A prediction market is a market where you trade the outcome of a real-world event. The price is the probability. If a contract trades at 63¢, the market is saying there is a 63% chance it happens.
That is the whole idea. Simple to say. Powerful to trade.
How a prediction market works
Every market is a question with a price.
Most are binary. Yes or No. "Will the Fed cut rates in September?" A Yes contract settles at $1 if it happens and $0 if it doesn't.
So the price isn't arbitrary. It's the crowd's live probability, re-priced every time money moves. The conversion between prices, betting odds, and percentages — and why sportsbook odds always sum past 100% — is covered in our implied probability guide.
Every one of those re-prices is a public trade. A live whale tracker shows what the biggest traders are doing the moment their fills print, down to the wallet.
You make money the way you make money anywhere: buy what's underpriced, sell what's overpriced.
What you can trade
Anything with a verifiable outcome.
- Elections and politics.
- Economics: rates, inflation, jobs.
- Sports, weather, and culture.
Prediction markets are the derivatives layer on top of the entire world. If you have a view, you can price it.
Where prediction markets live
Three venues matter most.
- Kalshi: a U.S. exchange regulated by the CFTC, legal in all 50 states, settling in dollars.
- Polymarket: the largest prediction market by volume, crypto-based, with deep liquidity.
- Predict.fun: a newer on-chain venue expanding the map.
Same events. Different books, different prices, different access. Wondering if the biggest US venue is above board? Read is Kalshi legit. If you are weighing the venues, read our Kalshi review. For the full breakdown of how Kalshi contracts work, read how does Kalshi work. Weighing venues beyond the big two? Start with Polymarket alternatives.
The fee structures also differ between venues. Polymarket charges nothing on political and economic markets. For the full breakdown: Polymarket fees explained. Active traders who want to reach all three venues from a single account can read one account for every prediction market.
Why they matter now
Prediction markets are becoming a new asset class.
Not a novelty. Not a betting gimmick. Real instruments for pricing the future, used by traders who move early, act with conviction, and want an edge.
Institutional money is arriving. The tooling has to keep up. Some traders skip the research entirely and just mirror the winners. That is Polymarket copy trading. For the full range of approaches top traders use — event-based, arbitrage, market making, and copy trading — read the Polymarket trading strategies guide.
How to trade them like a pro
Knowing what a prediction market is gets you in the door. Trading it well is a different game.
The native web apps were built for browsing. Not for trading.
Serious traders don't live in a default web app. They trade through terminals: sub-second data, aggregation across venues, real order types.
Before executing, serious traders also do their homework. Polymarket analytics tools surface wallet performance, price history, and volume patterns across contracts.
That's Kairos. One book across Kalshi, Polymarket, and Predict.fun. Real-time data, advanced order types, low-latency execution. The power of an institutional trading desk, on your laptop.
A prediction market is where you trade the future. Trade it like a professional. See you in the order books.
Ready to trade one? We compared the venues on fees, liquidity and regulation in the best prediction market apps roundup.