Polymarket prices “Strait of Hormuz traffic returns to normal by August 31?” at 12.5¢ YES — a 12.5% market-implied probability — but our decomposition of blockade-end odds and physical ramp-up constraints puts the true number near 6.5%, leaving the value on the NO side at 87.5¢, an edge of roughly 6 percentage points (pp).
The strait has been effectively closed to commercial shipping since February 28, 2026, and a laden LNG carrier was struck by a cruise missile while transiting as recently as August 1 (Polymarket, August 3, 2026; Windward). For this contract to pay YES, the IMF PortWatch seven-day moving average of transit calls must reach 60 before September 1 — from roughly 25 a day in early July. This Deep Dive walks the resolution math, the honest case for the 12.5¢ hopefuls, and the specific announcements that would flip the read.
The Bet at a Glance:
• Market: “Strait of Hormuz traffic returns to normal by August 31?” — Polymarket, August 3, 2026
• Price: 12.5¢ YES = 12.5% implied probability; $615,778 in 24-hour volume, $5.78m lifetime, ~$515,000 liquidity — Polymarket, August 3, 2026
• Our estimate: ~6.5% true probability of YES — decomposition model, August 3, 2026
• Edge: ~+6pp on the NO side (our ~93.5% vs the market’s 87.5%) — our model
• Resolution trigger: IMF PortWatch 7-day moving average of “Arrivals of Ships” ≥60 on any date before September 1 — Polymarket resolution rules
• Current traffic: ~25 transit calls a day in late June–early July vs ~100 a year earlier — Statista/IMF PortWatch
• Disconfirmation: a verified US blockade-lift and safe-corridor announcement before roughly August 10 — see “Where this bet breaks”
Methodology: how we built the 6.5%
Our true-probability estimate decomposes the question into two stages. First, the probability that hostilities and the US blockade effectively end by mid-August — for which we lean on Polymarket’s own related contracts as the best live anchor: “US announces end of Iranian blockade by August 15, 2026?” trades at 45.5¢ and the August 7 version at 19.6¢ (Polymarket, August 3, 2026). Second, the conditional probability that traffic physically ramps from ~25 daily transit calls to a sustained seven-day average of 60 in the two to three weeks that would remain — estimated from the June ceasefire-window rebound data, current war-risk insurance pricing, and mine-clearance verification timelines reported by industry press. Multiplying 45.5% by a ~12% conditional ramp probability, plus a ~1pp allowance for a surprise comprehensive deal in the first week of August, gives ~6.5%. Caveats: the conditional ramp number is a judgement call built from one precedent and soft inputs, and thin related markets can themselves be mispriced. We treat anything under 3pp as noise; 6pp clears our bar, barely.
The market, the price and the 60-ship trigger
The Polymarket contract is precise in a way most headlines about the strait are not. It resolves YES only if IMF PortWatch publishes a seven-day moving average of daily transit calls — container, dry bulk, roll-on/roll-off, general cargo and tanker arrivals combined — of 60 or more for any date between market creation and August 31, 2026. No diplomatic communiqué, no reopening ceremony, no single convoy counts. Sixty ships a day, averaged over a week, in the data.
That threshold is worth staring at from both directions. Against a pre-crisis baseline of roughly 100 daily arrivals (Statista, drawing on PortWatch data), 60 is only about 60% of normal — a deliberately achievable bar. Against the reality of roughly 25 transit calls a day between late June and early July, and single-day counts as low as 10 in late July per independent trackers, it is a two-and-a-half-fold increase that has to hold for a full week before the month ends. Because the metric is a seven-day average, the de facto deadline is not August 31 at all: shipping would need to be running at effectively normal volumes by roughly August 24 for the average to clear in time.
