US strikes Iran; Polymarket lifts Dec. 31 nuclear deal odds to 54%

US Strikes Iran After Strait of Hormuz Drone Attack as Polymarket Odds Jump for a US-Iran Nuclear Deal by Dec. 31, 2026

The U.S. struck Iran after a drone attack hit a cargo ship in the Strait of Hormuz that President Donald Trump said violated a ceasefire, escalating a fragile interim understanding between the two countries. On Polymarket, traders sharply raised the implied chance of a US-Iran final nuclear deal by December 31, 2026.

Key Takeaways

• Polymarket prices a 54.0% chance of a US-Iran final nuclear deal by December 31, 2026 (Yes 54.0% / No 46.0%).
• Odds rose as U.S. strikes on Iran followed a ship attack Trump blamed on Iran, testing a ceasefire tied to an interim understanding.
• The contract’s resolution date is August 31, 2026, while the leading ladder strike is December 31, 2026.

The United States struck Iran on Friday after a drone attack a day earlier hit a cargo ship in the Strait of Hormuz, an incident President Donald Trump blamed on Iran and described as a ceasefire violation. The action tested an interim understanding reached about a week earlier as the two countries began working to end months of fighting and reopen the strategic waterway. U.S. Central Command said the military targeted missile and drone locations and coastal radar sites in Iran, and a U.S. official said the strikes concluded about an hour after the announcement. Trump told reporters shortly before the action that multiple shots had been fired the previous day, and he cut off questions when asked why strikes would occur while talks were said to be going well. Iran’s Ebrahim Azizi, who heads parliament’s national security commission, said the strait is governed by Iran and characterized the situation as “ceasefire management,” not a violation.

Polymarket Data: $2.44M Volume and Yes 54.0% (Up From 25.5%) on “US-Iran Final Nuclear Deal by Dec. 31, 2026”

Polymarket’s ladder market “US-Iran Final Nuclear Deal by…?” shows the December 31 strike as the top line, with Yes at 54.0% and No at 46.0%, up from 25.5% previously for that leading outcome. Shorter-dated strikes remain priced much lower: August 31 is Yes 25.5% / No 74.5%, September 30 is Yes 32.5% / No 67.5%, and June 30 is Yes 0.2% / No 99.8%. The market has traded about $2,444,261 in volume, and the 24-hour move is +29.5 percentage points, signaling a rapid repricing toward a later-2026 deal rather than an imminent agreement.

Whether Polymarket pricing continues to concentrate on late-2026 timing, and how liquidity shifts between the September 30 and December 31 strikes ahead of the Aug. 31, 2026 resolution date.

Beyond the Nuclear Deal: Other High-Volume Geopolitical and Macro Polymarket Contracts Traders Are Watching

Elsewhere on Polymarket, traders are clustering into operational and regime-risk contracts tied to the Gulf, alongside more granular shipping-flow gauges. “Will the Iranian regime fall by June 30?” implies a 99.85% probability of No on $64,644,863 in volume, while “Strait of Hormuz traffic returns to normal by end of June?” sits at 94.65% No with $37,734,546 traded. Timelines remain contested further out, with “Strait of Hormuz traffic returns to normal by July 31?” pricing 52.5% No on $10,016,760, and the more micro measure “Will __ ships transit the Strait of Hormuz on any day by June 30?” showing 100.0% for “20+” on $2,957,452.

Odds Trend

By the Numbers

• Platform: Polymarket
• Market: US-Iran Final Nuclear Deal by…?
• Contract type: Price strike ladder: each rung has separate Yes/No; Yes means the spot price is above that USD strike at settlement.
• Resolution window: Aug 31, 2026 (UTC)
• Status: Active (open for trading)
• Volume: ~$2,444,261

Top strike rungs

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Sources

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