In an article published on the X platform, Uniswap founder Hayden Adams pointed out that the prediction market Kalshi prices the "US acquisition of Greenland" at approximately 42%, while Polymarket prices it at only 15%–23%. This significant price difference is not due to differences in user groups, but rather to the differences in the specific betting targets themselves. If it were merely a difference in user structure, a single trader with access to both platforms could quickly close the price gap through arbitrage. However, the reality is that Polymarket prices the "probability of the event occurring within 2026 (currently around 23%)," while Kalshi prices the "probability of the event occurring throughout Trump's entire term (currently around 45%)." These are not the same event. Furthermore, differences in question wording, settlement conditions, oracle design, and different risk pricing logic all contribute to the price discrepancies.