Scan: Strait of Hormuz traffic returns to normal by December 31?

date	predicted	market price	confidence
2026-08-31	20%	28%	67%
2026-08-24	25%	34%	58%
2026-08-17	31%	42%	56%

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: polymarket_direct polymarket_related kalshi_related claude_news article_search gdelt_news wikipedia code_execution

Sub-questions (Fermi decomposition)

What is the most recent IMF Portwatch 7-day moving average of transit calls for the Strait of Hormuz, and how does it compare to the pre-disruption baseline (historically ~100-140/day) and the 60 threshold?
What event caused Hormuz traffic to collapse (Iranian closure, US/Israel-Iran war, attacks on shipping), and what is the current status of hostilities, ceasefire talks, or a formal reopening announcement?
Are there physical impediments (mines, damaged infrastructure, naval blockade, GPS jamming) that would delay traffic recovery for weeks/months even after a political resolution?
What are war-risk insurance premiums and the stated positions of major tanker/container operators (Maersk, Frontline, Hapag-Lloyd, etc.) on resuming Hormuz transits?
In historical analogues (2019 Gulf tanker attacks, Red Sea/Houthi disruption 2023-2025, 1980s Tanker War), how quickly did transit counts recover to 50%+ of baseline after de-escalation?
What probabilities do related Polymarket/Kalshi markets assign to Iran ceasefire, Hormuz reopening, or lower/higher transit-call thresholds, and are they consistent with this market?
Does IMF Portwatch data have publication lags, revisions, or counting quirks (e.g., ships anchored vs transiting) that affect how quickly a >=60 reading could appear?

Planner reasoning

This resolves on a single objective data series (IMF Portwatch 7-day MA of Hormuz transit calls reaching >=60), so the key drivers are the current traffic level versus the threshold, the nature and trajectory of the underlying disruption (Iran conflict/closure), physical hazards like mines, and shipping-industry willingness to return. The Polymarket price is the primary anchor; related Polymarket/Kalshi Hormuz and Iran markets provide cross-checks, and news tools establish the current state of the disruption and any ceasefire/reopening timeline.

2. Research Parallel tool calls

tool	status	time	items	summary
polymarket_direct	OK	0.8s	1	## This Market's Polymarket Data Strait of Hormuz traffic returns to normal by December 31? - Current price (probability): 24.50% - 7-day price change: -3.00% - 30-day price change: -23.00% - Total volume: $10,543,455 (USD notional) - Price range: 24.50% - 90.50% - Data points: 90 days
polymarket_related	OK	1.3s	4	Scanned 100 active Polymarket markets, kept 4 matches. keyword 'Hormuz': 2 markets \| keyword 'Iran ceasefire': 2 markets \| keyword 'Iran strait': 0 markets \| keyword 'tanker': 0 markets
kalshi_related	OK	1.1s	0	0 related markets / summaries. keyword 'Hormuz': no matches \| keyword 'Iran': no matches \| keyword 'strait': no matches
claude_news	OK	23.4s	14	## Key Findings - Current traffic levels (as of Aug 30, 2026): PortWatch recorded 6 transits on 2026-08-30, against a pre-crisis baseline of 85 per day; 333 vessels were holding position away from berth as of 14:56 UTC. That's roughly 7% of normal levels — [straits.live](https://straits.live/
article_search	OK	0.7s	21	Fetched 21 unique articles across 4 queries (lookback=30d). 'Strait of Hormuz shipping traffic transit IMF Portwatch': 10 articles \| 'Hormuz reopening tankers resume transit': 10 articles \| 'Iran ceasefire Hormuz shipping': 10 articles \| 'Hormuz mines war risk insurance premiums tankers': 10 article
gdelt_news	OK	172.6s	10	GDELT: 10 articles across 3 queries (lookback=21d). 'Strait of Hormuz shipping': error GDELT rate-limited after retries (429) \| 'Hormuz tanker traffic': 10 hits \| 'Iran Hormuz closure': error GDELT rate-limited after retries (429)
wikipedia	OK	0.2s	3	Fetched 3 Wikipedia entries (0 missing pages).
code_execution	OK	50.8s	0	Threshold vs. baseline (what "60/day" represents): - 60 daily transits against a 110–140 ships/day baseline = 43%–55% of normal traffic (midpoint ~48%, using baseline≈125/day). Recovery to this level is a partial, not full, normalization. Recovery-speed analogues used: - No-mines / th

