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Will the US-Iran ceasefire hold through 28 October 2026?

Resolution: Updated:

In short

The market treats a continued ceasefire as the more likely outcome but not a near-certainty. The single biggest reason is the short window โ€” just four days from today to the 28 October deadline โ€” combined with a strike definition that only counts direct air or missile strikes, not naval gunfire, interceptions or small-scale drone and ATGM use. A reported US air or missile strike on Iranian territory before the deadline would flip this to No immediately.

Editorial illustration for: Will the US-Iran ceasefire hold through 28 October 2026?

How the contract works

A contract on this question settles at $1 if no qualifying US strike on Iran occurs by 11:59 PM Iran Standard Time on 28 October 2026, and at nothing if one does. The rules are specific about what counts: an air strike or a surface-to-surface missile strike โ€” including drones, cruise missiles or ballistic missiles โ€” that directly impacts Iran triggers a No resolution. Intercepted munitions, surface-to-air fire, small-arms exchanges, ground incursions, cyber operations, naval gunfire, artillery, mortars, and minor strikes such as FPV drones or anti-tank guided missiles do not count toward a No. The contract price at any moment reflects what traders collectively think the chance is โ€” a contract priced at 0.30, for example, would imply traders see roughly a three-in-ten chance of a qualifying strike happening before the deadline. Positions can typically be sold before 28 October at whatever price the market has moved to by then.
What the market thinks happens
$100
Yes90%

The event happens

Costs now
$0.90
If you put in $100
$111
No10%

The event does not happen

Costs now
$0.10
If you put in $100
$1,000

Probability

History starts collecting once the event is tracked

How the price has moved

The available data shows a Polymarket consensus in the low-to-mid 80s percent range with $519,127 in total volume traded on this question. Granular day-over-day or week-over-week price history is not part of the available figures here, so no specific move or trigger can be attributed with confidence; what can be said is that a level in this band reflects a market leaning toward continued restraint over the next few days without treating a strike as a remote possibility.

Analysis

Context

This question tracks whether the United States carries out a qualifying military strike on Iran before 28 October 2026, a short-horizon bet on the stability of the current US-Iran ceasefire. The ceasefire itself followed a period of direct US military action against Iran, and markets like this one have become a running gauge of how durable that arrangement is from week to week.
The consensus figure sitting in the mid-80s percent range, drawn from Polymarket with $519,127 in total volume traded, says the market leans toward the ceasefire surviving this particular four-day window, but it leaves real room for a strike. That is a meaningfully different reading than a market priced in the high 90s, which would signal traders see almost no chance of US military action before 28 October. A reading in this band instead reflects genuine uncertainty about Iranian behavior, Israeli-Iranian friction that could pull Washington in, and the possibility of a provocation that forces a US response within days rather than weeks. The resolution rules do a lot of work in setting that level. By excluding intercepted munitions, naval gunfire, artillery and small drones from counting as a qualifying strike, the question sets a relatively high bar for a No resolution โ€” it takes an actual US air strike or a surface-to-surface missile hitting Iranian territory, not a skirmish or an intercepted projectile. That narrows the paths to No and is one reason the price sits well above a coin flip rather than near it. At the same time, the short runway to settlement matters. With only days left before the 28 October cutoff, there is limited time for a slow-building crisis to de-escalate on its own, but also limited time for one to fully materialize into a US strike. Volume of $519,127 on a single venue, Polymarket, is moderate for a geopolitical contract of this kind โ€” enough to suggest active interest in the question but not so large that the price should be read as reflecting deep, broad-based conviction across many independent traders.

What moves the probability

  1. Definition of a qualifying strike

    The rules only count direct US air or surface-to-surface missile strikes on Iran, excluding interceptions, naval gunfire and small drone or ATGM use. This narrows the set of events that would trigger a No, which supports a higher Yes price than a broader strike definition would.

  2. Short time horizon

    The window runs only from now to 28 October 2026, a matter of days. A short deadline limits the number of escalation cycles that can play out, which can cut either way depending on whether tensions are currently rising or cooling.

  3. Iranian behavior toward US forces and partners

    Any attack by Iran or its regional proxies on US personnel, shipping, or allied forces would raise the odds of a US response before the deadline. This is the main channel through which the price could move toward No quickly.

