Will the US confirm that aliens exist by October 31? Odds and prices
"Will the US confirm that aliens exist by October 31" is priced at 0% on Polymarket and 1% on Kalshi, where Kalshi has no live quote: the venues disagree, so <1% is their average, not a consensus. The contract settles by Oct 31, 2026; each venue words its settlement rules itself, compared below.
This question on Polymarket and Kalshi.
Odds by venue
| Venue | Yes | No | Fee | 24h volume | Liquidity | |
|---|---|---|---|---|---|---|
| PolymarketClose-only for US residents | <1¢ | >99¢ | free | $33K | $213K | Trade → |
| Kalshi$50 bonus | 1¢ | >99¢ | <0.1¢ | $2K | – | Trade → |
How the odds have moved
One venue's series for the result the headline prices, not a blend; venues tick at different cadences and interpolating one onto the other would invent points.
What the market is actually pricing
Venues word settlement differently for the same question, and the difference decides who gets paid. This is the comparison no venue publishes about its rivals.
This market will resolve to "Yes" if the President of the United States, any member of the Cabinet of the United States, any member of the Joint Chiefs of Staff, or any US federal agency definitively…
Full settlement wording
This market will resolve to "Yes" if the President of the United States, any member of the Cabinet of the United States, any member of the Joint Chiefs of Staff, or any US federal agency definitively states that extraterrestrial life or technology exists by October 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No".
The primary resolution source for this market will be official information from the government of the United States, however a consensus of credible reporting will also be used.
If the President, any member of the Cabinet, any member of the Joint Chiefs of Staff, or any US federal agency definitively states that extraterrestrial life or technology exists before Nov 1, 2026,…
For purposes of this Contract, the Cabinet includes the heads of the 15 government agencies in the Cabinet as of Issuance, as well the Administrator of the EPA, the President's Chief of Staff, Director of National Intelligence, Director of OMB, Director of CIA, United States Trade Representative, Ambassador to the UN, Chair of the Council of Economic Advisers, Administrator of the SBA, and Director of OSTP.
Where you can trade this
The Trade links in the tables above open each venue's own market. The reviews cover sign-up, funding and payouts.
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Common questions
What are the odds on "Will the US confirm that aliens exist by October 31"?
The venues disagree: 0% on Polymarket and 1% on Kalshi. The <1% shown is their average; the gap often comes from settlement rules worded differently, compared on this page.
Where can I trade "Will the US confirm that aliens exist by October 31"?
On Polymarket and Kalshi. Availability by state varies for sports contracts; see the legal pages.
Why do the venues show different prices?
Different traders, different fees, and different settlement wording. The gap is the reason this page exists; the cheaper side is marked in the table.