How Do Prediction Markets Actually Work?
Updated September 29, 2026
Updated September 29, 2026
Prediction markets turn future events into tradeable contracts. Instead of placing a conventional sportsbook bet, you take a position on whether a particular outcome will happen.
Most prediction markets make this easy to understand with Yes and No contracts. A contract might ask whether the Federal Reserve will cut interest rates, whether a candidate will win an election or whether a team will win a championship. If the contract resolves Yes, a standard binary contract generally settles at $1. If it resolves No, the Yes side settles at $0.
What happens between those two points is what makes prediction markets interesting.
Prices can move continuously as traders react to new information, changing expectations and activity from other participants. You can often sell a position before the final outcome is known rather than holding it all the way to settlement.
The basic mechanics are easy to understand. Trading well is considerably harder. You need to understand what the contract actually says, what the current price implies, how liquid the market is and what costs you will face when entering or leaving a position.
A prediction market starts with a question about a future event. Traders can take positions based on whether they believe that event will happen, and the contract price changes as buyers and sellers react to new information.
If a Yes contract is trading at 40 cents, you can broadly interpret that as the market pricing the outcome around a 40% implied probability. If traders become more confident that the outcome will occur, the price may rise. If expectations weaken, it may fall.
When the market finally resolves, winning contracts generally settle at $1 and losing contracts at $0.
You also do not necessarily have to wait for settlement. On an active market, you can often sell your position earlier, allowing you to take a profit, reduce a loss or simply change your exposure as new information emerges.
If you are completely new to the category, our main prediction markets guide provides a broader overview before getting into the mechanics below.
The basic process is straightforward.
First, a market is created around a specific future event. That could be an election, interest-rate decision, sporting event, economic report or almost any other outcome that can be objectively resolved.
The contract then establishes the rules. Those rules explain exactly what counts as Yes or No, which source will be used to determine the outcome and when the market will settle.
Traders can then buy and sell positions. In a traditional binary market, the two sides are Yes and No, with prices typically expressed somewhere between $0 and $1.
Those prices continue moving while the market is open. News, economic data, polling, injuries, weather, liquidity and trader sentiment can all change what participants are willing to pay.
Finally, once the outcome is officially determined under the contract rules, the market settles. Winning contracts generally pay $1 each while losing contracts settle at $0.
That is the entire mechanical process. The difficult part is deciding whether the price you are paying offers value.
Every prediction market starts with a question that can eventually be answered.
It might ask whether a presidential candidate will win an election, whether the Federal Reserve will cut rates at its next meeting, whether an NHL team will win the Stanley Cup or whether Bitcoin will trade above a certain level before a specified date.
The subject matter can vary enormously, but a useful prediction market needs a clearly defined outcome and a way to determine when that outcome has occurred.
This is also where platforms begin to differentiate themselves. Some have particularly deep political markets, while others focus heavily on sports, economics, financial markets, crypto or popular culture.
Our guide to the best prediction market platforms looks more closely at those differences.
The title tells you what a market is about. The rules tell you what you actually own.
That distinction is extremely important.
A market titled “Will Candidate A win the election?” sounds simple, but the settlement rules might specify certification by election officials, an Electoral College result or another predefined source. Two contracts that appear to ask almost the same question can therefore resolve differently.
The same issue appears in sports, financial markets and breaking news. A contract asking whether a player scores a goal may have specific rules covering postponements, abandoned games or stat corrections. A Federal Reserve contract may depend on a particular published target range rather than how journalists describe the decision.
Before taking a position, you should therefore understand exactly what must happen for the contract to resolve Yes.
This is particularly important in political markets, where apparently minor differences in wording can completely change the meaning of a contract. Our US election prediction markets page provides a good example of how similar political questions can represent different outcomes.
Most consumer prediction markets use relatively simple binary contracts.
If you believe an event will happen, you can take the Yes side. If you believe it will not happen, you can take the No side.
Suppose a Yes contract costs 35 cents. Buying 100 contracts would cost approximately $35 before fees. If the market ultimately resolves Yes and each winning contract settles at $1, those contracts would be worth $100 at settlement.
