How Does Polymarket Work? Complete Beginner's Guide
Key takeaway: Polymarket is a decentralised prediction market where traders buy YES/NO shares on real-world events using USDC on the Polygon blockchain. Smart contracts handle all settlements automatically.
How does Polymarket work? At its core, Polymarket is a prediction marketplace: instead of betting against a bookmaker's margin, you trade against other users who disagree with your prediction. Prices reflect the crowd's collective probability estimate — updated in real time as news breaks.
The basics: prediction markets
A prediction market lets you buy shares in outcomes. Each share pays out $1 if the event resolves YES, or $0 if it resolves NO. If you buy a YES share at 40 cents ($0.40), you're saying there's a 40% chance of that event happening. If you're right, you double your money. If you're wrong, you lose your stake.
Unlike traditional bookmakers, Polymarket doesn't take a margin (the "vig"). The price is set purely by supply and demand among traders.
How Polymarket uses blockchain
Polymarket runs on the Polygon blockchain (a layer-2 network built on Ethereum). This means:
- All transactions are transparent and verifiable on-chain
- Smart contracts handle deposits, trades, and payouts automatically
- Polymarket's team cannot freeze funds or manipulate outcomes
- Settlement happens in minutes, not days
USDC: the currency of Polymarket
All trading on Polymarket uses USDC (USD Coin), a stablecoin pegged 1:1 to the US dollar. You never have to worry about crypto volatility affecting your trading account — 1 USDC is always worth $1.
How markets resolve
When the outcome of an event is known, Polymarket uses the UMA Oracle (Universal Market Access) to settle markets. A "proposer" submits the outcome; there's a 2-hour dispute window; if uncontested, the payout is final. Disputed markets go to a UMA token-holder vote — a decentralised arbitration system.
Getting started on Polymarket
- Create an account — sign up with email and complete KYC verification
- Deposit USDC — use MoonPay, a bank transfer, or an existing crypto wallet
- Browse markets — politics, sports, crypto, pop culture and more
- Buy shares — tap YES or NO and enter your stake
- Track and exit — sell your position at any time before resolution
PolyGram makes this entire process simpler with a mobile-first interface and email-based login. Start trading on PolyGram →
Why Polymarket prices are accurate
Prediction markets have consistently outperformed polls and expert forecasts. During the 2024 US election cycle, Polymarket's probability estimates proved more accurate than most major polling aggregators. The reason: traders have real money on the line, which incentivises honest assessment.