Will the US confirm that aliens exist by 2027?

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Active sub-markets

Market context

The underlying event is whether any senior US official—President, Cabinet member, Joint Chief, or federal agency head—will definitively state that extraterrestrial life or technology exists before the end of 2026. Current crowd-implied probability sits at 10% for a “Yes” resolution, reflecting cautious scepticism despite recent government disclosures.

Historically, official confirmation of extraterrestrial life has never occurred. The May 2026 release of US UFO files under President Trump’s PURSUE programme did not confirm alien existence; the Pentagon described the materials as “unresolved cases” with no definitive determination, and Trump himself urged the public to “draw their own conclusions”[2]. Similarly, a 2023 congressional hearing featured claims of recovered non-human biologics, but the Department of Defence stated there was “no verifiable information” to substantiate such assertions[3]. These precedents frame the current 10% probability as a realistic baseline rather than an outlier.

Traders should monitor the newly formed multidisciplinary science advisory council tasked with guiding UAP investigations, which may accelerate analysis of unexplained sightings[1]. Key catalysts include scheduled releases of further declassified documents—Pentagon spokesperson Sean Parnell confirmed more files are “actively being processed” and will arrive “very soon”[2]. The settlement window closes on 31 December 2026, making the timing of these announcements critical. Kalshi’s market KXALIENS tracks similar odds, though its definition of “Cabinet” includes additional agency heads, creating a slight divergence in resolution criteria compared to this contract[5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Will the US confirm that aliens exist by 2027? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

Where can I trade this market with the lowest fees?

On PolyGram, 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?

PolyGram 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 PolyGram?

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

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.