Iran prioritizes ships paying security fees in Strait of Hormuz

Iran announced it will prioritize ships paying “costs of security” in the Strait of Hormuz, and the Polymarket contract on fewer than 10 ships transiting between April 13-19 sits at 0.4% YES.

Market reaction

The low odds reflect skepticism about Iran’s ability to enforce such restrictive measures. But the contract is extremely thin: only $14 in real USDC trades daily, and $12 is enough to move the odds 5 points. The largest move in the past day was a 2-point spike at 4:25 AM, likely from a single small order. One trader can move this market on their own.

Why it matters

Iran frames the fee as a defense measure. The US and its allies consider it illegal. Daily ship traffic through the strait has already dropped from 138 ships to 5-8. The market prices in almost no chance of transit falling below 10 ships by April 19, but the contract’s thin liquidity means that pricing carries little informational weight.

What to watch

At 0.4¢, a YES share pays $1 if fewer than 10 ships transit, a 250x return. Buying YES is a bet on strict Iranian enforcement and no diplomatic progress within the next day. Official statements from CENTCOM or the Iranian government, or any shift in military posture or diplomatic talks, could move the odds quickly given how little volume it takes.

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