Iran successfully targets shipping on August 21, 2026?

Thesis

• Specific-day binary markets on rare kinetic events carry a structurally low base rate; a YES requires an attack to both occur and be confirmed within one 24-hour window, which historically clusters into a handful of days per year even in active crises.
• Signal vs. narrative: the mere existence of this market implies elevated Iran tensions in August 2026 (plausibly an active or recently paused conflict), which justifies a meaningful lift above the peacetime per-day rate of ~1%, but no confirmed scheduled provocation is knowable from here, so the lift should be modest, not dramatic.
• The market's 11.5% is only $114 of 24h volume, so it is likely stale or noise-driven rather than informed; my independent 8% is close enough that the small divergence is best explained by thin liquidity plus a slight retail overpricing of salient geopolitical risk.
• Time-decay is not a major factor with 5 days to close, but the absence of any imminent deadline-driven trigger (e.g., a sanctions snapback date or ultimatum expiring exactly on Aug 21) argues against a spike on that specific day.

Base rate

Even during peak Iran-Gulf tensions (e.g., the 2019 tanker campaign), successful attacks on shipping occurred on well under 5% of individual days, and multi-week gaps between incidents were the norm.

What would prove this wrong

A credible report in the next 1-4 days of Iran explicitly threatening or commencing closure/interdiction operations in the Strait of Hormuz, or a new strike exchange with the US/Israel, would push my estimate toward 25-40%.

Settlement

Resolved NO on 21 Aug 2026 · settlement source