By PredictQ Team // Updated: August 2026
Bet $110 to win $100 at a sportsbook and you have to be right 52.38% of the time just to break even. Not to profit. To break even. That number is the house's cut, and you pay it on every ticket you write, win or lose.
Prediction markets charge for the same risk differently, and once you can do that math yourself, a lot of decisions get easier. This guide covers what you're actually buying, what it costs, where to trade it in 2026, and where these markets are still worse than the thing you're used to.
A Paradigm poll found that roughly 1 in 5 Americans check prediction market odds without ever putting money down. They're reading these markets the way you'd read a weather forecast. If you're going to look at the number anyway, it's worth knowing what it means.
What you're actually buying
A prediction market contract is a bet on a yes-or-no question that settles at $1 if you're right and $0 if you're wrong. That's the whole instrument. "Will the Fed cut rates in September?" trades as a contract. So does "Will the Chiefs win the AFC?"
Because it settles at a dollar, the price is the probability. A contract trading at 62 cents means the market thinks there's a 62% chance it happens. Buy it at 62 and you're risking 62 cents to make 38.
Here's the part that trips people up coming from sportsbooks: you don't have to wait for the event. You can sell before settlement. If you bought at 62 and news pushes it to 78, you can take the 16 cents and walk. Your position is an asset, not a locked ticket, and that changes how you manage a bad read.
The math that matters
Sportsbooks bury their fee in the odds. Prediction markets charge it openly. Comparing them is the single most useful thing a new trader can learn to do.
Take a coin flip. At a sportsbook you're laying -110, risking $110 to win $100. Break-even win rate is 110 divided by 210, or 52.38%.
Now the same coin flip on Kalshi, which charges takers 7% times the price times one minus the price. At 50 cents that's 0.07 x 0.50 x 0.50, or $0.0175 per contract. Buy 100 contracts and you've spent $50 plus $1.75 in fees. Win and you collect $100. Break-even win rate is 51.75%.
So the edge is real: 52.38% versus 51.75%. It's also modest, about six tenths of a point at coin-flip prices. Anyone selling prediction markets as free money is selling something. What the gap does is widen at the extremes, where sportsbook juice on heavy favorites and long shots gets ugly and the exchange fee formula shrinks toward zero.
Where to trade in 2026
Nine venues matter right now, and they're not interchangeable. The short version of who each one is for:
Kalshi is the broadest regulated exchange, running its own CFTC-licensed market and clearinghouse since 2020. Politics, economics, weather, culture, sports. If you want one account that covers the most ground, start here. Its sports contracts are blocked or contested in a handful of states, so check availability before you plan around it.
Polymarket relaunched in the U.S. in December 2025 and was clearing over $200 million in daily volume by June 2026. The political order books are the deepest anywhere, and makers pay nothing, which matters if you're patient enough to post a limit order instead of hitting the ask.
ProphetX got CFTC approval in June 2026 as the first sports-native exchange with its own clearinghouse. Underdog Predict launched its own exchange in July 2026 and now holds all three major licenses, with IG Group acquiring the company in a deal worth up to $1.3 billion. Both are built for people who came from DFS and think in players and props.
Then there are the sportsbook and brokerage brands: DraftKings Predictions, FanDuel Predicts, Robinhood, Coinbase Predict, OG.com and Novig. Familiar interfaces, narrower catalogs, and in DraftKings' case sports contracts only in the 18 states where its sportsbook doesn't operate. We break all of them down in the 2026 platform comparison, and the two biggest go head to head in Kalshi vs Polymarket.
Your first trade, in five steps
Pick a market you already follow. Not the one with the biggest volume. The one where you'd argue with a stranger about the number.
Write down your own probability first. Before you look at the price. This is the whole discipline, and skipping it is how you end up agreeing with the market and calling it analysis.
Compare, then decide. If you say 70% and it's trading at 62, you have a reason to buy. If you say 65 and it's trading at 64, you don't have a trade, you have a coin flip with fees.
Size it so you don't care. First ten trades are tuition. Keep them small enough that being wrong is information rather than a problem.
Log the reason, not just the position. A month later the only thing worth reviewing is whether your reasoning was sound, and you will not remember it.
Now the honest part
Four things about these markets are worse than what you're used to, and you should hear them from us rather than find them out at settlement.
Liquidity thins out fast. Headline markets are deep. Go three clicks down into a niche contract and the spread is wide enough to eat your edge before the event resolves. The quoted price is not always a price you can get filled at in size.
State availability is a patchwork. Every platform has a different map, and the maps change by court order. Michigan blocked Kalshi's sports contracts in June 2026, a New York judge ruled in July that the state can enforce its gambling rules, and none of that was on anyone's roadmap.
Resolution is a real risk. A contract is only as good as its wording. Ambiguous events get settled by rules you agreed to and probably didn't read. Read the resolution criteria before the money, not after.
The edge is small and you still have to be right. Cheaper fees don't make you a better forecaster. They just mean a good forecaster keeps more. If you're a losing sports bettor, you'll likely be a slightly-less-losing prediction market trader.
Who this is actually for
If you bet sports: the fee comparison is the reason to care, especially on futures, where sportsbook holds get ugly fast. Justin wrote about why he's done with futures at books, and that math is the clearest case for switching.
If you play DFS: Underdog Predict and ProphetX will feel closest to home, and the ability to sell out of a position mid-season is something no best ball roster gives you.
If you follow politics: Polymarket's books are where the real money disagrees with the pundits. Our guide to trading politics on Kalshi and Polymarket goes deeper on the mechanics.
If you're a journalist or researcher: you can use these numbers without ever funding an account. A market price is a probability with money behind it, which is a far better citation than a pundit's gut.
I'm not using a market price to tell me what to do, the same way I'm not letting the Vegas number pick my DFS lineup. I'm using it to find out where my read differs from everyone else's, and then asking why.
What we're still figuring out
The open questions are the interesting ones. Which of these markets are actually predictive and which are just noise dressed up as a probability? Where do the crowds have blind spots, and how long do those blind spots survive once volume shows up? What can you see in a thin market that nobody trading a headline contract can?
That's what we're working on at PredictQ, and we don't have all of it solved. If you want to argue about any of it, we'll be in the PredictQ Discord.
Disclosures: PredictQ may receive compensation when readers sign up for platforms through links on this page. Information accurate as of August 2026. Platform availability, fees and promotional offers vary by state and change frequently; confirm current terms in-app before trading. Trading event contracts involves significant risk. This content is for informational purposes only and is not financial advice. Must be 18 or older (21+ in some states). If you or someone you know has a gambling problem, call 1-800-GAMBLER.