A prediction market only pays out once someone decides which outcome actually happened. On Polymarket that decision is made by the market's written rules — not by its headline. The title is a summary; the rules are the contract, and when the two seem to disagree, the rules win. The single most expensive mistake new traders make is reading the title and skipping the rules.
How resolution actually works
Most Polymarket markets settle through UMA's optimistic oracle. After a market closes, a proposer posts the outcome with a bond. Anyone can dispute it during a short challenge window, and if they do, the question escalates to a vote of UMA token holders. A small set of purely objective markets — crypto prices, some weather and score feeds — skip the human step and resolve automatically against a data source instead.
The practical takeaway: for most markets, the thing you are really betting on is not just the event, but whether the rules describe that event clearly enough that a proposed outcome stands unchallenged.
Where the risk comes from
Resolution risk lives in language that needs a judgement call. Rules that lean on words like "consensus," "credible reporting" or "widely considered" push the decision onto whoever proposes and votes. Rules that hinge on a single tweet, a deleted post, or one organisation's announcement inherit all the ambiguity of that source. And rules that leave edge cases unspecified invite exactly the disputes that drag a market out for days.
The opposite is reassuring. A market that resolves against an official final score, a certified election result, or an exchange price at a named timestamp gives proposers and disputers very little room to disagree. Those are the markets where the printed price is closest to the real odds.
Why it matters more than it used to
Disputed resolutions are no longer rare. When a market does get disputed, the outcome is decided by a token-holder vote — a mechanism that has drawn criticism precisely because, on ambiguous high-stakes markets, the people voting can have positions of their own. That means a vague rule on a large market isn't just a slow payout; it's a genuine source of uncertainty about which side gets paid at all.
How Edge Radar scores it
Edge Radar reads each market's resolution rules and flags the patterns above — explicit ambiguity, discretionary calls, dependence on social posts, and missing objective anchors — while crediting markets that name a hard source. It also surfaces markets whose result has already been proposed or disputed on-chain, since those are where the price can jump on the ruling rather than the event. The score is a reading aid, not a verdict: every flag is shown so you can judge the rule yourself.
FAQ
How do Polymarket markets resolve?
Most markets settle through UMA's optimistic oracle: someone proposes the outcome with a bond, anyone can dispute it during a short window, and a contested result escalates to a vote of UMA token holders. Some objective markets resolve automatically against a data feed. Every market has written rules naming the resolution source, end date and edge-case handling — those rules, not the title, decide the outcome.
What makes a market's resolution risky?
Risk comes from rules that need a judgement call: subjective or discretionary language, dependence on a single social-media post or one party's announcement, ambiguity about edge cases, or no objective source to check against. Markets that resolve against an official score, certified result or exchange price feed are far harder to contest.