Resolution criteria on PolyGram: This market will resolve to "Yes" if there is a newly confirmed case of Hantavirus in the territory of the United States of America reported between market creation and May 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". Any laboratory-confirmed hantavirus infection identified within U.S. territory will qualify, regardless of where exposure or symptom onset occurred. The primary resolution source for this market will be official government information (e.g., the CDC); however, an overwhelming consensus of credible reporting will also suffice.
PolyGram is an on-chain prediction market where you trade YES or NO outcome shares with real USDC on Polygon. For this market, buy YES if you believe the event will happen, or NO if you think it won't. Your maximum loss is your stake — winning shares pay $1.00 each at resolution. Unlike sportsbooks, there is no house edge: prices are set by supply and demand from other traders and reflect the crowd's real-time probability.
Market outcomes
| Another confirmed case of Hantavirus in US by May 31? | 100% YES | 0% NO |
Hantavirus infections in the United States remain sporadic but consistently documented. The virus, primarily transmitted through contact with infected rodent droppings, urine, or saliva, causes hantavirus pulmonary syndrome (HPS), a severe respiratory illness with historical case fatality rates around 38%. The CDC has recorded confirmed cases nearly every year since the virus was first identified in the Four Corners region in 1993, with annual incidence typically ranging from zero to a handful of cases. Between 2015 and 2023, the U.S. averaged approximately 1–2 confirmed cases annually, though some years saw no reported cases whilst others recorded clusters. Given this baseline epidemiology, the 100% implied probability on Polymarket's order book reflects the statistical likelihood that at least one laboratory-confirmed case will emerge across the entire United States territory within a 19-month window.
Traders monitoring this market should track CDC disease surveillance announcements, particularly their weekly FluView reports and hantavirus-specific updates, which represent the primary official reporting mechanism. Seasonal patterns matter: hantavirus cases typically peak in autumn and winter when rodent populations move indoors and human exposure increases. Recent regional rodent population surveys and any unusual clustering of respiratory illness cases in rural or semi-rural areas could serve as early signals. State health departments occasionally announce cases before CDC consolidation, so monitoring regional public health bulletins provides an information edge. The resolution hinges entirely on confirmed laboratory diagnosis reported through official channels, making CDC acknowledgement the decisive catalyst.
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a two-hour dispute window opens, and if no one stakes a counter-claim the payout is final. Contested outcomes escalate to UMA token-holder voting. Payouts clear in USDC to the winning side.
The mechanics for trading "Another confirmed case of Hantavirus in US by May 31?" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.
$23K in lifetime turnover and $0 of resting liquidity puts this market in the around the median by volume for pop culture contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.
The market has been open for under a month — fresh enough that information asymmetry remains a real factor.
Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.
As of today, traders on Polymarket price this outcome at 100%. The number updates continuously as the order book clears. PolyGram mirrors the same live odds with locale-aware formatting and USDC settlement.
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a 2-hour dispute window opens, and if uncontested the payout is final. Contested outcomes escalate to UMA token holders.
This prediction market is scheduled to close on 31 May 2026. After the resolving event occurs, settlement typically clears within 24 hours once the UMA optimistic oracle confirms the outcome. All payouts are in USDC on the Polygon network.
To trade on this prediction market, create a free PolyGram account at polygram.ink, deposit USDC via Polygon, and place a YES or NO order on the outcome you believe in. You can learn more on our how-it-works page. Your maximum loss is limited to your stake — there is no leverage or margin.
When the outcome is determined, winning YES shares pay out $1.00 each in USDC, while losing shares pay $0. Settlement is handled by the UMA optimistic oracle on Polygon — a proposer submits the result, a two-hour dispute window opens, and if uncontested, payouts are distributed automatically. You can withdraw your winnings to any Polygon wallet.
Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.
Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.
Explore more prediction market odds and trading opportunities on PolyGram: