Iran threatens to close Strait of Hormuz amid US tensions

Iran’s naval commander has threatened to close the Strait of Hormuz and take “swift action” against US forces. The odds of a US-Iran ceasefire by April 30 sit at 0.9% YES, down from 3% yesterday.

Market reaction

This drop hits the US-Iran ceasefire market, which was already trending lower. With one day until resolution, Iran’s aggressive posture leaves almost no room for a YES outcome. The next US-Iran diplomatic meeting market moved sharply too: “no qualifying meeting by June 30” is priced at 30.8% YES, up from 16% yesterday. That 15-point jump means traders now see meaningfully lower chances of talks happening by June 30.

Why it matters

Actual USDC volume on the ceasefire market is $17,092 daily, with just $1,875 needed to move prices 5 percentage points. The market is thin and vulnerable to large single trades. The diplomatic meeting market trades $3,252 in actual USDC daily, with $603 required to shift odds 5 points, a slightly deeper book but still easy to move.

What to watch

For traders, this is a high-risk, near-expiry situation. At 0.9¢, a YES share on a ceasefire pays $1 if it resolves positively, a payout ratio that prices the probability at near zero. The diplomatic meeting odds, while higher, face pressure from Iran’s current rhetoric.

Watch for official statements from CENTCOM or diplomatic signals through Oman or Qatar. Either could produce last-minute market moves if there’s any shift toward de-escalation or scheduled talks.

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