Bab el-Mandeb Strait effectively closed by 2026?

Platform comparison

Market context

The Bab el-Mandeb Strait remains one of the world’s most critical shipping chokepoints, linking the Red Sea to the Indian Ocean and facilitating roughly 10% of global maritime trade. Despite recent geopolitical tensions, including Iran’s threats to suspend peace talks and restrict traffic, the 7-day moving average of ship transit calls stood at 35.14 on 28 June 2026, far above the 10-ship threshold required for this market to resolve “Yes”[3]. With current crowd-implied probability at 0% and settlement window ending mid-2026, the market reflects strong confidence that transit volumes will not collapse to near-zero levels.

Historically, the strait has seen sharp but temporary dips during regional crises; for instance, during the Red Sea Crisis, daily averages fell to 15.34, yet never approached the 10-ship closure level[7]. Comparable chokepoints like the Cape of Good Hope maintained higher baselines even under disruption, suggesting that a full closure would require unprecedented escalation beyond current rhetoric. This context frames the 0% probability as rational, given that even severe disruptions have not previously triggered such a threshold.

Traders should monitor upcoming announcements from the IMF PortWatch, scheduled Red Sea security updates, and any shifts in Iran’s foreign policy stance, as these could act as catalysts for sudden volume changes. Recent reporting notes Brent oil prices spiking amid closure threats, indicating market sensitivity to escalation[4]. However, with no data published below 10 since market creation and current transit levels stable, the divergence between prediction-market implied probability and analyst consensus remains minimal, reinforcing the view that a closure is highly improbable before the settlement deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.