How Prediction Markets Work — A Complete Guide
Learn how prediction markets like Polymarket and Kalshi work, how odds are set, and how to trade event contracts.
What Are Prediction Markets?
Prediction markets are exchange-traded markets where participants buy and sell contracts based on the outcome of future events. The price of each contract reflects the market's estimate of the probability that the event will occur. If you buy a 'Yes' contract at $0.35, the market thinks there's a 35% chance that event happens. If it does happen, your contract pays out $1.00 — a profit of $0.65.
How Do Odds Work?
Prediction market odds are expressed as prices between $0.01 and $0.99. A contract priced at $0.70 means the market estimates a 70% probability. These prices move continuously based on supply and demand — when more people buy 'Yes', the price goes up, and vice versa. This makes prediction markets one of the most accurate forecasting tools available, often beating polls and expert opinions.
Polymarket vs Kalshi vs DraftKings
Polymarket is the largest crypto-based prediction market (USDC). Kalshi is CFTC-regulated and trades in USD. DraftKings and FanDuel have entered with event contracts for sports and politics. Each has different markets, fees, and liquidity. VoxOdds compares odds across all platforms so you can find the best price.
How to Find an Edge
The key to profitable prediction market trading is finding mispriced contracts. VoxOdds helps by showing divergence between crowd sentiment and market prices, cross-platform odds comparison, and AI-moderated community analysis. When the crowd sees something the market hasn't priced in, that's your edge.
Key Strategies
1) Arbitrage: Buy on one platform, sell on another when odds diverge. 2) Contrarian: Bet against the crowd when you have unique information. 3) Calendar plays: Markets near expiration with clear outcomes. 4) Portfolio approach: Spread risk across many uncorrelated markets.
Ready to find your edge?
Browse live prediction markets, compare odds, and see what the crowd thinks.