Short Answer

Traffic through the Bab el-Mandeb Strait for September 14-20 is considered likely to exceed 150 transits by the market (85.0%), though the model estimates a lower 71.5% chance. This outlook conflicts with observed transit calls, which have fallen significantly below 150 due to recent Houthi territorial gains and the enforced Red Sea blockade.

1. Market Behavior & Drivers

The market's sharpest move, a 32.0 percentage point spike on September 12, does not appear to correspond with verifiable events. According to available research, maritime traffic on that date was reportedly recovering, with 73 vessels transiting in a 48-hour period. This reported recovery runs counter to price action that would suggest increased risk or disruption.
Similarly, the preceding 13.0 point spike on September 11 lacks a clear driver in the provided context. On that day, Houthi forces seized strategic locations and imposed an embargo. Earlier reports already indicated a 50% decline in ship transits. These developments would typically weigh against, not in favor of, expectations for normal traffic volumes.
The overall upward trend in the contract price, moving from 6.0% to 59.0%, is inconsistent with reports of a drastic reduction in shipping. As of September 13, daily traffic through the Bab el-Mandeb Strait had reportedly fallen to 15-26 vessels, less than half of pre-crisis levels, following Houthi seizures of Perim Island and the Hanish islands.
  • Market probability favors traffic above 150 vessels for the September 14-20 week.
  • Houthi territorial gains and blockade have severely reduced Red Sea transit calls.
  • Maritime insurance bodies expanded high-risk zones, increasing Red Sea transit costs.

Current Context

Shipping traffic through the Bab el-Mandeb Strait has drastically reduced following Houthi control. As of September 13, 2026, daily shipping has fallen to 15–26 vessels, less than half of pre-crisis volumes [1][2]. This reduction follows Houthi rebel seizures of the Yemeni coast, Perim Island, and the Hanish islands [1][3]. The Strait is largely blocked to commercial traffic due to Houthi threats and an announced Red Sea blockade, establishing the region as a permanent frontline for a "maritime embargo" against Saudi-linked vessels [1][3][4][5][6][7]. This situation generates sustained, elevated maritime risks and higher insurance premiums [1][3][4].
Regional tensions escalate, driven by Iran and Houthi coordination. Iran and the UAE will discuss potential management of the Strait of Hormuz in Oman on September 14, 2026, amid ongoing US-Iran maritime hostilities [8]. This follows an attack on an Iranian commercial vessel near Qeshm Island, which resulted in one fatality [9][10]. The Houthis have increasingly aligned with Iran's regional strategy, coordinating to challenge Red Sea and Strait of Hormuz navigation, effectively creating a "security belt" [5][7]. Iran rejects direct US negotiations and demands termination of US blockades as a precondition for easing Persian Gulf maritime restrictions, diminishing prospects for a diplomatic breakthrough during regional meetings [9][11][10].
Major shipping lines reroute, accepting extended voyage times. Most major carriers continue to avoid the Red Sea to minimize risk, opting for longer routes around the Cape of Good Hope [5][6][7]. This absorbs global fleet capacity and adds 10-14 days to voyage times [5][7]. Increased reliance on these longer, more costly alternate routes is expected to persist as long as both the Red Sea and the Strait of Hormuz remain contested [1][3][4][5][7].
Sources (11)
  1. 1Ship traffic in Bab Al Mandeb strait halves as Houthis seize control of key island | The Nationalthenationalnews.com
  2. 2Bab el-Mandeb traffic falls sharply to around 26 vessels a dayaa.com.tr
  3. 3Yemen's Houthis take over strait vital to global shipping - Middle East and Africa - The Jakarta Postthejakartapost.com
  4. 4The Houthis at Bab el-Mandeb and the Stakes Ahead – HORN REVIEWhornreview.org
  5. 5The Houthi threat is not new, but it has expanded considerably over the past decade, threatening stability in Yemen and the Gulf, as well as global commerce through the Red Sea. In fact, Houthi threats to shipping in the Bab-el-Mandeb provided a model for Iranian actions in the Strait of Hormuz. Now, with the Red Sea blockade the Houthis announced in late July, the group is threatening to take roughly four million barrels per day of oil off the markets at a time when global energy supplies are already strained.congress.gov
  6. 6MorningNewsAgentTest/MorningNews_20260816_Claude-1-4-1.mdgithub.com
  7. 7Countering Houthi Terrorism: Protecting U.S. Interests and Security in the Red Seacongress.gov
  8. 8UAE, Iran Leaders Meet as Push to Resolve Hormuz Standoff Grows - Bloombergbloomberg.com
  9. 9Vessel struck in Strait of Hormuz, UKMTO reports | CNNcnn.com
  10. 10An Iranian commercial ship is struck near Strait of Hormuz with 1 dead, Iranian media say | The Hillthehill.com
  11. 11Iran President Masoud Pezeshkian says Iran will not surrender, rejects nuclear weapons claims - India Todayindiatoday.in

