It is the latest price of the Yes outcome. Traders pay that share of a dollar for a contract that pays $1 if the event happens, so the price reads as the market's estimate of the chance.
Who decides the result?
The market resolves by the rules below. Polymarket uses the UMA optimistic oracle: anyone can propose the outcome and dispute it during a challenge period.
Can I bet from COINMAG?
Yes, where Polymarket is available. You connect your own wallet; the bet goes to Polymarket and the money never passes through COINMAG.