What is an event contract?
By Editorial Team · Updated November 3, 2026 · How we research this
An event contract is the smallest unit of a prediction market. Before anything else, understand that it is a binary instrument: exactly two outcomes, exactly two payoffs.
The payoff is fixed
Buy a “Yes” contract and one of two things happens at settlement:
- The event occurs → you receive $1.
- It does not → you receive $0.
There is no partial payout, no margin, no “sort of”. This all-or-nothing structure is what makes the price interpretable as a probability, and it is what separates an event contract from almost everything else in finance.
Event contract vs option
An option also pays based on an outcome, but the payoff scales with how far the underlying moves. An event contract does not scale — a win is a win, whether the margin was one vote or one million.
| Event contract | Option | |
|---|---|---|
| Payoff | Fixed $1 or $0 | Scales with underlying price |
| Outcome | A stated event (who wins, what passes) | A price crossing a level |
| Probability | Price = probability | Implied via volatility |
| Settlement | Against a written rule | Against market price |
That fixed payoff is exactly why event contracts are cheap to understand and why they get classified as betting in many jurisdictions: there is no continuous risk to hedge, just a binary claim.
Event contract vs lottery ticket
The difference is information, not structure. A lottery payout is random by design — no amount of skill changes your expected value. An event contract pays based on something you can actually research: polling, team form, court filings, weather models.
That does not make event contracts a sure thing — most traders still lose. It makes them skill-based in a way a lottery is not. Whether that skill-based character should change their legal treatment is the entire regulatory debate.
Why the distinction matters
Whether an instrument is called a “contract” or a “bet” determines whether it is regulated as a financial product or as gambling. The answer varies by country, and it is still being litigated. If you only remember one thing, remember this: the instrument is the same; what changes is which regulator claims it.
If you are deciding whether to use one of these venues, the question is not “is this an event contract or a bet?” but “does a regulator I can name stand behind this venue?” — and that question has a clear answer on licensed sportsbooks and a murkier one on crypto-native markets.
Frequently asked questions
What is an event contract?
An event contract is an agreement that pays a fixed $1 if a specified real-world event happens by a stated date and $0 if it does not. It is a binary, all-or-nothing instrument whose price between $0 and $1 reads as the market's probability of that event.