If you have ever wondered “what are the odds this actually happens?” — a prediction market gives you a number, set not by a bookmaker or a pundit but by thousands of people putting money behind their opinions. Platforms such as Kalshi, Polymarket and FanDuel Predicts have turned that idea into a fast-growing corner of online trading, where elections, interest-rate decisions, sports results and even the weather all have a live price.
The short version
- What you trade
- Contracts on yes/no questions about future events
- What a price means
- A 64¢ price ≈ a 64% implied chance
- How it settles
- Winning side pays $1 per contract, losing side $0
- Who you trade against
- Other traders, not “the house”
- US oversight
- Regulated by the CFTC as event contracts
How a single contract works
Most markets are binary: there are two outcomes, Yes and No, and exactly one will be true when the event resolves. Take a market like “Will the Federal Reserve cut interest rates at its next meeting?”
- A Yes share trades somewhere between 1¢ and 99¢. Say it’s 64¢.
- The matching No share always costs the rest of the dollar — here, 36¢.
- When the meeting happens, the contract resolves. The winning side is worth $1; the losing side is worth $0.
So if you buy Yes at 64¢ and the Fed cuts, each share you hold is now worth a dollar — a profit of 36¢ on every 64¢ risked. If they hold rates, your Yes shares expire worthless. You can also sell before resolution if the price moves in your favour, locking in a gain without waiting for the outcome. Our profit calculator turns any price and stake into exact payout and ROI.
Why the price is a probability
This is the idea that makes prediction markets interesting. Because a winning contract always pays exactly $1, its price has a natural reading: it is the share of a dollar traders are collectively willing to pay for the chance of winning the whole dollar. Pay 64¢ for something that returns $1, and you only profit over time if it happens more than 64% of the time. The price, in other words, settles at the crowd’s best guess of the probability.
What keeps that guess honest is money. If a contract is priced at 64¢ but you have good reason to think the true chance is 80%, you can buy — and if enough informed traders agree, their buying pushes the price up toward 80¢. Mispricings get competed away. This is why prediction-market prices are often cited as forecasts in their own right: they aggregate scattered information into one continuously updated number.
A sportsbook tells you what it will pay. A prediction market tells you what the crowd believes — and lets you bet against it if you disagree.
Prediction markets vs. sportsbooks vs. the stock market
It is easy to mistake a prediction market for a sportsbook or a brokerage. The mechanics are genuinely different.
| Prediction market | Sportsbook | Stock market | |
|---|---|---|---|
| Who sets the price | Traders, peer-to-peer | The bookmaker | Traders, peer-to-peer |
| You trade against | Other traders | The house | Other traders |
| What you hold | An event contract | A wager / bet slip | A share of a company |
| Range of topics | Politics, sports, economics, more | Mostly sports | Companies & funds |
| US regulator | CFTC (derivatives) | State gaming boards | SEC |
| Built-in margin | Low fees, no “vig” | Vig baked into odds | Commissions / spreads |
The peer-to-peer structure is the crucial part. Because you trade with other people rather than against a bookmaker’s built-in margin, the pricing tends to be tighter, and there is no incentive for the platform to limit winning accounts the way sportsbooks do. We unpack the order-book mechanics in how prediction markets work.
What you can trade on
The early markets were political, but the modern platforms list contracts across almost every domain where an outcome is verifiable. The main categories:
- Politics & elections. Election winners, control of legislatures, confirmations, policy decisions and approval thresholds. Historically the deepest, most-traded markets.
- Sports. Game winners, point spreads, totals, player props and season-long futures across major leagues. The fastest-growing category and the biggest revenue driver for the platforms.
- Economics. Interest-rate decisions, inflation (CPI) prints, jobs reports, GDP and recession calls — markets that read like a live consensus forecast.
- Crypto. Whether a coin closes above a level, ETF approvals, protocol milestones and price ranges.
- Pop culture & awards. Award winners, box-office numbers, chart positions and entertainment outcomes.
- Weather & climate. Daily high temperatures, hurricane landfalls and record-heat thresholds.
- Technology & companies. Product launches, AI benchmarks, earnings beats and corporate milestones.
Not every platform carries every category, and this is one of the main reasons traders keep accounts on more than one. Kalshi tends to have the deepest economic and political markets; sports-led platforms like FanDuel Predicts price game outcomes most competitively.
Binary vs. scalar markets
Almost everything you will trade is a binary market — a clean Yes or No. A smaller set are scalar (sometimes called range) markets, where the payout depends on a number: “What will the unemployment rate be?” A scalar market is usually built from a ladder of binary contracts — “above 4.0%”, “above 4.1%”, and so on — so the same Yes/No logic still applies under the hood.
Are prediction markets legal?
In the United States, federally regulated event contracts are legal. The turning point came in 2021, when Kalshi became the first platform to win a CFTC license to offer event contracts to everyday traders. A 2024 court victory then cleared the way for regulated election markets, and by late 2025 Polymarket had returned to US users through a licensed, compliant structure after years of blocking American access.
The picture is still unsettled in one area: sports contracts. Several states argue that sports event contracts are really unlicensed sports betting rather than financial instruments, and that dispute is being fought in court. In 2026 a federal court sided with the platforms in a key ruling, and the CFTC signalled that it views event contracts as falling under its jurisdiction — but availability of specific markets, especially sports, still varies by state.
You generally need to be 18 or older and physically in a US state where the platform and that market type are available. A handful of states restrict or exclude certain platforms, and rules change. Always check the platform’s current eligibility page before funding an account. Outside the US, availability differs again — Polymarket, for instance, serves many international users that US-licensed brokerages do not.
Is it gambling or investing?
Legally, CFTC-regulated event contracts are treated as derivatives, not gambling. Practically, the honest answer is that it depends entirely on how you trade. Buy a contract on a coin flip you know nothing about and it is a bet. Build a view from polling data, economic releases or a genuine information edge, size your positions sensibly, and it looks far more like trading any other probabilistic instrument. Either way, prices move and money can be lost — which is why we put bankroll discipline ahead of everything else.
How to start
Getting going takes minutes: choose a regulated platform, verify your details, fund the account, and place a small first trade to learn the flow. Our getting-started guide walks through each step, and the platform comparison helps you pick the right exchange for the markets you care about. New to the vocabulary? The glossary defines every term you will meet.
Frequently asked questions
Are prediction markets legal in the US?
Yes. Federally regulated event contracts are legal and overseen by the CFTC. Kalshi won the first license in 2021, a 2024 court ruling cleared regulated election markets, and Polymarket returned to US users in late 2025 through a compliant structure. Sports contracts remain contested in some states, so availability of specific markets varies.
Is trading prediction markets gambling?
Legally, CFTC-regulated event contracts are treated as derivatives rather than gambling. In practice it depends how you trade: a random bet is gambling, while trading from real information with disciplined sizing resembles any other probabilistic investing. Either way money can be lost.
How is a contract price a probability?
Because a winning contract always pays exactly $1, its price is the share of a dollar traders will pay for the chance to win the whole dollar. A 64-cent price therefore implies roughly a 64% chance — the crowd's collective estimate, kept honest by people trading against mispricings.
Can you actually make money on prediction markets?
Yes, but only with a genuine edge and good risk management. You profit when you correctly judge that the true probability differs from the price. Most lasting traders focus on bankroll discipline and position sizing as much as on picking outcomes.
What can you trade on?
Politics and elections, sports, economics such as interest rates and inflation, crypto prices, pop culture and awards, weather, and technology and company milestones. Coverage differs by platform, which is why many traders keep more than one account.