Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Alternative) Pick polygram.ink (preferred broker) |
89% | 11% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open the market → |
Polymarket (direct) polymarket.com |
89% | 11% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open the market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open the market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open the market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open the market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| July 31 | 89% |
| July 15 | 84% |
| June 15 | 0% |
| June 22 | 0% |
| June 30 | 0% |
| July 7 | 0% |
Market context
The Trump administration has already declassified multiple batches of files on Unidentified Anomalous Phenomena, including never-before-seen videos, pilot accounts, and transcripts from the Apollo 17 mission, with the first tranche released on 8 May 2026 and subsequent batches on 22 May and 12 June 2026 [1][2][4]. This rolling disclosure process, mandated by President Trump in February 2026, means the core event of declassifying new UFO files pertaining to extraterrestrial life or unexplained aerial phenomena has already occurred, rendering the market’s 0% YES probability a reflection of settled fact rather than uncertainty [2][5].
Historically, such transparency campaigns mirror the Pentagon’s 2020 disclosure of UFO videos, which sparked congressional attention but did not immediately yield full declassification; here, however, the PURSUE system has already delivered over 300 files dating to the 1940s, with officials describing the releases as the start of a continuous process [2][8]. For traders comparing platforms, Polymarket’s decimal odds format would show this market as effectively closed, whereas Kalshi’s implied probability model might still list a nominal 0% despite the event’s completion, and Betfair’s fee structure could obscure the clarity of this resolution compared to Smarkets’ lower-cost alternative [1][2].
Traders should monitor the Department of War’s WAR.GOV/UFO portal for further tranche announcements, as the third batch was released on 12 June 2026 and additional files are expected on a rolling basis [4][5]. Recent Fox News reporting confirms the administration’s “world exclusive” release of alien life files, including Apollo mission photos and Department of War videos, underscoring that no new declassification is required to satisfy the market’s conditions [1]. With the settlement window ending 30 June 2026, the market’s outcome is predetermined by events already in the public domain.
Methodology
We read Trump declassifies new UFO files by 2026? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.
Resolution & payout
Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.
Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.
FAQ
- Polymarket vs Kalshi — which is better?
- Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.
- What does Polymarket cost vs Kalshi?
- Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.
- Which platform has the deepest liquidity?
- Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.
- Which platform is accessible globally?
- Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.
- Are all these platforms regulated?
- No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.
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