A prediction market lets people buy and sell shares on the outcome of a future event. The price of each share tells you what the crowd thinks the odds are. This guide covers how prediction markets work, what the prices mean, how a market settles, and where you can trade one today.
What is a prediction market
Prediction markets are places where you trade on questions that have a clear yes or no answer. Will a candidate win the election. Will a team make the playoffs. Will inflation come in above a set number. Will bitcoin close the month over a certain price. Each question has a fixed resolution date and written rules that decide the answer.
When people ask what are prediction markets, the short version is this. You are not betting against a bookmaker who sets the line. You are trading with other people. Every share you buy, someone else sells. The price where buyers and sellers meet is the market's best guess at the probability of the event. That is the core idea behind prediction markets explained in one sentence.
How the prices work
Most markets have two outcomes, YES and NO. Each one trades between $0 and $1. The price is the implied probability. A YES share at $0.62 means the market prices the event at about 62 percent. If you think the real chance is higher, you buy YES. If you think it is lower, you buy NO.
YES and NO always add up to $1. If YES is $0.62, then NO is $0.38. This is the $1 rule, and it is what makes the payout simple. When the market resolves, one side is worth $1 and the other is worth $0.
Here is a simple example. You buy one YES share at $0.62. If the event happens, that share pays $1, so you make $0.38. If the event does not happen, the share pays $0, and you lose the $0.62 you paid. A person holding NO at $0.38 has the mirror image. They make $0.38 if the event does not happen and lose their stake if it does.
| YES price | Implied chance | Pays if YES | Pays if NO |
|---|---|---|---|
| $0.20 | about 20% | $1.00 | $0.00 |
| $0.62 | about 62% | $1.00 | $0.00 |
| $0.85 | about 85% | $1.00 | $0.00 |
Prices move as people trade. When new information arrives and traders act on it, the price shifts up or down. So the number you see is not a static guess. It is a live probability that updates as money changes hands.
How a market resolves
Every market has resolution rules and a resolution date written before trading starts. The rules spell out exactly what counts as YES and what counts as NO, and they name the source that decides. For an election it might be the official result. For an economic figure it might be a government report. For a crypto price it might be a set exchange at a set time.
When the date arrives and the outcome is known, the market settles. YES holders get $1 per share if the event happened. NO holders get $1 per share if it did not. The other side gets nothing. Clear rules matter, because a badly worded question can leave people arguing over what actually counts. Good markets remove that doubt up front.
Why prediction markets are often accurate
Prediction markets tend to forecast well for a few reasons. The first is information aggregation. Thousands of people each know a little, and the price pulls all of that into one number. The second is real money. People are betting their own funds, so guessing carries a cost and being right carries a reward. That pushes traders to be honest with themselves instead of loud.
The third is the wisdom of crowds. A large group of independent guesses often lands closer to the truth than any single expert. This is why market prices frequently beat pundits who face no penalty for being wrong.
Being honest matters here. Prediction markets are not always right. They can be thin, meaning few traders, which makes the price noisy. They can move on rumor. They can miss rare events that almost no one saw coming. Treat the price as a well informed estimate, not a promise. For more on reading these signals, see our guide to how to make money on prediction markets.
Where to trade them
A few venues handle most of the volume. Polymarket is the largest crypto based market. It runs on Polygon and uses USDC, and it lists a wide range of questions across politics, sports, and current events. There is also a regulated Polymarket US, offered through QCX, for United States residents. You can browse it at Polymarket.
Kalshi is a CFTC regulated exchange based in the United States that settles in US dollars. It is a fully regulated venue, which some traders prefer. For a side by side look at the main options, read our roundup of the best prediction markets, and if you trade from the US, see whether Polymarket is legal in the US.
SmartX is a terminal built on the Polymarket ecosystem. It adds smart money tracking, so you can see how sharper traders are positioned, and it charges 0.5% fees. It is a way to trade the same markets with more data in front of you.
New here? Check the live rankings to see which markets are moving and where the volume is, then use SmartX to track smart money on the Polymarket ecosystem before you place a trade.
Open SmartX →How to get started
- Pick a topic you actually know. Sports, politics, or a data release you follow closely. Your edge comes from knowing something the price does not.
- Read the resolution rules before you buy. Know the exact question, the source, and the date. Most avoidable losses come from misreading the terms.
- Start small. Place a size you are fine losing while you learn how prices and payouts behave. Scale up only after you understand the mechanics.
That is the whole loop. Find a market, read the rules, buy the side you think is underpriced, and collect $1 per share if you are right. None of this is financial advice. Prediction markets carry risk, and you can lose your full stake.
Frequently asked questions
Are prediction markets accurate?
Often, yes. Because traders bet real money and the price blends many people's information, market prices tend to forecast better than individual pundits. They are not perfect. Thin markets, rumors, and rare surprises can throw the price off, so treat it as a strong estimate rather than a certainty.
Is it the same as gambling?
They share the idea of putting money on an outcome. The difference is that prices in a prediction market reflect real probabilities built from many traders, and many questions turn on public facts like election results or economic data rather than pure chance. It still carries risk, and you can lose your stake. This is not financial advice.
How do prediction markets make money?
Most venues charge a fee on trading activity, and some earn on the spread or on deposits. SmartX, for example, charges 0.5% fees. The traders themselves make or lose money based on whether their side resolves to $1 or $0.
Can prediction markets predict elections?
They give a live probability, not a guarantee. Election markets have a strong track record because they pull in a lot of informed money, but they have been wrong before, especially in close races. Read the price as the crowd's current best estimate, and expect it to move as new information arrives.