The Quick Answer
The Quick Answer: The Strait of Hormuz is still effectively closed, and after a week of tanker-for-tanker strikes the market pushed the reopening further out at every date through July 2027. Kalshi's ladder, quoted the evening of September 8, has "normal traffic before January 1, 2027" at 17 to 19 cents, down from 23 to 24 a week ago, and "before July 1, 2027" at 50 to 51, a coin flip that was 54 to 55. Iran's new maritime exclusion zone still has no published coordinates; the tape priced the shooting around it. The full ladder, what the order book says underneath the January quote, and the Sep 9 oil board that finally moved the same way are below.
Stay ahead of the markets.
Daily insights and expert picks on Kalshi, Polymarket, and what's moving markets.
Free forever. Unsubscribe anytime.
On Tuesday Iran's top security official said economic warfare would be answered with a "maritime exclusion zone across the Persian Gulf," Houthi drones and missiles hit four southern Saudi cities and set fires at Aramco sites in Najran and Abha, and US Central Command hit Iranian crude tankers near Kharg Island and Jask for the second time in three days. None of those three things is a ship transiting the strait, and only ships settle these markets. This page has argued since August that announcements price at nothing, and this week is the honest exception: the exclusion zone is an announcement without a map, and the ladder repriced anyway, because the zone arrived wrapped in strikes on both sides and a second front over southern Saudi Arabia. Where each rung went, and what was actually sitting in the order book under the January quote when it printed 16, is the story below.
What Happened On The Water This Week
The sequence runs Saturday to Tuesday. On Saturday, September 5, after Iran's Revolutionary Guard fired ballistic missiles at a US aircraft carrier and a destroyer, both of which CENTCOM said evaded them, US forces permanently disabled two Iranian crude carriers, the M/T Downy off Kharg Island and the M/T Stark 1 near Jask, and destroyed a third, the unladen M/T Kylo, outside the Gulf. CENTCOM called the three part of a "multibillion-dollar shadow network that funds the IRGC," and its commander, Admiral Brad Cooper, set the exchange rate: "If you shoot at two of our ships, we will impose an even higher economic cost — taking out three of yours." A US official called it a "tanker for tanker" policy. The Guards' navy answered the same day, saying it had targeted three tankers on "unauthorised routes" in the strait.
On Sunday the new secretary of Iran's Supreme National Security Council, Mohsen Rezaei, went on state television to preview the zone. It would "begin from the line of the U.S. naval blockade, extend toward the Strait of Hormuz" and continue into the Gulf, and "any ship that enters this area with the intention of passing through the Strait of Hormuz and is identified will be placed on our sanctions list." The boundaries, he said, would follow in the coming days. He called the strait "completely closed." By Monday the traffic data had caught up with the weekend. Kpler, which tracks commodity ships only, counted 2 vessels through the strait on Saturday and 6 on Sunday, and its 10-day average fell to 10 a day, the lowest since May.
Tuesday was the widest day. Iran-backed Houthi forces hit Abha, Khamis Mushait, Jazan and Najran with drones and missiles overnight, wounding 73 people by the Saudi-led coalition's count; the Houthi spokesman framed it as an answer to Saudi airstrikes in Yemen. Fires burned at Aramco sites in Najran and Abha, at Jazan's industrial city and at King Khalid Air Base, and operations halted at some of the energy sites. Rezaei's morning line followed: "Economic warfare will be met by a maritime exclusion zone across the Persian Gulf to the blockade perimeter," plus a claim that Iran's posture toward US warships and bases had been "fundamentally recalibrated," a line that followed state media's claim that a Qassem Basir missile had been fired at US warships, which the US said were not hit. In the afternoon CENTCOM struck Iranian tankers near Kharg Island and Jask again, which US officials tied to a failed Iranian missile launch at a US warship on Monday, and the Guards' navy told crews on tankers in Kuwaiti and Bahraini ports to leave their vessels, calling any ship berthed there a target. The zone itself still had no coordinates when the ladder closed the day. Of the three Tuesday events, two printed on the tape and one did not: the Houthi strikes took the October bid from 2 to 1 in the hour after 8 a.m. Eastern, the afternoon Kharg and Jask strikes took January 2027 to 16 and July 2027 to 48, and the coordinate-less zone, on its own, moved nothing.
These are market prices and model estimates, not predictions of fact and not financial advice. Kalshi is a CFTC-regulated event-contract exchange (18+; availability varies by state).