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Significant Price Movements

Notable price changes detected in the chart, along with research into what caused each movement.

📈 September 12, 2026: 64.0pp spike

Price increased from 21.0% to 85.0%

Outcome: Above 150

What happened: The research indicates that the reported 64.0 percentage point spike in traffic through the Bab el-Mandeb Strait to "Above 150" on September 12, 2026, does not correspond to verifiable events [1][2][3][4]. On that date, maritime traffic was reportedly recovering to 73 vessel transits in 48 hours after a prior sharp decline, rather than experiencing a significant spike to "Above 150" [5][6][7]. The terms "above 150" and "64.0pp" appear to be unrelated technical artifacts or misinterpretations of data, not reflecting actual Bab el-Mandeb traffic [8][9][10][11][12]. Therefore, no primary driver, including social media activity, can be identified for this described price movement, as the underlying event is not substantiated by the provided information.

📈 September 11, 2026: 15.0pp spike

Price increased from 6.0% to 21.0%

Outcome: Above 150

What happened: The available research does not support the stated 15.0 percentage point price spike for "Above 150" vessels transiting the Bab el-Mandeb Strait on September 11, 2026. On that date, Houthi forces seized key strategic locations and imposed an embargo, while earlier reports indicated a 50% decline to 15 vessels per day, making an "Above 150" outcome highly improbable [13][14][15][16]. Furthermore, the specific numeric details of the market movement (outcome "Above 150", 15.0pp spike, date, and news/social media catalyst) are explicitly noted as not corresponding to verified events regarding the Strait's traffic and instead appear in unrelated technical contexts [17][18][19][8][11][20][21][22][23][24]. Therefore, no primary driver, whether from social media or traditional news, can be identified from the provided information as the market movement itself is ungrounded in the given facts.
Sources (24)
  1. 1The Houthi threat is not new, but it has expanded considerably over the past decade, threatening stability in Yemen and the Gulf, as well as global commerce through the Red Sea. In fact, Houthi threats to shipping in the Bab-el-Mandeb provided a model for Iranian actions in the Strait of Hormuz. Now, with the Red Sea blockade the Houthis announced in late July, the group is threatening to take roughly four million barrels per day of oil off the markets at a time when global energy supplies are already strained.congress.gov
  2. 2Houthi Attacks in the Red Sea:congress.gov
  3. 3Iran Conflict and the Strait of Hormuz: Impacts on Oil, Gas, and Other Commodities | Congress.gov | Library of Congresscongress.gov
  4. 4Yemen: Conflict, Red Sea Security, and U.S. Policycongress.gov
  5. 5Strait of Mandeb Sees 73 Vessel Transits in 48 Hours, Traffic Recovers to 98.6% of Pre-Blockade Levels | Gate Newsgate.com
