Will CMI declare a Millennium Prize Problem solved by December 31, 2026?7%4.0Strait of Hormuz traffic returns to normal by December 31?19%5.0Kanye West performs in Russia by October 31?33%12.5All Millennium Prize Problems solved before 2030?19%24.5Will Ethereum reach $2,600 in September?75%7.0Will Flávio Bolsonaro finish in second place in the first round of the 2026 Brazilian presidential election?83%8.5Will Bitcoin reach $82,500 in September?63%4.0Will Luiz Inácio Lula da Silva finish in second place in the first round of the 2026 Brazilian presidential election?16%6.3All Millennium Prize Problems solved before May 2027?11%8.8Will bitcoin go below 9.000$ at the end of this month?6%44.1Will United Russia (ER) gain the most seats in the next Russian parliamentary election?74%5.0OpenAI is sued over Navier-Stokes?11%1.9Will Anthropic announce a claimed solution to Navier–Stokes before the end of 2026?2%41.8Will WTI Crude Oil (WTI) hit (HIGH) $95 in September?86%0.5Will Gadi Eizenkot be the next Prime Minister of Israel?58%5.1Will OpenAI discover a room temp superconductor in 2026?6%10.3
PolymarketGeopoliticsUpdated 14m ago

US x Iran Effective Ceasefire by September 30?

Market probability
72.0%
+1 percentage point
over 24 hours71.0%72.0%
21 days until the qualification deadline
Latest eligible start date: September 30, 2026 at 7:59 PM ET
The market can resolve after this date while a qualifying period defined in the rules completes.

Confirmed repricing; the market is settling at the new level.

The pricing is supported by healthy trading volume and market depth, a tight spread.

How credible was the move?

Three separate questions — a move can be genuine while the latest price is still settling. Methodology →

Move validity

Is the move backed by real trading and depth?

Strong

The pricing is supported by healthy trading volume and market depth, a tight spread.

Consensus stability

Has the market settled at the new probability?

Forming

Movement has slowed (1 point over six hours) but the market has not fully settled.

Contract clarity

Will the rules resolve without ambiguity?

High

The resolution rules are relatively specific, with a named source and a defined deadline.

Recent trade activity$85.9K traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

This market will resolve to “Yes” if there is a continuous 14-day period during which the United States does not take a qualifying military action against Iran that begins at any time between market creation and the specified date, 11:59 PM ET. Otherwise this market will resolve to “No.” The first day of the 14-day period will be the calendar date (ET) after the most recent qualifying military action (or the date of …

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

This market will resolve to “Yes” if there is a continuous 14-day period during which the United States does not take a qualifying military action against Iran that begins at any time between market creation and the specified date, 11:59 PM ET. Otherwise this market will resolve to “No.” The first day of the 14-day period will be the calendar date (ET) after the most recent qualifying military action (or the date of market creation, if no qualifying action has occurred). The period runs through 12:00 PM ET on the 14th calendar day. This market resolves to “Yes” if any such period is completed where the most recent qualifying military action occurred on or before the specified end date (ET). A qualifying military action refers to an air strike or a surface-to-surface missile strike, initiated by the United States, that directly impacts Iran. An air strike includes bombs, air-to-surface missiles, and air-launched drones. A surface-to-surface missile strike includes one-way attack drones and surface-to-surface missiles such as cruise or ballistic missiles. The following actions do not constitute a qualifying military action: Munitions destroyed or intercepted before impact; Surface-to-air missile strikes; Small-arms fire; Ground incursions; Cyber operations; Naval gunfire and artillery fire; Howitzers, artillery pieces, mortars, and rocket artillery (e.g. MLRS systems); Minor surface-to-surface strikes, including short range loitering munitions, FPV drones, and ATGM strikes; Any threat, authorization, or announcement of force that has not been executed. Any munition that is intercepted or destroyed before impact does not constitute a qualifying military action. Debris, fragments, or any wreckage from intercepted munitions that land on Iran do not constitute a military action regardless of any damage incurred. A military action will be considered to impact Iran if it directly impacts the terrestrial territory of Iran, including any internal waters. Maritime territory and airspace are not encompassed. Where territorial borders are disputed, all territory claimed by and under the de facto control of Iran as of market creation will qualify. The occurrence, attribution, and timing of a qualifying military action will be primarily determined based on a consensus of information available from the resolution sources. Where multiple sources conflict regarding the occurrence, attribution, or timing of a relevant military action, this market will remain open until the earlier of: i) the confirmation of the occurrence, attribution, and timing of the action based on a consensus of information available from the resolution sources or ii) 3 full calendar days (ET) from the date of the first credibly reported evidence of the action. If this period would extend past the end date, this market will remain open to allow for 3 full calendar days to pass. If, at the end of the third calendar day, conflicting reports remain as to the occurrence, attribution, or timing of the action, the action will be judged based on the totality of information available from the resolution sources at that time. No single statement, denial, or presentation of evidence will govern where it is contradicted by the totality of information. The resolution sources for this market will be official information from the governments and militaries of the United States and Iran and credible reporting.

What could move this market next?

  • The latest eligible start date passesSeptember 30, 2026 at 7:59 PM ET

    After this date, no new qualifying period can begin under the rules.

  • Completion of the qualifying period defined in the rules

    Resolution follows once the defined period finishes without a disqualifying event.

Derived from the contract's own mechanics as of Sep 9, 2:31 AM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Probability by deadline

The same event, priced across deadline contracts on this venue.

  • By Sep 454.5%
  • By Sep 30 (this market)72.0%

Extending the deadline from Sep 4 to Sep 30 adds about 17.5 percentage points of implied probability.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: high · expected error ±15 pts.

TrendingLegacy movement classifier: meaningful

What's happening

low classifier confidence
Trending

A sustained one-directional drift. This can be a genuine trend or crowd herding; watch whether liquidity and breadth confirm the move.

  • Directional drift sustained across 1h / 6h / 24h windows
  • Executed flow sell-heavy (89%)

Read the latest price with caution; conditions make it an unreliable summary right now.

More details — reliability score, dynamics, durability
Reliability score
27Low
Where the price path tends to go next445 observed
  • Stable consensus93%
  • Choppy / mean-reverting3%
  • Trend continuation2%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~3h
PredictabilityStable

Secondary read: leaning toward Trading normally.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Market data

24h volume

$86.9K

Liquidity

$49.7K

Total volume

$152.2K

Category
Geopolitics
Venue
Polymarket
Open interest
Spread
2.0 pts
Best bid
71.0%
Best ask
73.0%
7-day range
70.5% – 72.0%
Resolves
Sep 30, 2026
Change (pts)1H+1.06H+1.024H+1.07D+1.0

Related markets