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 and Kalshi
Polymarket is a crypto-based prediction market using USDC. Kalshi offers regulated event contracts in USD. Each venue has different contracts, rules, fees, liquidity, and eligibility. VoxOdds currently compares displayed probabilities across these two venues; verify the live order book and rules before treating either as the better executable price.
How to Research an Edge
Prediction market research usually starts with a price you believe is wrong, then tests that view against liquidity, rules, timing, and source-of-truth risk. VoxOdds helps by showing crowd divergence, cross-platform odds comparison, AI-moderated community analysis, and backtested signal research.
Key Research Patterns
1) Cross-platform spreads: compare equivalent events across venues. 2) Contrarian research: challenge crowded moves when you have better evidence. 3) Calendar plays: read resolution rules carefully near expiration. 4) Portfolio approach: avoid concentrating risk in one fragile market.
Ready to find your edge?
Browse live prediction markets, compare odds, and see what the crowd thinks.