  6. 6Bab al-Mandab confounds Sanaa’s adversaries: Passage of 73 ships in 48 hours shatters “threat to navigation” scarecrow – Yemen Press Agencyen.ypagency.net
  7. 7Vessel Transits Through Bab El-Mandeb Strait Plummet to 6 Ships on September 10, Down From 30 Prior Day | Gate Newsgate.com
  8. 8jihadakbr/delivery-time-route-efficiency-zomatogithub.com
  9. 9Aditya-2215/Urban-AI-qualitygithub.com
  10. 10apifyforge/esg-supply-chain-risk-mcpgithub.com
  11. 112f1015b Only use dense chart mode above 150 solvesgithub.com
  12. 12KawsarAhmedSagar/bangladesh-air-qualitygithub.com
  13. 13Ship traffic in Bab Al Mandeb strait halves as Houthis seize control of key island | The Nationalthenationalnews.com
  14. 14Strikes shut down key Saudi pipeline as Iran-backed Houthis tighten...nbcnews.com
  15. 15Iran Update, September 11, 2026 | ISWunderstandingwar.org
  16. 16Iranian allies captured a strategic Red Sea island in a vital waterway. Here’s what to know - Egypt Independentegyptindependent.com
  17. 17tcp syn and accept queue charts and alarms · Pull Request #4281 · netdata/netdatagithub.com
  18. 18tobi1196/Infogruppe-RE---2github.com
  19. 19analytics-ak/ops-performance-analyzergithub.com
  20. 20AutoMem BEAM 100k v2gist.github.com
  21. 21Adds a simulation + optimization script to find ideal node/runner sizes based on historical datagithub.com
  22. 22docs(opd): full-CoT rollout-256 ALSO regresses GSM8K -11pp — capacity gate, not truncation (CONCLUSIVE) · be9a4b9 · cklxx/arlegithub.com
  23. 23Add gemma3-opus-distill postgithub.com
  24. 24Sharded-vs-unsharded structural gap: +31pp recall@10 / +30pp MRR on xl — root-cause umbrella (fetch depth ruled out)github.com

4. Market Data

Contract Snapshot

This Kalshi market predicts the "Traffic through the Bab el-Mandeb Strait" for the period of September 14-20. For a contract like "Above 200," a YES resolution occurs if the traffic count during this period is greater than 200. A NO resolution is triggered if the traffic count is 200 or less. The specific date range for the traffic data collection is September 14-20; no other key dates, deadlines, or special settlement conditions are detailed in the provided content.

Market Discussion

Prediction market sentiment is bearish for Bab el-Mandeb transit for the week of September 14–20, 2026, with a 39% probability of fewer than 170 ships, due to reported Houthi territorial gains at Perim Island and Mokha port on September 10–11 [1]. Houthi control of the Yemeni Red Sea coast and an announced blockade effective since late July 2026 have reportedly reduced daily transits to approximately 15 ships, leading to social media commentary and geopolitical warnings that the strait is a highly unstable "Axis of Resistance" chokepoint, viewed as more escalatory than the Strait of Hormuz amid interlinked U.S.-Iran regional tensions [1][2][3][4][5][6][7][8]. Despite these disruptions, prediction markets still assign a ~74% probability that the strait will avoid the specific threshold for "effective closure" (defined as 10 or fewer transit calls daily) by year-end [2][9][10].

