6% — Will any country leave NATO by...
Polymarket 6% · 1 contracts · $26 volume · low confidence
Updated 2026-06-08 07:51:11 UTC

Why this matters:
This probability estimates the chance that at least one NATO member country will withdraw from the alliance by a specified date. The 13% aggregate reflects significant uncertainty, with notable disagreement between venues: Kalshi prices in substantially higher withdrawal risk (24%) compared to Polymarket (9%). The gap likely reflects differing assessments of US political developments, particularly around potential policy shifts toward NATO commitments. Factors pushing probability upward include geopolitical tensions, domestic political changes in member states, and shifts in alliance burden-sharing debates. Factors pushing downward include institutional inertia, economic interdependence, and the high costs of NATO exit. The most immediate driver is US election and policy outcomes, given that a US withdrawal would constitute the likeliest scenario priced into these contracts.

Key factors:
- US domestic political positions on NATO funding and alliance commitments will directly shape withdrawal likelihood given America's outsized role
- Kalshi-Polymarket divergence (15 percentage points) suggests traders weight geopolitical risks and political change probabilities differently across platforms
- Polymarket contracts show lowest probabilities on near-term US withdrawal (3-12¢ for mid-2026), indicating markets view full exit as unlikely within 18 months
- Historical NATO membership has shown high persistence despite periodic political friction and burden-sharing disputes
- Specific triggering events (major military conflict, allied security guarantee withdrawal, formal treaty revision) rather than gradual drift would most likely precipitate withdrawal

Contracts:
- Will any country leave NATO by...?: December 31, 2026 — 6¢ Polymarket $26 (weight 100%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-08T07:20:11.808Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "6% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/any-country-leave-nato
Full data: https://simplefunctions.dev/api/public/query?q=Will%20any%20country%20leave%20NATO%20by...
Provider: SimpleFunctions — https://simplefunctions.dev