Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Best Prediction Markets UK) Pick polygram.ink (preferred broker) |
89% | 11% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | View on Polymarket → |
Polymarket (direct) polymarket.com |
89% | 11% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | View on Polymarket → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | View on Polymarket → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | View on Polymarket → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | View on Polymarket → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| July 31 | 89% |
| July 15 | 87% |
| June 15 | 0% |
| June 22 | 0% |
| June 30 | 0% |
| July 7 | 0% |
Market context
The Trump administration has already begun declassifying files on Unidentified Anomalous Phenomena, releasing three tranches under the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE), with the latest batch of 72 documents issued on 12 June 2026. These files, dating from the 1940s, include vivid descriptions of spinning discs and glowing orbs but contain no conclusive evidence of extraterrestrial life or government cover-ups, according to NBC News and CBS News reports [2][4].
Historically, similar transparency drives—such as the 2017 New York Times UFO disclosure and the 2020 Pentagon AARO reports—initially generated high market speculation before resolving to “no proof” outcomes, framing the current 0% implied probability as a rational assessment of the event’s likelihood rather than a dismissal of the phenomenon itself. The PURSUE initiative, mandated by President Trump’s executive order earlier this year, has already released approximately 300 files, with further releases expected on a rolling basis via WAR.GOV/UFO [1][2].
Traders should monitor upcoming PURSUE tranche announcements, scheduled interagency reviews by the All-domain Anomaly Resolution Office (AARO), and any new statements from NASA Administrator Jared Isaacman regarding unexplained imagery. While NASA has confirmed possession of unexplained UFO footage, Isaacman noted in June that no evidence of crashed alien bodies or recovered spacecraft has been found, reinforcing the absence of definitive extraterrestrial proof [5]. The settlement window ends 30 June 2026, with no further blockbuster revelations anticipated based on current disclosures [8].
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 Best Prediction Markets 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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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 Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.
Trade Trump declassifies new UFO files by 2026? on Best Prediction Markets UK
Live order book, 0% fees, USDC settlement in seconds.
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