Your gross profit would therefore be $65 before trading costs.
If the event does not occur, the contracts settle at $0 and the original $35 position is lost.
The math is simple, but the important part is the relationship between price and probability. Paying 35 cents only makes sense if you believe the outcome is worth more than the price you are paying after accounting for fees, spread and uncertainty.
A prediction market is not frozen after you enter.
The price continues changing as other participants react to whatever is happening in the real world. In politics that might include polls, endorsements, debates or legal decisions. In sports it might be an injury, lineup change, trade or weather forecast. Economic markets can move rapidly after inflation reports, employment data or central-bank comments.
Sometimes the move has little to do with a major news event. A large order can move the price in a relatively thin market, while increased liquidity can narrow the gap between buyers and sellers.
This is one of the clearest differences between a prediction-market position and a conventional sportsbook wager.
At a sportsbook, the odds available to new bettors can change after you place your wager, but the price you accepted generally remains fixed. In a prediction market, your contract itself continues to have a changing market value.
That gives you the option to keep holding it or attempt to sell it before the event is resolved.
Our full guide to prediction markets vs sports betting goes deeper into the differences between contract prices, sportsbook odds, liquidity, fees and early exits.
Eventually the underlying question is answered.
The platform applies the contract's settlement rules and uses the specified source to determine the final outcome. On Kalshi, for example, the source and determination criteria are included in each contract's terms, and settlement can sometimes take additional time while the exchange waits for official information.
Once the result is finalized, winning contracts are paid according to the contract terms.
For a typical binary $1 contract, that means the winning side settles at $1 and the losing side at $0.
By that stage, however, many traders may already have closed their positions. A prediction market does not require every participant to hold until the final outcome.
One reason prediction markets are intuitive is that their prices can be read approximately as probabilities.
A Yes contract trading around 20 cents suggests the market is pricing the outcome near a 20% implied probability. A 50-cent contract represents something close to a coin flip, while an 80-cent contract suggests traders collectively view the outcome as considerably more likely than not.
The word approximately matters.
A market price is not a scientific measurement of the true probability. It is simply the price at which participants are currently willing to trade.
That price can be influenced by liquidity, the bid-ask spread, trading fees, large individual orders, market sentiment and imperfect information.
A contract displaying 60 cents should therefore be read as the market currently pricing the event somewhere around 60%, rather than proof that the real-world probability is exactly 60%.
For traders, this distinction is important. The question is not only whether you believe something will happen, but whether the price being offered appropriately reflects that possibility.
Consider a market asking whether Team A will win a championship.
The Yes contract is trading at 35 cents and you buy 100 contracts. Your initial position costs $35 before fees.
If Team A eventually wins and the contract settles at $1, the position is worth $100. Your gross profit is $65.
If Team A does not win, the contracts settle at $0 and you lose the $35 you paid.
There is another possibility, though.
Suppose Team A wins its next playoff game and the market reprices its championship chances. Your Yes contract is now trading around 55 cents.
You could continue holding and hope Team A ultimately wins, or you could attempt to sell your 100 contracts for around $55 and realize the increase in value before the championship is decided.
That ability to trade the position before settlement is one of the defining characteristics of prediction markets.
The actual amount you receive will depend on available buyers, spread, fees and execution price, so the headline contract price does not guarantee that every contract can be sold at exactly that level.
Prediction markets typically use some form of marketplace where participants submit orders at prices they are willing to accept.
An order book shows the prices and quantities currently available. Kalshi, for example, displays resting bids and asks along with the number of contracts available at each price.
A market order prioritizes getting the trade filled quickly using available prices. That can be convenient, but it also creates the possibility of paying more than expected in a fast-moving or thin market.
A limit order takes the opposite approach. You specify the highest price you are willing to pay when buying, or the lowest price you are willing to accept when selling. If another participant is willing to trade at that level, the order can fill. If not, it remains unfilled.
Neither approach is inherently correct. The trade-off is essentially execution certainty versus price control.
Liquidity determines how easily you can actually trade at or near the displayed price.
