Polymarket Explained: How It Works, Fees, and Risks

Polymarket is the most widely used prediction market in the world, a place to trade on the outcome of real events. Where you can use it depends on where you live, and the US picture changed at the end of 2025. If you have only seen it through screenshots on X, here is how the platform actually works underneath.

What you are actually trading

Polymarket is a prediction market. You buy and sell shares in the outcome of a real event, and each share settles at $1.00 if the outcome happens or $0.00 if it does not.

Prices live between those two ends and read as probabilities. A share at $0.40 means the market puts the outcome at about 40 percent. Buy it, and if the event resolves your way, every share pays a dollar. If you are new to reading these numbers, start with our guide on how to read prediction market odds.

The structural feature that separates this from a bet slip: you can sell your position at any time before the event resolves. Prices move continuously, so a share you bought at $0.40 can be sold at $0.55 a week later without the underlying event ever finishing.

International versus US: two different products

This is the part most online guides get wrong, because the situation changed recently.

Internationally, the original Polymarket platform serves most countries outside the US. It has been geoblocked for US IP addresses since the 2022 CFTC settlement, so it is the version most non-US readers will use.

In the US, there is a separate product, operated through QCEX, a licensed Designated Contract Market that Polymarket acquired, running under CFTC oversight with full KYC identity verification. It launched in Q4 2025. Federal authorization is real, but some states still contest event contracts on sports, so what you can trade may depend on where you live.

The two products do not share the same rules, fee schedule, or available markets. Always confirm which one applies to you, and check your own local laws regardless of what the platform allows. This is not legal advice, and state-level rules are still moving.

Funding your account

Settlement happens in USDC, a dollar-pegged stablecoin. If you are unsure how that differs from other stablecoins, our USDT vs USDC vs DAI comparison covers it.

The platform itself charges no deposit fee, but the path you take to fund the account does cost something:

Cheapest: buy USDC on an exchange and withdraw it to your Polymarket wallet on Polygon. Total cost is often under a dollar.
Most expensive: a debit card purchase through a third-party processor can run 2 to 3 percent. On a $1,000 deposit that is $20 to $30 gone before your first trade.

The funding route is a cost you control. Pick it deliberately.

Fees

Fee figures below are as reported for the US regulated product as of June 2026. Verify the current schedule on the platform before trading, because fees differ between the US and international products and have changed before.

Trading: the US regulated exchange is reported to charge a 0.30 percent taker fee with a 0.20 percent maker rebate, meaning you pay to take liquidity and earn a small rebate for providing it. The international platform historically charged no trading fee at all.
Deposits: none from the platform.
Withdrawals to a US bank: reported to settle in 1 to 2 business days through the QCEX clearinghouse, with a standard daily cap around $50,000.

How markets settle

A market is only as trustworthy as the way it resolves, and Polymarket does not have a referee. It uses the UMA Optimistic Oracle, a decentralized system. The mechanics, per Polymarket's own documentation:

After the event ends, an approved proposer submits the outcome and posts a bond, typically around $750.
A challenge window of about 2 hours opens. Anyone who thinks the proposal is wrong can dispute it by posting a counter-bond.
If nobody disputes, the market resolves and the proposer recovers the bond plus half the disputer's stake.
If it is disputed twice, the question escalates to UMA's Data Verification Mechanism, where token holders vote, a process that takes roughly 48 hours.

In practice an uncontested market resolves in about 2 hours. A disputed one can take 4 to 6 days. For a clear sports result this is almost always fast and uneventful, but the dispute layer is a real piece of how the platform works, not a footnote.

The fastest way to lose money you thought was safe is to skip the rules tab. A market can resolve against someone who was right about what happened on the field but wrong about how the contract defined it. The event and the market are not the same thing. Read how a market settles before you read the odds, not after.

The risks that actually matter

Total loss is the base case for any losing position. Shares that resolve against you go to zero. There is no partial credit.
Resolution risk is small but real. An oracle and a set of written rules decide what your shares are worth, not a universal arbiter of truth. Read the rules tab of any market before you trade it.
Liquidity is uneven. Headline markets are deep. Obscure ones are thin, and thin markets cost you slippage on the way in and out.
Regulatory ground is still shifting. State-level treatment of event contracts is being litigated. Access you have today may not be permanent.
No leverage, which is a feature. Your maximum loss on a standard position is what you paid. There is no margin call. That is one risk the platform does not carry.

Is it worth using

If you want exposure to an event's outcome with a clear maximum loss, transparent pricing, and the ability to exit early, prediction markets do something a bookmaker does not. If you want a slot machine, this is the wrong tool, and treating it like one is how people lose money on it.

For a direct comparison with traditional betting, see our guide on prediction markets versus sportsbooks.

Fee, withdrawal, and resolution details were gathered from Polymarket's documentation and public reporting as of June 12, 2026 and may change. Verify current terms on the platform. This article is for information only. It is not financial, investment, or legal advice. Prediction markets involve risk of total loss. This page contains an affiliate link to the international Polymarket platform, and we may receive a referral fee if you sign up through it. The international platform is not available to US residents, who use the separate CFTC-regulated US product that this link does not cover. Check whether it is available where you live before signing up.