The market for a US declaration of war on Iran by December 31, 2026, is at 7.5% YES, down slightly from 8% a week ago, as the US-Israel-Iran conflict continues without triggering a formal Congressional response.
Market reaction
The April 30 market sits at 0.4% YES, showing traders see almost no chance of a near-term declaration. The biggest jump in the term structure is between April 30 and December 31, from 0.4% to 7.5%, which suggests traders price in a potential catalyst later in the year rather than anything imminent.
Trading activity is modest: $314 in daily USDC volume. It takes $4,248 to move the price by 5 percentage points, making this a thin market where a single large order could cause significant swings. The largest recent movement was a 1-point shift.
Why it matters
The conflict has disrupted the Strait of Hormuz and pushed oil prices higher, but the economic fallout has not translated into war declaration odds moving meaningfully. The gap between real-world military activity and the flat trajectory of this market suggests traders see the current escalation as economic, not a precursor to a formal Congressional war declaration.
What to watch
Congressional activity is the key variable: scheduled votes, statements from President Trump or Secretary of War Pete Hegseth, and any changes in US military posture in the Persian Gulf. For traders, buying YES at 7.5¢ pays $1 if Congress declares war, a 13.3x return. That bet requires believing diplomatic and economic pressure will fail and that Congress will take the rare step of a formal declaration.
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Will The Us Officially Declare War On Iran| Contract | Odds | Δ since publish | Volume 24h | |
|---|---|---|---|---|
| December 31, 2026 | 7.5% | — | — | Trade → |
| April 30, 2026 | 0.4% | — | — | Trade → |
| Contract | Odds | Δ since publish | Volume 24h | |
|---|---|---|---|---|
| June 30 | 6.5% | — | — | Trade → |
| December 31 | 13.5% | — | — | Trade → |
