Prediction Markets
How prediction markets and event contracts price outcomes, what exchange fees and settlement rules cost a trader, and who regulates them in the US.
A prediction market is an exchange where people trade contracts on whether an event will happen. A typical contract pays a fixed amount, one dollar, if the outcome occurs and nothing if it does not. Its price, quoted in cents, reads as the market's implied probability. In the US these contracts are called event contracts, and when listed on a regulated exchange they sit under federal commodities law rather than state gambling law. That jurisdictional split is the whole fight.
How does a prediction market price an outcome?
A contract trading at 40 cents implies roughly a 40% chance, before costs. Buyers of Yes profit if the event happens, sellers profit if it does not, and the exchange matches the two sides. Real returns depend on more than the headline price: trading fees, the spread between bid and ask, and the exact resolution wording all move the break-even probability a trade needs. A cheap contract is not good value until those costs are counted.
Who regulates event contracts?
The Commodity Futures Trading Commission oversees designated contract markets under the Commodity Exchange Act. Its rules let it bar event contracts that involve gaming, terrorism, war, assassination or unlawful activity, and the meaning of "gaming" in that rule is now contested. Sports and election contracts have drawn challenges from state gaming regulators, who argue they are unlicensed sports betting, and from tribal gaming interests. Some venues operate offshore or on crypto rails with their own access limits. The answer to "is this legal where I am" depends on the venue, the contract and the state.
Why do prices differ between venues?
Two exchanges can list the same question at different prices because their fee schedules, resolution sources, settlement timing and eligible users differ. An apparent arbitrage often disappears once those rule differences are read side by side.
How CasinoX covers prediction markets
We work from exchange rulebooks, published fee schedules, CFTC filings and orders, and court rulings. Every calculation shows its inputs. We do not recommend trades.
Start with the prediction market calculator for price, fee and break-even math. Then read why cross-venue arbitrage gaps persist, which shows how fees and resolution rules turn a price gap into risk.
