Bab el-Mandeb Strait effectively closed by 2026?

Platform comparison

Market context

The Bab el-Mandeb Strait, connecting the Red Sea to the Gulf of Aden, has experienced significant disruption since late 2023 due to Houthi attacks on commercial shipping. This market resolves affirmatively only if IMF PortWatch records a 7-day moving average of vessel transits at 10 or fewer—a threshold representing roughly 85–90% reduction from pre-conflict baseline levels of 60–80 daily transits. The settlement mechanism ties directly to published data rather than geopolitical declarations, meaning a "closure" is defined operationally by shipping traffic collapse rather than formal blockade announcements.

Historical precedent suggests such extreme transit reductions are difficult to sustain. The 2011 Suez Canal closure saw transits drop to zero for eight days; the 1967 closure lasted eight years but involved formal state action and international law. Houthi disruption, by contrast, has proven episodic—attacks intensify and subside with tactical shifts, ceasefire negotiations, and international naval presence. Current transit volumes remain substantially above the 10-call threshold despite ongoing incidents, with recent weeks showing 40–50 daily transits according to shipping data aggregators.

Traders monitoring this market should track: IMF PortWatch publication schedules (typically weekly); Houthi military capability statements and claimed attack success rates; US and allied naval deployment announcements; and ceasefire negotiations involving Saudi Arabia or UN intermediaries. Programmatic approaches would require automated feeds from PortWatch data releases and conditional logic triggering alerts when 7-day averages approach the threshold. The 0% crowd probability reflects the high bar set by the 10-call definition—sustained near-total closure rather than elevated disruption risk.

Methodology

We track Bab el-Mandeb Strait effectively closed by 2026? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.