Will the US officially declare war on Iran by 2026?

Platform comparison

Market context

The practical question is whether Congress will pass a formal declaration of war against Iran, not whether the United States is already using force. That distinction matters because the contract only resolves **Yes** if an act of Congress expressly declares war and becomes law; recent strikes, ceasefires, and other authorisations do not qualify. With the crowd-implied probability at **0%**, this market is pricing an extremely low chance of that narrow constitutional step, even though the underlying US-Iran conflict has remained active through 2026.[1][2]

Historically, the US has almost never used formal war declarations in the modern era, preferring authorisations, executive action, and military operations instead. In comparable Middle East crises, including the Iraq and Afghanistan episodes, Congress opted for authorisations rather than declarations, which is why prediction markets usually keep “formal declaration” contracts near the floor unless there is a clear legislative move. That pattern also helps explain why analyst-style commentary tends to separate “war” in the everyday sense from the much rarer legal act the market is testing.[1][2][11][12]

For traders, the main catalysts are political rather than battlefield-related: a White House request for congressional approval, a House or Senate resolution language shift from authorisation to declaration, or any reported bipartisan procedural agreement to bring such a measure to a vote. Reuters reported in February that military buildup and diplomacy were pulling in opposite directions, while later coverage described renewed strikes, a widened conflict, and continued efforts to manage escalation rather than formalise it through Congress.[3][5][6][11] That leaves a gap between headline-war risk and the market’s settlement rule, and it is that gap that keeps sportsbook-style event pricing, prediction-market odds, and analyst consensus likely to diverge sharply unless Congress itself changes course.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.