Sources (10)
  1. 1How many ships transit Bab el-Mandeb Strait week of September 14?polymarket.com
  2. 2The Houthis Just Took the Bab el-Mandeb. This Bet Still Says 74% It Stays Openainvest.com
  3. 3Iran Update, September 11, 2026: The Houthis are setting...facebook.com
  4. 4Hormuz Was a Negotiation. Bab al Mandab Is War.kurdistan24.net
  5. 5Angry: "I hope folks realize this Bab al-Mandab situation will be much worse than the Strait of Hormuz if it’s not sorted out quickly. And it doesn’t currently look like it will be sorted out quickly." — deer.socialdeer.social
  6. 6Iran’s Chokepoint Strategy: Hormuz and Bab al-Mandebftntv.com
  7. 7The Houthi threat is not new, but it has expanded considerably over the past decade, threatening stability in Yemen and the Gulf, as well as global commerce through the Red Sea. In fact, Houthi threats to shipping in the Bab-el-Mandeb provided a model for Iranian actions in the Strait of Hormuz. Now, with the Red Sea blockade the Houthis announced in late July, the group is threatening to take roughly four million barrels per day of oil off the markets at a time when global energy supplies are already strained.congress.gov
  8. 8WyattBarandino/red-sea-port-orchestrationgithub.com
  9. 9Bab el-Mandeb Strait effectively closed by...?polymarket.com
  10. 10Bab el-Mandeb Strait Closure: Low Catalysts and Structural Rule Risks Define the Pricing Regimeainvest.com

5. Trust Index

This scorecard was computed Sep 21, 2026 and may not reflect current market conditions.

Octagon Trust Index Kalshi 80 Good
How it adds up
Integrity80% of score85Strong
Trade quality20% of score58Caution

Includes the cost to trade: a $10,000 order can't be filled here because the order book is too thin.

Trust score80Good

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity4 screens run · 6 don't apply
Market integrity
85Strong

Outcome is hard to influence

No suspicious activity on any screen

Screened clean
Large tradesNo single trade dominates the tape. Clear
Thin-volume movesNo significant move Clear
Size patternsNo distribution read Clear
2 screens not run
Outcome control · doesn't apply to this market type
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

Screened clean
Information exposureNo concentrated group can know the outcome materially early. Clear
4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · doesn't apply to this market type
Resolution quality
92Strong

Resolution mechanism is dependable

No suspicious activity on any screen

Resolution rules read: Clear

Liquidity
68Tradeable

Fills fine at modest size

5 contracts · worst first

Above 2259
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 20037
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 15074
Tradeable · low confidence

Light recent trading — size may not fill near the screen price.

Above 17574
Tradeable · low confidence

Light recent trading — size may not fill near the screen price.

Above 250—
No recent trading to measure

No recent trading to measure

Move quality
88Confirmed

Moves came with real volume

5 contracts · worst first

Above 22586
Confirmed · medium confidence

Volume confirms the move over 7d

Above 25091
Confirmed · medium confidence

Volume confirms the move over 7d

Above 150—
No significant move (6h)

Price was stable over the last 6 hours.

Above 175—
No significant move (6h)

Price was stable over the last 6 hours.

Above 200—
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

5 contracts · worst first

Above 150100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 175100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 200100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 225100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 250100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
58Caution

Order book is thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 70 (notional-weighted across 4 scored legs)

$100 order: 0.8c slippage (~1% of a 79.5c contract)

$1,000 order: 4.2c slippage (~5% of a 79.5c contract)

$10,000 order: book too thin to fill

Above 15074Market scoreLiquidity74Move quality–Rule clarity100
Why 74
Liquidity
74 · Tradeable · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 17574Market scoreLiquidity74Move quality–Rule clarity100
Why 74
Liquidity
74 · Tradeable · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 20037Market scoreLiquidity37Move quality–Rule clarity100
Why 37
Liquidity
37 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2259Market scoreLiquidity9Move quality86Rule clarity100
Why 9
Liquidity
9 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
86 · Confirmed · medium confidence

Volume confirms the move over 7d

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 250–Market scoreLiquidity–Move quality91Rule clarity100
Why this score
Liquidity
No recent trading to measure

