Iran closes Strait of Hormuz, fires on tankers amid US blockade standoff

Iran announced the closure of the Strait of Hormuz, conditioning its reopening on the lifting of Trump’s blockade. The market for Trump announcing the end of the blockade by May 31, 2026, sits at 82% YES, unchanged from 24 hours ago.

Market reaction

Iran has fired on civilian tankers, adding a military dimension to the standoff. The market for Trump lifting the blockade by April 19 is at 12% YES, down steeply from previous levels. That deadline is just three days away, and the order book is thin: only $257 in depth is needed to move the odds by 5 points.

The May 31 market trades $5,927 in daily USDC volume, suggesting moderate confidence that the blockade lifts by then. The April 17 sub-market is effectively dead at 8.5%, down 4 points, as traders price in almost no chance of near-term resolution.

Why it matters

This is a real escalation. Iran’s military actions and rhetoric signal no progress in talks. The combination of live fire on civilian vessels and a formal closure announcement makes a quick diplomatic resolution less likely, not more. Traders should be cautious about betting on the blockade lifting soon.

What to watch

A YES share at 17.5¢ for April 19 pays $1 if Trump announces the blockade lift by then, a potential 5.7x return. But that bet requires believing a diplomatic breakthrough happens within three days. Watch for statements from the U.S. Navy, Trump’s social media posts, or any movement in the ongoing US-Iran indirect talks. Any of these could move the market fast.

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