The difference is who takes the other side: a sportsbook is your opponent and prices its own margin into the line, while on a prediction market another person takes the other side and the venue only matches the two of you. That one fact drives the rest: what the price really costs you, whether you can get out before the final whistle, and what happens if you keep winning. Same game, two different products.
Who takes the other side
At a sportsbook you are betting against the house. It writes the line, books your wager, holds the risk, and profits when you lose. Nothing about that is hidden, it is simply the business model.
On a prediction market you are buying a contract that somebody else is selling. It pays $1 if the outcome happens and $0 if it does not, and the price in cents is the market's read on the probability. The venue is not your opponent: it runs the order book, settles the contract, and charges a fee. Your winnings come from the person who sold to you.
Two formats for the same probability
A sportsbook quotes odds. A prediction market quotes a price in cents. Both are probability in different clothes: a contract at 55 cents is a 55% chance. Odds of -110 imply 52.4%, because a $110 risk returning $100 has to win 52.4% of the time to break even. Convert both to percentages and you can compare them line for line. This is the same structure a betting exchange runs on, so peer-to-peer betting covers the matching side and how to read prediction market prices covers reading the contract.
Where the margin sits: a worked example
Take a game both sides rate as a coin flip. A sportsbook posts -110 on each team. Each side implies 52.4%, so the two add up to 104.8%. Probabilities cannot exceed 100%, and that extra 4.8% is the house margin, built into the price before you place a bet.
A prediction market on that same coin flip trades near 50 cents a side. You buy the yes at 50, someone else buys the no at 50, and the two add up to $1.00, or 100%. Nothing is skimmed out of the price, because no one has taken a position against you, and the fee is charged on the trade instead of buried in the number.
Both sides of a fair market add up to 100%. At -110 they add up to 104.8%, and that 4.8% of overflow is the book's margin. It is the whole reason you need to win 52.4% of your bets there to break even, and roughly 50% on a fairly priced contract.
Run both quotes through the prediction market calculator to see it directly. It turns a cent price into implied probability, American odds and payout, so a 50 cent contract and a -110 ticket sit side by side in one format.
Getting out before the game ends
A sportsbook bet is normally locked once it is placed. Some books offer a cash out, but it is optional, priced by the book, and usually worth less than the position. You are asking your opponent to quote you a fair exit.
A prediction market contract is a position you can sell. Buy at 40 cents, watch the price move to 70, and you can sell to another buyer at 70 and bank the difference without waiting for the game to settle. The catch is that somebody has to want it at that price: selling out of a busy market is straightforward, selling out of a quiet one can mean dropping your price.
Fees, limits and where each one is legal
The rest follows from the counterparty question.
- Where the cost lives. A sportsbook bakes its cut into the odds, so you pay it on every bet whether you notice or not. A prediction market charges a stated fee on the trade. Neither is free, but only one is visible.
- What happens when you win. Books limit and close winning accounts, because your profit comes out of theirs. A venue that only matches buyers and sellers has no reason to care.
- Whether your bet gets taken. A sportsbook will always book you, at its number. A prediction market needs a real person on the other side, so a thin market may fill slowly or not at the price you wanted.
- How each is regulated. Sportsbooks are licensed state by state, so what you can bet depends on where you stand. Event contracts trade on federally regulated CFTC exchanges such as Kalshi, which is why they have turned up in states with no legal sportsbook, and why that gap has been fought over in court.
- What you can bet on. Sportsbooks are built for sports and carry deep prop and parlay menus. Prediction markets started outside sports and their sports coverage is usually shallower.
The short version
A sportsbook sells you a wager and takes the opposite side, so the price carries its margin and winning too often gets you cut off. A prediction market sells you a contract another person is selling, so the price sits closer to the real probability and you can trade out early. The cost is liquidity, so compare both in one format and take the cheaper number, because over a season those 2.4 points matter more than the branding.
Prediction markets vs sportsbooks FAQ
What is the difference between a prediction market and a sportsbook?
The difference is your counterparty: a sportsbook takes the other side of your bet itself and builds a margin into the odds, while a prediction market matches you with another person and charges a stated fee instead. That is why two sportsbook sides at -110 add up to 104.8% while two fairly priced contracts add up to 100%, and why a prediction market lets you sell out early where a sportsbook holds your bet until it settles.
Are prediction markets better than sportsbooks?
Prediction markets usually give you a better price, because no house margin is padding the number and the fee is charged openly on the trade rather than hidden in the odds. The trade-off is liquidity: a sportsbook always takes your bet across a huge menu, while a prediction market needs a real person on the other side.
Is Kalshi a sportsbook?
No, Kalshi is a federally regulated exchange where people trade event contracts with each other, not a sportsbook that books bets against you. Contracts settle at $1 if the outcome happens and $0 if it does not, and Kalshi earns a fee for running the market rather than profiting when a customer loses.
Reading the gap between 104.8% and 100% is one thing, getting the better side of it is another. On BettorEdge community odds you set your own number against other real bettors with no house margin padding the line and no risk desk deciding you win too often. Open BettorEdge and get this price for real, peer to peer.
Build your parlay where the odds are better.
Sportsbooks pad every leg with vig, so long parlays are where the house wins most. On BettorEdge you set your parlay against real people and keep more of the payout.