No recent trading to measure

Move quality
91 · Confirmed · medium confidence

Volume confirms the move over 7d

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 21, 2026

6. What specific outcomes from the September 14 Iran-UAE meeting could alter Houthi actions at the Bab el-Mandeb strait?

Iran-UAE Relations StatusHalted relations as of August and September 2026 [1][2][3][4]
Houthi Control Bab el-MandebSignificantly increased by September 13, 2026 [2][5]
Bab el-Mandeb Strait TrafficSeverely suppressed [6][2]
A September 14 Iran-UAE meeting is unlikely to alter Houthi actions. Any diplomatic easing or positive impact on Houthi behavior from a September 14 meeting between Iran and the UAE is improbable. This is due to the current state of "halted relations" between the two nations [1][2]. Furthermore, there are no public reports confirming a specific meeting scheduled for this date, and the existing diplomatic climate makes a positive outcome improbable [1][2].
Deteriorating Iran-UAE relations and Houthi gains complicate the regional situation. Iran-UAE relations have significantly deteriorated as of August and September 2026. The UAE halted all trade, exchange, and financial transactions with Iran following an Iranian missile fire incident near its territorial waters on August 18, 2026 [3][4]. Concurrently, the Houthis have substantially increased their control over the Bab el-Mandeb strait by September 13, 2026, capturing the port city of Mocha and strategic islands like Perim and Zuqar [2][5]. Consequently, traffic through the Bab el-Mandeb strait is already severely suppressed due to the Houthi maritime blockade targeting Saudi-linked vessels and their physical control of key approach points [6][2].
Sources (6)
  1. 1EXCLUSIVE: Yemen's Houthis considering fees for ships sailing through Red Sea, sources say | Reutersreuters.com
  2. 2Houthis Advance on Bab al-Mandeb as Saudi Oil Route Comes...oilprice.com
  3. 3Iran–United Arab Emirates relations - Wikipediaen.wikipedia.org
  4. 4The United Arab Emirates says its air force intercepted an Iranian...facebook.com
  5. 5Houthis seize key island in Bab el-Mandeb, take control of the straiteuronews.com
  6. 6Iran Update, September 11, 2026 | ISWunderstandingwar.org

7. What are the current operational capabilities and stated intentions of Houthi forces controlling the islands flanking the Bab el-Mandeb strait?

Bab el-Mandeb Control DateSeptember 13, 2026 [1][2]
Mayun Island CaptureSeptember 11 [1][3]
Daily Ship Transits25-31 [4][5]
Houthi forces consolidated physical control over the Bab el-Mandeb Strait by September 2026 [1][2]. By September 13, 2026, they had established the physical capability to contest or potentially deny maritime traffic in the strait [1][2]. This control was achieved through strategic captures, including the port city of Mocha, the Yemeni Red Sea coastline, and the pivotal Mayun (Perim) Island on September 11 [1][3]. However, analysts note that defending Mayun Island against a prolonged amphibious assault remains a significant strategic challenge [2][1][6].
Houthi forces state conflicting intentions, significantly impacting Bab el-Mandeb shipping [3][6][7]. While declaring aims to keep international shipping "safe and uninterrupted," they simultaneously enforce a naval blockade against Saudi-linked vessels and are considering imposing transit fees on commercial traffic [3][6][7]. Due to these security risks, traffic through the Bab el-Mandeb has been substantially suppressed throughout 2026. Consequently, many major shipping lines have chosen to reroute around the Cape of Good Hope, resulting in daily commodity ship transit volumes remaining near or below historic lows of 25-31 [4][5].
Sources (7)
  1. 1Iran-backed Houthis seize strategic Mayun Island: Can they hold it?aljazeera.com
  2. 2Houthis seize key island in Bab el-Mandeb, take control of the straiteuronews.com
  3. 3Strikes shut down key Saudi pipeline as Iran-backed Houthis tighten...nbcnews.com
  4. 4https://polymarket.copilot.markets/it/event/avgpt-of-ships-transiting-bab-el-mandeb-strait-end-of-august-1785517679415polymarket.copilot.markets
  5. 5https://polymarket.copilot.markets/id/event/houthis-successfully-target-shipping-onptptpt-20260722225036915polymarket.copilot.markets
  6. 6Yemen's Houthis close in on Bab el-Mandeb Strait in new... - Reutersreuters.com
  7. 7Houthis control key shipping route after gains along Yemen's Red...aljazeera.com

8. How do the costs and transit times of the Cape of Good Hope route compare to the risks and insurance premiums of the Red Sea for major carriers in September 2026?

