Bab el-Mandeb Strait effectively closed by 2026?

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Active sub-markets

Market context

The Bab el-Mandeb Strait, a 33-kilometre chokepoint between Yemen and Djibouti, handles roughly 12–15% of global maritime traffic under normal conditions. This market settles affirmatively only if IMF PortWatch records a seven-day moving average of vessel arrivals at or below 10 transits per day—a threshold representing an 85% reduction from baseline. Since Houthi attacks on shipping intensified in October 2023, transit volumes have declined but have not approached the settlement threshold; even at the height of disruption, daily averages remained in the low-to-mid 20s. The 0% crowd probability reflects the historical resilience of the corridor: whilst individual vessels have been targeted and some operators have rerouted via the Cape of Good Hope, sufficient traffic has persisted to maintain double-digit daily averages.

Traders monitoring this market programmatically should track IMF PortWatch releases directly rather than relying on secondary reporting, as the seven-day moving average is the sole arbiter. Watch for escalation patterns: a sustained campaign targeting multiple vessel types simultaneously, coupled with successful strikes on key chokepoint infrastructure (port facilities, navigational aids), would be the primary catalyst. Recent reporting from January 2025 indicates Houthi capability remains limited to relatively small-scale attacks; a material shift in targeting sophistication or frequency would warrant reassessment. The settlement window extends to April 2026, allowing 16 months for conditions to shift, though the current trajectory suggests the threshold remains structurally unlikely absent a dramatic operational escalation or coordinated blockade attempt.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket App UK?

Zero. Polymarket App 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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.