Bab el-Mandeb Strait effectively closed by 2026?

Platform comparison

Market context

Polymarket has this contract at **0% YES**, so the market is pricing in virtually no chance that IMF PortWatch will publish a 7-day moving average of **10 or fewer ship arrivals** for the Bab el-Mandeb Strait before expiry. The on-chain position is a standard conditional token settled in **USDC on Polygon**, with the outcome tied not to headlines but to the PortWatch series itself; that means a trader is really buying or selling the risk of a published traffic collapse, not merely the risk of tension in the Red Sea.

The historical read-through is that Bab el-Mandeb has faced repeated threat cycles without consistently reaching a full statistical shutdown. Recent reporting has described fresh Houthi threats against the strait, while earlier commentary noted shipping still continued through the waterway and that a complete blockade had not yet materialised.[1][3] That helps explain why the market can stay pinned near zero: unless traffic falls sharply and stays there in the IMF series, rhetoric alone does not settle the contract. Comparable warnings have also come from Iranian and Houthi-linked sources over the past year, but those statements have often signalled leverage rather than verified closure.[6][7][9]

A Polymarket user should watch three things: any Houthi announcement that is specific about enforcement, any escalation involving Saudi, US, or Israeli assets that could change routing behaviour, and the timing of IMF PortWatch updates, since the market resolves as soon as a qualifying 7-day average appears or the relevant data window closes without one. Reuters reported on 16 July that Iran had asked the Houthis to stand ready to close the route if the US struck Iranian power infrastructure, which is the sort of trigger that can move shipping expectations quickly even before vessels are diverted.[6]```

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

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.