Will the U.S. invade Iran before 2027?

Platform comparison

Market context

The real-world event is whether the United States starts a military offensive aimed at taking control of any part of Iran before the end of 2026, not merely striking Iranian targets from offshore or the air. Because the contract only resolves “Yes” if U.S. forces commence an offensive intended to establish control, traders need to separate limited raids, blockade enforcement, and stand-off strikes from a genuine ground-control campaign when they code signals and set conditional orders.

The current 27% price makes more sense against the backdrop of the 2026 Iran war and the larger U.S. build-up in the region. Reuters reported in March that Washington was weighing reinforcements and even possible ground deployment to the Iranian coast and Kharg Island, which is the sort of escalation that keeps tail risk alive in a market like this.[11] Earlier reporting also described the Pentagon preparing for weeks of restricted ground activity, but explicitly said those plans did not amount to a full-scale invasion, which matters because prediction markets often reprice on ambiguous “boots on the ground” headlines that still fall short of territorial control.[9]

For trading, the main catalysts are formal White House and Pentagon briefings, troop-movement reports, and any shift from maritime or air operations towards sustained land operations near the Strait of Hormuz or Iranian coastline. A programmatic setup would typically watch for keyword combinations in reliable news feeds — “ground forces”, “capture”, “occupy”, “control”, “invasion” — and then cross-check them against force-posture changes, congressional authorisations, or ceasefire breakdowns before acting. Military Times reported in June that the U.S. would keep its Middle East posture in place despite the Iran agreement, so a durable drawdown is not the base case; any renewed mobilisation or public mention of securing territory would be the sharper trigger for a move in the contract.[5]

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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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.