Red Sea War-Risk Insurance PremiumExceeds 1% of vessel's value [1][2][3][4]
Cape of Good Hope Transit Time Increase10–14 days [5][4][2]
Total Economic Impact per Voyage (Large Tankers)$2.5–$4 million [2][4]
Red Sea transit entails severe risks and high insurance costs in September 2026. This route is characterized by extreme risk due to a Houthi-imposed naval blockade and territorial gains in the Bab el-Mandeb Strait [1]. Consequently, indicative war-risk insurance premiums now exceed 1% of a vessel's value [1][2][3][4]. Prediction markets and industry reports from mid-September 2026 indicate that traffic through the Bab el-Mandeb Strait is severely depressed and is expected to remain restricted due to the Houthis' strategic control of key islands and areas near the strait [6][7][8].
Major carriers now prioritize the longer, more costly Cape of Good Hope route. Despite the increased transit time of 10-14 days and significantly higher operational expenses, this alternative route has become the standard [5][4][2]. Each voyage via the Cape of Good Hope incurs roughly $1 million in additional fuel and vessel operating expenses [5][4]. For large tankers, the combined economic impact from insurance, fuel, and operational delays can exceed $2.5-$4 million per voyage, compelling carriers to opt for the Cape route [2][4].
Sources (8)
  1. 1Red Sea war insurance costs rise after Houthi blockade, sources sayreuters.com
  2. 2The multimillion-dollar cost of the Hormuz-Red Sea closure - AGBIagbi.com
  3. 3Red Sea Crisis Update: Route Alternatives & Cost Impactsdocshipper.com
  4. 4The Arteries Of Civilisation: Complete World Trade Routes — History, Obstructions, Markets & Trade Setups | The Capital Dispatch — Updated April 08, 2026 - Global Forex & CFD Broker | 1:10000 Leveragecapitalstreetfx.com
  5. 5Mapping the most critical shipping lanes in the world - ABC Newsabc.net.au
  6. 6Traffic through the Bab el-Mandeb Strait? (9/7 - 9/13) - Kalshikalshi.com
  7. 7Yemen's Houthis capture key city close to Bab el-Mandebargusmedia.com
  8. 8Houthis seize key island in Bab el-Mandeb, take control of the straiteuronews.com

9. Which public data sources offer the most reliable daily counts for vessel transits through the Bab el-Mandeb strait for the week of September 14-20?