In a liquid market, many participants are submitting orders and there may be substantial volume available around the current price. This generally produces narrower bid-ask spreads and makes larger trades easier to execute without moving the market dramatically.
A thin market can be very different.
You might see a contract priced around 42 cents, but only a small number of contracts may actually be available at that price. If you try to buy a much larger quantity, your order could begin filling at progressively higher levels.
The same problem can appear when you want to sell.
That difference between the expected price and the actual average execution price is commonly referred to as slippage.
Experienced traders therefore look beyond the headline probability. Spread, volume and order-book depth all help determine whether the displayed price is realistically available for the position size they want.
Our PredictIt liquidity guide explains the concept in more detail.
Usually, yes, provided there is enough liquidity and the market remains open for trading.
That gives traders several options as circumstances change. You can realize a gain if the price moves in your favor, reduce a losing position after new information changes your view or simply close the trade because you no longer want the exposure.
The catch is that an exit requires someone willing to take the other side at an acceptable price.
A contract might theoretically be worth 60 cents based on the latest trade, but that does not necessarily mean you can immediately sell a large position at 60 cents.
This is why liquidity matters just as much on the way out as it did when entering the trade.
Prediction-market business models differ.
Some exchanges primarily charge transaction fees. Kalshi, for example, says its exchange earns revenue from transaction fees rather than taking a financial position on whether an event occurs.
Other platforms may have different fee structures or associated costs.
From a trader's perspective, the important thing is to look beyond the advertised contract price. Trading fees, bid-ask spreads, deposit or withdrawal costs and slippage can all affect the actual return from a position.
Being correct about the outcome is therefore only part of the equation. You also need to enter at a price where your potential advantage is large enough to survive the costs of trading.
Our Kalshi fees guide covers those costs in more detail.
Prices change because the willingness of participants to buy and sell changes.
New information is usually the easiest reason to identify. A surprise inflation report can quickly move a Federal Reserve market. An injury can reprice a sports contract. A new poll can change an election market within minutes.
Time matters as well.
An outcome trading at 60% with six months remaining contains far more opportunity for circumstances to change than an outcome at 60% with only six minutes remaining. As the resolution date approaches, uncertainty can disappear quickly and prices tend to move toward either $1 or $0.
Liquidity can also produce movement without any meaningful change in the real-world probability. One large trader entering a thin order book may be enough to push the displayed price significantly higher or lower.
That is why a sudden price movement is a signal worth investigating, not automatic proof that something important has happened.
Prediction markets and sportsbooks both involve risking money on uncertain events, but the underlying mechanics are different.
A sportsbook publishes odds and accepts bets at those prices. The operator builds a margin into its markets, commonly called the vig, and your wager normally remains at the price you accepted even if the sportsbook changes its odds for new customers later.
Prediction markets instead allow positions to trade while the market remains open. Prices change as participants submit and accept orders, and users can often exit before final settlement if sufficient liquidity exists.
Category | Prediction Markets | Sports Betting |
|---|---|---|
Core mechanic | Trade contracts tied to future events | Place wagers at sportsbook odds |
Price format | Usually expressed between $0 and $1 | American, decimal or fractional odds |
Pricing | Driven by market trading | Set and managed by sportsbook |
Position value | Can continue changing | Accepted wager generally remains fixed |
Early exit | Usually possible if liquidity exists | Cash-out may be available |
Main costs | Fees, spread and slippage | Sportsbook margin/vig |
The categories increasingly overlap, particularly in sports. Prediction markets now offer event contracts tied to many of the same outcomes that appear at traditional sportsbooks, but the pricing, trading and regulatory structures remain different.
One of the easiest mistakes is treating a market price as certainty. A contract trading at 90 cents can still lose, just as a 10-cent contract can still win. Prices represent what the market is currently willing to pay, not guaranteed outcomes.
Another common mistake is concentrating entirely on which outcome will occur. Suppose you believe an event has a 60% chance of happening, but the Yes contract already costs 75 cents. You can ultimately be correct about the event and still have taken an unattractive position at the price available.
Fees and spreads are easy to overlook for the same reason. A small theoretical advantage can disappear once the actual cost of entering and leaving the market is included.
