A single Polymarket market moved $280.1 million between two camps: traders who read the word “permanent” as settled fact, and traders who called the ceasefire a temporary truce dressed up in market language. Months after the payout, that argument still runs in trader Discord and Telegram channels. We ranked these fights once before in our roundup of Polymarket resolution disputes, but this list uses one rule only: sort by dollars at risk, largest first. Once a payout clears, most traders stop arguing about a market — ranking by volume instead of drama shows which Polymarket controversial resolutions actually rewired the biggest positions.
Each dollar figure in this ranking traces back to a court filing, a Bloomberg or Wall Street Journal report, or Polymarket’s own public volume data. Wherever the Gamma API exposed a number directly, we pulled it from there first and checked it against the news coverage afterward.
Who actually calls the outcome on Polymarket
No newsroom fact-checks these markets, and no judge signs off on the result — Polymarket hands that job to an oracle system called UMA. One proposer puts up a small bond and names an outcome. That outcome sticks if the challenge window closes without a dispute. Once someone does dispute it, the call shifts to UMA token holders, and whoever controls more voting weight wins the argument, not whoever has the better case.
Deciding a football score this way causes few problems. Deciding hundreds of millions of dollars based on how one word gets defined is a different story entirely. Our breakdown of how the oracle actually works goes deeper into the mechanics, but here’s the short version: token weight decides the truth, full stop, and nothing forces a voter to admit they also hold a stake in the very market they’re ruling on.
1. The $280 million Iran ceasefire fight
Traders bet on one question: would the US and Iran land an official ceasefire by a set deadline? Pull the number straight from Polymarket’s Gamma API and the total volume on that single event reads $280,141,579 — the largest disputed call the platform has ever had to make.
Everything unraveled once the US and Iran struck an interim deal reopening the Strait of Hormuz for 60 days. Traders on the “Yes” side treated that announcement as the ceasefire the market was waiting for. Traders on the “No” side quoted the market’s own rulebook right back, which demanded hostilities end “permanently” — and a 60-day window, by definition, expires.
Journalists digging into the vote discovered that just nine wallets held over half the tokens cast in that decision. Nine anonymous addresses settled a market worth nearly a third of a billion dollars — and the whole outcome hinged on how those nine wallets interpreted a single adverb.
2. The $60 million Bitcoin sale that hinged on a filing date
Strategy built its reputation buying Bitcoin, never selling it. Late May 2026 broke that pattern: the company actually sold some. Polymarket had a contract running on exactly this question — would Strategy offload any Bitcoin before May 31 closed out? Its SEC filing, dated June 1, confirmed the company sold 32 BTC sometime between May 26 and May 31.
Despite that filing, the market settled “No.” The sale itself landed inside the deadline window, but the public paper trail confirming it arrived one day late — and UMA voters chose to count the confirmation date, not the transaction date, as the one that mattered.
William Wood and Thomas Bush didn’t let it go — the pair filed suit in the Supreme Court of the State of New York on July 3, 2026. Their complaint puts a number on the damage: 1,868 traders out a combined $6.5 million, and it argues the confirmation-date requirement showed up nowhere in the market’s original rules. Both Polymarket’s CEO and its chief marketing officer appear as named defendants.
The Wall Street Journal ran the numbers on active UMA voters over the past year and linked at least 60% of them to Polymarket trading accounts — the people deciding these outcomes very often had their own money riding on the answer.
That single stat explains why cases like the Strategy Bitcoin dispute wind up in a courtroom instead of fading away quietly. When the same wallets trading a market also cast the votes that resolve it, whoever ends up losing has every reason to suspect the game was rigged before it started.
3. The $7 million Ukraine minerals deal that resolved before it happened
This dispute happened earlier than the Iran and Strategy cases, but it wrote the playbook for just how badly a single large voter can distort an outcome. The question at stake: would Ukraine sign a minerals deal with the Trump administration before April 2025 arrived? Through most of March, the market priced that at roughly 9%.
Then, over the span of a single day — March 24 to 25, 2025 — one entity shuffled 5 million UMA tokens through three separate accounts, controlling 25% of every vote cast in that dispute round, and forced the market to settle “Yes.” No signed deal existed anywhere. The $7 million payout went out regardless.
A 25% stake shouldn’t be enough to steamroll a well-attended vote. It was enough here, though, because turnout on most individual UMA disputes runs thin enough that a single large holder can win just by showing up when almost nobody else does.
4. The $3.5 million Fort Knox gold audit
The dollar amount here shrinks considerably, but the lesson gets sharper: wording alone flipped this market. Traders bet roughly $3.5 million on whether the US government would “allow” an audit of the Fort Knox gold reserves inside a set window.
The result came back “No,” even though traders pushed back hard — they argued “allow” sets an extremely low bar, one that officials could clear just by voicing openness to an audit, without any audit ever actually happening. The ruling held anyway, and this case now gets cited constantly as proof that a vague verb causes more fights than a vague fact ever could.
5. The $838,000 nuclear detonation market Polymarket pulled entirely
Some of these fights never even reach a resolution. Take the market tracking the odds of a nuclear detonation tied to a specific geopolitical flashpoint: it carried more than $838,000 in open bets and had the odds sitting around 22% right before Polymarket yanked the whole thing off the platform without ever declaring a “Yes” or “No.”
Killing a live market sidesteps the risk of a wrong call, sure, but it also strands capital on both sides with zero clarity on when — or if — anyone gets a refund. A platform that sells itself on transparent, rules-based outcomes can’t really escape the irony: leaving a market unresolved is itself a controversial resolution.
What the pattern says about 2026
Polymarket racked up more than 1,150 disputed markets in just the first five months of 2026, already surpassing its entire 2025 count. The rate at which disputes pile up is outrunning the platform’s ability to draft rules tight enough to avoid them.
Fraud isn’t the thread connecting these five cases — ambiguity is. A ceasefire that must be “permanent,” a sale that must land “by” a date, an audit the government merely has to “allow” — trace any of these disputes back far enough and you land on one word that nobody pinned down before the money started flowing. Reading the exact resolution criteria before placing a bet, instead of skimming just the headline question, would have saved money in every single case on this list. Our guide to reading Polymarket data walks through checking a market’s history and current positioning before you commit any capital.
New York’s attorney general filed suit against Polymarket US in September 2026, challenging whether its contracts amount to unlicensed gambling. That fight runs on a separate track from these resolution disputes, but it circles back to the same core question: who actually answers for it when a market call goes wrong?
