- Polymarket’s Iran invasion odds sit at 36% after Iran fully closed the Strait of Hormuz and fired on two ships on April 18.
- Over $1 billion in prediction market bets tied to the Iran conflict have drawn congressional investigations into insider trading.
- The market has processed $12.6 million in volume since launching in November 2025, with odds spiking 9% in 24 hours this week.
Iran fully closed the Strait of Hormuz on Saturday, firing on at least two commercial vessels and declaring the waterway shut until the U.S. lifts its naval blockade. The move pushed Polymarket’s “Will the U.S. invade Iran before 2027?” contract to 36% odds for “Yes”—up from 27% just 48 hours earlier. Over $12.6 million has now traded on the market since it launched in November 2025.
The closure marks the sharpest escalation since U.S.-Israel airstrikes on February 28 killed Iran’s Supreme Leader Ali Khamenei and targeted nuclear and missile facilities across the country. The U.S. responded by deploying over 10,000 Marines, 82nd Airborne troops, and multiple carrier strike groups to the region, enforcing a naval blockade of Iranian ports. A two-week ceasefire agreed April 8 after talks in Islamabad briefly cooled tensions—but it partially collapsed on April 12.
What’s made this conflict uniquely strange is the betting. Traders have placed over $1 billion in bets on Polymarket contracts tied to the Iran war, and NPR reported that lawmakers are now demanding investigations into whether some of those wagers came from people with advance knowledge of military operations. A Bloomberg study found roughly $143 million in profits across Polymarket that fit patterns “consistent with the use of nonpublic information.”
Why Prediction Market Bets on War Are Drawing Federal Heat
The insider trading question isn’t theoretical. On February 28—just hours before the U.S.-Israel strikes began—six newly created Polymarket accounts placed highly specific bets on the timing of an attack. reported those accounts collectively profited around $1 million. A separate anonymous trader reportedly made $553,000 betting on Khamenei’s death, according to NPR.
The pattern repeated during the April 7 ceasefire. New accounts appeared days before the agreement was announced, placing concentrated bets that resulted in hundreds of thousands in profits. The Associated Press first documented the suspicious timing. By April 10, the White House had sent a staff-wide email telling employees not to place bets on prediction markets related to the conflict.
The controversy has crossed into something darker. A Times of Israel military correspondent reported receiving death threats from Polymarket gamblers who would profit if he changed his reporting on an Iranian missile’s impact in Israel. The incident exposed a structural problem: when betting odds depend on real-time journalism, the journalists themselves become targets.
The $12.6 Million Question: Does Polymarket Predict Anything, or Just Profit?
Polymarket’s defenders argue the platform aggregates crowd wisdom faster than traditional media. With $12.6 million traded on the invasion contract alone, the market draws on thousands of participants—some military analysts, some geopolitical bettors, some possibly insiders. The resulting odds, they claim, reflect genuine collective intelligence about the probability of a ground invasion.
The counterargument is simpler: $143 million in suspicious profits suggests the “crowd” includes people trading on classified information. The CFTC has proposed rules barring regulated exchanges from listing event contracts tied to war, terrorism, and assassination. Congress has introduced bipartisan legislation targeting both Polymarket and Kalshi. And the White House already told its own staff to stop betting on the war.
For now, the invasion market sits at 36% “Yes”—meaning the crowd thinks there’s roughly a one-in-three chance of a full-scale U.S. ground invasion before 2027. The trader consensus leans toward “No” at 65.5%, driven by ongoing diplomatic channels, the high cost of invasion, and congressional war powers scrutiny. But with Iran now firing on ships in the Strait of Hormuz and two carrier strike groups sitting offshore, the odds could move fast.
The market resolves December 31, 2026.