US confirms six ships turned back amid Iran port blockade

The US military confirmed that six merchant ships were turned around during the current blockade of Iran’s ports, with no vessels successfully crossing. The market on whether Trump will announce the blockade is lifted by May 31 sits at 84% YES, suggesting traders see little chance of a near-term resolution.

Market reaction

Active enforcement has direct implications for markets predicting allied naval deployments through the Strait. The probability of the UK sending warships by April 30 is at 10% YES, up from 6% a week ago. That modest move suggests a slight increase in expectations for international naval involvement, possibly as a freedom of navigation exercise.

The market for an earlier lifting of the blockade is more skeptical. Odds for an announcement by April 15 are at 6% YES, with April 17 at 12% YES. The term structure shows a large jump between April 19 and May 31, meaning traders expect any resolution to come in late May rather than sooner.

Why it matters

Trading volume across the blockade market totals $157,908 in face value over the past 24 hours, with $19,947 in actual USDC. It takes $3,518 to move the May 31 odds by five percentage points, which gives a concrete sense of order book depth and trader conviction.

The firm enforcement signals that the US is committed to maintaining pressure on Iran in the short term. The concentration of probability in the late-May window rather than mid-April suggests traders are pricing in a drawn-out standoff before any diplomatic off-ramp materializes.

What to watch

Watch for naval movements by the UK and France, and for statements from Trump and IRGC officials. Any of these could shift expectations for both military escalation and diplomatic resolution. A YES share on the May 31 market at 84¢ pays $1 if Trump announces the blockade is lifted, a 1.19x return. That bet assumes de-escalation efforts gain traction, possibly driven by diplomatic pressure.

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