Education

    How Prediction Markets Work: Contracts, Prices, Payouts, and Risks in 2026

    A beginner-friendly guide to how prediction markets work, how prices map to probabilities, how contracts settle, and how Kalshi and Polymarket differ in 2026.

    By PredictionMarkets.usSunday, March 8, 20268 min read
    How Prediction Markets Work: Contracts, Prices, Payouts, and Risks in 2026

    Published: March 24, 2026 | Category: Education | Read time: 8 min

    Introduction

    Prediction markets look confusing until you strip away the jargon. Underneath, the core mechanic is dead simple: traders buy and sell contracts tied to future events, and those contract prices act like live probability estimates. If a contract pays $1 when an event happens and it trades at $0.63, the market is roughly saying that event has a 63% chance.

    That basic structure is now showing up across major platforms, but the details matter. Kalshi operates a CFTC-regulated designated contract market in the U.S., while Polymarket now has both its offshore exchange and a U.S. venue through QCX LLC (d/b/a Polymarket US). Those platforms also differ on who can use them, how they charge fees, and which market categories they list. Sources: CFTC ANPRM, Mar. 16, 2026, CRS, Mar. 20, 2026, Polymarket US fee schedule.

    If you just want the plain-English version, here it is: you are trading on a question about the future, prices move as new information arrives, and the winning side settles at $1 while the losing side settles at $0.

    What a Prediction Market Actually Is

    The Commodity Futures Trading Commission’s 2026 prediction-markets rulemaking notice describes prediction markets as venues where participants buy and sell contracts based on whether stated events occur. The notice also explains that these contracts can fall under the Commodity Exchange Act as swaps or futures contracts, depending on structure. Source: Federal Register, Mar. 16, 2026.

    The Congressional Research Service uses even plainer language: prediction markets are exchange platforms offering event contracts with a binary payoff tied to whether a specific event happens. Users buy and sell those contracts continuously, and prices can provide information about the market-implied probability of the event. Source: CRS, Mar. 20, 2026.

    That’s why most beginner examples use yes-or-no questions:

    • Will the Fed cut rates in June?
    • Will a named storm form before a date?
    • Will Team A win a championship?
    • Will Candidate X win an election?

    Some markets are binary. Others are range or multi-outcome markets. But the core idea stays the same: traders put money behind views on future outcomes, and the market price updates in real time.

    How Contract Prices Turn Into Probabilities

    A standard binary contract usually settles at $1 if the outcome happens and $0 if it does not. Because of that fixed payout, the trading price is commonly read as an implied probability.

    Congressional Research Service language makes this explicit: if a “Yes” contract pays $1 and trades at $0.60, the market is commonly viewed as implying a 60% chance that the event will occur. Source: CRS Legal Sidebar, Mar. 18, 2026.

    Kalshi’s own educational materials say event contracts trade between $0.01 and $0.99, and if you pay $0.60 for a YES contract, someone on the other side paid $0.40 for the NO contract. If the market resolves to YES, the YES side receives the full $1. Source: Kalshi, “Working with Event Contracts”.

    A few quick examples:

    • Buy YES at $0.25 → market implies roughly 25% odds
    • Buy YES at $0.50 → market implies roughly 50% odds
    • Buy YES at $0.82 → market implies roughly 82% odds

    That does not mean the market is guaranteed to be right. It means that is the consensus price at that moment, given all the information traders have already absorbed.

    How You Make or Lose Money

    The math is simple.

    If you buy a YES contract at $0.38:

    • If the event happens, the contract settles at $1.00
    • Your gross gain is $0.62 per contract, minus fees
    • If the event does not happen, the contract settles at $0.00
    • Your loss is the $0.38 you paid, plus any fees

    The same logic applies in reverse for NO positions.

    Kalshi’s educational guide also stresses a beginner-friendly point that matters: traders can close positions before settlement, rather than holding until the final resolution. Source: Kalshi beginner guide.

    So there are really two ways to win:

    1. Hold to resolution and be right
    2. Sell earlier if the market moves in your favor before the event resolves

    That second part is why these platforms feel more like markets than one-shot bets. Prices update continuously as news breaks, forecasts change, and traders reposition.

    How Markets Get Created and Settled

    A prediction market is only as good as its settlement rules. If the answer to the market question is fuzzy, the whole contract becomes dangerous.

    The CFTC’s March 2026 advisory emphasizes that exchanges listing event contracts must make sure contracts are not readily susceptible to manipulation and must conduct real-time monitoring. Sources: CRS, Mar. 20, 2026, National Law Review summary of March 2026 CFTC advisory.

