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Will the US-Iran ceasefire hold through 15 October 2026?

Resolution: Updated:

In short

The market treats a continued ceasefire as the likely outcome for the next few days. That reading rests mainly on how narrowly the contract defines a qualifying US strike, which excludes most of the lower-level friction that has characterized the region. A reported air strike or surface-to-surface missile strike hitting Iranian territory before the deadline would flip this quickly.

Editorial illustration for: Will the US-Iran ceasefire hold through 15 October 2026?

How the contract works

A contract on this question settles at $1 if the ceasefire holds through the deadline and at $0 if the United States conducts a qualifying military action against Iran first. The rules are specific about what counts: an air strike or a surface-to-surface missile strike that directly impacts Iranian territory. Intercepted munitions, naval gunfire, cyber operations, ground incursions, small arms fire, and statements of intent or formal authorizations to strike do not trigger a No, however alarming they might look in the news. The window closes at 11:59 PM Iran Standard Time on 15 October 2026, and the market itself resolves on 16 October 2026 based on Polymarket's own determination and contemporaneous news reporting. A position in this contract can be sold at the prevailing price at any point before that settlement, rather than being held to the end.
What the market thinks happens
$100
Yes91%

The event happens

Costs now
$0.91
If you put in $100
$110
No9%

The event does not happen

Costs now
$0.09
If you put in $100
$1,111

Probability

History starts collecting once the event is tracked

How the price has moved

The available data is a single snapshot rather than a documented trend: Polymarket prices the contract at 90% with $781,653 in volume, and no cross-venue spread exists because it is the only platform currently listing this question. That level is consistent with a market that sees the narrowly defined trigger for No, a direct US strike, as the less likely path over the remaining days, while still pricing in a meaningful chance that it happens given the volatility of the underlying relationship.

Analysis

Context

This contract tracks whether the ceasefire currently in place between the United States and Iran survives through 15 October 2026. The question sits inside a broader, long-running confrontation between Washington and Tehran over Iran's nuclear program, missile development, and its network of regional proxies, a confrontation that has produced strikes, retaliations, and pauses before. A ceasefire is, by definition, fragile until enough time passes without a violation that both sides stop treating it as provisional.
Polymarket currently prices this contract at 90%, the only venue tracking it, with $781,653 in trading volume to date. With a single venue there is no spread to read across platforms, so the only signal available is how much capital has accumulated behind that one number. A volume in the high hundreds of thousands of dollars on a five-day geopolitical window suggests real but not extreme interest, the kind of sizing consistent with traders treating this as a live but not coin-flip question. The structure of the resolution rules does a lot of the work here. By excluding naval gunfire, cyber operations, ground incursions, small arms exchanges, and even formal strike authorizations, the contract sets a high bar for a No outcome. Much of what might dominate headlines in a tense week between the US and Iran, a drone shot down, a cyber intrusion disclosed, a carrier group repositioned, simply does not count toward resolution. Only a reported air strike or surface-to-surface missile strike that directly hits Iranian territory moves this to No. That narrow definition is itself a reason for the price to sit where it does. The short time horizon cuts the other way but only modestly. Five days is not long enough for most diplomatic processes to unfold, but it is long enough for a single decision in Washington or a single provocation inside Iran to change the picture entirely. Ceasefires between these two countries have broken before under pressure from proxy attacks on US personnel or perceived violations by the other side, and nothing in the resolution rules insulates this one from that kind of trigger. The market's current level reflects a judgment that the specific, narrow event required for a No, a direct US strike, is not the most likely path over the remaining window, not a judgment that the underlying relationship is stable.

What moves the probability

  1. Narrow strike definition

    Only an air strike or a surface-to-surface missile strike directly hitting Iran counts as a qualifying action. This excludes naval gunfire, cyber operations, ground incursions, and small arms fire, which raises the bar for a No outcome and pushes the price toward Yes.

  2. Five-day window

    The deadline falls at 11:59 PM Iran Standard Time on 15 October 2026, leaving a short runway. A short window limits the number of discrete decision points at which the US could authorize and execute a qualifying strike.

  3. Proxy and third-party escalation

    Attacks on US forces or allied assets by Iran-aligned groups elsewhere in the region could provoke a US response that meets the strike definition. This is the most plausible route to a sudden shift in the price, since it does not require a direct US-Iran confrontation to start.

  4. Rhetoric versus action

    Statements of intent or formal authorizations to strike do not themselves trigger a No under these rules. The market can therefore stay elevated even through periods of hostile public language, since only an actual strike changes the outcome.

