Will the US officially declare war on Iran by 2026?

Platform comparison

Market context

The real-world event is a **formal declaration of war on Iran by Congress**, not airstrikes, naval operations, or a broad authorisation. That distinction matters because the market only resolves Yes if Congress passes a declaration of war that is enacted into law; executive action, AUMFs, and military operations do not qualify.

Historically, the bar for a declaration of war is extremely high: the US has not formally declared war on another state since 1942, even during large-scale conflicts in Korea, Vietnam, Iraq, and Afghanistan. In this case, the crowd’s 0% implied probability is consistent with the fact that the US has already been conducting military operations against Iran in 2026 without triggering the constitutional mechanism this market requires. Recent reporting describes renewed strikes, widening retaliation, and a live conflict dynamic, but that is still procedurally far short of a congressional declaration.[7][10][11]

For a programmatic trader, the key variables are not battlefield headlines but legislative signals: bill introductions, committee scheduling, floor calendars, whip counts, and whether the White House explicitly asks Congress for a declaration rather than seeking more flexible authorities. Watch for any joint resolution language, Senate or House action on war powers, or an emergency session tied to Iran escalation; Reuters reported in February that military buildup was outpacing diplomacy, and later July coverage showed the conflict continuing to intensify, which can raise procedural pressure without changing the legal requirement.[3][6][7]

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 Polymarket Bot UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Bot UK. 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 Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.