    Kalshi’s market FAQ says markets settle after the official outcome is confirmed and the market is finalized, often within a few hours, but longer if the exchange is waiting on official data from a source agency. It also tells users to check the market’s specific Rules and Important Information sections. Source: Kalshi Market FAQs.

    Polymarket’s category pages say markets resolve based on trusted or official data sources and direct users to the Rules section on each market page for exact criteria. Sources: Polymarket Climate, Polymarket Climate & Weather.

    This is the part beginners skip and then regret skipping. Before trading any market, read:

    • the exact wording of the question
    • the listed source for final resolution
    • the cut-off time or determination date
    • any edge-case language

    If you do not understand how a market resolves, you do not understand the trade.

    For a deeper settlement example, see our guide on how weather prediction markets resolve.

    Why Prices Move All Day

    Prices move because new information changes the market’s collective view. Economic releases, injuries, weather models, polling changes, court rulings, and earnings guidance can all shift odds.

    The Federal Register notice describes prediction markets as information aggregation vehicles because prices reflect participants’ aggregate beliefs about whether events will occur. Source: Federal Register, Mar. 16, 2026.

    That matters because prediction markets are not just scoreboards. They are living order books. A trader with new information or a stronger model can move price, and a trader who disagrees can take the other side.

    This is also why liquid markets tend to be more useful than thin ones. In a liquid market, price reflects many competing views. In an illiquid market, one aggressive order can make the market look more certain than it really is.

    Kalshi vs. Polymarket: The Important Beginner Difference

    The beginner mistake is assuming every prediction market works the same way legally and operationally. They do not.

    According to CRS, Kalshi runs a CFTC-regulated exchange, while Polymarket’s largest exchange remains offshore and claims to block U.S. users, even though Polymarket also now has a U.S. structure through QCX LLC (d/b/a Polymarket US). Source: CRS, Mar. 20, 2026.

    Fee structures differ too.

    For Polymarket US, the posted U.S. schedule says:

    • taker fees are 30 basis points (0.30%) on total contract premium
    • maker rebates are 20 basis points (0.20%) on total contract premium

    Source: Polymarket US fee schedule.

    For the broader Polymarket docs, current live taker fees in March 2026 apply only to certain categories, with fee curves varying by category and peaking around the middle of the probability range. Source: Polymarket fees documentation.

    Kalshi’s beginner and FAQ materials describe small transaction fees and fully cash-collateralized trading, meaning users cannot lose more than the cash committed to their trades. Sources: Kalshi beginner guide, Kalshi event contracts explainer.

    If you’re comparing platforms, our broader tracker is here: Prediction Markets.

    The Biggest Risks Beginners Miss

    1. Confusing probability with certainty

    A 70% market still loses 30% of the time. If you treat high-probability prices like guarantees, the market will eventually punch you in the face.

    2. Ignoring resolution rules

    The market resolves off the rulebook, not your vibes. Official source timing, revisions, and edge cases all matter.

    3. Trading illiquid markets

    Wide spreads and thin books can make entry and exit much worse than the headline price suggests.

    4. Forgetting fees

    The headline price is not your full cost. Fees can meaningfully change outcomes, especially for active traders or markets near 50%.

    5. Treating it like entertainment instead of a market

    CRS notes that prediction markets and legal sports gambling use different structures: prediction markets operate on continuous quote-based pricing, while sportsbooks set and adjust odds as the house. Source: CRS, Mar. 20, 2026. That distinction matters, but it does not magically remove risk.

    Are Prediction Markets Accurate?

    Sometimes impressively so. But “accurate” needs context. Markets can be excellent at aggregating fast-moving public information, and they can also be wrong, manipulated, or slow in thin categories.

    The American Meteorological Society published a 2024 study on expert prediction markets for climate-related variables and found the market-generated forecasts were consistent with good reliability given the sample size studied. Source: Bulletin of the American Meteorological Society, Oct. 2024.

    That does not mean every market price is gospel. It means prediction markets can be a useful information tool when there is enough participation, enough clarity, and enough incentive for informed traders to show up.

    Final Take

    Prediction markets work because they turn disagreement into price. One side thinks an event is underpriced, the other thinks it is overpriced, and the resulting trade creates a live probability signal.

    That is the elegant part. The dangerous part is that beginners see the clean interface and miss the machinery underneath: settlement rules, liquidity, fees, legal structure, and information shocks all matter.

    If you remember only four things, remember these:

    • a binary contract usually settles at $1 or $0
    • price is commonly read as an implied probability
    • you can often exit before settlement
    • the rules page is part of the trade, not optional reading

    If you want to go deeper next, read our guides on how weather prediction markets resolve and prediction markets vs. sports betting.

    Sources & Verification

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