Will the U.S. invade Iran before 2027?

Platform comparison

Market context

Polymarket prices this contract at **21% YES**, so the market is still assigning a meaningful but minority chance that the US will commence a military offensive intended to establish control over Iranian territory before the settlement deadline. On Polymarket, buyers lock in **USDC** on **Polygon**, and the outcome is settled via the platform’s **conditional tokens** framework, so traders are effectively pricing the likelihood of a very specific event: not just strikes, but a US move that amounts to attempting control over part of Iran by 31 December 2026.

That 21% sits against a backdrop of real military friction rather than a hypothetical crisis. In 2026, reporting and official statements describe a US-Iran conflict that has already involved US strikes, a ceasefire, and then renewed action focused on the Strait of Hormuz and nearby maritime routes.[3][5] Earlier reporting also said Washington had considered reinforcements, possible ground deployments to coastal areas, and even options involving Kharg Island and uranium stockpiles, although officials said no ground-troop decision had been made.[7] The 2026 National Defence Strategy continues to prioritise homeland defence, deterrence in the Indo-Pacific, allied burden-sharing, and industrial capacity, which is useful context for how constrained a larger Iran operation would be.[2]

For traders, the main catalysts are formal White House or Pentagon announcements, any shift from maritime/interdiction operations to land operations, and signs of congressional pushback. Reuters reported in March that the administration was weighing military reinforcements and possible troop deployments, while later reporting pointed to continued attacks and a naval blockade strategy aimed at forcing shipping access through the strait.[7][5] Because the market resolves only if the US begins a military offensive intended to establish control over Iranian territory, routine air or naval strikes alone may not be enough; the key watchpoint is any public indication of a ground component, occupation objective, or order that changes the stated mission from pressure to territorial control.[5][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.