Will 227 million Americans have received at least one dose of an approved Covid-19 vaccination by November 1?

This is a market on whether 227 million people in The United States of America will have initiated vaccination, according to the CDC COVID tracker, by the resolution date, November 1, 2021, 8:00 PM ET. This market will resolve to "Yes" if 227 million people or more are listed as having received their initial dose of vaccination by the resolution source. This only concerns the first dose of vaccination. For vaccines requiring two doses for inoculation, this market considers only the first dose as having initiated vaccination. This market will resolve to "No" if, for any reason, fewer than 227 million people have initiated vaccination by the resolution date. The resolution source for this market will be the official data published by the CDC available at https://covid.cdc.gov/covid-data-tracker/#vaccinations, and will be checked at the resolution time/date. If the website is down, the most recently available data will be used to resolve the market. If the website is not down, this market will resolve according to the data as available immediately at the time of resolution, and resolution will not be delayed for the purpose of waiting for updated data from a specific date.

How trading works

Polymarket uses a central limit order book (CLOB) model — you can buy or sell shares of any outcome at the current market price, or place limit orders at your target price. All positions are settled in USDC when the market resolves.

Resolution

Markets resolve through UMA's Optimistic Oracle. After the market closes, a proposer submits a resolution, followed by a 2-hour dispute window. If no dispute is raised, the resolution is accepted. Disputed markets go to UMA token holder vote.