Polymarket markets explained: how prediction markets work

A prediction market lets you trade on the outcome of a real-world event. On Polymarket, every question is turned into shares priced between $0.00 and $1.00. A share pays out exactly $1.00 if the outcome happens and $0.00 if it does not.

Because a winning share is worth a dollar, the current price reads directly as the market's implied probability. If “Yes” is trading at $0.62, the market is pricing roughly a 62% chance of that outcome. You buy Yes shares if you think the event is more likely than the price implies, or No shares if you think it is less likely.

You do not have to hold until the end. Prices move as new information arrives, so you can sell your shares at any time before the market resolves. Your profit is the difference between what you paid and what you sell or settle for. Buy Yes at $0.40, and if the event happens each share becomes worth $1.00, a $0.60 gain; if it does not, the share is worth nothing.

Binary (Yes/No). The simplest form: one question with two outcomes, such as “Will this happen by a set date?” You are buying Yes or No on a single event.

Categorical / multi-outcome. One winner is chosen from many, for example “Which candidate wins?” across a field of names. Each option trades as its own share, and across the whole field the prices sum to roughly $1.00, because exactly one outcome will resolve Yes.

Scalar / range. Some markets cover a numeric range rather than a single yes-or-no, resolving based on where a value lands within a band. These are less common but useful for data-driven questions.

Time-bound. Most markets carry a resolution date or deadline. Knowing when a market resolves matters, because it shapes how much time is left for the outcome, and the price, to move.

Polymarket runs on a Central Limit Order Book (CLOB), the same model used by stock exchanges. Buyers post bids and sellers post asks. The price you see is where the best bid and best ask meet, and the gap between them is the spread.

Two roles matter here. A maker posts a resting limit order that sits on the book and adds liquidity. A taker crosses the spread to fill instantly against those resting orders, removing liquidity. That distinction drives both the fees you pay and the rewards you can earn, which we cover next and in our guide to finding edge.

Polymarket's fee model rewards liquidity. Maker orders generally pay no fee, because resting limit orders make the market work. Taker orders pay a fee that is computed from a formula based on the number of shares and the price, so the exact cost depends on the trade.

Polymarket itself charges no deposit or withdrawal fees, though on the crypto-native international platform ordinary blockchain network fees can still apply when you move funds on-chain.

One nuance worth knowing: not every market charges fees. Some world-event and geopolitical markets can be fee-free. That is fine if you are simply trading a view, but it matters for anyone chasing maker rewards or referral rewards, since a fee-free market generates neither. Always confirm current fee details in the official docs.

A market is only as good as the way it settles. Polymarket resolves markets through the UMA optimistic oracle. After an event concludes, an outcome is proposed, and there is a dispute window during which anyone can challenge it. If it is disputed, the question goes through UMA's dispute-and-vote process before the final result is locked in.

Once resolved, the accounting is simple: winning shares are worth $1.00 each and losing shares are worth $0.00. Understanding the resolution source and the exact wording of a market matters, because well-written markets leave little room for ambiguity, and the wording is what the oracle ultimately judges against.

Polymarket spans politics, sports, crypto, economics, and geopolitics / world events. The breadth is part of the appeal: the same account can price an election, a token's year-end level, an interest-rate decision, and a championship.

One practical point for 2026: there are now two platforms, and the US app's market list is not identical to the international site's. Which markets you can access depends on which platform you are eligible for, so it is worth checking both when you plan what you want to trade. Our registration guide walks through the US and international paths.

Beyond trading for a view, Polymarket runs a Liquidity Rewards Program. Makers who post competitive two-sided limit orders that tighten the spread earn a share of daily reward pools, paid daily around midnight UTC. In other words, the platform pays you to make its markets more liquid.

That is a big reason serious participants automate. If you want to earn spread and rewards systematically, see our guide to building a trading bot. And if you want to understand whether any strategy actually has an advantage after costs, read how to find and measure edge. Both build directly on the mechanics above.