The Referee Is Behind The News
The rule, quoted from the January 1, 2027 rung, is one sentence: "If the 7-day moving average of transit calls through the Strait of Hormuz as reported by the IMF PortWatch is above 60 before January 1, 2027, then the market resolves to Yes." Only the date changes from rung to rung. Before the crisis the count ran around 85 a day through a waterway carrying about a fifth of the world's oil, so 60 is a clear recovery, not a full one.
The referee is behind the news. As of Tuesday evening IMF PortWatch still ended at August 30, when it logged 6 transit calls, two tankers and four cargo ships, and the week of August 24 through August 30 summed to 30. Kpler's 2 and 6 for last weekend are a different counter, commodity ships only, and they are not what settles anything here. PortWatch counts vessels broadcasting their position through the chokepoint, so a ship that runs dark under escort is, for settlement, a ship that did not pass. A sanctions list is not a ship either. That design is why six months of announcements have not moved the board toward Yes: an April 8 ceasefire, an April 17 Iranian reopening notice, the June 17 Islamabad Memorandum and a July truce all failed to lift the average out of single digits, and the July 1, July 15, August 1, August 15 and September 1 rungs all finalized as No. An exclusion zone is the mirror image of those, an announcement that traffic will not resume, and the count will confirm or ignore it the same way.
The Ladder After The Exclusion Zone
| Deadline | Sep 8, evening (bid / ask) | Sep 7 close | Sep 2, late (bid / ask) | Aug 31 (bid / ask) | Panel median (Sep 2 night) |
|---|---|---|---|---|---|
| October 1, 2026 | 1¢ / 2¢ | 2¢ | 2¢ / 3¢ | 3¢ / 4¢ | 2% |
| November 1, 2026 | 6¢ / 7¢ | 7¢ | 7¢ / 8¢ | 11¢ / 12¢ | 5% |
| December 1, 2026 | 11¢ / 12¢ | 13¢ | 15¢ / 16¢ | 19¢ / 20¢ | 10% |
| January 1, 2027 | 17¢ / 19¢ | 18¢ | 23¢ / 24¢ | 26¢ / 27¢ | 16% |
| April 1, 2027 | 39¢ / 40¢ | 41¢ | 42¢ / 43¢ | 46¢ / 48¢ | 32% |
| July 1, 2027 | 50¢ / 51¢ | 53¢ | 54¢ / 55¢ | 60¢ / 62¢ | 45% |
| January 1, 2028 | 62¢ / 63¢ | 61¢ | 61¢ / 66¢ | 69¢ / 71¢ | — |
| January 1, 2029 | 69¢ / 70¢ | 69¢ | 70¢ / 74¢ | 75¢ / 77¢ | — |
Kalshi series KXHORMUZNORM, "normal traffic before" each date. Live quotes pulled at 5:56 p.m. Eastern time on September 8, 2026, against Monday's closing price, last Wednesday's late quotes and August 31, the day after the Larak Island strike. The panel column is the median of seven models that re-read the ladder price-blind on the night of September 2; it has not been re-run. The 2028 and 2029 rungs shown trade far thinner than the 2026-2027 board, so read them loosely. Lifetime volume across the series is 30.8 million contracts, with 9.2 million contracts of open interest. The Sep 2 and Aug 31 columns are this page's prior editions' quotes; the panel column is the seat median from the September 2 read, as published in that edition.
More live boards from the same panel: How high will oil go in 2026 (WTI above $115 before December 31 at 27¢ / 30¢) · Gas prices 2026 (the AAA national average above $5.00 at any point before December 31 at 29¢ / 32¢) · Kalshi's commodity boards explained. Prices fetched the evening of September 8, 2026.
Start with the rung everybody trades. "Normal traffic before October 1" is now a 1-to-2-cent market, and it did 37,000 contracts in the 24 hours to Tuesday evening, more than any other rung, nearly all of them at 2 cents, with the bid slipping from 2 to 1 in the hour after 8 a.m. Eastern as the Houthi strikes crossed the wires. There was almost no probability left to remove, so the move is not about probability. Traders are paying a cent or two to be sure, on 1.1 million contracts of open interest, that the next three weeks bring no 7-day average above 60. At those prices the contract is the market's version of the sentence Rezaei used on Sunday.
