Updated April 2026 · Independent guide · Not investment advice
What Is Polymarket & How Does It Work?
The plain-English version. How prediction markets work, where the prices come from, how Polymarket makes money, what it costs to trade, and how payouts actually happen when a market resolves. Independent — we're Polycopy, we sit on top of Polymarket's public data and we're not affiliated with the company.
TL;DR:Polymarket is the largest prediction market in the world. You buy YES or NO shares in real-world events for less than $1. If the event happens, each YES share pays $1. If it doesn't, $0. The prices — always between 0 and 100 cents — are the market's estimate of probability. It runs on Polygon, settles in USDC stablecoin, and uses the UMA oracle to resolve markets. To get started, see how to actually bet on Polymarket.
What is a prediction market?
A prediction market is a place where people buy and sell shares in the outcome of real-world events. Each share is a contract: if the event happens, the share is worth $1; if it doesn't, the share is worth $0.
The price of that share — somewhere between $0.00 and $1.00 — is the market's collective estimate of probability. A YES share trading at $0.42 means the market thinks there's a 42% chance the event happens. The closer to $1, the more likely; the closer to $0, the less likely. In American odds language, $0.42 is roughly +138; in European decimal odds, about 2.38.
Why this works: traders who think the market is wrong have a financial incentive to push the price toward what they believe is true. Decades of academic research find that prediction-market prices consistently outperform polls, pundits, and individual experts — especially for political and economic outcomes. New to the concept? Read our prediction markets for beginners guide for the longer version.
What makes Polymarket different
There are a handful of prediction-market platforms in 2026. Polymarket dominates by volume and market breadth, but each platform has a different approach:
| Platform | Currency | Custody | Resolution | Best for |
|---|---|---|---|---|
| Polymarket | USDC (Polygon) | Self-custody crypto | UMA oracle | Largest by volume; broadest market selection |
| Kalshi | USD | Centralized (CFTC-regulated) | CFTC-overseen | US users; sports event contracts |
| PredictIt | USD | Centralized | Manual / committee | US politics ($850 cap per market) |
| Manifold Markets | Mana (play money) | Platform-managed | Creator-resolved | Learning / play money |
For the full breakdown picked by use case, see our best prediction market app comparison.
Where the prices come from
Polymarket runs an order book for every market. Buyers post limit orders ("I'll pay 38 cents for 100 YES shares") and sellers post the opposite ("I'll sell 100 YES shares at 42 cents"). When the prices cross, a trade executes.
Because each YES share pays exactly $1 if the event happens, anyone who thinks the event is more likely than the current price will buy — pushing the price up — until the price matches their estimate. Anyone who thinks the event is less likely will sell. This back-and-forth between informed traders is what turns the price into a probability estimate.
The mechanism is roughly the same on every major prediction market platform. Polymarket's edge is depth — high-volume markets like presidential elections, Super Bowls, and Federal Reserve decisions tend to have penny-tight bid-ask spreads because the order book is thick enough to absorb large trades without much slippage.
Where the markets come from — and how they resolve
Polymarket itself creates the vast majority of markets. Each market is a precisely worded outcome contract: "This market resolves YES if [specific, verifiable event occurs] by [exact date and time], according to [defined source]." The wording matters — ambiguous wording is what causes disputes.
When the event date passes, a proposer (typically Polymarket itself or a market maker) submits a proposed outcome to UMA, the optimistic oracle Polymarket uses for resolution. UMA is a separate protocol with its own token (UMA), and resolution works like this:
- The proposer posts the outcome on-chain with a small bond.
- A 2-hour dispute window opens. During this window, anyone holding UMA tokens can dispute the proposed outcome by posting their own bond.
- If unchallenged, the proposal is finalized and the market settles. Most markets resolve this way — cleanly, within hours of the event.
- If challenged, UMA token holders vote on the correct outcome over the next 48 hours. The losing side of the dispute forfeits their bond.
Speculation about a Polymarket-native governance token has cycled for years — most recently driven by precedents like Hyperliquid's 2024 retroactive airdrop. We track every verified vs speculated signal on our Polymarket token & airdrop tracker.
How does Polymarket make money?
This is one of the most-asked questions because Polymarket's direct trading fees for retail traders have been very low (often 0% maker / 0% taker on standard markets). The business is funded through a combination of revenue streams that aren't obvious from the front-end:
- Selective platform fees. Some market types or large institutional flows carry small fees. Always check polymarket.com's help center for current rates — the fee structure has changed multiple times.
