Will the US confirm that aliens exist by 2027?

Platform comparison

Market context

The United States government has yet to issue any definitive statement confirming the existence of extraterrestrial life or technology, leaving the current crowd-implied probability at 0% for this prediction market. Despite heightened public interest and recent administrative actions, no member of the President, Cabinet, Joint Chiefs, or federal agency has made the required declaration before the settlement deadline of 31 December 2026.

Historically, official releases on UFOs have failed to confirm alien origins. The first tranche of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE), released by President Trump in May 2026, contained unresolved cases with no evidence of extraterrestrial life, as confirmed by the Pentagon and independent astronomers [2]. Similarly, congressional testimony from whistleblower David Grusch regarding non-human biologics was dismissed by the Defense Department as unsubstantiated [3]. These precedents frame the current 0% probability as consistent with past outcomes rather than an anomaly.

Traders should monitor upcoming releases from the new White House UFO advisory council led by Avi Loeb, appointed in 2026 to assess national security risks from unidentified anomalous phenomena [1]. The Pentagon has confirmed that additional documents are actively being processed, with a second set released on 22 May 2026 and more expected soon [2]. Any official confirmation would likely emerge from these forthcoming disclosures or from direct statements by senior government figures, making the council’s reports and Pentagon updates the primary catalysts to watch.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Will the US confirm that aliens exist by 2027? 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

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.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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.

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.