Will the U.S. invade Iran before 2027?

Platform comparison

Market context

The United States has not yet commenced a military offensive intended to establish control over any portion of Iran, despite a significant buildup of carrier presence and air assets in the region. Current crowd-implied probability sits at 12% for a "Yes" resolution before the end of 2026, a figure that diverges notably from analyst consensus which views a limited, high-precision strike as plausible but a sustained campaign for territorial control as far less likely unless a sharp trigger occurs. Sportsbook lines on similar geopolitical conflicts often price in higher volatility than prediction markets, yet here the market remains anchored to the specific definition of "establishing control," which raises the threshold significantly above the moderate-to-high risk of limited kinetic action reported in recent weeks.

Historical precedents like the 2026 Iran war, codenamed Operation Epic Fury, demonstrate that while nearly 900 strikes can devastate infrastructure and leadership, they do not automatically equate to the occupation or control of sovereign territory. The 2026 conflict concluded in May without the US establishing de facto control over Iranian land, reinforcing the view that air campaigns alone rarely achieve the market's specific resolution criteria. Traders should monitor explicit presidential signaling, such as warnings about an "armada" moving toward Iran, alongside visible shifts in military posture like multi-day aerial exercises. Recent reports from CNN indicate US forces could be positioned for an offensive by the weekend if negotiations fail, while Iran has simultaneously reinforced nuclear sites and closed sections of the Strait of Hormuz, creating a volatile dependency on whether diplomatic off-ramps remain viable before the settlement window closes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Will the U.S. invade Iran before 2027? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Kalshi vs Polymarket. 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.

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 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.