For the same question on Kalshi and Polymarket we will often see vastly different prices due to resolution criteria Who will Donald Trump talk to in November? - Zelensky (Yes) - On Kalshi trading at 47 - On PM trading at 1.7 (best asks) Pretty straightforward reason - the former counts video conferences while the latter doesn't. Time Person of the Year markets Subtle differences - Kalshi allows multiple winners (ie. if Time designates "Biden and Kamala", then both are winners, whereas Poly only credits the first-mentioned name). Kalshi allows pictures of winners to qualify, whereas PM does not. "The person must be explicitly named as the Person of the Year or pictured on the/a relevant cover if they are associated with the group/concept winning (the picture is only relevant for a natural human being winning)." - Kalshi Rotten Tomatoes Markets Pictured: Zootopia to hit >(=) x on Rotten Tomatoes on Y date PM vs Kalshi The Kalshi market specifies that the score target must be above 90. Polymarket allows Yes resolution for numbers that are “at least equal to the specified number”. Kalshi: “...(for example, a score of 75 would resolve "Above 75" as No.) Now, does this deserve a 23c gap? You could 1. Sell >= 90 on PM for 93c 2. Buy > 90 on Kalshi for 70c If >= 90 - +30 Kalshi - 7 PM = 23 If < 90 - +93 PM - 70 Kalshi = 23 If 90! ...