Will US withdraw from NATO by 2027?

Platform comparison

Active sub-markets

Market context

The United States could formally notify NATO of its intention to withdraw under Article 13 of the North Atlantic Treaty at any point through the end of 2026. Such notification would trigger a one-year withdrawal process, though the market resolves to "Yes" upon notice alone, regardless of whether subsequent legal or political action delays or reverses the decision. The current 3% implied probability reflects the low baseline expectation of such a dramatic institutional rupture within the next two years.

Historical precedent offers limited guidance. No NATO member has ever submitted a denunciation notice, and the only comparable case—the Soviet Union's withdrawal from the Warsaw Pact framework in 1991—occurred under vastly different geopolitical circumstances. The U.S. has threatened NATO withdrawal rhetorically on multiple occasions since 2016, but these remained negotiating positions rather than formal steps. Traders should note that rhetorical escalation, whilst newsworthy, does not satisfy the market's settlement criteria; only official written notice to NATO qualifies.

Key catalysts centre on U.S. domestic political transitions and NATO burden-sharing disputes. The 2024 presidential election outcome will substantially influence the probability trajectory through 2026. Watch for statements from senior administration officials regarding Article 5 commitments, defence spending demands on allies, and bilateral NATO relations. Recent reporting from Reuters and the Financial Times has tracked ongoing tensions over European military expenditure targets, but these remain within the framework of alliance reform rather than withdrawal discussions. Traders building conditional orders should monitor quarterly NATO summits and U.S. State Department announcements as decision points.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

On Polymarket App UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket App UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 it cost to trade on Polymarket App UK?

Zero. Polymarket App UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket App UK triggers a quick verification flow that finishes in minutes.