You see news saying "ceasefire reached," but Polymarket settles the position as "NO." It is not that your information is outdated. It is because you and the platform are using different "judges." The platform does not look at news. It looks at the data source written in black and white in the market rules.
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Core Conclusion: The "Settlement Source" Written in the Rules Always Wins, Not the News
Polymarket is not a casino. It is more like an arbitration system driven by code and rules. After an outcome occurs, the platform looks for the "final judge" that was written in advance when the market was created. This judge is usually a specific public data source, such as a ranking board, a government website, or on-chain data. News reports are only for reference. The thing written in the rules is the actual judge.
When Settlement Source and News Conflict, Who Has the Final Say?
Remember one principle first: "Facts" do not equal "verifiable evidence." Thinking you are right does not matter. You must produce evidence accepted by the rules for it to count.
Case A: Rules Clearly State "Resolution Based on a Specific Data Source"
[What to do]: Find the "Resolution Source" section in the rules.
[How to do it]: If the rules clearly state "refer to a certain website, ranking board, or document," then the final state of that source is what matters. Even if news reports flood the media, as long as the specified source has not changed, the result stays the same. For example, if a market says it will look at the Chatbot Arena ranking, then even if other evaluation agencies publish different conclusions, it will not affect settlement.
[Completion standard]: You can clearly explain which data source your market uses as the final authority.
Case B: Rules Are Vague or Do Not Specify a Data Source
[What to do]: This situation is tricky. It usually means the market itself is prone to disputes.
[How to do it]: If the rules are unclear or use vague terms like "authoritative interpretation" or "generally accepted," the final result may be decided through UMA voting arbitration. In this process, news reports may be used as reference evidence, but the final ruling is based on the voters' judgment, not the news itself.
Real Cases: Why News Can "Lose" to Rules
Case One: Strategy Sells Bitcoin
The company did sell 32 BTC before May 31, and news outlets reported it. However, Polymarket's rules required "public confirmation before the market deadline," and the SEC filing was only submitted on June 1. The final ruling was NO. The rules looked at "when evidence was submitted," not "when the event happened."
So before placing a trade, always figure out whether the rules recognize "the event happened" or "the event was confirmed." These two standards can produce completely different outcomes.
The Hidden Risk Behind Settlement Disputes: Platforms Can "Clarify After the Fact"
Here is a risk many people do not know about: Polymarket's rules allow "post-hoc clarification." Even after a market has already been settled, the platform can still issue supplementary explanations of the rules and overturn the original result. In June 2026, there was a typical case where an already settled market was overturned due to a platform-issued "settlement clarification," affecting 1,838 accounts and wiping out about $3.8 million in positions.
Risk reminder: Rules are not "locked in once you place a trade and can never be changed." Platform rules allow post-settlement corrections. This is a design flaw in the prediction market mechanism itself, and it is a risk you must accept before participating.
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How to Avoid Pitfalls Before Placing a Trade? Do Three Things
Find the "Settlement Source" section: The market details page should have it. If you cannot find it, ask. If the rules do not clearly state what the final authority is, skip that market.
Distinguish between "event happened" and "event confirmed": Confirm which time point the rules recognize. Getting this wrong can completely flip the result.
Actively search for the market creator's past dispute history: If the creator has a record of previous disputes, it means their rules are often poorly written. Avoid them if possible.
