A binary event contract turns a future event into a tradeable instrument with a fixed settlement value. A common structure pays $1 if the stated outcome occurs and $0 if it does not. Before settlement, the contract can trade anywhere between those endpoints. That is why a Yes contract at 72¢ is simultaneously a price, an amount at risk and a market signal—but it is not a guarantee that the event has a 72 percent true probability.
The CFTC’s consumer guide to event contracts uses this basic $1 framework and notes that traders can enter and exit positions before settlement. Once that mechanism is clear, gains and losses are simple to calculate. The harder parts are understanding execution price, fees, liquidity and the exact settlement rule.
From contract price to maximum payout
Assume a Yes contract costs 70¢ and pays $1 if the event occurs. Buying one contract costs 70¢. If Yes is the final result, the gross settlement gain over purchase cost is 30¢. If No is the final result, the contract settles at $0 and the 70¢ purchase cost is lost. Fees can reduce the net result in either case.
| Purchase | Settlement | Gross result before fees |
|---|---|---|
| Buy Yes at 70¢ | Yes = $1 | +30¢ |
| Buy Yes at 70¢ | No = $0 | -70¢ |
| Buy Yes at 25¢ | Yes = $1 | +75¢ |
| Buy Yes at 25¢ | No = $0 | -25¢ |
Scaling to 100 contracts changes the dollars, not the logic. One hundred Yes contracts bought at 70¢ cost $70 and settle for $100 if Yes wins, for a $30 gross gain before fees. If No wins, the $70 position can go to zero.
Why 70¢ is not the same as 70 percent truth
Prediction-market prices are commonly read as implied probabilities because a $1 binary payoff makes the cents intuitive. A 70¢ Yes price is often described as the market assigning about a 70 percent chance. More precisely, it is the price at which market participants are currently willing to trade, subject to fees, bid-ask spread and liquidity.
A thin market can move sharply on one order. A crowded market can reflect shared misinformation. Traders may have hedging motives rather than pure forecasting motives. The price can therefore be informative without being a mathematically verified probability of the event itself.
This is similar to, but not identical with, the distinction between sportsbook implied probability and true probability. GambleRoad’s odds and implied probability guide shows how bookmaker prices embed margin. Event-contract prices arise from an exchange market instead of a bookmaker line, but neither format removes uncertainty about the real-world outcome.
Trading before settlement changes the result
A trader does not always have to wait for the event to finish. If a Yes contract bought at 40¢ later trades at 65¢, the holder may be able to sell and realize a gain before final settlement. The economic result then depends on the exit price rather than on whether the underlying event eventually resolves Yes or No.
For example, buying 100 Yes contracts at 40¢ costs $40. Selling those 100 at 65¢ produces $65 before fees, a $25 gross trading gain. The event might later resolve No, but that would no longer affect the closed position. Conversely, a holder may sell at a loss to reduce exposure before the final outcome.
Liquidity matters here. A displayed last price does not promise that the entire position can be sold there. The order book may have only a small number of contracts available at the best bid, with worse prices for additional size. The CFTC’s August 2026 pricing advisory emphasizes the importance of showing market depth rather than presenting exchange prices as if they were fixed sportsbook odds.
Fees and spreads can change apparently simple math
The fixed $1 payout can make event contracts look frictionless, but transaction costs still matter. Depending on the platform and product, customers may pay trading fees, face a bid-ask spread, or incur other disclosed charges. The CFTC advises customers to review commissions, fees, penalties and other costs before trading.
Suppose a contract appears to offer 10¢ of gross upside from a 90¢ purchase. A few cents of combined spread and fees represent a large share of that possible gain. By contrast, a 20¢ contract has more gross upside if it settles Yes but a much lower market-implied chance of doing so. Comparing only the maximum payout hides the relationship between risk, price and probability.
For readers familiar with value betting, GambleRoad’s value betting guide explains why a favorable payout matters only when the underlying probability estimate is sound. The same principle applies here: a cheap event contract is not automatically a good trade.
Settlement is a contract-rule question
A binary contract pays according to the formal resolution criteria, not what traders personally believe “should” have happened. The terms identify the source agency, measurement, deadline and other conditions. If a market asks whether an official statistic exceeds a threshold, the authoritative source in the rules controls even if another website reports a different number first.
The CFTC’s July 2026 event-contract certification advisory specifically highlighted settlement methodology and data sources as information exchanges must evaluate when listing contract series. That is a useful warning for customers too: the settlement rule is part of the economics of the position.
Before buying, a trader should be able to answer four questions: what exactly makes Yes win, what source determines that fact, when does the market stop trading, and what happens if the event is delayed, cancelled or corrected? The $1-or-$0 payoff is simple only after those questions are settled.
A clean way to compare a contract
Start with the actual executable price rather than the headline probability. Calculate maximum gross gain and maximum loss, then adjust for known fees. Check the bid-ask spread and available size. Decide whether the market price is merely reflecting consensus or whether you have a defensible reason to estimate the outcome differently.
Finally, read the settlement source and timing. An event contract is a financial instrument whose value depends on both the real-world event and the written definition of that event. Good analysis therefore separates three things: the market price, your probability estimate and the contractual settlement rule. Confusing any two of them can turn a simple 70¢ quote into a misunderstood trade.