Is YES at 12.5¢ value on Polymarket’s “Strait of Hormuz traffic returns to normal by August 31?” market? On our numbers, no. The contract pays out only if IMF PortWatch records a seven-day moving average of 60 or more transit calls before September 1, and the strait was still averaging roughly 25 arrivals a day in early July — with a missile strike on a laden LNG carrier recorded as late as August 1. Our decomposition combines Polymarket’s own 45.5¢ price on a US blockade-end announcement by August 15 with a roughly 12% chance that traffic could physically ramp to the threshold in the days remaining, and lands near 6.5%. That makes YES roughly twice fair value and puts the value on the NO side at 87.5¢ — a modest but real edge of about 6pp, with the important caveat that NO’s maximum return is capped at about 14% over four weeks.
Liquidity is not the problem here: $5.78m has traded lifetime, $615,778 in the last 24 hours, with about $515,000 of order-book liquidity (Polymarket, August 3, 2026). This is one of the deepest geopolitical markets on the platform, which makes the pricing anomaly across the date ladder — examined below — more interesting, not less.
| Polymarket contract (YES) | Market price | Implied prob | Our estimate | Edge (pp) |
|---|---|---|---|---|
| Traffic normal by August 15 | 2.15¢ | 2.15% | ~1% | −1 |
| Traffic normal by August 31 | 12.5¢ | 12.5% | ~6.5% | −6 |
| Traffic normal by September 30 | 22.5¢ | 22.5% | ~18% | −4.5 |
| Traffic normal by December 31 | 57.5¢ | 57.5% | ~55% | −2.5 |
Sources: Polymarket prices snapshotted August 3, 2026; our estimates from the decomposition model described in Methodology. Negative edge = YES overpriced; the July 31 contract resolved NO at effectively 0¢.
“The main takeaway here is that reduced traffic has nothing to do with insurance availability. It’s purely shipowners not wanting to put crews at risk.”
— Steve Ogullukian, Deputy Global Underwriting Director, American P&I Club
(Insurance Business)
The case for YES at 12.5¢: why the hopefuls are not mad
Steelmanning the 12.5¢ buyers matters, because they hold three genuinely strong cards.
First, the diplomatic tape is moving their way. The Israel–Iran ceasefire ladder on Polymarket has resolved YES day after day — the “continues through August 2” contract settled at effectively 99.85¢ — and the market prices the ceasefire holding through August 31 at 68.5¢ and a US–Iran effective ceasefire by August 31 at 74.5¢ (Polymarket, August 3, 2026). Talks via Oman are reportedly live, and the “US announces end of Iranian blockade by August 15” contract at 45.5¢ says the single biggest gating event is close to a coin flip. If you believe an announcement cascades quickly into sailings, 12.5¢ is not obviously wrong.
Second, Hormuz is not the Red Sea, where ships could simply keep sailing around the Cape of Good Hope indefinitely. There is no alternative route for most Gulf crude, condensate and LNG; pipeline bypasses via Saudi Arabia and the UAE cover only a fraction of pre-war flows. Every producer on the Gulf — and every importer in Asia — has an overwhelming commercial incentive to restart transits the moment guns fall silent. When a ceasefire window opened in June, roughly 172 ships transited in the week of June 17 (Insurance Business, 2026) — proof that owners will move fast when they judge the risk acceptable. Mr Ogullukian’s point above cuts the same way: cover exists; what is missing is confidence, and confidence can return quickly.
Third, the bar is 60, not 100. The market does not require “normal” in the colloquial sense — it requires 60% of the old baseline for one week. A determined, state-escorted resumption — convoys, naval escorts, a $40bn US Development Finance Corporation reinsurance backstop already sitting unused (Insurance Business) — could in principle compress a months-long recovery into weeks. That is the YES thesis: announcement by mid-August, surge to a deliberately modest threshold, paid by August 31.
The case against: the ramp is the problem, not the ceasefire
The weakness in the YES case is that its first card is priced but its second is not. Even granting the 45.5% blockade-end probability, the conditional ramp assumption fails almost every reference point we can find.
