Polymarket Pulls Nuclear Detonation Market After Backlash Over Suspected Insider Profits

Polymarket pulled a controversial market tied to a possible nuclear detonation after a backlash over unusually large, well-timed bets that suggested insider knowledge.

“Polymarket has discreetly discontinued several prediction contracts that enabled participants to wager on nuclear weapon detonation probabilities”

Blockonomi

Newsweek reported that 'A surge of wagers on prediction markets tied to U.S.-Israeli strikes in Iran has prompted scrutiny after large, well-timed bets produced big payouts for a few accounts.'

Blockonomi

Decrypt detailed a New York Times analysis showing 'more than 150 accounts placed four-figure bets correctly predicting an American strike by the following day, a late surge worth about $855,000.'

Independent reporting noted the market's size and participant interest, with Blockonomi recording that 'The June 2025 nuclear detonation market saw more than $1.7 million in total trading.'

Analysts and blockchain sleuths flagged a small set of accounts that profited unusually large sums in the hours before geopolitical events, prompting allegations of insider trading.

Decrypt reported that one user, "Magamyman", won more than $553,000 betting on the strike and on the fate of Iran’s supreme leader, and that blockchain analytics firm Bubblemaps identified six suspected insiders who together netted about $1.2 million on Polymarket in the hours before the conflict.

CNBC

Newsweek corroborated the pattern, noting that Bubblemaps flagged six accounts that made roughly $1.2 million combined and that one account which joined in February and had no prior activity reportedly earned about $500,000.

Blockonomi’s historical trading figures underline how repeated, concentrated activity can attract scrutiny, reporting that a follow-up contract expiring in June 2025 held trading levels around 12% and drew sustained participation from many traders.

The episode exposed regulatory and operational gaps that critics say make prediction markets vulnerable to manipulation and ethically fraught when tied to war or death.

“In brief - Polymarket has archived a nuclear detonation market hours after posting the odds on X”

Decrypt

Decrypt highlighted governance concerns, stating that “Regulatory gaps are also highlighted: Polymarket’s international site operates outside U.S. oversight even though the company runs a regulated U.S. entity, raising concerns about tacit approval.”

Newsweek quoted critics and lawmakers pressing for transparency: “Critics, including Rep. Mike Levin, have called for transparency and oversight, arguing prediction markets should not enable profiting from advance knowledge of military action.”

Blockonomi’s trade-volume reporting illustrated the scale that regulators and observers find consequential: “The June 2025 nuclear detonation market saw more than $1.7 million in total trading, while a prior 2023 contract generated about $700,000 in bets.”

The controversy also revived earlier disputes over how prediction markets handle outcomes tied to death or regime changes and how rival platforms have responded.

Newsweek recounted Kalshi’s prior troubles, noting that "Rival platform Kalshi also faced user anger over how its Khamenei-related market was settled; Kalshi says it does not list markets that directly settle on death and resolved trades per long-standing rules, reimbursing fees and net losses out of pocket."

Newsweek

Decrypt warned more broadly that "Critics warn that markets tied to war and death risk appearing to enrich insiders and could undermine mainstream credibility."

Blockonomi’s data on earlier contracts adds context for why users reacted strongly to settlement practices: "A prior 2023 contract generated about $700,000 in bets."

In response to the backlash, regulators and market-watchers signalled growing focus on prediction-market rules and enforcement.

“Polymarket has discreetly discontinued several prediction contracts that enabled participants to wager on nuclear weapon detonation probabilities”

Blockonomi

Decrypt noted regulatory steps, stating that “The CFTC, whose new chairman Michael Selig has made prediction-market rules a priority, has submitted an advance notice of proposed rulemaking to begin stakeholder consultation toward a single federal standard.”

Blockonomi

Newsweek likewise observed mounting pressure, writing that “Legislative pressure for greater regulation of prediction markets has been growing amid concerns about insider trading and bets tied to military action or death.”

Blockonomi’s trading figures underline why such rulemaking is seen as urgent: “The June 2025 nuclear detonation market saw more than $1.7 million in total trading.”