Will the US invade Iran odds are not a forecast of the next air raid. They are the price of the Will the U.S. invade Iran before 2027 contract, and that contract pays only if the United States commences a military offensive intended to establish control over any portion of Iran by 11:59 p.m. Eastern Time on 31 December 2026. Strikes, a sunk boat, and the blockade already being run do not settle it. Gamma-api, pulled at 06:42 UTC on 8 October 2026, showed yes at 0.155 and no at 0.845. The best bid was 0.15, the best ask 0.16, and the last trade 0.16. That is 15.5 cents for a control test with just under 85 days left. The end stamp on the same pull was 04:59 UTC on 1 January 2027, the Eastern deadline written in UTC. The book was open and still taking orders. A resolved leg would sit at 0 or at 100. This one does not.
The same morning cuts against anyone treating 15.5% as the odds the war simply continues. Brent crude futures, the BZ=F contract on the Yahoo Finance chart endpoint, were at $103.17 at 06:39 UTC, a war-economy oil print. The refined-product question is a different argument, set out in the heating-oil forecast. On this contract, Polymarket's own fields had the yes price up 0.02 over one week and 0.01 over one month. Across those weeks, Gulf News, citing Axios, reported that President Donald Trump had not decided to resume major combat, that no strike date was set, and that a renewed campaign was expected to hit energy, infrastructure and nuclear targets. The token got richer. The option being described still fails the test this market uses.
Key facts
- Yes 15.5%, no 84.5%, bid 15 cents, ask 16 cents, last trade 16 cents. Polymarket gamma-api, market updated 06:42 UTC on 8 October 2026.
- Lifetime volume $72.62 million, 24-hour volume $284,199, one-week volume $2.31 million, liquidity $973,614, open interest $7.29 million. Same gamma-api print.
- Yes price up 2 percentage points on the week and 1 point on the month, from gamma fields oneWeekPriceChange 0.02 and oneMonthPriceChange 0.01. 8 October 2026.
- Yes requires a US military offensive intended to establish control over any portion of Iran by 31 December 2026, 11:59 p.m. ET. Market description, read 8 October 2026. The 4 November 2025 noon ET map is the baseline for what counts as each side's territory.
- About 50,000 US troops were executing a blockade of Iranian ports, with ships allowed through only on humanitarian grounds, Adm. Brad Cooper said in an update The Jerusalem Post reported on 28 August 2026. That headcount is not an 8 October figure.
- Roughly 9,000 more sailors and Marines were being sent toward the region, with three carriers possible by late October or November, Gulf News reported on 2 October 2026, citing US officials.
- Trump had not made a final decision to resume major combat, and no date was attached to the preparation order. Gulf News, citing Axios, 8 October 2026.
What will the US invade Iran odds actually pay on
Four gates sit inside one sentence on the market page. The actor has to be the United States. The act has to be a military offensive, not a threat, a sanctions list, or a plan that stays in a briefing book. The purpose has to include control of some portion of Iran. And it has to commence by the deadline. Miss one gate and the contract resolves no, however violent the week looks on television.
The full wording is on Will the U.S. invade Iran before 2027. Links to Polymarket are affiliate links, from which The Traders Spread may earn a commission at no cost to you. Resolution, the page says, is a consensus of credible sources. There is no single wire-service checkbox and no requirement that Congress use the word invasion. A limited attempt to seize and hold an island, a port or a coastal strip can qualify. A months-long air campaign that never tries to hold ground cannot.
Land each country de facto controlled at noon Eastern on 4 November 2025 counts as that country's territory for this test. Anything either side has taken since then is judged against that frozen map. This desk has not re-surveyed the ground, and it does not adjust the fair value for a land change it cannot document. What the price itself shows is narrower. The contract is still open, with yes at 15.5% rather than pinned at a resolved 0 or 100. The war fought so far has not been treated, by the crowd or by the resolver, as a completed yes.
That is also why a ceasefire book running only through 31 October is not this article. It asks a different question and is covered on its own. A blockade contract would be a third object. Sea control can be tight and still leave this yes token unpaid.
The token rose while the order stayed unsigned
From the 8 October pull, lifetime volume was $72,622,291. The latest day did $284,199 and the latest week $2,307,125. Market liquidity was $973,614, against $975,207 on the wrapped event. Open interest was $7,293,675. The spread was one cent, which is also the minimum tick. All of that is gamma-api on market 665374 at 06:42 UTC, not a search snippet.