Settlement rules also deserve more attention than beginners often give them. Correctly forecasting what happens in the real world does not help if the contract you bought defines the outcome differently.
Finally, do not assume you will always be able to exit at the displayed price. Thin liquidity can make closing a position considerably more difficult than opening one.
The general mechanics are similar across the industry, but the details can vary considerably.
Kalshi operates as a CFTC-designated contract market in the United States. It uses an order-book structure and lists federally regulated event contracts across a growing number of categories.
Polymarket requires a more nuanced description than it did only a year ago. Its international product became known for crypto-based prediction markets and deep liquidity, particularly around politics, but Polymarket also now has a regulated US operation. QCX LLC, doing business as Polymarket US, is listed by the CFTC as a designated contract market.
PredictIt remains strongly associated with political prediction markets and is particularly useful for election and public-policy questions.
This growing variety is one reason it is worth comparing platforms on more than their headline market selection. Regulation, fees, liquidity, order mechanics, funding methods and geographic availability can all affect the actual experience.
There is no single answer that applies to every platform and every contract.
Several major US prediction-market platforms operate through CFTC-regulated entities. The CFTC has publicly maintained that federally registered derivatives exchanges fall under its jurisdiction, and in 2026 it began a broader rulemaking process focused specifically on prediction markets and event contracts.
At the same time, states have challenged sports event contracts under their own gambling laws.
That conflict became even more important in September 2026. On September 25, the Sixth Circuit Court of Appeals ruled that Ohio and Tennessee could apply their gambling laws to Kalshi's sports event contracts, rejecting Kalshi's argument in those cases that federal law prevented the states from doing so. Other federal courts have reached different conclusions, creating a split over where federal authority ends and state gambling regulation begins.
Polymarket is now involved in a similar dispute with New York. The state sued Polymarket in September 2026, while Polymarket responded with a federal case arguing that federal commodities regulation preempts state gambling enforcement.
The practical result is that users should not assume a prediction market or individual contract is available everywhere simply because the underlying exchange is federally regulated.
Platform, contract type and location all matter.
Our prediction markets legal status guide looks at the issue in greater detail.
Prediction markets are not particularly difficult to understand.
A future event becomes a contract. You take a position, the price changes while the market is open and you either sell before resolution or hold until the final outcome determines the settlement value.
The difficult part is everything surrounding that process.
You have to decide whether the market price makes sense, understand exactly how the contract resolves, account for fees and liquidity and determine how much new information should change the probability.
That is what separates simply predicting an outcome from actually trading a prediction market.
You can be right about what eventually happens and still make a poor trade because you paid too much. You can also be wrong about the final result and still make money if you sell a position after the price moves in your favor.
The outcome matters, but so does the price.
Prediction markets allow you to trade contracts linked to future events. Binary markets typically offer Yes and No positions. Prices change while trading remains open, and winning contracts generally settle at $1 while losing contracts settle at $0.
A contract trading around 50 cents suggests that the market is currently pricing the outcome at roughly a 50% implied probability. It should be treated as a market price rather than a precise measurement of the true probability.
Usually, yes, provided the market remains open and sufficient liquidity is available. Selling early allows you to realize a gain, reduce a loss or change your exposure before the underlying event is decided.
Many binary event contracts settle at $1 for the winning side and $0 for the losing side. Contract structures can differ, however, so users should always check the individual market rules.
They can be useful indicators because participants have financial incentives to incorporate information into the price, but they are not guaranteed to represent the true probability. Liquidity, spreads, sentiment, large trades and incomplete information can all influence prices.
Prices move as buyers and sellers change what they are willing to pay. News, polls, injuries, economic data, weather, changing expectations, liquidity and large individual trades can all affect a market.
No. Both involve uncertain outcomes, but their mechanics are different. Sportsbooks offer wagers at operator-set prices, while prediction markets generally allow participants to trade event contracts whose values can change until the market closes or resolves.
Some major prediction-market exchanges operate under CFTC regulation, but legal disputes continue over whether states can separately regulate certain contracts as gambling. Availability therefore depends on the platform, the market and the user's location.