Bab el-Mandeb Strait effectively closed by 2026?

Platform comparison

Market context

The real-world event here is not a legal declaration of closure, but whether ships are actually moving through the Bab al-Mandeb in such low numbers that IMF PortWatch’s 7-day average of transit calls falls to 10 or fewer. For traders, a **YES** share pays if that published average reaches the threshold on any date before the deadline; a **NO** share pays if it never does. That means the market is tracking observed shipping traffic, not rhetoric, and a single day of headlines is not enough unless it shows up in the PortWatch data.

This is a chokepoint market, so the right comparison is with past disruption that *reduced* traffic without fully stopping it. Bab al-Mandeb is a narrow route linking the Red Sea and the Gulf of Aden, and it has already seen periods of severe tension as Houthi threats and attacks pushed some vessels to reroute around the Cape of Good Hope.[2][15] Reuters reported in mid-July that Iran was signalling it could use its Houthi allies to pressure the strait, while other reporting said the Houthis had threatened an embargo and warned the passage could be closed.[4][5] Even so, the more common outcome in comparable episodes has been partial disruption rather than a complete stoppage, which helps explain why a 0% implied probability can persist if the market expects traffic to stay above the settlement threshold.[8][9]

What matters most now is whether threats turn into operational restrictions and whether shipping lines respond by avoiding the route long enough for the 7-day average to sink. Watch for new Houthi statements, any US or regional maritime advisories, and signs of rerouting in vessel-tracking data; Reuters noted recent Iran-linked signalling around the strait, and earlier US warnings followed Houthi threats to vessels in the area.[4][15] Because the contract settles on published IMF PortWatch data, the key dependency is not just whether an incident occurs, but whether enough transits are interrupted, for long enough, to be reflected in the rolling average.

Sources: 1 · 2 · 3 · 4 · 5

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

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

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 Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK 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.