US-Iran Blockade End Odds on Polymarket: August 2026

Two days ago, Iran and Oman were reportedly "very close" to a framework for reopening the Strait of Hormuz. As of 2026-08-09 07:29 UTC, Polymarket's "US announces end of Iranian blockade by August 15?" trades 28c bid / 29c ask, down from a 64.5c peak on Friday evening. The August 31 contract fell alongside it, from 79.5c to 58c bid / 59c ask. The reversal traces to a single document: on Saturday, August 8, a senior Iranian security official published a list of conditions for reopening the strait that the US has shown no sign of accepting. Numbers below are from Gamma and the CLOB order book, fetched at that time.

What Iran actually asked for

Mohammad Bagher Zolghadr, secretary of Iran's Supreme National Security Council, published Iran's terms through Iranian state media on Saturday: end the US naval blockade, lift sanctions, withdraw US military forces from the region, stop strikes on Iran and its regional allies "forever," pay war reparations, and release frozen Iranian assets. Iranian Foreign Minister Abbas Araghchi had said just a day earlier that talks with Oman over a shipping-corridor framework were "very close" to done - but Araghchi also cautioned that progress with Oman "is not a sign of the reopening of the Strait of Hormuz," a hedge that reads differently in hindsight. The demand list didn't just add friction to the Oman track, it moved the goalposts: a technical routing agreement between Tehran and Muscat can't deliver sanctions relief, a troop withdrawal, or war reparations. That's a list for Washington, and nothing about it points to an August resolution.

Both near-dated contracts gave back a weekend of gains

The market had been drifting up into the weekend on the same Iran-Oman optimism Araghchi later walked back. The chart shows the full round trip - a Friday-evening high on hope, then a steady bleed once the demand list started circulating Saturday afternoon:

The sharpest single-hour drop landed between 15:30 and 16:30 UTC on Saturday, the August 15 contract falling from 44.5c to 36.5c in that window alone, right as the demand list started circulating in Iranian and Western media. From there both contracts ground lower through Saturday night and into Sunday morning rather than snapping back - a pattern that reads as the market absorbing the story over several news cycles, not reacting to one headline and then second-guessing itself.

Pessimism is heaviest up close, lighter further out

This event runs a full ladder of end-dates, and the 24-hour move shrinks the further out you look - the market thinks Zolghadr's list is a real obstacle this month, less so by year-end:

US ENDS IRANIAN BLOCKADE BY...    PRICE    24H
Aug 15                             28.5c  -30.0c
Aug 22                             35.0c  -35.5c
Aug 31                             58.5c  -16.0c
Sep 30                             78.0c  -9.5c
Oct 31                             86.5c  -4.0c
Dec 31                             91.9c  -3.6c

Every date fell, but not by the same amount - August 22's 35.5c drop is the ladder's biggest, while December 31 barely moved. That shape is the market saying the same thing two ways: a resolution inside the next three weeks now looks unlikely, but a US-Iran deal to lift the blockade sometime before the year ends is still seen as more likely than not. Demanding troop withdrawals and war reparations reads as a negotiating opener, not necessarily Iran's final position - traders aren't pricing this war as permanent, just this month's timeline as dead.

Tight spreads say this is a real repricing

Both near-dated contracts are trading with a 1c spread and real size resting on either side, not a handful of trades pushing a thin book around:

TOP OF BOOK, 2026-08-09 07:29 UTC
By Aug 15   bid 28c x 474    ask 29c x 3,416
By Aug 31   bid 58c x 760    ask 59c x 15

$205,303 changed hands on the August 15 contract in the past 24 hours, and $67,544 on August 31 - real volume behind a real move, on an event that's traded $1.11M total in the same window. That's a market that's actually digesting a diplomatic setback, not one where illiquid noise produced a scary-looking chart.

This isn't the traffic-normalization ladder

Polymarket runs a second series on the same underlying crisis - whether Hormuz shipping traffic actually returns to normal, covered here on August 6 - and it's easy to conflate the two. They're not the same bet. This market resolves on a US government announcement ending its own blockade; the traffic series resolves on IMF Portwatch data showing ships actually moving again, regardless of what either government says. An announcement could land without traffic recovering for weeks, or - less likely given this week's demands - traffic could quietly pick back up without either side making a formal statement. Iran's list makes the announcement look further away right now; whether it also delays the ships is a separate question the other ladder is built to answer.

From the terminal, not a headline scroll

A dated ladder like this one packs a dozen related contracts into a single event, each repricing by a different amount on the same story. In polymarket-tui, every bracket in an event lists its price and 24-hour move side by side, so a demand list circulating on a Saturday shows up as a shrinking ladder of green-to-red moves, not a dozen tabs to check one at a time.

$ uv tool install polymarket-tui
$ polymarket-tui

The install page has Homebrew and one-liner options.