Voided Contracts: What Happens When a Market Can't Resolve
Most contracts settle YES or NO. Some end in a gray zone, and the rules written before the first trade decide what happens.
Published 2026-11-02 · Market & data intelligence · Educational, not advice.
Most prediction market contracts settle cleanly at YES or NO. Some don't: events get postponed, data releases slip, wording turns out to be ambiguous, or the outcome is disputed. When that happens, the contract's own rules decide the result. That can mean a fallback source, a void that returns money to both sides, a split settlement, or a formal dispute. The price may already carry some of that risk.
A prediction market contract is a simple promise. If the event happens, YES pays out in full and NO pays nothing. If it doesn't, the reverse. Every price you see between those two ends is the market's running estimate of which way it will go.
That promise only works if someone can say, clearly and on time, what actually happened. Most of the time that's easy. Sometimes it isn't, and those are the cases worth understanding before they come up.
Why clean resolution is the whole product
In the typical exchange model, a prediction market is an exchange, not a house. Every contract has a buyer and a seller on opposite sides. The exchange matches them and takes a fee, and typically holds no position itself. The price is just where the latest buyer and seller agreed to trade.
So when an event doesn't resolve cleanly, there is usually no house to quietly absorb the problem. There are two counterparties with opposite claims on the same pool of money, and the contract's rules have to say who gets what. This is why serious venues write out each contract's terms in detail: what counts as YES, which source decides it, by what deadline, and what happens if that source fails.
The ways an event fails to resolve cleanly
Messy resolutions tend to fall into a few familiar patterns:
- Postponement or cancellation. A game gets rained out, a vote is delayed, a scheduled announcement never happens.
- A delayed or missing source. An economic contract may settle on an official data release. If a government shutdown or agency decision delays that release, the contract may have nothing to settle against when it expected to, unless its rules provide a fallback.
- Ambiguous wording. The question seemed clear when it was written, then reality found an edge case. Does a resignation that has been announced but isn't yet effective count? Does a preliminary figure count, or only the final one?
- A disputed outcome. Reasonable people, or official sources, disagree about what happened.
- Events overtaking the question. The thing being asked about stops existing in the form the contract assumed.
What venues typically do
The answer is nearly always in the contract terms, which is why those terms are worth reading before anything else. The usual mechanisms look like this.
Fall back to a backup rule
Many contracts name a primary source and then say what happens if it isn't available by a set date. That might be a secondary source, an extended deadline, or a default outcome. A contract asking whether something happens "by" a date often settles NO if the date passes without it, even if it later happens. A postponement can still produce a clean result if the rules anticipated it.
Void and return
Some contracts, when the event can't be resolved under their terms, are voided. Positions are unwound and money is returned according to the venue's rules. Whether fees are refunded depends on the venue. Where the exchange holds no side, a void isn't a win or a loss for the exchange. It just returns the money to where it was.
Settle at a set value
Some contract rules can allow settlement at a fixed value, such as an even split between YES and NO, or at a value set by a procedure in the rules. This tends to apply when the outcome is truly unknowable or the question has broken down. Both sides get a partial payout instead of one side taking everything.
A formal dispute process
Venues decide outcomes in different ways. Some settle according to their own published contract rules and named sources. Others run resolution through an outside process, where someone proposes an outcome and others can challenge it before it becomes final. In either system, a contested result can take longer to settle than the event itself did to happen.
How resolution risk can show up in the price
Traders can see these risks coming, so messy-resolution risk doesn't have to stay hidden until the last day. It can be priced in.
When a contract's wording leaves room for argument, prices can sit further from the extremes than the underlying event alone would suggest. Part of what a buyer pays for YES is a view on the event. Part is a view on how the referee will rule. Two contracts on what looks like the same outcome, at different venues or with different wording, can trade at different prices for exactly this reason. They aren't the same contract.
Resolution risk also shows up as time. A contract stuck in dispute ties up capital. That carrying cost is real, and it can affect how willing people are to hold positions near expiry when the outcome looks contestable.
Reading the rules like a professional
People who follow these markets closely tend to look at the same few things in any contract:
- The exact wording of the YES condition, including edge cases.
- The named settlement source and what happens if it's late or missing.
- The expiration date and whether "by" means the event or the announcement.
- Whether the venue can void the contract or settle it at a set value, and under what conditions.
None of that tells you what will happen. It tells you what the price is actually a price of. That's the more useful thing to know.
Comparing the same question across venues makes these differences visible, and it is often the fastest way to notice when two similar-looking contracts aren't really the same question.
What comes next
Resolution rules are the plumbing of prediction markets. Nobody thinks about them until something leaks. Next in The Line, we'll look at the step just before settlement: how settlement sources are chosen, why some contracts settle on a preliminary figure and others wait for a revision, and how that one detail can quietly change what a contract is worth.
Sources
This explainer quotes no live prices. These are the regulator and platform pages that define how event contracts work.
References for this topic
- CFTC: Prediction markets (Learn and Protect)cftc.gov
- Kalshi Help Centerhelp.kalshi.com
- Polymarket documentation: Polymarket 101docs.polymarket.com
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