IRGC fires on vessel in Strait of Hormuz, UK warship passage seen as unlikely

The Islamic Revolutionary Guard Corps (IRGC) opened fire on a vessel in the Strait of Hormuz, reasserting control over the waterway. The market on whether the UK will send warships through the strait by April 30, 2026, has dropped to 8.5% YES, down from 12% just 24 hours ago.

The IRGC firing makes it less likely the UK risks sending warships into an active confrontation zone. The market has fallen 3.5 percentage points in a day, with traders pricing in reduced chances of safe passage.

Daily trading volume is at $1,412 in USDC, with a cost of $304 to move the market by 5 points. This is a thin market where a single large order can swing the odds meaningfully. The largest move in the past 24 hours was a 2-point spike at 4:25 PM, suggesting some traders briefly bet on escalation before the odds settled back down.

Iran is using the Strait of Hormuz to deter foreign military presence. At 8.5¢, a YES position pays 11.76x if the UK decides to challenge Iran’s control. The asymmetry is large, but the IRGC’s willingness to fire on vessels explains why the market is pricing passage as unlikely.

Specific triggers to watch: statements from the UK Ministry of Defence, any Royal Navy movements toward the Persian Gulf, or shifts in diplomatic talks involving President Macron or Sultan Al Jaber. Any of these could move this thin market sharply.

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