Iran closes Strait of Hormuz, impacting global oil supply

The Iran conflict has pushed crude oil supply concerns back into focus, with the “Crude Oil all time high by April 30” market on Polymarket sitting at 1.2% YES, up from 1% yesterday.

Market reaction

The shift is small. With Brent crude already above $120/barrel, traders are pricing in whether prices could exceed historic highs before month’s end. The 1.2% YES suggests most participants don’t think it will happen. Actual USDC traded is just $2,513 against a face value of $100,828, meaning this is a thin market where a $695 order could swing the odds by five points. The largest recent move was a 1-point spike.

Why it matters

Iran’s closure of the Strait of Hormuz has halted a significant portion of global oil flows, creating a real supply-side shock. But the market is pricing in the possibility that this disruption gets resolved or offset before prices reach a new all-time high. At 1.2¢ per YES share, a correct bet pays $1, an 83.3x return. That payout ratio reflects how unlikely traders consider a new peak by April 30, likely because potential peace talks or strategic petroleum releases could bring prices back down.

What to watch

OPEC+ meetings and any announcements from the White House regarding strategic petroleum reserves are the most likely catalysts that could move these odds. Any breakdown in diplomatic channels with Iran would push odds higher; any credible de-escalation would keep them pinned near where they are.

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