Get early access

Markets5 min read

What is a prediction market? A clear guide for 2026

A prediction market is an exchange where people trade on future events, and the price works as a probability. How it works, who runs them, why they matter.

By Kristian FagerlieFounder & CEO, Sikt Intelligence

A prediction market is an exchange where people buy and sell contracts on the outcome of future events, such as an election, a central bank decision or a product launch. Each contract pays out if the event happens. Because of that, its price works as a probability: a contract trading at 30 cents on a $1 payout means the market sees roughly a 30% chance.

In 2026 prediction markets went mainstream. Search interest in Kalshi alone rose by over 1,500% in a year (Rising Trends). This guide explains what they are, how they differ from betting and polls, and why forecasters take them seriously.

The idea in one example

Take the question "Will the Democrats win the House in 2026?"

  • A Yes contract pays $1 if they do, and $0 if they don't.
  • If Yes trades at 91¢, the market is saying: about a 91% chance.
  • If you think the real chance is higher, you buy Yes. If you think it is lower, you sell or buy No.

Every trade is a small bet on whether the price is too high or too low. Together, thousands of them pull the price toward what the best-informed traders believe. You can see this question, with live prices from two markets, on our 2026 midterm odds page.

For the full mechanics of order books, Yes and No contracts and settlement, see how prediction markets work.

Why the price is a probability

A contract that pays $1 in one outcome and nothing in the other is worth, to a rational trader, roughly the probability of that outcome times $1. If a price drifts away from the true odds, someone who knows better can profit by trading it back. That incentive is what turns a market into a forecast.

In practice the price is an approximation, bent by fees, the gap between buy and sell prices, and a known tendency to overprice long shots (the favorite-longshot bias). We explain how to read it precisely in prediction market odds, explained.

A short history

  • 1988: the University of Iowa opens the Iowa Electronic Markets, small real-money markets on US elections run for research. Over five presidential elections, their prices were closer to the final result than polls 74% of the time (Berg, Nelson and Rietz, 2008).
  • 2004: economists Justin Wolfers and Eric Zitzewitz review the evidence and find that market forecasts are typically fairly accurate (Journal of Economic Perspectives).
  • 2008: 22 prominent economists, including four Nobel laureates in economics, publish "The Promise of Prediction Markets" (as described in Bürgi, Deng and Whelan).
  • 2020: Kalshi becomes the first US exchange approved by the Commodity Futures Trading Commission (CFTC) to trade event contracts (CFTC). Polymarket, a crypto-based market, launches the same year.
  • 2024: around $3.7 billion is wagered on the US presidential election on Polymarket alone (Cutting et al., Vanderbilt).
  • 2026: prediction markets become one of the year's biggest investing trends, and courts and regulators race to set the rules.

Four kinds of prediction platforms

TypeExamplesMoneyNotes
Regulated exchangesKalshiReal money (dollars)CFTC-regulated in the US
Crypto-based marketsPolymarketReal money (stablecoins)Global; US access through a regulated affiliate since 2025
Play-money marketsManifoldPlay moneyAnyone can create questions
Forecasting platformsMetaculus, Good Judgment OpenNo tradingForecasters submit probabilities and are scored

Only the first two are markets in the strict sense, with prices set by trading. Forecasting platforms produce probabilities without betting, and their best participants, the superforecasters, are the benchmark AI forecasters are measured against.

What people use prediction markets for

  • Following the odds. Journalists, analysts and the curious read prices as a live forecast of elections, rates and world events.
  • Hedging. A business exposed to a rate decision or an election can offset some of that risk.
  • Forecasting inside companies. Some firms run internal markets to forecast sales or project deadlines.
  • Speculating. Many traders simply bet on what they think will happen. Much of the volume on the largest platforms is on sports.

Prediction markets vs. betting vs. polls

  • Versus sports betting: a sportsbook sets the odds and takes the other side of your bet. A prediction market matches you with other traders. We cover the difference in event contracts, explained.
  • Versus polls: a poll measures what people think today. A market prices what will happen, and traders can use polls as one input among many. See prediction markets vs. polls.

Are they accurate?

Often, and sometimes impressively, but not everywhere. Markets do well on liquid, high-profile questions, less well on thin markets and long shots, and they can be confidently wrong, as on Brexit in 2016. The evidence is in how accurate are prediction markets?

How Sikt fits in

Sikt Intelligence is building an AI superforecaster: AI that researches a question and gives its own calibrated probability. We show it next to the market price, because when the two disagree, the gap is the signal. Explore live market odds on the biggest events on our odds page. Nothing here is financial advice.

Key takeaways

  • A prediction market is an exchange for contracts on future events; each contract pays $1 if the event happens.
  • The price works as a probability: 30¢ means roughly a 30% chance.
  • They date back to the Iowa Electronic Markets in 1988; Kalshi and Polymarket brought them mainstream.
  • They are often accurate on big, liquid questions, and weaker on thin markets and long shots.
  • Read market prices alongside evidence-based forecasts, not instead of them.

FAQ

What is a prediction market in simple terms?

A place where people trade on whether future events will happen. A contract pays $1 if the event happens, so its price in cents is roughly the market's probability in percent.

Is a prediction market the same as gambling?

Legally and structurally it is different: in the US, regulated prediction markets are overseen by the CFTC as exchanges for event contracts, and traders trade against each other rather than against a bookmaker. Whether some contracts, especially on sports, count as gambling under state law is being decided in the courts in 2026.

What are the biggest prediction markets?

Kalshi and Polymarket are the largest in 2026. Kalshi is a CFTC-regulated US exchange; Polymarket is a global, crypto-based market with a regulated US affiliate.

Sources

Keep reading