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Invest1 publisher3 min readPublished

Polymarket's Bab el-Mandeb contract pays only after transits fall another third

Traders put 22 cents on the strait halting by December 31, but the contract resolves only if IMF PortWatch counts ten arrivals or fewer against the fifteen crossing now, while war-risk cover runs 0.7% to 2% of hull value.

The Investor · Invest desk

Photograph accompanying Polymarket's Bab el-Mandeb contract pays only after transits fall another third
Photo: polymarket.com

What happened

  • Polymarket traders price a 22% chance that the Bab el-Mandeb Strait is effectively closed by December 31, 2026, after a recent range of 21% to 33%.
  • The contract resolves only if IMF PortWatch shows a seven-day moving average of ship arrivals at 10 or fewer, a level the source says has not been reached.
  • Daily crossings have halved on some days to about 15 vessels, which the source puts 40% to 60% below pre-crisis traffic through the strait.
  • Houthi forces took the Yemeni port of Mokha in September 2026 along with Perim Island and the Hanish islands, positions overlooking and sitting inside the shipping lane.
  • Volume across the related Polymarket contracts has run between $5 million and $14 million.

Compiled by The InvestorSomething wrong?How this is made

Why it matters

  • constraint The trigger sits a third below current traffic. A shipper using this contract as reroute cover carries the degraded-but-open state entirely on its own book, and that is the state generating today's bills.
  • exposure Under the Houthis' stated selective-passage policy, one operator's vessels can be barred in practice while total arrivals stay above ten. The hedge expires worthless against a route that is closed to that operator.
  • cost Market depth caps how much of this risk can be transferred at all. Whatever a liner cannot lay off in five to fourteen voyages' worth of contracts it keeps paying to war-risk underwriters.
  • capability Planners without a paid intelligence subscription can now read Red Sea escalation off a price that moved within hours of the Perim seizure. Consultancy assessments take days or weeks.

Another third off the daily arrival count is what separates the traffic the strait is carrying from the level at which the contract pays [16]. Run the source's own comparison backwards and pre-crisis traffic was 25 to 37.5 crossings a day [22], so the resolution line sits at 27% to 40% of normal [23].

The money is already going out at fifteen. War-risk cover for a transit is quoted at 0.7% to 2% of hull value [9]. A $200m hull sits inside the range Crypto Briefing describes for large container ships, and at those rates that is $1.4m at the bottom and $4m at the top [17]. The publication reports per-voyage costs above a million dollars [10]. A contract that resolves only on collapse returns none of it.

At a million dollars of premium a sailing, the whole Polymarket book across the related Bab el-Mandeb contracts is equivalent to five to fourteen voyages of war-risk cover [18]. A buyer who needs a quarter's sailings hedged cannot get that here, and the remainder keeps being paid to underwriters.

As a price it is still useful. Shares pay $1 if the event occurs and nothing if it does not [12], so 22 cents buys 78 cents of upside, a net 3.55 to 1 [20]. About three months are left to the December 31 resolution [15]. Multiply the 22% by the 10 to 14 days a Cape of Good Hope routing adds to an Asia-Europe voyage [14], and a planner has 2.2 to 3.1 days of expected extra transit to put in the schedule [19].

The Houthis say navigation remains open to all vessels except those linked to nations they consider hostile [8]. If that holds, arrivals can sit above ten for months while a particular operator is barred in practice, and the contract expires worthless. Further gains after Mokha, Perim Island and the Hanish islands, or an international military response, take arrivals under ten and it pays [7]. Or nothing moves and the price decays into December. Roughly 12% of global trade normally passes through the strait [3]. Qatar has publicly warned that an effective closure would be a catastrophe for global energy markets, with the passage carrying liquefied natural gas from the Persian Gulf to European and Asian buyers [11].

I would buy the 22 cents as information and keep paying the premium. The resolution threshold sits below the level at which cash is already leaving, so the contract covers the state the strait might reach and not the state it is in. The counter-case is a decent one. Chokepoints do not always degrade gently, and if fifteen becomes single digits inside a fortnight the threshold and the loss arrive in the same week. At that point 22 cents bought 78.

What to watch

  • The PortWatch seven-day average itself: a print at 11 or 12 would show the 15-vessel level is not holding.
  • Whether Polymarket volume on these contracts grows past $14m. Volume that size would show insurers trading the contract, not reading it.
  • Further Houthi territorial gains beyond Mokha and the islands, or an international military response to them.
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