A prediction market is a place where people buy and sell shares in the outcome of a future event: who wins an election, whether the Fed cuts rates, which team lifts a trophy. Each share pays out $1 if the outcome happens and nothing if it doesn’t. Because of that, the price of a share is the crowd’s live estimate of the chance. A share trading at 30¢ means the market thinks the outcome is about 30% likely.
How a prediction market works
Take a simple question: “Will the Fed cut interest rates in December?” The market lists two outcomes, Yes and No.
- You pick a side. If Yes trades at 40¢ and you think a cut is more likely than 40%, you buy Yes shares.
- Someone takes the other side. Your order matches with a trader who thinks Yes is overpriced. The two prices always add up to about $1, so their No shares cost about 60¢.
- The price moves with news. If a Fed official hints at a cut tomorrow, buyers rush in and Yes might jump to 65¢. You can sell then and lock in the gain, or hold.
- The market resolves. When the decision is announced, the winning shares pay $1 each and the losing ones pay nothing.
There’s no bookmaker setting the odds. The price is simply the last level at which a buyer and a seller agreed to trade.
Reading prices as probabilities
| Share price | Implied chance | Pay $100, win if right | How to read it |
|---|---|---|---|
| 90¢ | 90% | $111 | Strong favourite |
| 60¢ | 60% | $167 | Leaning yes |
| 50¢ | 50% | $200 | Coin flip |
| 25¢ | 25% | $400 | Underdog |
| 5¢ | 5% | $2,000 | Long shot |
To translate these into sportsbook odds, use the odds converter.
Why prediction markets are often accurate
Markets aren’t magic, but they have three things going for them:
- Money on the line. People are careful when being wrong costs them. Talk is cheap; trades aren’t.
- Constant updating. A poll is a snapshot. A market reprices within minutes of news.
- Rewards for knowing better. If the price is off, whoever spots it profits by correcting it. That pulls in people with real expertise.
Research on election and economic markets has found their prices are often at least as well calibrated as polls and expert forecasts, especially close to the event. They do get things wrong: thin markets can be moved by a single big trader, and crowds can share the same blind spot. Treat a price as a well-informed estimate, not a guarantee.
What you can trade
- Politics: elections, party control of Congress, leadership races, policy deadlines like government shutdowns.
- Economics: Fed decisions, inflation and jobs figures, recession calls.
- Sports: games, championships, MVP and award races.
- Crypto: price levels for Bitcoin, Ethereum, Solana and others by a set date.
- Culture and tech: awards, box office, product launches, AI milestones.
Here’s what’s trading most right now:
Live now
Latest price for “Yes”, shown as an implied chance. Polymarket volume in USD, Kalshi in contracts. Updated 2 min ago.
Prediction markets vs betting
From the outside it looks similar: you put money on an outcome. The mechanics differ.
| Prediction market | Sportsbook | |
|---|---|---|
| Who sets the price | Traders, by buying and selling | The bookmaker |
| Who you trade against | Other users | The house |
| How it makes money | Trading fees and spread | Margin built into the odds |
| Cash out early | Sell your shares any time at the market price | Only if the book offers a cash-out |
| Winning accounts | Welcome: they add liquidity | Often limited |
In the US, regulated prediction markets like Kalshi are overseen by the CFTC as financial exchanges rather than by state gambling regulators. Some states dispute that, especially for sports, and the question is being fought out in court.
The main platforms
Polymarket is the largest by volume worldwide. Its main exchange settles in pUSD, a USDC-backed dollar token, on the Polygon blockchain and is not open to US residents, who use the separate Polymarket US app. Kalshi is a CFTC-regulated US exchange that works in dollars and is also available in many other countries. Our Kalshi vs Polymarket comparison covers fees, deposits and availability in detail.
Risks to know before you start
- You can lose everything you put into a position. A share bought at 80¢ goes to zero if you’re wrong.
- Fees and spreads add up, especially on cheap long shots and in thin markets.
- Resolution rules matter. Read exactly how and when a market settles; small wording differences decide payouts.
- Legal status depends on where you live. Many countries block prediction markets, and US states differ. Check before you sign up and never use a VPN to get around restrictions.
- Taxes. Winnings are usually taxable. Keep records.