Primary Public Data SourceIMF PortWatch [1][2][3][4][5][6][7]
Prediction Market Resolution SourceIMF PortWatch "Arrivals of Ships" data for the Bab el-Mandeb Strait [7]
Data ProvidedDaily AIS-derived transit calls for commercial cargo, tanker, and other vessels [1][2][3][4][5][6][7]
IMF PortWatch serves as the most reliable source for Bab el-Mandeb vessel counts. This platform is recognized as the most dependable public data source for daily vessel transit counts through the Bab el-Mandeb Strait [1][2][3][4][5][6][7]. Its standing as a primary data platform is well-established, with frequent use for institutional purposes and for the resolution of prediction markets. A clear example of its authoritative role is its official designation as the resolution source for the prediction market covering the week of September 14–20, 2026, specifically using its "Arrivals of Ships" data for the Bab el-Mandeb Strait [7].
IMF PortWatch data provides comprehensive daily AIS-derived transit calls. The information encompasses commercial cargo, tanker, and various other vessel types [1][2][3][4][5][6][7]. Although alternative tracking platforms such as The Maritime, ShipInfo, Strait Up Maritime, and TankerMap are available, they are typically regarded as supplementary resources. IMF PortWatch's dataset functions as the industry-standard baseline for these markets [2][8][4][9][10].
Sources (10)
  1. 1IMF - Bab el-Mandeb Strait - Daily Transit Calls & Transit Trade Volume | MacroMicroen.macromicro.me
  2. 2Chokepoint transit monitor - The Maritimethemaritime.net
  3. 3Bab el-Mandeb — oil transit chokepoint | OverWattsoverwatts.com
  4. 4Strait of Hormuz, Suez & Red Sea Live Ship Traffic — Shipping Chokepoint Trackerjasperbernaers.com
  5. 5eventc1000000 - IMF PortWatch - International Monetary Fundportwatch.imf.org
  6. 6How many ships transit Bab el-Mandeb Strait week of September 7?polymarket.com
  7. 7How many ships transit Bab el-Mandeb Strait week of September 14?polymarket.com
  8. 8Bab el-Mandeb Strait Vessel Traffic, Congestion & Shipping Trends | ShipInfoshipinfo.net
  9. 9Bab el-Mandeb Live — Real-Time Vessel Tracking Map | Strait Up Maritimestraitupmaritime.com
  10. 10Bab el-Mandeb - Tanker Traffic - Daily Transits & Tonnage | TankerMaptankermap.com

10. What recent guidance have maritime insurance bodies, like the Lloyd's Market Association, issued for the Red Sea region effective mid-September 2026?

JWC Guidance UpdateJuly 29, 2026 [1][2]
Insurer Exclusion EffectiveAugust 16, 2026 [3][4]
Bab el-Mandeb Traffic PredictionLower volumes (September 14–20, 2026) [5]
As of mid-September 2026, the Lloyd's Market Association expanded the Red Sea high-risk maritime zone. The Joint War Committee (JWC) of the Lloyd's Market Association issued its most recent significant guidance for the Red Sea on July 29, 2026, which adjusted the designated high-risk zone [1][2]. This advisory specifically adjusted the Red Sea notification line northwards, effectively widening the high-risk zone to encompass more of the Red Sea coast adjacent to Saudi Arabian ports, extending near Jizan [1][2]. This represents the most recent significant advisory from the JWC concerning the Red Sea as of mid-September 2026 [1][2].
Insurers expanded war risk exclusions, impacting Red Sea traffic. Effective August 16, 2026, several marine insurers implemented expanded war risk exclusion areas across the Red Sea, Gulf of Aden, and Indian Ocean [3][4]. This decision followed notices of cancellation from reinsurers in mid-August 2026 and was a reaction to intensified Houthi attacks on commercial shipping and Saudi-linked vessels [3][4]. Prediction markets for the week of September 14–20, 2026, are currently pricing in lower volumes for traffic through the Bab el-Mandeb Strait, driven by recent reported Houthi seizures of key coastal positions in mid-September [5].
Sources (5)
  1. 1Houthis' Red Sea attacks prompt London insurers to widen high-risk...reuters.com
  2. 2London Insurers Widen Red Sea High-Risk Zone After Houthi Attacksgcaptain.com
  3. 3War Risk Cover – Red Sea, Gulf of Aden including Indian Ocean - A MARKEL Companythemecogroup.co.uk
  4. 4Red Sea, Gulf of Aden, Indian Ocean war risk cover withdrawn by several insurers | Maritime Insurance news | Shipping Telegraphshippingtelegraph.com
  5. 5How many ships transit Bab el-Mandeb Strait week of September 14?polymarket.com

