
How it works
Every trade you execute falls into one of two categories, which directly determines the fees you pay:
- Maker: If you place a limit order that rests on the book, you are providing liquidity.
- Taker: If your order immediately matches resting liquidity, you are taking liquidity.
The exact fees can vary by market type and platform policy. Polymarket's own help pages are the right place to confirm the current schedule, especially for fast-turnover or special market categories.
[!IMPORTANT] Check current fee policy: Trading costs are not just about headline fee percentages. Spread, slippage, and the type of order you place also matter.
Example
Imagine a Polymarket contract: "Will Bitcoin hit $100k in February?" with the current "Yes" share trading at $0.40.
Scenario A (Maker): You believe it will hit $100k, but you only want to pay $0.35 per share. You place a Limit Order to buy 1,000 shares at $0.35. Because the current price is $0.40, your order waits on the order book. When someone finally sells to you at $0.35, you pay $0.00 in fees.
Scenario B (Taker): You want those 1,000 shares right now. You place a marketable order. The system starts filling at the best available asks, and if the book is thin your average price can rise as you consume more liquidity.
Risks
- Slippage: If you use large marketable orders in low-liquidity markets, you will "eat through the order book." You might intend to buy at $0.40, but if there are not enough shares available at that price, your order may start filling at $0.41, $0.42, and higher levels.
- Unfilled Limit Orders: If you exclusively use Limit Orders to avoid fees (Acting as a Maker), and the market suddenly moves away from your price target, your order will never fill, and you will miss the opportunity entirely.
- Fee assumptions: Traders often remember an old fee schedule and trade as if it still applies. That is a mistake on time-sensitive platforms.
FAQ
Q: Do I have to pay Polygon Gas Fees when I trade? You should check the current Polymarket documentation for the latest answer. Trading, approvals, deposits, and withdrawals do not always have the same cost structure.
Q: Where do the Taker Fees go? Does Polymarket keep them? Fee treatment can change by product or platform policy, so rely on the official fee and rebate pages rather than a static summary.
Q: What matters more than the posted fee? In many markets, spread and slippage matter more than the quoted fee number.