Bab el-Mandeb Strait effectively closed by 2026?

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Market context

The Bab el-Mandeb Strait, a 33-kilometre chokepoint between Yemen and Djibouti, has experienced sustained disruption since late 2023 as Houthi forces launched attacks on commercial shipping. The market resolves YES only if the IMF PortWatch 7-day moving average of transit calls drops to 10 or below—a threshold representing roughly 85% reduction from pre-disruption baseline levels of 60–80 daily transits. Currently priced at 0% on Polymarket, the conditional YES token trades at negligible value on Polygon, reflecting trader consensus that even under intensified Houthi operations, sufficient vessels continue routing through the strait to keep the average above the settlement threshold.

Historical precedent suggests closure to this degree requires either a dramatic escalation in attack frequency or a coordinated international response that effectively halts traffic. The 2011 Suez Canal blockage and 2022 Russia–Ukraine shipping disruptions both saw significant rerouting but rarely achieved single-digit daily transits in major chokepoints; most commercial operators accept elevated insurance costs rather than abandon critical routes entirely. Current Houthi capability, whilst operationally disruptive, has not yet forced the systematic abandonment that would compress transit calls below 10 per day.

Traders monitoring this contract should track announcements from the US Central Command regarding military operations in the Red Sea, shipping insurance premium movements, and IMF PortWatch data releases themselves—the latter published irregularly and sometimes with lags. Any major escalation in Houthi drone or missile attacks, combined with insurance market dysfunction, could theoretically trigger the threshold, but the 0% pricing reflects the structural difficulty of achieving near-total closure whilst maintaining the data publication schedule through April 2026.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket UK, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does it cost to trade on Polymarket UK?

Zero. Polymarket UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.