3. Evidence Brief Sonnet 5 · 7557 chars

# Current state The Strait of Hormuz has been under active war disruption since 2026-02-28 (US/Israel-Iran air war), with Iran mining/blockading the strait, a collapsed April–July ceasefire attempt, and a US naval blockade re-imposed 2026-07-14 against Iran-linked traffic. As of 2026-08-30, IMF PortWatch recorded a 7-day moving average around 6-8 transits/day (~5-7% of the ~85-138/day pre-war baseline) — far below the 60 threshold needed for "Yes." Attacks on commercial vessels continue into early September 2026 despite CENTCOM declaring mines cleared; no durable political resolution exists. # Timeline of key events - 2026-02-28: US and Israel launch air war on Iran; IRGC blocks strait, boards/attacks ships, lays mines (confirmed — Wikipedia, claude_news). - 2026-03-27: Howden Re issues war-risk report flagging Hormuz insurance repricing (reported). - Early April 2026: US-Iran ceasefire reached (reported, unconfirmed details). - Mid-June 2026 (~June 17): MOU reopens strait toll-free; traffic stays well below normal (reported). - Early July 2026: Ceasefire/MOU collapses after renewed attacks on commercial vessels (reported). - 2026-07-14: US forces reimpose naval blockade on vessels to/from Iranian ports (confirmed — claude_news/UANI). - 2026-07-20: Houthis declare separate naval blockade against Saudi ports (reported). - 2026-08-12: CNBC/Kpler: traffic ~90% below pre-war baseline (130 ships/day); 5-day avg ~13 vessels (confirmed data-sourced). - 2026-08-15–08-22: CNN reporting traffic near 4-7% of pre-war levels; "dark," US-escorted nighttime transits via Oman route emerge as workaround (reported). - 2026-08-25: Argus Media — outbound Hormuz transits drop to zero (reported). - 2026-08-26–08-27: Tanker struck near Oman; Qatari PM visits Iran for de-escalation talks; only 5 confirmed crossings on Aug 27, all via Iran's unilateral designated route (reported). - 2026-08-30: PortWatch 7DMA ≈6 transits/day; 333 vessels holding position (confirmed). - 2026-09-01: UANI — since July 14, US redirected 84 vessels, disabled 3, boarded 2 for non-compliance (confirmed). - 2026-09-02: Energy Sec. Wright claims 17M bbl transited Monday via escorted route; UKMTO reports two tanker attacks that week (reported/disputed). # Event Will the IMF PortWatch 7-day moving average of Strait of Hormuz transit calls reach ≥60 on any date before 2026-12-31? # Outcomes to forecast Yes / No # Kalshi market anchor No native Kalshi market found (kalshi_related: 0 matches). Cross-listed Polymarket market on the identical ticker shows **current YES price 24.5%**, down from a peak of 90.5%, down 3pp over 7 days and 23pp over 30 days, on $10.5M volume — a clear and accelerating downtrend as war conditions persist. This is the best available consensus anchor. # Sub-question answers 1. **Latest 7DMA vs. baseline/threshold**: ~6-8 transits/day as of 2026-08-30 (PortWatch/straits.live), vs. baseline ~85-178/day (sources vary: PortWatch 85-88, UANI 138, WEF 178) — currently ~5-9% of baseline and far below the 60 threshold (~35-70% of baseline depending on source). 2. **Cause/status**: US/Israel-Iran war since Feb 28, 2026; Iran mined/blockaded strait. A ceasefire (April) and MOU (June 17) briefly reopened it, but collapsed early July after vessel attacks; US reimposed its own blockade July 14. No durable ceasefire or reopening announcement exists as of Sept 2026 (claude_news, Wikipedia). 3. **Physical impediments**: Mines reportedly cleared by CENTCOM by late August, but attacks on vessels continue (Gateway Pundit, oilprice.com); US naval blockade actively intercepting/redirecting non-compliant traffic (84 redirected, 3 disabled, 2 boarded as of Sept 1 — UANI). 4. **Insurance/operator stance**: War-risk insurance up to 7.5-10% of hull value (from 1-3% pre-war) — a "permanent structural repricing" per Howden Re. Major operators using shadow/dark fleet tactics (transponders off) rather than resuming normal operations; no direct Maersk/Frontline/Hapag statements found in research. 5. **Historical analogues**: 2019 Gulf tanker incidents (no mines) — recovery within weeks. Red Sea/Houthi crisis (with sustained attacks) — traffic still only ~31 ships/day (below 75/day pre-war baseline) as of May 2026, ~2 years post-onset — a much slower, partial recovery precedent (Wikipedia). 6. **Related markets**: Polymarket "Hormuz normal by Sept 15" priced at 0.45% (near-certain No); "Iran ceasefire continues through Sept 30" at 87.5%; "through Dec 31" at 63% — suggesting markets see a ceasefire as more likely than full traffic normalization, consistent with partial/de-facto ceasefire not translating into commercial confidence. 7. **PortWatch data quirks**: No specific lag/revision issues surfaced in research; market rules allow 14-day publication grace period and revision handling, but no evidence of systematic undercounting/overcounting beyond standard AIS-based tracking gaps (dark fleet ships may not register — could bias readings low, working against Yes). # Key facts (high-confidence, factual) 1. [Wikipedia/claude_news] War began Feb 28, 2026; strait effectively blocked since. 2. [CNBC 8/12] 7-day avg ~13 vessels/day vs. ~130/day pre-war baseline — ~90% reduction, near 3-month low. 3. [UANI 9/1] US blockade active since July 14; 84 vessels redirected, 3 disabled, 2 boarded. 4. [PortWatch/straits.live 8/30] 7DMA ≈6, 333 ships holding position. 5. [Howden Re] War-risk insurance premiums 7.5-10% of hull value vs 1-3% pre-war. # Cross-market signals - Polymarket (same market): 24.5% YES, falling trend (-23% in 30 days). - Polymarket related: Sept 15 Hormuz-normal market at 0.45% (near-zero); ceasefire-through-Dec-31 market at 63%. - Kalshi: no listed market found. # Analyst opinions and speculation - Kamco Invest: normalization needs full reopening plus 2-3 month backlog clearance — not yet begun as of comments. - Howden Re: expects "permanent structural repricing" of war-risk insurance (Red Sea + Hormuz new baseline), implying slow return to normal even post-resolution. - Code-execution Fermi model estimated ~50-60% Yes probability under generic scenario assumptions, but this appears to predate/ignore the July ceasefire collapse and current ~6-8/day reading — likely stale/overoptimistic relative to actual ground truth. # Directional lean per outcome - **Yes**: Requires both political de-escalation AND weeks-to-months of confidence rebuilding; some easing signals (Qatari mediation, mines reportedly cleared, US-escorted "dark" transits ramping oil flow) — but no evidence of vessel *count* recovery to 60/day. - **No**: Dominant evidence — 7DMA at ~5-9% of baseline, active blockade, continued attacks, collapsed ceasefire, structurally repriced insurance, Polymarket pricing declining to 24.5%, and Houthi/Red Sea analogue showing multi-year partial recovery. # Gaps / unknowns - No direct Kalshi order book; relying on Polymarket cross-market price. - Uncertain whether a new ceasefire/reopening could occur in Q4 2026 (talks ongoing per Aug 26-27 reports). - PortWatch's exact treatment of "dark fleet" transponder-off vessels unclear — could suppress measured recovery even if physical traffic increases. # Calibration anchors - Current Polymarket YES price: 24.5% (declining) — primary anchor. - Related Sept 15 Hormuz-normal market: 0.45% — confirms near-term normalization seen as virtually impossible. - Red Sea/Houthi precedent: ~2 years to reach only ~41% of pre-crisis baseline — suggests partial recovery within a single year is optimistic absent decisive de-escalation.

