How Do Prediction Markets Work? A Beginner's Guide

A prediction market exchange is a place where you trade on whether things will happen: will inflation come in above 3%, will the Fed cut rates, will it rain in New York, who will win a game. Each question is a market, and you buy contracts that say yes or no.

This guide walks through how it works, from opening an account to getting paid, with the numbers that matter.

The contract: $1 if you're right

Every contract on a regulated U.S. prediction market exchange settles at $1 or $0. If you buy YES and the event happens, each contract pays $1. If it doesn't, it pays nothing. NO works the other way round.

So the price is the market's estimate of the chance. A YES price of 35¢ means traders, together, think there's about a 35% chance. Buy at 35¢ and be right, and you make 65¢ per contract before fees; be wrong and you lose the 35¢. Use the odds calculator to turn any price into odds.

Who you're trading against

The exchange is not a bookmaker. Prices come from other traders' orders: someone selling YES at 35¢ is someone else buying NO at 65¢. The exchange doesn't take the other side of your trade; it matches buyers and sellers and charges a fee.

Step by step

1. Open an account and verify your identity. A regulated U.S. exchange checks who you are.
2. Deposit dollars from a linked bank account or card.
3. Pick a market and read its rules: exactly what counts as YES, which source decides, and when it closes.
4. Place an order. A market order buys at the best price available now; a limit order sets the most you'll pay and waits.
5. Hold or sell. You can sell before the market settles, at whatever price other traders will pay then, locking in a gain or cutting a loss.
6. Settlement. When the outcome is known, winning contracts pay $1 each into your balance; losing contracts pay nothing.
7. Withdraw to the bank account in your name. Bank transfers usually take a few business days.

Fees

A common fee schedule charges takers 0.07 × contracts × price × (1 − price), rounded up to the next cent. It's highest at 50¢ (about 1.75¢ per contract) and small near 1¢ and 99¢. Some markets charge a lower fee for orders that rest on the book. If you sell before settlement, the sale is charged too.

Example: 100 contracts at 35¢ cost $35.00 plus 0.07 × 100 × 0.35 × 0.65 = $1.5925, rounded up to $1.60. Try it in the fee calculator.

How payouts work

You don't claim a payout. When the market settles, the exchange credits $1 per winning contract to your account automatically. Settlement timing depends on the market: a sports game settles soon after it ends; an economic market settles when the data is released, which can be days or weeks after trading closes. The rules page for each market says when.

Kinds of markets

• Economics: inflation (CPI), jobs, GDP, interest rates.
• Finance and commodities: index levels, oil, gold, gas prices.
• Crypto: Bitcoin and Ethereum price ranges.
• Weather: daily temperatures and rain in major cities.
• Politics, culture and sports, where available in your state.

Many markets are a ladder of related contracts, such as "CPI above 0.2%", "above 0.3%" and so on, so you can trade the exact range you have a view on.

Common beginner mistakes

• Treating cheap contracts as bargains. A 5¢ contract usually wins less than 5% of the time; see the favorite-longshot bias.
• Not reading the rules. Many disputes come from a market settling on a different source or time than the trader assumed.
• Ignoring fees and spreads on frequent small trades.
• Betting too much on one market. Even good traders lose often.

Try it without risking money

The quickest way to learn is to trade. Lenium's free demo gives you a simulated account on live market prices, so you can practise buying, selling and settlement before using your own money. When you're ready to go further, read how to make money on prediction markets and are prediction markets legit?.