Start with the only live precedent. That June ceasefire window rebound — 172 ships in a week — works out to roughly 25 a day: a rebound to about a quarter of baseline, not 60% of it. Traffic then collapsed again when the blockade resumed and tankers came under fire. As of August 3, independent trackers still list the strait as closed to commercial traffic on day 155, maritime intelligence firm Windward reported a Qatari-cargo LNG carrier struck by a land-attack cruise missile mid-transit on August 1, and two further tankers reported evading suspected attacks on August 3. Roughly 59 tankers in the region are running dark with transponders off. This is not a market waiting on paperwork; ships were being shot at 48 hours before this article’s price snapshot.
Then the insurance stack. War-risk premiums peaked near 10% of hull value against 0.125% pre-crisis, and even post-ceasefire discounts only brought hull war rates to around 2% — with a single Suezmax voyage quoted at $7.5m at the peak, seven tankers hit at an average $250m replacement value, and four seafarers killed (Insurance Business, 2026). Six P&I clubs withdrew cover at the height of the crisis. Shipping associations are demanding independently verified mine clearance before resuming normal operations, and broker projections reported by industry press do not see the Joint War Committee even beginning a phased downgrade of the Hormuz listed area before Q4 2026. Xeneta’s best case for full container-shipping recovery is mid-September; Nikos Petrakakos of maritime investor Tufton pointed CNBC to the Red Sea, where “the ceasefire agreement was last January and traffic has not returned.”
So is NO at 87.5¢ the value side of the Hormuz August 31 market? Our analysis says yes, with honest caveats about what that means. The seven-day-average mechanics mean effectively normal sailing volumes must be in place by about August 24 — under six weeks after a July that averaged ~25 transit calls a day, through a strait where a tanker was hit on August 1, with war-risk premiums still multiples of pre-crisis levels and mine-clearance verification outstanding. Our model prices YES near 6.5%, so NO at 87.5¢ carries roughly a 6pp edge — but its maximum return is about 14% over four weeks, and the loss if a shock deal plus state-escorted convoy surge lands early is total. This is a capped-upside, negative-skew position whose edge evaporates if YES drifts below about 8¢. That asymmetry, not the probability, is the real argument for restraint.
“Carriers had to act fast when the conflict escalated and the Strait of Hormuz closed in February, but the return will be far more cautious.”
— Peter Sand, Chief Analyst, Xeneta
(Sourcing Journal)
Raj Abrol, chief executive of insurance analytics firm Galytix, made the structural point to Insurance Business: “Insurance premiums that spiked won’t come down until underwriters believe the risk has genuinely changed. The word ‘fragile’ matters here.” Underwriters, not diplomats, control the ramp — and underwriters move on verified sea-lane surveys, not announcements.
Where this bet breaks
The lean towards NO at 87.5¢ rests on assumptions that could fail. It breaks if ANY of these fire:
- A verified blockade-lift and safe-corridor announcement before roughly August 10. The single trigger that matters most. If the “US announces end of Iranian blockade by August 7” contract (19.6¢ on August 3) resolves YES, three full weeks remain for a state-escorted surge — the conditional ramp probability roughly doubles and our estimate converges on the market’s.
- A single-day PortWatch print above 40 transit calls. Daily arrivals jumping past 40 — from ~25 — would show owners sailing ahead of the insurance market, the June precedent breaking upward, and the seven-day average within reach. Watch the PortWatch chart directly, not headlines.
- The insurance stack capitulating early. Hull war rates quoted below ~1%, withdrawn P&I clubs formally returning, or a joint task force certifying mine-cleared corridors before mid-August would remove the mechanism our conditional 12% leans on hardest.
- The price running away. If YES trades below about 8¢, the edge on NO has been harvested by the market and the remaining return no longer compensates the tail. Above roughly 20¢ on YES with no change in the data, the NO case strengthens rather than breaks — asymmetry matters in both directions.
