Will Iran Close the Strait of Hormuz by December 31?

The December 31 deadline contract for an Iranian Strait of Hormuz closure has hit 100% implied probability. That number demands explanation, not celebration. At 100%, the market has essentially closed the question of whether this resolves YES before year-end. The real question now is what events between today and December 31 could crack that consensus.

The Will Iran close the Strait of Hormuz by December 31? contract trades at $1.00 YES and $0.00 NO. With $69,563,338 in total volume and $11,900,681 in available liquidity, this is one of the most heavily capitalized geopolitical contracts on Polymarket right now. The resolution date is December 31, 2026.

How the Iran Hormuz Closure Contract Works

This contract resolves YES if Iran executes a verified closure of the Strait of Hormuz before December 31, 2026. Resolution depends on market adjudication against credible reporting. A NO resolution requires Iran to have taken no such action by that deadline.

• YES: Iran closes the Strait of Hormuz. Price: $1.00. Probability: 100%. Resolves: December 31, 2026.
• NO: Iran does not close the Strait of Hormuz. Price: $0.00. Probability: 0%. Resolves: December 31, 2026.

A NO buyer needs Iran to back down from any closure action through the entire year. That means sustained de-escalation across U.S.-Iran relations, no major military confrontation, and no economic crisis severe enough to force Iran’s hand in the Strait. At current pricing, the market assigns NO essentially zero chance. Any credible de-escalation signal, a nuclear deal, diplomatic back-channel, or Iranian domestic stabilization, could be the only scenario that moves NO off the floor.

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Market Signals: Volume and Momentum at the Ceiling

The Iran Hormuz contract shows flat momentum across the one-hour and 24-hour windows, both at +0.0% price change, with a trend score reflecting a market already pinned at its ceiling. The math doesn’t lie: when a contract hits $1.00, price movement stops. What matters now is whether selling pressure emerges.

The $69,563,338 in total volume and $9,390,833 traded in the past 24 hours signal genuine conviction, not a thin market with an inflated price. The $11,900,681 in liquidity means traders can exit or enter large positions. That’s real capital behind a real thesis.

• YES price: $1.00, implying 100% probability as of April 1, 2026. No upside room remains.
• NO price: $0.00. Any move off zero would signal the first major market doubt.
• 24-hour price change: +0.0% and one-hour change +0.0%, consistent with a ceiling-locked contract.
• 24-hour volume: $9,390,833. High volume at the ceiling confirms sustained directional commitment, not stale pricing.
• Related market context: China-Taiwan invasion sits at 10% and a Russia-Ukraine ceasefire by year-end at 30%, both via Polymarket as of April 1, 2026. Iran Hormuz at 100% stands apart from the rest of the geopolitical risk board.

Lines Analysis: Iran Hormuz Closure Conviction

The case for YES is the market itself. A $69,563,338 pool does not accumulate around a speculative fluke. The contract has drawn sustained capital through what the price history shows was a significant climb from the $0.37 opening price. Traders pushed this from below 40 cents to $1.00, absorbing all available NO-side liquidity along the way. That trajectory reflects a market that priced in escalating Iran-U.S. tension progressively, not in a single spike.

Here’s what the market is missing: a 100% price is a claim, not a fact. The NO side currently prices at zero, meaning the market sees no scenario where Iran avoids a Hormuz closure through December 31. That is an extraordinary statement about a nine-month window. A diplomatic breakthrough, an Iranian leadership shift, or a U.S. policy reversal could inject real NO value fast. The $0.00 NO price is the single most vulnerable data point in this entire market.

• U.S.-Iran nuclear negotiations: Any resumed talks would push NO price above zero immediately.
• Iranian domestic politics: A change in Iranian government posture toward the West could erode YES conviction before June.
• Regional military escalation: A direct U.S. or Israeli strike on Iran would likely accelerate YES to resolution.
• Oil price volatility: A sharp drop in global oil prices reduces Iran’s leverage and its incentive to threaten the Strait.
• Competing contracts: The U.S. strike on Mexico market at 20% via Polymarket suggests traders are pricing multi-front risk. Escalation in one theater could delay or trigger Hormuz action.

The synthesis here is simple. Total volume of $69,563,338 is not thin-market noise. Traders have committed real capital to YES across months of price movement. The data favors YES holding through resolution, barring a diplomatic shock. The single catalyst that could move this market is a credible de-escalation signal from Tehran or Washington before summer 2026.

LINES VERDICT

YES Holds Barring Diplomatic Shock

The market has priced Iran Hormuz closure as a near-done deal, and the volume behind that price is too large to dismiss as noise. Only a concrete diplomatic development before mid-year realistically cracks this consensus.

What the market says: The contract sits at roughly certain YES, with $69,563,338 in total volume backing that read. Watch the December 31, 2026 resolution date: nine months is a long window, and the NO price at zero is the only fragile number left in this market.