A one-cent book with nearly a million dollars of displayed liquidity is not a ghost quote. The mid used here is outcomePrices, 15.5%, between the 15-cent bid and the 16-cent ask. Last trade was 16%. Fair value, 10%, sits under all three.
| Level | Source | |
|---|---|---|
| Yes mid | 15.5% | gamma-api outcomePrices, 8 Oct 2026, 06:42 UTC |
| Best bid | 15% | same pull, bestBid 0.15 |
| Best ask | 16% | same pull, bestAsk 0.16 |
| Last trade | 16% | same pull, lastTradePrice 0.16 |
| No mid | 84.5% | same pull, outcomePrices |
| Our fair value on yes | 10% | this desk, 8 Oct 2026 |
| Limited holding action | 6.5% of fair | desk weight inside the 10% |
| Broader ground offensive | 1.5% of fair | desk weight inside the 10% |
| Disputed case that still resolves yes | 2.0% of fair | desk weight inside the 10% |
Plus two cents in a week and one cent in a month is a grind, not a panic, and it happened while the 8 October account was still "no final decision." A book can pay up for a tail before anyone signs the order that tail needs. The live page, separate from this gamma snapshot, is the invade-Iran contract. "Odds rose" is true of the token. It is not proof a holding operation got more likely by the same amount.
A blockade force is not a holding force
Adm. Brad Cooper, commander of US Central Command, described the posture in an update The Jerusalem Post carried on 28 August 2026. Around 50,000 US troops were running a blockade that had stopped Iranian oil shipments since mid-July. Nearly 1,500 vessels carrying roughly 750 million barrels had transited Hormuz under US protection in the period he described, with more than 20 warships and hundreds of aircraft involved. His line on the ports was specific.
No ships have entered or left an Iranian port without our permission, and we have only allowed ships to pass through on humanitarian grounds.
That is a blockade and a cleared waterway. It is not US troops holding an Iranian city, island or port. The contract pays on the second fact. Adding his 50,000 to October's reinforcement and calling the sum an invasion army is arithmetic this desk will not publish. The August headcount is six weeks old. The October number is ships moving, not a new census.
Gulf News, on 2 October, citing US officials, reported roughly 9,000 sailors and Marines heading for the region, including a third carrier, possibly on station by late October or November. A Marine expeditionary unit can seize a beach or a terminal. Arrival is not the order. If the extra deck shows up late in November, only weeks remain. Commencing is enough. The offensive need not be finished by New Year. It does have to start, and the intent has to be control.
President Donald Trump, at Sparrows Point, Maryland, on 6 October, sounded as if the campaign was in its last chapter. Gulf News published the remarks on 8 October.
We're doing extremely well in the Islamic Republic of Iran, very well. They have no military. It's shot; the whole place is shot.
He framed the rest as "the nice way or the not-so-nice way." A president who says the other military is already finished is talking about how to close a campaign, not about holding ground. The close Gulf News described, citing Axios, was more strikes. Defense Secretary Pete Hegseth told troops at Quantico that US forces had "destroyed" Iran's navy, air force and nuclear ambitions, Gulf News reported on 1 October 2026. That is a strike-campaign line. Preparation is not commencement.
Secretary of State Marco Rubio, after the Camp David session in that 8 October account, said the focus was "long-term" foreign policy planning. An unnamed Israeli official told Axios that resumed major combat before the 3 November midterms was not likely, though not ruled out, and more likely after the vote. Unnamed officials do not get quotation marks here. The calendar point still stands. The hawkish leak puts the heavier risk after 3 November, inside a short box, and still describes strikes.
A ground brief reached the president, and stopped
The clearest sign that a ground option was real, and was refused, is older than this week's token. On 12 June 2026, Natasha Bertrand and Zachary Cohen of CNN reported that Gen. Dan Caine, chairman of the Joint Chiefs, flew to CENTCOM in Tampa on 19 May for plans to send troops into Iran and seize highly enriched uranium. He briefed Trump. Trump paused it after warnings of retaliation, a longer war and significant US casualties. KTVZ carried the CNN piece the same day.
Trump's line to Fox News, in that story, was about taking control of Kharg Island. The correspondents tied that option to high casualties.
I don't know if America has the stomach for it.
The same Thursday, from the Oval Office: "Nobody's getting close to it because it's buried under a mountain." An unnamed source told CNN a seizure would take a massive presence and would, in that source's words, amount to an invasion. The witness we can name is the president, and he stepped back.