  4. US political posture

    Statements or actions from the US administration signaling tolerance for continued restraint, versus signals of readiness to strike, directly shift how traders price the remaining days. This driver can move the price without any physical event occurring.

  5. Single-venue pricing

    With trading concentrated on one venue, Polymarket, at $519,127 in volume, the consensus reflects a narrower pool of participants than a multi-venue market would, which can make the price more sensitive to individual large positions.

The case for

  • No US air strike or surface-to-surface missile strike directly impacts Iranian territory before 11:59 PM Iran Standard Time on 28 October 2026.
  • Any incidents that do occur in this window fall into the excluded categories โ€” interceptions, naval gunfire, artillery, small drones or ATGMs โ€” rather than a qualifying strike.
  • Current diplomatic and military restraint from Washington continues through the remaining days without a triggering provocation from Iran or its proxies.

The case against

  • Iran or an aligned proxy force carries out an attack on US personnel, allies or shipping that provokes a US air or missile response before the deadline.
  • The US administration determines that a strike is necessary for deterrence reasons unconnected to a specific provocation, within the four-day window.
  • Escalation already in motion regionally, involving Israel or Gulf states, draws in a direct US strike on Iranian territory before 28 October 2026.

What to watch

The key date is 28 October 2026 at 11:59 PM Iran Standard Time, the deadline for a qualifying strike to trigger a No resolution, with the question itself set to resolve by 29 October 2026. Between now and then, watch for any reported Iranian attacks on US forces, allied shipping, or regional partners, any US statements signaling a shift in posture toward Iran, and any reported US air or missile activity near Iranian territory that could be classified as a qualifying strike under the rules.

Trade this contract

Venues (1)

Open on PolymarketYes 0.90
  • gas covered
  • no trading fee

More about this event

Venues (1)

Resolution rules

Determined by
Polymarket; based on verified reports of US military action against Iran
Resolution date

This question is determined by Polymarket using verified reports of US military action against Iran. It resolves No if the United States conducts a qualifying air strike or surface-to-surface missile strike โ€” including drones, cruise missiles or ballistic missiles โ€” that directly impacts Iran by 11:59 PM Iran Standard Time on 28 October 2026. Intercepted munitions, surface-to-air strikes, small-arms fire, ground incursions, cyber operations, naval gunfire, artillery, mortars, and minor strikes such as FPV drones or ATGMs do not count toward a No. If no qualifying strike occurs by that deadline, the question resolves Yes, with final resolution expected by 29 October 2026.

Calculation methodology โ†’

Local context

A US military strike on Iran would be a direct US foreign-policy decision with immediate effects on global oil markets, US equity futures, and the US dollar, all of which move through to borrowing costs, energy prices and investment portfolios for readers in the US, UK, Canada, Australia and India. Because the strike definition requires a direct US action rather than a regional skirmish, this market is effectively a gauge of Washington's own near-term military posture toward Iran, not of broader regional conflict risk.

Common questions

What exactly settles this question, and when?
It settles based on verified reports of whether the United States conducts a qualifying air or surface-to-surface missile strike directly impacting Iran by 11:59 PM Iran Standard Time on 28 October 2026. The question is expected to resolve by 29 October 2026.
What does the current market price mean?
The price reflects what traders collectively think the chance is that no qualifying US strike happens before the deadline. It is not a prediction from any single analyst or institution, just the current balance of buying and selling on Polymarket.
What happens if there's a strike but it's ambiguous whether it qualifies?
The rules are specific: only air strikes or surface-to-surface missile strikes, including drones, cruise or ballistic missiles, that directly impact Iran count. Intercepted munitions, naval gunfire, artillery, mortars, small-arms fire, ground incursions, cyber operations and minor strikes like FPV drones or ATGMs are explicitly excluded, which should reduce ambiguity in most scenarios.
Why does the strike definition matter so much here?
Because it excludes several categories of military activity that could otherwise look like an attack on Iran, the bar for a No resolution is narrower than it might first appear. This is a major reason the market does not price the ceasefire holding as a near-certainty but also not as a coin flip.
Can a position be exited before the 28 October deadline?
Yes, positions on Polymarket can generally be sold before settlement at whatever price the market is trading at the time, rather than holding until the resolution date.
Why is only one venue, Polymarket, listed for this market?
The available data shows trading concentrated on Polymarket with $519,127 in volume; no other venue's price for this specific question is included here.

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