11. What Could Change the Odds

Key Catalysts

Houthi territorial gains around Mokha and Perim (Mayun) Island on September 10–11, 2026, have heightened maritime risks, with daily Bab el-Mandeb transits reportedly halved to approximately 15 vessels, far below pre-crisis baselines [1][2][3][4]. The Houthi movement announced a Red Sea blockade in late July 2026, threatening significant global oil transit [5][6]. This strategic situation is characterized by a shift toward horizontal escalation, where Houthi control over coastal geography allows for increased pressure on the chokepoint through missile and drone threats, rather than a total physical closure [7][2][3][4]. As of September 2026, the Bab el-Mandeb Strait remains a zone of high geopolitical volatility [5][6].
Broader regional conflict involving Iran's targeting of Arab states remains high, with prediction markets showing near-total certainty of continued hostilities through September 30, 2026 [8][9]. This creates a persistent bearish outlook for maritime stability in both the Bab el-Mandeb and the Strait of Hormuz [8][9]. The ongoing instability is driven by an expanded U.S.-Iran conflict, with Houthi actions increasingly coordinated with Iran, aiming to project power across a security belt stretching from the Strait of Hormuz to the Bab el-Mandeb [5][10][11]. Prediction market sentiment for the week of September 14–20, 2026, reflects extreme caution, with significant interest in whether sustained Houthi threats will drive transit volumes below critical thresholds; IMF PortWatch is the designated resolution source for these markets [1][12][3]. Previous 2026 market patterns showed a recurring cycle of carrier rerouting via the Cape of Good Hope and subsequent attempts to return to the Suez corridor, followed by repeated reversals due to renewed attacks, suggesting continued high risk for shipping through the week of September 14–20, 2026 [10].

Key Dates & Catalysts

  • Strike Date: September 22, 2026
  • Expiration: December 21, 2026
  • Closes: September 22, 2026
Sources (12)
  1. 1How many ships transit Bab el-Mandeb Strait week of September 14?polymarket.com
  2. 2The Houthis and Bab al-Mandab: How does control over Mayun threaten the Suez Canal and global trade?voiceofemirates.com
  3. 3Bab el-Mandeb Strait Closure: Low Catalysts and Structural Rule Risks Define the Pricing Regimeainvest.com
  4. 4The Houthis at Bab el-Mandeb and the Stakes Ahead – HORN REVIEWhornreview.org
  5. 5The Houthi threat is not new, but it has expanded considerably over the past decade, threatening stability in Yemen and the Gulf, as well as global commerce through the Red Sea. In fact, Houthi threats to shipping in the Bab-el-Mandeb provided a model for Iranian actions in the Strait of Hormuz. Now, with the Red Sea blockade the Houthis announced in late July, the group is threatening to take roughly four million barrels per day of oil off the markets at a time when global energy supplies are already strained.congress.gov
  6. 6Countering Houthi Terrorism: Protecting U.S. Interests and Security in the Red Seacongress.gov
  7. 7Strategic Assessment - 10 Sept 2026 - Gulf Energy Corridorspowerncorridors.com
  8. 8Will Iran Target an Arab Country by September 30, 2026? Odds | Lines.comlines.com
  9. 9Will Iran Target an Arab Country by September 30? Odds | Lines.comlines.com
  10. 10WyattBarandino/red-sea-port-orchestrationgithub.com
  11. 11Iran Conflict and the Strait of Hormuz: Impacts on Oil, Gas, and Other Commoditiescongress.gov
  12. 12Bab el-Mandeb Strait effectively closed by...?polymarket.com

13. Related News

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14. Historical Resolutions

Historical Resolutions: 20 markets in this series

Outcomes: 10 resolved YES, 10 resolved NO

Recent resolutions:

  • KXBABELMANDEBWEEKLY-26SEP06-T250: NO (Sep 08, 2026)
  • KXBABELMANDEBWEEKLY-26SEP06-T225: NO (Sep 08, 2026)
  • KXBABELMANDEBWEEKLY-26SEP06-T200: NO (Sep 08, 2026)
  • KXBABELMANDEBWEEKLY-26SEP06-T175: YES (Sep 08, 2026)
  • KXBABELMANDEBWEEKLY-26SEP06-T150: YES (Sep 08, 2026)