4. Forecasters Fable 5.1 + GPT-5.6 Sol · in parallel

claude-fable-5-1

62% conf

Yes	18%
No	82%

The PortWatch 7DMA sits at ~6-8 transits/day (5-9% of baseline) as of Aug 30 with an active US blockade, continued vessel attacks, and a collapsed July ceasefire — a tenfold increase to ≥60 within ~4 months requires both a durable political settlement and rapid insurer/operator confidence recovery. Notably, the June MOU reopening did not restore traffic anywhere near normal before collapsing, and the Red Sea analogue shows only partial recovery two years on; war-risk premiums at 7.5-10% of hull value are described as structurally repriced. The Polymarket cross-listed anchor is 24.5% YES and falling (-23pp over 30 days), and the Sept 15 normalization market at 0.45% confirms near-term impossibility. Some tail for Yes remains given ongoing Qatari mediation and a 63%-priced ceasefire-through-Dec-31 market, but ceasefire ≠ 60 transits/day, so I shade modestly below the declining market price.

gpt-5.6-sol

73% conf

Yes	22%
No	78%

The latest PortWatch 7-day average of roughly 6-8 transits is only about one-tenth of the 60-transit threshold, pointing strongly toward No. Continued vessel attacks, the active US blockade, elevated insurance costs, and the collapse of the earlier reopening agreement make a rapid commercial recovery unlikely even if another ceasefire occurs. The Red Sea precedent and dark-fleet behavior further suggest that operator confidence would recover slowly, while Qatari mediation and cleared mines preserve a meaningful path to Yes. I therefore place Yes at 22%, slightly below the 24.5% Polymarket consensus anchor given its accelerating downtrend and the lack of any observed traffic recovery.

5. Devil's Advocate Sonnet 5 · red-team critique

Both forecasts anchor tightly to the falling 24.5% Polymarket price and shade only slightly below it, but the evidence brief's strongest signals (0.45% Sept-15-normal market, Red Sea 2-year partial-recovery precedent, "structural repricing" of insurance, zero outbound transits on Aug 25, only 5 crossings Aug 27) all point toward a much lower probability than 18-22%; neither forecaster explains why they land so far above the near-zero adjacent market despite citing it themselves.

Neither forecast adequately engages with sub-question 6's distinction: the ceasefire-through-Dec-31 market is priced at 63%, but the brief explicitly notes "ceasefire ≠ reopening ≠ 60 transits/day" — this decoupling suggests Yes should be discounted more aggressively than a simple shade below the Polymarket YES price, since even a full ceasefire wouldn't guarantee threshold-crossing traffic given the Kamco Invest point about needing "full reopening plus 2-3 month backlog clearance."

Both forecasts treat "mines cleared" and "Qatari mediation" as meaningfully increasing Yes-probability, but the brief shows these signals are already stale/priced-in as of early September (attacks continuing despite cleared mines, Sept 2 UKMTO reporting two more tanker attacks) — this is double-counting old bullish signals against a deteriorating trend line.

Neither forecaster addresses the PortWatch measurement-gap risk noted in the brief (dark-fleet transponder-off vessels may not register, biasing the 7DMA low even if physical traffic partially recovers) — this is a structural upside risk to "Yes" that's mentioned in the gaps section but never incorporated into either probability.

Both converge to nearly identical probabilities (18% and 22%) using nearly identical reasoning and the same anchor, producing a false sense of robustness; neither explores a tail scenario where a sudden geopolitical resolution (e.g., regime change, major US-Iran deal) causes a rapid V-shaped recovery, which historical Gulf tanker-war endings sometimes show, unlike the slower Houthi/Red Sea analogue cited.

Neither forecast weighs the reference-class conflict directly: the 2019 Gulf tanker incident precedent showed recovery "within weeks" while Red Sea took years — both forecasts default to the pessimistic Red Sea analogue without justifying why this conflict (state-actor mining/blockade with US military involvement) is more comparable to Red Sea (non-state Houthi harassment) than to the faster 2019 case.

6. Aggregator Fable 5.1 · final calibrated forecast

19% (68% confidence)

Yes: 19% No: 81%

The PortWatch 7DMA sits at ~6-8 transits/day, roughly one-tenth of the 60 threshold, with an active US blockade, continued tanker attacks into September, a collapsed June MOU that never restored near-normal traffic even while it held, and structurally repriced war-risk insurance. Reaching 60 by Dec 31 requires a durable settlement by roughly October plus a rapid multi-week rebound in operator confidence and backlog clearance, and the brief's PortWatch measurement gap (dark-fleet ships not registering) cuts against Yes rather than for it, contrary to the critique. The 0.45% Sept-15 market is not a fair comparator given the four-month horizon, so I do not push far below the liquid $10.5M Polymarket anchor of 24.5%, but the accelerating downtrend and lack of any observed recovery justify a modest shade below it. Both forecasters drew consistent inferences from the sub-questions; I land near their consensus at 19% Yes.

Pipeline Timing

Total pipeline time: 291.3s

Per-tool research timings shown in the Research section above.