The case for

  • No qualifying air strike or surface-to-surface missile strike hits Iranian territory before 11:59 PM Iran Standard Time on 15 October 2026.
  • Both Washington and Tehran continue to treat the existing ceasefire as the baseline rather than escalate to direct strikes within the window.
  • Any friction that does occur, naval incidents, cyber activity, proxy skirmishes, stays below the threshold the resolution rules define as a qualifying action.
  • News reporting through 16 October 2026 confirms no such strike occurred, allowing the contract to resolve Yes.

The case against

  • The United States conducts an air strike or surface-to-surface missile strike directly impacting Iran before the deadline, which resolves the contract No regardless of the reason given.
  • A proxy attack on US forces or allies triggers a US military response that meets the strike definition.
  • Escalation around Iran's nuclear program or missile activity prompts a US decision to strike within the five-day window.
  • Events move quickly enough that the short time remaining is sufficient for a single decision to reverse the current reading.

What to watch

The hard deadline is 11:59 PM Iran Standard Time on 15 October 2026, after which the contract resolves based on Polymarket's determination and news reporting, with settlement recorded on 16 October 2026. Between now and then, the things that matter are reports of any US air or missile strike hitting Iranian territory, any proxy attack on US forces or allies that could provoke such a strike, and any formal US military authorization that moves from rhetoric toward action. Naval incidents, cyber disclosures, or ground-level skirmishes may generate headlines without affecting this particular contract, since they fall outside the qualifying definition.

Trade this contract

Venues (1)

Open on PolymarketYes 0.91
  • gas covered
  • no trading fee

More about this event

Venues (1)

Resolution rules

Determined by
Polymarket / news reports of US military action against Iran
Resolution date

The contract resolves No if the United States carries out an air strike or a surface-to-surface missile strike that directly impacts Iranian territory at any point up to 11:59 PM Iran Standard Time on 15 October 2026. Intercepted munitions, naval gunfire, cyber operations, ground incursions, small arms fire, and statements of threat or formal strike authorization do not count toward a No outcome. If no such strike occurs by that deadline, the contract resolves Yes. The determination is made by Polymarket using contemporaneous news reporting, with resolution recorded on 16 October 2026.

Calculation methodology โ†’

Local context

A US strike on Iran is a direct US foreign policy event with knock-on effects for American readers and their allies: it would touch oil markets, shipping through the Strait of Hormuz, and the posture of US forces already deployed across the Gulf region. For UK, Canadian, and Australian readers whose governments coordinate closely with Washington on Middle East policy, and for Indian readers whose energy imports and expatriate communities in the Gulf are exposed to regional instability, a break in the ceasefire would register quickly in energy prices and diplomatic signaling well beyond US borders.

Common questions

What exactly settles this contract, and when?
It resolves No if the United States conducts a qualifying military action against Iran, an air strike or surface-to-surface missile strike directly hitting Iranian territory, by 11:59 PM Iran Standard Time on 15 October 2026. Otherwise it resolves Yes, with the determination made on Polymarket using news reports and recorded on 16 October 2026.
What does the current price actually mean?
The price is the market's current estimate of the probability that the ceasefire holds through the deadline, not a guarantee of either outcome. A contract trading near 0.90, for example, would mean the market sees roughly nine chances in ten that no qualifying strike occurs in the window.
What counts as a strike for resolution purposes, and what does not?
Only an air strike or a surface-to-surface missile strike that directly impacts Iran counts toward a No outcome. Intercepted munitions, naval gunfire, cyber operations, ground incursions, small arms fire, and mere threats or formal authorizations to strike are explicitly excluded.
What happens if a strike occurs but reporting is unclear or disputed?
Resolution depends on Polymarket's review of news reports, so a genuinely ambiguous event, disputed attribution or unconfirmed reports, could delay a clean determination past the 16 October 2026 settlement date. The rules do not specify an automatic fallback for that scenario.
Why is there only one venue listed for this question?
Polymarket is currently the only platform tracking this specific contract, which is why there is no cross-venue price spread to compare. Volume of $781,653 reflects trading on that single platform.
Why might the US strike Iran before the deadline even with a ceasefire in place?
Ceasefires between the US and Iran have historically come under pressure from proxy attacks on US personnel, disputes over compliance, or new intelligence about Iran's nuclear or missile programs. Any of those could prompt a US decision to strike, which is the single event this contract is built around.

Related events

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Open on Polymarket