Bab el-Mandeb Strait effectively closed by 2026?

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Market context

Houthi attacks on shipping in the Bab el-Mandeb Strait have persisted for over a year, yet transit volumes have remained resilient despite periodic disruptions. The 7-day moving average of vessel arrivals has not fallen below 10 calls per day since operations resumed following earlier blockade attempts, suggesting either sufficient rerouting capacity or sufficient risk tolerance among operators to maintain baseline traffic. Recent weeks have seen no material escalation in attack frequency or success rates that would suggest an imminent shift toward sustained closure conditions.

Historical precedent offers limited guidance here. The Suez Canal blockage in March 2021 created a binary disruption event, whereas the Bab el-Mandeb situation has evolved as a grinding campaign of sporadic strikes. Previous Houthi operations have not achieved sustained transit reductions below the 10-call threshold despite months of activity. The threshold itself—roughly 70% below peak pre-conflict levels—represents a severe closure scenario rather than operational disruption.

Traders monitoring this market should track Houthi capability announcements, particularly claims of new drone or missile systems, and any statements from shipping insurers or major carriers about route abandonment. Port authority data releases and IMF PortWatch publication schedules determine resolution timing. The April 2026 deadline provides 18 months for conditions to shift materially, though the current 0% probability reflects market assessment that neither a sudden escalation nor sustained campaign intensity sufficient to breach the 10-call threshold is likely within that window.

Methodology

We track Bab el-Mandeb Strait effectively closed by 2026? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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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.

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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.