Health prediction markets launch amid regulatory concerns

Polymarket and Kalshi open health contract markets drawing expert warnings

Polymarket has begun listing public health contracts, joining Kalshi, which opened health-related event markets earlier this year. Users can now wager on FDA vaccine approvals, CDC policy changes, measles case counts, and drug trial outcomes on both platforms.

The expansion drew immediate criticism from public health researchers. Matthew Eisenberg, professor and chair of health policy and management at the Johns Hopkins Bloomberg School of Public Health, said the platforms will list contracts on anything with a checkable outcome. Lia Nower, director of the Center for Gambling Studies at Rutgers University, described current prediction market regulation as effectively absent at the federal level, with no body setting minimum standards for states to follow.

Nower identified a specific conflict-of-interest risk: advocates or lawmakers could hold open positions on contracts tied to vaccine mandate legislation and then introduce or vote on the relevant bills. No existing law prohibits that.

Both platforms classify their products as financial derivatives regulated under federal commodities law by the CFTC, not as gambling subject to state oversight. Several states have filed lawsuits contesting that classification. The health contract expansion adds a new category of contracts to that unresolved legal argument, at a moment when the CFTC's authority over event contracts is already being tested in multiple federal courts.