What Is a Prediction Market? A Plain-English Guide
A prediction market is a marketplace where people trade shares tied to a yes-or-no question about the future — "Will this candidate win the election?", "Will the Fed cut rates this meeting?", "Will this team win the championship?" Each share pays out $1 if the answer turns out to be yes, and $0 if it turns out to be no. Because traders buy and sell those shares freely, the price at any moment reflects what the crowd collectively believes the probability is.
The core mechanic: price = probability
Every market has two sides, Yes and No, priced between $0.01 and $0.99. If Yes trades at 33¢, the market is saying there is roughly a 33% chance the event happens. Buy a Yes share at 33¢ and you stand to collect $1 if you're right — about a 3x return — or lose your 33¢ if you're wrong. That simple structure is the whole engine. We walk through it step by step in how to read prediction market prices.
What happens when the event ends
Every market has written resolution criteria: the exact conditions under which it settles Yes or No, and the source used to decide. When the event resolves, correct shares pay $1 each and incorrect shares expire worthless. Experienced traders read the resolution rules before they read anything else, because the fine print — not the headline — decides who gets paid.
Where people trade them
The two best-known platforms are Polymarket and Kalshi. Polymarket runs on crypto rails (trades settle in the USDC stablecoin) and became famous for its election markets. Kalshi is a US-regulated exchange where you trade in dollars. They differ in regulation, fees, and market selection — we compare them honestly in Polymarket vs Kalshi.
Why anyone cares about these prices
Prediction market prices are useful even if you never trade. Because traders back their opinions with money, prices tend to absorb news within minutes and are hard to spin. Journalists, analysts, and researchers increasingly quote them as a live snapshot of what informed money believes — a habit that started with academic projects like the Iowa Electronic Markets in the late 1980s.
The honest risk paragraph
You can lose real money. Prediction markets reward information and discipline, but a probability is not a guarantee, and beginners routinely overrate their own edge. Whether this is "gambling" is a fair question — we take it seriously in are prediction markets gambling? — and if you do decide to trade, start with the first-bet safety checklist.
Learn it like a game, before any money moves
We built Polywise after watching friends jump into Polymarket with real money and no idea what 33¢ meant. It teaches prices, edge, fees, and resolution rules through free bite-sized lessons — no account, no deposit.
Start learning prediction markets free →Frequently asked questions
Are prediction markets legal in the United States?
It depends on the platform. Kalshi operates as a CFTC-regulated exchange in the US. Other platforms have different regulatory setups, and availability changes by state and over time, so always check the platform's own eligibility page before signing up.
How do prediction market platforms make money?
Most platforms charge trading fees, settlement fees, or withdrawal fees rather than betting against you. Unlike a casino, the platform is usually a neutral marketplace matching buyers and sellers, and its revenue comes from facilitating trades.
How accurate are prediction markets?
Research on markets like the Iowa Electronic Markets has found prices to be well-calibrated on average: events priced at 70% really do happen roughly 70% of the time. They are not crystal balls though — a 70% favorite still loses 3 times out of 10.
What is the difference between a prediction market and sports betting?
In sports betting you bet against a bookmaker who sets odds with a built-in margin. In a prediction market you trade against other people, prices move with supply and demand, and you can sell your position before the event resolves — more like a stock exchange than a sportsbook.
Can I try prediction markets without real money?
Yes. Polywise teaches the full flow — reading prices as probabilities, judging edge, and checking resolution rules — through free game-like lessons, no account or deposit required.