What Is a Prediction Market? A Beginner’s Guide to How Event Trading Works

A prediction market is a marketplace where you buy and sell contracts tied to the outcome of a future event. Each contract settles at $1 if the event happens and $0 if it does not — so the price you pay, somewhere between a penny and 99 cents, is really the market’s live estimate of how likely that outcome is.

Unlike sports betting, where the operator sets the odds and takes the other side of your wager, prediction markets work like exchanges: buyers and sellers trade directly with one another, and prices move throughout the day as new information lands. If you are weighing where to actually trade, our ranked prediction-market reviews break down every major US platform.

Prediction markets at a glance

What is an event contract?

An event contract is a financial contract linked to a single measurable outcome. Instead of investing in a company or betting against a sportsbook, you take a position on whether a clearly defined event will occur before a set deadline.

For example, a market might ask:

• Will the Federal Reserve cut interest rates at its September meeting?
• Will Bitcoin close above $150,000 by December 31, 2026?
• Will the New York Yankees win tonight’s game?
• Will US CPI inflation exceed 3.0% this month?

Every contract has a clearly written question, an expiration date, an official settlement source, and predefined rules explaining exactly how the outcome is determined. On regulated US exchanges such as Kalshi, contracts generally settle at $1.00 if the prediction is correct and $0.00 if it is not.

How does a prediction market work?

Prediction markets work much like stock exchanges. Instead of buying shares of Apple or Microsoft, you buy contracts representing the probability of an event occurring. Here is a simple example.

Market: Will Bitcoin trade above $150,000 before December 31, 2026?

If you believe Bitcoin has a better chance than the market suggests, you could buy 100 YES contracts for 100 × $0.42 = $42.

(Trading fees are excluded from this simplified example.) Because the contract traded at 42 cents, the market is effectively pricing the probability at roughly 42% — and that probability is not fixed. It changes continuously as traders buy and sell.

Why are contracts priced between $0.01 and $0.99?

Most event contracts have a maximum value of $1, so the price naturally represents the market’s implied probability.

A contract trading at 73 cents means traders collectively estimate roughly a 73% chance the event will occur. That does not mean it is guaranteed — it simply reflects where buyers and sellers currently agree to trade. Prices can move sharply after economic reports, earnings, breaking news, injuries, debates, weather forecasts and official government releases.

A real example: the Federal Reserve interest-rate market

Suppose Kalshi lists the market: Will the Federal Reserve cut interest rates at its next meeting? with YES at $0.34 and NO at $0.66. You believe inflation has fallen faster than expected and that the market is underestimating the chance of a cut, so you buy 200 YES contracts for 200 × $0.34 = $68.

• If the Fed cuts rates, your payout is 200 × $1 = $200, a gross profit of $132.
• If the Fed leaves rates unchanged, the contracts expire worthless and you lose your $68.

This is why prediction markets reward identifying situations where you believe the market has mispriced an event — not simply predicting what you think will happen. You can see live versions of markets like this in our markets hub.

Who decides the price?

Unlike a sportsbook, prediction-market operators generally do not set prices — supply and demand do. If more traders believe an event is likely, the price of YES contracts rises; if confidence fades, it falls.

Imagine a hurricane is forecast to make landfall. Initially YES trades at 18¢. The next morning, forecasts become more certain and YES rises to 63¢. Nothing has actually happened yet — only the market’s expectations have changed. That ability to react instantly to new information is one of the defining features of prediction markets.

Why do people use prediction markets?

Speculation

Most users are trying to profit by identifying contracts they believe are priced incorrectly.

Hedging

Businesses and investors may use prediction markets to offset real-world risks — an airline watching hurricane markets, an energy company following weather forecasts, or an investor tracking inflation contracts.

Forecasting

Researchers have studied prediction markets for decades because they aggregate information from many independent participants. Rather than relying on a single expert, prices incorporate the collective views of thousands of traders. Economists including Justin Wolfers and Eric Zitzewitz have found that prediction markets often produce well-calibrated forecasts for many measurable events, though accuracy varies by market and liquidity.

Prediction markets vs sports betting

Although prediction markets and sportsbooks can cover similar events, they operate differently.

This distinction matters in the US, where sports-related event contracts have prompted ongoing legal and regulatory debate. We keep the current state of play in one place in our legality guide.

Common misconceptions

“Prediction markets guarantee accurate forecasts.” No. Prices represent the market’s current consensus, not certainty. Markets can be wrong.

“You have to hold until settlement.” Not necessarily. With enough liquidity, you can often sell your position before the event resolves.

“A 70¢ contract guarantees a 70% chance.” No. It reflects the market’s current pricing, and unexpected news can move it quickly.

“Prediction markets are the same as gambling.” Not exactly. Some platforms operate under financial-market regulation as event-contract exchanges, while traditional sportsbooks are regulated under gambling laws. The legal treatment depends on the platform, jurisdiction and contract type.

Key takeaways

• Prediction markets let you trade contracts tied to future events.
• Most contracts settle at $1 for a correct outcome and $0 for an incorrect one.
• Contract prices roughly correspond to the market’s estimated probability.
• Prices are set by buyers and sellers, not a bookmaker.
• You can often close a position before settlement if there is liquidity.
• Regulated US platforms include Kalshi and ForecastEx (via Interactive Brokers).

Frequently asked questions

Are prediction markets legal in the United States?

Some are. Platforms such as Kalshi operate as CFTC-regulated event-contract exchanges, while the legality of certain market categories continues to evolve through regulatory and legal proceedings. See our legality guide for the current picture.

Can you lose more than you invest?

For standard long Yes or No contracts, your maximum loss is generally the amount you paid for the contract, plus any applicable fees.

What is the minimum amount needed to start?

It depends on the platform and contract price. Since many contracts trade for less than $1 each, you can often begin with a relatively small amount, though account funding minimums vary.

Are prediction markets more accurate than polls?

Sometimes. Because they incorporate continuously updated information from many participants, prediction markets have at times matched or outperformed traditional polls. They are not infallible, though, and can misprice events — particularly when liquidity is thin or news breaks suddenly.