How Does Polymarket Work?

The Short Answer

Polymarket turns questions into tradable markets. Each market has two sides, Yes and No, and each side trades as a share between $0.00 and $1.00. If a Yes share costs $0.65, the market is saying there is roughly a 65% chance the event happens. You buy when you think the real probability is higher than the price, sell when you think it is lower, and when the event resolves, winning shares pay out $1.00 while losing shares pay $0.00.

There is no house on the other side of your trades. Orders are matched peer-to-peer through a central limit order book, positions are tokens on the Polygon blockchain, and the platform never takes custody of your money.

What Is Polymarket?

Polymarket has operated since 2020, run by Blockratize, Inc. It has processed roughly $55.6 billion in trailing twelve-month volume and settles every trade on-chain. Markets span politics, sports, crypto prices, economics, and current events: anything with a verifiable outcome and a published resolution source.

Structurally, Polymarket is not a sportsbook or a casino. It is an exchange: users trade with each other, and the platform runs the matching engine and the settlement rails. If the category is new to you, start with our prediction markets guide. The rest of this page is Polymarket.

Shares, Prices, and Probabilities

Depositing $1 of collateral into a market creates one Yes share and one No share. Together they are worth exactly $1.00 at resolution, because exactly one of them wins. That is why the two sides price as complements: if Yes trades at $0.65, No trades at $0.35.

A share price is the market's implied probability, and it moves as information arrives: a candidate gaffes and their Yes share slides from $0.70 to $0.55; a poll drops and it jumps back up. You can sell at any time before resolution, so your profit or loss is not locked in until you trade or the market settles.

Positions are ERC-1155 tokens on Polygon, recorded as conditional tokens held in your own wallet. The shares are yours, not the platform's, and you can transfer or sell them like any other on-chain asset.

Where Orders Get Matched

Prices are set by a central limit order book. Every open order, bid or offer on either side, sits in the book until someone takes it or its owner cancels. You can cross the spread and take the best available price immediately, or post a limit order at the price you want and wait to get filled.

The spread is a real cost: the gap between the best bid and best ask, wider on thin markets than deep ones. Liquidity matters too. Headline markets can trade millions of dollars a day, while a niche market might move two cents against you on a small order. Check the book before you size up.

Your wallet is your account. Polymarket is non-custodial: you hold the keys, and new users get an embedded wallet at signup with a recovery path through recovery.polymarket.com. API and bot users trade through deposit wallets that validate orders cryptographically.

How Markets Resolve

Every market publishes its resolution criteria and the source of truth (an official election result, an exchange price, a government report) before you can trade it. When the event concludes, resolution runs through UMA's Optimistic Oracle: someone proposes the outcome with a bond at stake, a challenge window opens, and if nobody disputes the proposal, it finalizes. A dispute escalates to UMA token holders for adjudication.

Once an outcome finalizes, each winning share becomes redeemable for exactly $1.00 from the collateral held by the smart contract. Contested markets can take days or weeks longer to settle while a dispute runs, so read the resolution source and the end date before you trade.

How to Use Polymarket, Step by Step

1. Create a wallet. Signing up generates a non-custodial wallet tied to your login. There is nothing to install, but back up your recovery method. It is the only way back into the account.
2. Fund it. Deposits arrive as USDC on Polygon, sent from an exchange or another wallet. Inside Polymarket the collateral shows as pUSD, an ERC-20 token backed one-to-one by USDC, with the backing enforced on-chain.
3. Pick a market and read the rules. Check the resolution criteria, the source, and the end date. If any of those are vague to you, pick a different market.
4. Buy Yes or No. Decide what you think the true probability is, compare it to the quoted price, and place a market order to fill now or a limit order at your price.
5. Manage the position. Sell before resolution if the price moves your way, or hold to settlement if you believe the market is still mispriced.
6. Redeem or collect. At resolution, winning shares redeem for $1.00 each. Sales and redemptions settle in your wallet on Polygon.

What It Costs and What You Can Lose

Your baseline costs are the spread between bid and ask, any fee the platform currently shows on the order ticket, and the network cost of moving funds on Polygon, which is small. Polymarket's fee schedule has changed more than once since launch, so check the current terms on the market page rather than trusting a number from an old article.

On losses: as of publication there is no margin and no leverage, and shares cannot go below $0.00, so the most a position can lose is what you paid for it. The real risks are subtler: being on the wrong side of a probability judgment, and holding an illiquid market you cannot exit cleanly. Size positions like they can go to zero, because they can.

US Users: The Split Platform

In the United States there are two Polymarkets. The international exchange blocks US users itself and restricts 39 countries and territories in total. US customers are routed to Polymarket US, a separately regulated venue operated by QCX LLC as a CFTC-designated contract market since July 9, 2025: mandatory KYC, a narrower market catalog, and fully collateralized positions.

The full legal picture (the 2022 CFTC settlement, the geoblock, state-level fights, and what would have to change) is in our guide to Polymarket's legal status. The mechanics on this page apply to both venues.

Manual Trading vs Automation

Everything above assumes you are the one clicking. Manual trading works when you have an edge in a specific domain and the time to act on it. Markets move around the clock, and the best entries often appear at inconvenient moments. It also carries a behavioral cost: losing positions are the hardest ones to sell.

Automation takes two forms. Self-hosted bots are scripts or open-source projects you run yourself: flexible, but you own the infrastructure and the bugs (our Polymarket bots comparison covers the main options). Hosted copy trading is the other route: you pick a leader whose track record you trust, set your own risk parameters, and software mirrors their positions into your own wallet.

Common Questions

Do I need crypto experience to use Polymarket?

No. Signup creates a wallet for you and funding accepts USDC sent from any exchange or wallet. If you have never moved crypto before, the learning curve is one deposit.

Can a share price go above $1.00 or below $0.00?

No. A winning share pays exactly $1.00 and a losing share pays $0.00, so prices are bounded between those values. Buying at $0.65 and selling at $0.85 before resolution is a normal, complete trade. You do not have to wait for the event.

Who decides which outcome wins?

The market's published resolution source, read through UMA's Optimistic Oracle. A proposed outcome stands unless someone disputes it with a bond; disputes escalate to UMA's adjudication process.

Can I lose more money than I put in?

On the international exchange, no: there is no margin or leverage, and shares cannot go negative, so the most a position can lose is its cost. Elsewhere, leveraged products change that answer. On Polymarket today, they do not apply.

Is Polymarket gambling?

Legally, event contracts are regulated as derivatives, not sportsbook wagers. State regulators contest that framing in some places. Our legal guide covers the fight state by state.

Where BlockRotate Fits

BlockRotate is the hosted copy-trading route. You choose a leader, set your risk parameters, and a bot mirrors their positions into your own wallet, with no code or server to run. The mechanics are unchanged: you still trade shares priced by the order book, and they still settle on-chain. For the full workflow, see our Polymarket copy trading guide.