Prediction markets face questions on bets on the Iran war, from nuclear detonation to regime change

• Polymarket removed markets on nuclear detonation timing that showed a 22% probability by year-end, while Kalshi refunded bets on Iran's supreme leader being ousted, citing regulations against death-related wagers
• A single prediction market on U.S. strike timing accumulated over $500 million in bets, with some traders making hundreds of thousands on well-timed wagers that raised insider trading concerns
• Proposed legislation by Democratic lawmakers would bar government officials from trading on prediction platforms and restrict markets on military actions, though bills currently lack Republican support

Summary: Prediction Markets Face Scrutiny Over Iran War Betting

Key Developments:

Prediction markets, particularly Polymarket and Kalshi, are facing significant backlash and regulatory scrutiny over wagering on Iran war-related events. Polymarket last week archived markets allowing bets on nuclear detonation timing after these contracts attracted hundreds of thousands of dollars. The company had posted—then deleted—odds showing a 22% probability of a nuclear detonation by year-end.

Major Platforms and Figures:

Polymarket CEO Shayne Coplan defended the practice as "innovative and disruptive," calling it a "complicated question" while emphasizing prediction markets' informational value. Kalshi issued refunds on a multi-million dollar market concerning Iran's Supreme Leader Ali Khamenei's potential ousting, citing regulations prohibiting death-related wagers. Khamenei was confirmed killed in U.S.-Israeli airstrikes on February 28.

Market Activity:

One Polymarket prediction market on U.S. strike timing accumulated over $500 million in bets. Crypto-analytics firm Bubblemaps identified suspicious, well-timed wagers on U.S. strikes against Iran that netted traders hundreds of thousands of dollars.

Regulatory Response:

The Commodity Futures Trading Commission (CFTC) serves as the main regulator for U.S. prediction markets. Democratic lawmakers have proposed two bills:

• Sen. Murphy and Rep. Levin's measure would restrict markets on military actions, regime change, or deaths
• The "End Prediction Market Corruption Act" from Senators Merkley and Klobuchar would bar top officials and families from trading on prediction platforms, imposing fines and profit clawbacks

Notably, these bills lack Republican co-sponsors, signaling uncertain passage prospects.