What Are Prediction Markets?

If you have ever wondered "what are the real odds this happens?" — an election result, a rate cut, a team winning the title — a prediction market gives you a live, money-backed answer. Instead of a pundit's opinion, you get a price set by thousands of people putting real money on the line.

What is a prediction market?

A prediction market is an exchange where people trade contracts tied to the outcome of a future real-world event. Each contract pays a fixed amount — usually $1 — if the event happens, and $0 if it does not. You buy the "Yes" side if you think the event will occur, or the "No" side if you think it won't.

Because a winning contract is always worth exactly $1, the price you pay tells you everything. If a "Yes" contract costs 68¢, the market is saying there is about a 68% chance the event happens. Buy it, and you risk 68¢ to make 32¢ if you're right.

For the underlying definitions, see prediction market, event contract, and Yes/No shares in our glossary.

Price is probability

This is the single most important idea in prediction markets: the price is the probability. A contract that settles at $1 or $0 can only trade between those two values, so its price maps directly onto a percentage chance.

• A "Yes" price of 10¢ → the market thinks there's about a 10% chance.
• A "Yes" price of 50¢ → a genuine coin-flip.
• A "Yes" price of 92¢ → the market is 92% confident.

Yes and No always add up to $1. If "Yes" is 68¢, "No" is 32¢. We cover the details — and how to convert prices across platforms — in how to read and compare odds. The formal terms are implied probability and price as probability.

A worked example

Suppose a market asks "Will the Fed cut rates at the next meeting?" and the "Yes" contract trades at 40¢.

• You buy 100 "Yes" contracts for $40 total.
• If the Fed cuts, each contract settles at $1 — you receive $100, a $60 profit.
• If the Fed holds, the contracts settle at $0 and you lose your $40.

You don't have to wait until the event resolves, though. Prices move as news arrives, so you can sell your contracts early — for a profit if the price rose, or to cut a loss if it fell. Trading in and out before settlement is exactly how active traders operate.

Why crowd-sourced odds are often accurate

Prediction markets are a form of information aggregation. Anyone who thinks the price is wrong has a financial incentive to trade against it, which nudges the price toward reality. Because being wrong costs money and being right pays, the market rewards good information and punishes wishful thinking.

In practice, well-traded prediction markets have repeatedly matched or beaten opinion polls and expert panels for elections, economic releases, and other hard-to-forecast events. That's the "wisdom of the crowd" turned into a tradable number.

Where can you trade?

The major venues each work a little differently:

• Kalshi — a U.S. exchange regulated by the CFTC, settled in dollars.
• Polymarket — a large crypto-based market settled in USDC stablecoin.
• Predicta and other venues, each with their own event catalog and pricing.

Because the same event can trade at different prices on different platforms, a prediction market aggregator like MarketsPrediction lets you compare them side by side and find the best price. That's the whole point of line shopping.