December and January did the visible repricing, and the tape says when; July did the biggest. December 1 fell from 13 cents at Monday's close to 11 to 12, with 17,000 contracts printing in a single pre-dawn hour Tuesday, and January 1, 2027 traded as low as 16 in the hour after 3 p.m. Eastern, the hour the second Kharg and Jask strikes were being reported, before settling at a 17-to-19 quote. Here is the part I promised. Under that quote, the bid at 17 was 18 contracts. The real money on the buy side sat at 15 cents, more than 33,000 contracts deep, with another 8,700 at 16; on the sell side the first real wall was 10,000 contracts at 23. Read the January market that way and it is not a 17-to-19 market at all. It is a market where patient buyers say 15 and patient sellers say 23, and the touch prints wherever the last impatient trader lands. The 16 print was one of those. The honest number for "reopens before next year" is a range in the high teens with a floor at 15, not a point.
The detail that matters for every rung on this page: the touch says 17 to 19, the book says 15 and 23. When a market this deep prints a 16, ask who was resting where, not what the news said.
July 2027, the market's answer to "is routine shipping back ten months from now," is the rung I keep coming back to, and its week was a slide with two violent hours in it. It traded as high as 60 cents on Friday night, before the Saturday strikes, held 55 to 57 through Saturday, then took 9,900 contracts on Sunday evening, hours after Rezaei's preview aired, and printed a 47-cent low before closing that hour at 53. The hour after 3 p.m. Tuesday hit it again: 9,500 contracts, 51 down to 48, and a 50-to-51 quote at the close. On August 31 this rung was 60 to 62. Larak Island took more off the near rungs than the far ones; the tanker war took the far ones too, and moved the eventual reopening from better-than-even to a coin flip. April 2027, at 39 to 40, gave up three cents in the same week.
The far rungs are the counterweight, and they are thin enough that I would not lean on them. January 2028 ticked up a cent to 62 to 63 on about a hundred contracts while everything nearer fell, and January 2029 sat at 69 to 70. If you want a single reading of the whole ladder, it is that the market moved probability out of 2026 and the first half of 2027 and parked it between July 2027 and January 2028: the gap between those two rungs was about 9 cents last week and is 12 now. Traders still expect the strait to reopen. They expect it later, and this week they stopped expecting it soon.
The 'Trump Strait' Market
The rename board, KXHORMUZRENAME, is a week from its first deadline and has priced itself to the outcome. "Will Trump rename the Strait of Hormuz before September 15" is quoted 0 to 1 cent on 21,000 contracts of open interest, and the October 1 rung is 1 to 3. The market settles on something stricter than a post. Its rule, verbatim, pays Yes only if Trump "has taken any signed executive action renaming the Strait of Hormuz to any different name" before the deadline, and a social-media post is not a signed action. The president's September 2 post got the September 15 rung as high as 43 cents in its first hours; his "it was just thrown out there" in the Oval Office the same afternoon sent it to single digits, and a week of tanker strikes has not produced a signature. Our seven-model panel put it at 5 percent by September 15 and 9 percent by October 1 on the day it listed. The September 15 rung closes next Tuesday, and the result goes on this page.
The rename board still does one job for readers of the ladder: it explains how "under U.S.A. control" and a falling reopening price coexist. The president's claim is about who escorts ships and who has swept the lanes, and the White House's August 28 release counted escorted vessels and barrels to prove it. The ladder counts the IMF's routine commercial transits, which are in single digits. Washington counts barrels. Kalshi counts ships. This week added a third party to the same ambiguity: an exclusion zone that sanctions ships for transiting a strait its author says is already closed.
The Weekly Count Board Closed Without A Number
Kalshi's weekly crossing board, KXHORMUZWEEKLY, is where a real reopening would show up first, and the August 31 to September 6 edition, the first to price the tankers and last Tuesday's strikes, closed at 9 a.m. Tuesday with PortWatch's count still unpublished. Its final prints are the market's guess at the referee's number: "above 20" last traded at 76 cents, "above 25" at 8, "above 30" at 2. The market expects the week to land between 21 and 25 transit calls, below the 30 the prior week settled at, and it settles when PortWatch prints.
