Bab el-Mandeb Strait effectively closed by 2026?

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Market context

The Bab el-Mandeb Strait, the narrow waterway between Yemen and the Horn of Africa, remains a critical chokepoint for global shipping. Houthi attacks on commercial vessels since late 2023 have disrupted transit patterns, yet the 7-day moving average of arrivals has not fallen to 10 or below according to IMF PortWatch data. Polymarket currently prices a YES resolution at 0%, reflecting trader confidence that even under sustained Houthi pressure, the strait will not experience a near-total closure meeting the market's specific threshold before April 2026.

Historical precedent matters here. The Suez Canal blockage in March 2021, when Ever Given ran aground, saw dramatic rerouting but not a permanent shutdown of the region's maritime infrastructure. Houthi operations, whilst disruptive, have not yet achieved the scale or consistency required to reduce weekly transits below 10 vessels. Shipping companies have adapted through convoy systems, insurance adjustments, and selective rerouting rather than wholesale abandonment of the passage. The 0% pricing suggests traders view a near-total closure as structurally unlikely given alternative routes and the economic incentives maintaining some level of traffic.

Traders monitoring this contract should track IMF PortWatch publication schedules closely, as the market's resolution hinges entirely on that data source. Escalations in Houthi capability—particularly if they deploy new weapons systems or coordinate larger-scale attacks—could theoretically shift probabilities, though the threshold of 10 or fewer weekly transits remains a high bar. Announcements from major shipping insurers regarding premium changes or route restrictions, alongside any significant vessel losses, would signal material shifts in market conditions worth pricing in.

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.