Four months on, the option is not proven dead. Paused options get briefed again. October's new fact is the missing order. No CENTCOM statement cited here tells a unit to seize and hold Iranian ground. The 8 October preparation order is for strikes. Trump's October language is about finishing, not occupying. Ignore the June pause and the tail is too cheap. Treat a holding operation as the default next step and you are just restating the 15.5% token.
Kharg is the case people smuggle in under "invasion." A landing meant to hold the export terminal can be yes even if nobody marches on Tehran. A raid that wrecks the terminal and leaves is a strike. Strikes are what this wording does not pay. Intent, agreed by a consensus of credible sources, is the difference, not the size of the blast.
Where 10% sits against a 15.5% token
Base fair value is 10%, a judgment rather than a fitted model. About 6.5 points sit on a limited holding action that credible sources would call control. The tools are the late-August blockade force and the October reinforcement. The brakes are the June pause, the Kharg line, and an unsigned strike order. About 1.5 points sit on holding a city or a province, unmentioned in public. About 2 points sit on a messy raid that a consensus still scores as control. A dispute can fail to pay.
RelatedUS-Iran Ceasefire Priced at 71.5% Through 31 October
The yes mid at 15.5% is 5.5 points above that 10%, against a one-cent spread, so the traded price sits above fair value. Where price and fair value match, the mark is in line, which is how the October Fed decision was treated against futures. This gap is not that. The mark is above fair. It is a view on the price, not an instruction to take either side.
The bull case is 18%, and only if a dated order tells a unit to seize and hold a named place, or if reporting says that offensive has started. Eighteen is not a majority. That order has not landed. If it did, 15.5% would be the cheap print and the mark would flip.
The bear case is 4%, if the White House or CENTCOM rules out a ground holding operation through 31 December, or if a deal takes Kharg and a uranium seizure off the table. Qatari mediators were still waiting on Iran's answer, Gulf News reported on 8 October, citing Axios. Stalled talks are not a freeze.
A start that sources call control moves fair value toward 18% and can cross the market. A public shelf on ground options moves it toward 4%. Another strike package was already the reason not to pay 15.5 cents. A yes token near 10 cents would be in line. One through 10 cents by more than the spread would sit below fair. Those weights follow the sources above. They are not a sample of past wars. The wording is on the same Polymarket event.
Questions around will the US invade Iran odds
What are the will the US invade Iran odds right now?
On the gamma-api print at 06:42 UTC on 8 October 2026, yes was 15.5% and no was 84.5%. The book was 15 cents bid and 16 cents offered, and the last trade was 16 cents. Those prices are for a territorial-control test through 31 December 2026. They are not a forecast that the wider war ends, and they are not the odds of another round of strikes on their own.
Do US airstrikes on Iran settle this contract yes?
No. The market description requires a military offensive intended to establish control over some portion of Iran. Bombing energy sites, nuclear facilities or ships fails that test unless a consensus of credible sources agrees the purpose was to hold ground. The wording used here was read from the market page on 8 October 2026, and the contract was still open.
Does the Hormuz blockade count as the invasion?
Not by itself. Adm. Brad Cooper described about 50,000 US troops enforcing a port blockade in an update The Jerusalem Post reported on 28 August 2026. By 8 October the contract was still open and yes was 15.5%, not a resolved 100. Sea control and a blockade are a different predicate from holding Iranian territory, which is what the rules demand.
When does the invade-Iran market resolve?
The deadline in the rules is 11:59 p.m. Eastern Time on 31 December 2026. Gamma-api lists the end at 04:59 UTC on 1 January 2027, which is that same moment. If no qualifying offensive has commenced by then, the market resolves no. The resolution source is a consensus of credible sources, not a single government press release.
Why is fair value 10% when the token is 15.5%?
The gap is the difference between a war and a holding operation. This desk puts 6.5% on a limited seizure that sources would call control, 1.5% on a broader ground offensive, and 2% on a disputed action that still draws a yes consensus. Added up, that is 10%. The extra 5.5 points look like war risk that this wording does not pay. The one-cent spread does not close a gap that wide.
What would make the fair value move?
A presidential order to seize and hold a named place, or reporting that such an offensive had started, would lift fair value toward 18%. A public decision ruling out ground holding operations through the deadline would cut it toward 4%. A loud raid described as a strike with an exit would not, on these rules, be enough to call the contract yes or to rewrite the 10%.
This is analysis, not a recommendation. It is not an instruction to take either side of any contract. Prediction-market positions can expire worthless. Capital is at risk. The operator writes the rules, and those rules can be narrower than a headline. Every figure above is tied to the source and the timestamp next to it, and the token will move after this is filed.