The new week's board, September 7 through 13, is the more interesting object, because it is pricing the exclusion zone in real time. "Above 20" is 86 to 87, "above 25" is a 50-to-58 market, and "above 30" is 20 to 21, on a book of a few hundred to a couple of thousand contracts a rung, so argue from the spread rather than the volume. Kpler had its 10-day average at 10 a day going into this week, so an 86-cent "above 20" is pricing a rebound the weekend did not show, and the gap is the two counters again: PortWatch counts every transponder-on vessel, including the dry-bulk and general cargo ships that made up 17 of the 30 in the August 24 to 30 week, and Kpler counts commodity carriers. The thinner annual-peak board, KXHORMUZAVG, moved with the ladder: its "above 60" rung, nearly the same question as the ladder's January 2027 rung, is 12 to 13 against the ladder's 17 to 19, a gap that measures book depth more than any disagreement about ships.
There is a second venue on the same referee, and the gap between them widens with the calendar. Polymarket's "traffic returns to normal" contracts resolve on the same PortWatch 7-day average at or above 60; the two venues agree on September, Polymarket's October 31 contract at 7.5 cents sits a cent above Kalshi's November rung, and its December 31 contract traded at 23.5 cents Tuesday evening on about $10.6 million of volume, four to six cents above Kalshi's January 1 quote. The rules differ by a hair, at-or-above 60 against above 60 and December 31 against January 1, not by five cents. Two venues that far apart on a question this liquid means neither number is settled, which is one more reason to read the Kalshi January rung as the 15-to-23 range in its book rather than the 17-to-19 at the touch.
What The Oil Board Prices That The Traffic Board Does Not
Last week the two boards disagreed: the traffic ladder fell while the oil board barely moved. This week they agreed. Brent for November rose 2.2 percent Tuesday to $99.16, touching $99.22, its highest since July 24, and October WTI climbed 3.3 percent to $94.46, with a $94.60 high that was its best since June 8. Tim Waterer of KCM Trade told Reuters the move reflected "genuine physical tightness," with tanker flows through Hormuz "well below normal," and "a clear geopolitical risk premium,". The same note carried two forecasts that map onto the ladder. Goldman Sachs raised its December Brent forecast by $5 to $85, and ANZ said full throughput would not return "until late Q1 or early Q2 2027." That ANZ window is the ladder's April 1 and July 1, 2027 rungs, which the market has at 39 to 40 and 50 to 51. The bank and the board are describing the same spring.
Kalshi's daily oil board is where the same tape shows up in cents. KXWTI-26SEP0914 asks whether WTI's September 9 print lands above each level, and Tuesday's move walked the whole ladder up by about two dollars.
| WTI On Sep 9, Above… | Sep 8, evening (bid / ask) | Sep 7 quote (bid / ask) |
|---|---|---|
| $91.99 | 88¢ / 90¢ | 56¢ / 60¢ |
| $92.49 | 81¢ / 84¢ | 48¢ / 52¢ |
| $93.49 | 64¢ / 65¢ | 33¢ / 37¢ |
| $93.99 | 54¢ / 58¢ | 26¢ / 30¢ |
| $94.49 | 44¢ / 48¢ | 20¢ / 24¢ |
| $94.99 | 35¢ / 37¢ | 15¢ / 19¢ |
| $95.99 | 18¢ / 21¢ | 8¢ / 12¢ |
| $96.99 | 11¢ / 12¢ | 4¢ / 8¢ |
| $97.99 | 4¢ / 6¢ | 1¢ / 4¢ |
Kalshi event KXWTI-26SEP0914, "Oil Price (WTI) on Sep 9, 2026," selected rungs, quoted at 5:56 p.m. on September 8 against Monday's closing bid and ask, labeled the Sep 7 quote. The board settles on Wednesday's print, so these are one-day contracts and move with every tick.
The row to read is $94.49, the coin-flip line at 44 to 48. On Monday that rung was a 20-to-24 market and the coin flip sat near $92.49; by Tuesday evening the 50-cent line sat within a quarter of where WTI closed. In plain terms the oil board prices Tuesday holding rather than a further spike on Wednesday: the $96.49 rung is 13 to 16 cents and above $98 is a nickel. The longer oil boards say the same thing. Kalshi's KXWTIMAX series, which asks whether WTI's front-month settle prints above a given level before December 31, still has "above $115" at 27 to 30 cents, where last week's edition of this page found it, and its September board has "above $100 by September 30" at 24 to 31. Put the boards side by side and the shape is consistent: the traffic ladder says roughly four chances in five that the 7-day average never clears 60 before January, and the oil board says crude near $100 is the price of that, not the start of something worse. The cleanest way both are right is still the one this page has argued since August: the barrels keep moving, under escort, by pipeline and on tankers that go dark, while the ships that would settle the ladder do not get counted. Our oil-price board page tracks the December ladder on its own.