- Spread on pUSD ↔ USDC conversions. When you deposit, your USDC is wrapped to pUSD, Polymarket's internal collateral token. Wrap and unwrap can carry small spreads.
- Institutional & liquidity arrangements. Polymarket is the largest source of prediction-market data globally; data partnerships and institutional liquidity provider arrangements generate revenue.
- Investor capital. Polymarket has raised from Founders Fund, Vitalik Buterin, and other crypto-native investors. The company is well-funded and has not historically optimized for short-term fee revenue.
Bottom line: Polymarket is much closer to a "free trading" model than to a traditional sportsbook with embedded vig. The cost you actually feel is spread and slippage, not stated fees.
Polymarket fees — what to actually budget for
| Cost | Typical amount | Notes |
|---|---|---|
| Trading fee | ~0% retail standard markets | Some market types may carry a small fee. Verify on polymarket.com. |
| Bid-ask spread | 1-3 cents on liquid markets; wider on thin markets | The dominant trading cost. Use limit orders to avoid the spread. |
| Polygon gas | <$0.50 per deposit/withdrawal | Polygon is much cheaper than Ethereum mainnet. |
| Card / fiat ramp | Varies by partner provider | Card deposits go through partners (e.g. MoonPay) and carry their fees. |
| pUSD wrap/unwrap | Small spread or zero in most cases | USDC ↔ pUSD inside Polymarket. See our pUSD explainer. |
Practical rule of thumb: on liquid markets, you should expect to lose ~1-2% of your trade size to spread + gas combined. On thin markets, that can balloon to 5-10%+. Liquid markets are where Polymarket is most competitive against traditional prediction markets and sportsbooks.
Funding & withdrawal
Three ways to deposit:
- Debit card (in supported regions) — Polymarket integrates a fiat-on-ramp partner. The fee depends on the partner.
- Bank transfer (limited regions) — similar partner-based flow.
- Crypto transfer — send USDC on the Polygon network to your Polymarket deposit address. Sending USDC on Ethereum mainnet, Solana, or any other chain will not credit your account; recovery is possible but not guaranteed.
Once deposited, your balance is held inside the platform as pUSD — Polymarket's 1:1 USDC-backed collateral token.
Withdrawing reverses the flow. From the withdrawal screen, you can send your pUSD balance back to USDC on Polygon, to any wallet you control. Some regions support direct fiat off-ramps; most don't. The Polygon gas fee on a self-custody crypto withdrawal is typically under $0.50.
Polymarket does not custody fiat directly — fiat off-ramps go through partner providers, who set their own KYC requirements.
Is Polymarket safe? Is it legal?
Safety: Polymarket settles on the Polygon blockchain, which is auditable and battle-tested. The smart contracts are open source. Custody risk is real (your pUSD lives inside the platform until you withdraw) but the platform has not had a major exploit since launch in 2020. The biggest day-to-day risk is resolution risk on ambiguously worded markets — read the resolution criteria carefully before sizing up.
Legality: depends entirely on your jurisdiction. Polymarket geo-blocks US users following a 2022 CFTC settlement. The platform is available in most other countries, though some restrict prediction markets / event contracts. Using a VPN to circumvent a geo-block violates Polymarket's terms of service.
We have a separate, more detailed page on this: Is Polymarket legit? — ownership, regulatory history, US access.
Where to go next
How to actually bet on Polymarket
The step-by-step tutorial — account setup, first deposit, picking a market, placing a trade, and managing your position.
Copy trade winning Polymarket traders
Don't want to pick markets yourself? Polycopy ranks 500K+ Polymarket wallets by verified P&L. Browse the leaderboard or auto-copy the ones you trust.
Best prediction market app 2026
Polymarket vs Kalshi vs Manifold vs PredictIt — picked by use case, not hype.
Polymarket glossary
Quick definitions for every term you'll encounter — AMM, CLOB, resolution, UMA, pUSD, market maker, taker fee, and more.
pUSD — Polymarket's collateral token
The USD-pegged token that holds your trading balance inside Polymarket. 1:1 backed by USDC on Polygon. Not a speculative asset.
Is Polymarket legit?
Trust hub — ownership, regulatory history, US access, and how to verify any Polymarket-related news.
Ready to use Polymarket?
Open Polymarket directly, or browse Polycopy's leaderboard of the top 500K traders on the platform first — free.
Last updated: 2026-04-22. Independent guide from Polycopy. We are not affiliated with Polymarket. Not investment, legal, or tax advice.