Polymarket

Strait of Hormuz: Polymarket Odds Soar to Near Certainty Amid De Facto Closure

A Polymarket prediction market on the closure of the Strait of Hormuz by March 31, 2026, is pricing a near 100% probability of 'Yes,' reflecting the current reality of severely restricted maritime traffic following recent escalations in the US-Iran conflict.

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— 4 min read

The prediction market on Polymarket, asking "Will Iran close the Strait of Hormuz by March 31?", is signaling a near-certain outcome, with current prices indicating a 99.95% probability for a "Yes" resolution. This reflects the grim reality that the critical global chokepoint has been effectively closed or severely restricted since late February 2026, following a dramatic escalation of geopolitical tensions in the Middle East.

Market Question and Significance

The market question centers on whether Iran will halt or severely restrict international maritime traffic through the Strait of Hormuz by March 31, 2026. This market holds immense global significance, as the Strait of Hormuz is arguably the world's most vital energy chokepoint. Approximately 20-25% of the world's daily oil supply and a substantial portion of liquefied natural gas (LNG) transit this narrow waterway, connecting the Persian Gulf to the Indian Ocean. A sustained closure or severe restriction directly threatens global energy security, supply chains, and could trigger widespread inflation.

Key Recent Developments

The current situation stems from a series of events that began on February 28, 2026, with joint military strikes by the United States and Israel on Iran. In retaliation, Iran launched missile and drone attacks on US military bases, Israeli territory, and other Gulf states. Crucially, Iran's Islamic Revolutionary Guard Corps (IRGC) issued warnings prohibiting vessel passage through the strait, leading to an immediate and effective halt in shipping traffic.

Since then, multiple commercial vessels have been struck by drones, missiles, or projectiles in and around the Strait of Hormuz and the wider Persian Gulf, resulting in casualties and damage. As of early March, vessel tracking data showed a drastic reduction in traffic, with hundreds of ships anchoring outside the strait to avoid risks. Major shipping companies, including Maersk, CMA CGM, and Hapag-Lloyd, have suspended transits, and war-risk insurance has become prohibitively expensive or unavailable. Reports on March 13, 2026, even indicate that Iran has begun laying mines in the Strait of Hormuz, further escalating the threat, a claim Iran has denied.

Iran's new Supreme Leader, Mojtaba Khamenei, has publicly stated that the "lever of blocking the Strait of Hormuz must continue to be used" as a tool to pressure adversaries. This firm stance underscores Iran's commitment to maintaining pressure on the vital waterway. Saudi Aramco has warned that ongoing disruptions could threaten 20% of global crude oil supply, risking substantial price volatility and a potential crisis.

Market Odds and Implications

The Polymarket odds, with "Yes" at $0.9995 and "No" at $0.0005, clearly reflect the consensus that Iran has already, in practice, halted or severely restricted international maritime traffic through the Strait of Hormuz. This extreme probability indicates that traders believe the conditions for a "Yes" resolution have been met well before the March 31 deadline. This contrasts with earlier probabilities reported in early March, where the chance of closure by year-end 2026 was around 70-85%.

The market's high confidence is justified by the overwhelming evidence of disrupted shipping, direct threats, and kinetic attacks on vessels. The de facto closure has already sent oil and gas prices surging, with Brent crude surpassing $100 per barrel. Despite calls for naval escorts, US officials have acknowledged that they are not yet ready to provide them, highlighting the significant risks posed by Iranian drones, missiles, and sea mines.

Expert Opinions and Data Points

Experts from organizations like UNCTAD and CSIS emphasize the vulnerability of critical maritime chokepoints and the widespread economic shocks resulting from such disruptions. Data from Kpler indicates that while Iran continues to export some oil, primarily to China, the wider crisis has forced nations to tap emergency reserves. The ongoing situation suggests that the economic damage of the conflict is already considerable, with long-term implications for global trade and energy markets.

Given the current geopolitical climate and the tangible impact on shipping, the market's near-unanimous expectation for a "Yes" resolution appears to be well-founded, signaling that Iran has indeed achieved a severe restriction of traffic through the Strait of Hormuz by the specified deadline.

Sources:

Market data fetched at 2026-03-13 12:15 UTC | Polymarket ID: 1227361

This article is generated by AI for informational purposes only. It does not constitute financial advice. Always do your own research before making any investment decisions. Data sourced from Polymarket and public web sources.

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