The Blind Panel, A Week Later
The original read of this board came on August 3, price-blind, and put a reopening before January 2027 at 35 percent and before July 2027 at 58. On the night of September 2 we asked again: seven seats, three Claude models plus GPT-5.5, Gemini 3.1 Pro, Grok 4.5 and Kimi, received the record and the PortWatch dailies but no prices, and each priced the whole ladder in one pass. The blind median fell to 16 percent on January 2027 and 45 on July 2027, seven to ten points under the market that night.
A week later the market has walked down to the panel. January 2027 at 17 to 19 is one to three points above the seat median of 16, and July 2027 at 50 to 51 is five above the 45. The panel has not been re-run for this edition; the trigger for the next read is the PortWatch print, not the next communiqué. The two sentences from the September 2 read that anticipated this week are worth keeping. Claude Fable's: "AIS-off escorted convoys don't even register in PortWatch's count," so US-controlled flows "are invisible to PortWatch until ... independent commercial transits resume." And Grok's, the high seat at 34 on January, naming the one force pushing the other way: whether crude near $100 "forces a quiet corridor that shippers actually use." Every number is graded in public on the full scoreboard when the rungs settle.
Model estimates generated the night of September 2, 2026, price-blind, one pass per model across the full ladder; the blend is the seat median. These are model estimates, not predictions of fact and not financial or trading advice. Models are frequently wrong; the market price reflects real traders' money. The August 3 read (six seats) stays on the public record and is graded when these rungs settle.
The Nuclear-Deal Board Points The Same Way
The linked ladder, KXUSAIRANAGREEMENT, prices a signed US-Iran nuclear deal by each deadline, and it moved the way the reopening ladder did: nothing near, something far. Its "before December 1" rung is 5 to 6 cents and "before January 1, 2027" is 7.5 to 8, unchanged in a week that included Rubio's "that ship has sailed" and a tanker war. The rung that firmed is "before January 1, 2028," now 21 to 25 from a 17-to-18 quote at Monday's close, with "before January 20, 2029" at 32 to 34. Read the size before the price: the 2028 move came on about 1,700 contracts against 33,000 of open interest, and its spread opened to four cents, which is a thin book being lifted, not a repricing. It is the same "later, not never" trade that put a cent on the reopening ladder's January 2028 rung on about a hundred contracts, showing up in two books at very different depths. That is the reading the reopening ladder gives in a different currency: the June memorandum is dead, and whatever comes next belongs to a later year.
The Bottom Line
The purest measure of the week is that "normal traffic before October 1" is a 1-to-2-cent market, and 37,000 contracts paid two cents for it on Tuesday. For that contract to pay, the exclusion zone that does not yet exist on a map has to be withdrawn, both navies have to stop hitting tankers, insurers have to reprice a Gulf where Aramco sites burned on Tuesday morning, shippers burned by four failed reopenings have to commit tonnage, and the PortWatch 7-day average has to climb from single digits to above 60, even once, all in three weeks. Nobody is arguing that. The argument on this board is between December and next July, and it is being conducted in an order book where the January buyers say 15 and the sellers say 23.
Three prints decide the next edition. The August 31 to September 6 count, which settles the weekly board that closed Tuesday morning and tells us whether last week's traffic was in the low 20s the market expects. The coordinates of the exclusion zone, if Iran publishes them, which turn a sentence into something insurers can draw on a chart. And the rename board's September 15 close, the first of its two rungs to finalize. This page gets re-read when the PortWatch number lands.
When PortWatch posts the September days, the arithmetic to run is simple: the weekly board settles on the seven-day sum, the ladder settles on the seven-day average, and one day above 60 does nothing unless the six around it average with it. Our guide to how Kalshi settlement works walks through that math for metric-settled contracts.
More on this: How Kalshi Settlement Works · Kalshi Commodity Markets: The Oil And Energy Boards · Model Verdict Scoreboard: Every Graded Call · Beginner's Guide To Kalshi
Hottest Prediction Markets Right Now
- 2028 Democratic presidential nominee · $166M traded
- 2027 Pro Football Champion · $51M traded
- Pro Baseball Champion · $40M traded
- Bitcoin price at the end of 2026 · $30M traded
- 2027 Pro Basketball Champion · $19M traded
Every market above links to our full AI model verdict; browse them all on the OddsShopper prediction markets hub, and see how every settled call actually scored on the full graded scoreboard.