What to watch between now and August 31
Five tapes, in order of importance. One: the IMF PortWatch Hormuz page itself — the resolution source publishes with a short lag, and the seven-day average is computable from daily prints before Polymarket reacts fully. Two: the blockade-announcement ladder (August 7 at 19.6¢, August 15 at 45.5¢) — the first-stage probability in our model, repriced live. Three: the Israel–Iran ceasefire ladder (August 9 at 90.5¢, August 15 at 78.5¢, August 31 at 68.5¢) — any daily contract resolving NO ends the YES case outright. Four: the Oman-mediated talks, where Tehran denies direct US negotiations while confirming strait-management discussions. Five: the insurance wire — JWC listed-area reviews, P&I club statements and quoted hull war rates. We covered the broader escalation pricing in our deep dive on Polymarket’s US–Iran invasion market, which still trades at 20.5¢ for invasion before 2027; the two markets should move inversely, and days when they rise together flag noise rather than news.
For how we treat resolution-criteria fine print as the actual bet, see our Greenland “paperwork bet” analysis — this market is the same species: the words “60”, “seven-day average” and “PortWatch” are doing more work than the word “normal”. And for the macro shadow this chokepoint casts on rate markets, our September Fed hike deep dive and US recession odds analysis trace the oil-inflation channel directly.
TL;DR
Polymarket prices Strait of Hormuz traffic returning to normal by August 31 at 12.5¢ YES (12.5% implied). Resolution needs an IMF PortWatch seven-day average of 60+ transit calls — versus ~25 a day in early July, a tanker struck on August 1, war-risk premiums still multiples of pre-crisis levels and mine clearance unverified. Our decomposition (45.5% blockade-end by August 15 × ~12% conditional ramp) puts true probability near 6.5%, a ~6pp edge to the NO side at 87.5¢ — capped at ~14% upside. Key disconfirmation: a verified blockade-lift and safe-corridor announcement before about August 10.
FAQ
What are the Polymarket odds for Strait of Hormuz traffic returning to normal?
As of August 3, 2026, Polymarket prices “Strait of Hormuz traffic returns to normal by August 31?” at 12.5¢ YES — a 12.5% implied probability — on $615,778 of 24-hour volume. The date ladder around it: August 15 at 2.15¢, September 30 at 22.5¢, and December 31 at 57.5¢. The July 31 contract resolved NO.
How does the Hormuz Polymarket market resolve?
It resolves YES only if IMF PortWatch publishes a seven-day moving average of daily transit calls (“Arrivals of Ships”) of 60 or more for the Strait of Hormuz on any date before September 1, 2026. Announcements, ceasefires and individual convoys do not count — only the PortWatch data series does.
Is YES at 12.5¢ value?
Our model says no: we estimate the true probability near 6.5%, roughly half the market’s 12.5%. The binding constraint is physics and insurance, not diplomacy — traffic must reach effectively normal levels by about August 24 for the seven-day average to clear by month-end, from ~25 daily transits with attacks still occurring on August 1.
What would change the prediction?
A verified US blockade-lift and safe-corridor announcement before roughly August 10, a single-day PortWatch print above 40 transit calls, hull war-risk rates quoted below ~1%, or formal mine-clearance certification. Any of those would move our estimate materially towards the market price.
Why is the August 15 contract at 2.15¢ while August 31 trades at 12.5¢?
The seven-day-average mechanics make August 15 nearly impossible — normalisation would need to happen this week. The extra two weeks in the August 31 contract buy one plausible path: an early announcement followed by an aggressive, escorted ramp. The market prices that path at ~10pp of extra probability; our model prices it at ~5.5pp. That gap is the entire disagreement.
This article is informational analysis only and is not betting or financial advice. Odds and prediction-market prices move constantly; every price quoted is a timestamped snapshot, not a live line. There is no such thing as a guaranteed bet — past results and model estimates do not guarantee outcomes. Do your own research.
Gambling carries financial risk and can be addictive. 18+ / 21+ depending on jurisdiction. Never bet more than you can afford to lose. If you or someone you know needs help, visit GamCare (UK), call 1-800-GAMBLER (US), or see our Responsible Gambling page.
