Pronóstico: U.S. agrees to give Ukraine security guarantee by June 30?

Platform comparison

Market context

The United States has not formally committed to a NATO Article 5–style security guarantee for Ukraine by June 30, 2026, leaving the current Polymarket contract priced at 0% for "Yes". On-chain, this conditional token sits on Polygon, redeemable for USDC if the Trump administration and Kyiv sign a binding mutual defence pact that triggers automatic intervention upon Russian aggression. The market’s zero probability reflects the absence of any such publicly announced, mutually agreed deal meeting the strict resolution criteria.

Historically, US security pledges to Ukraine have remained vague and conditional, lacking the automatic enforcement of NATO membership. A recent CSIS analysis notes the Trump administration’s proposed 15-year guarantee is even more ambiguous, requiring Ukraine to pay for the guarantee and forfeiting it if Kyiv invades Russia or launches missiles at Moscow[4]. Brookings Institution experts argue credible guarantees from Trump are not on the table, as past pledges lack the paper-to-action credibility needed for genuine deterrence[5]. This precedent explains why traders assign no weight to a formal Article 5–equivalent commitment emerging by the settlement deadline.

Traders should monitor upcoming announcements from the Trump administration regarding the condensed 20-point peace framework, which includes security guarantees but remains conditional on Kyiv ceding Donbas[2]. Key catalysts include Zelenskyy’s next public statements on the 30-day ceasefire proposal and any scheduled talks involving NATO Secretary General Rutte[3]. The US has recently lifted embargoes on arms shipments to Ukraine, yet no binding mutual defence language has been confirmed[3]. Without a formal, mutually signed treaty explicitly mandating US intervention, the market will resolve to "No".

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: U.S. agrees to give Ukraine security guarantee by June 30? 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

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.

Do I need to KYC for this market?

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

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.