[Kalshi Weekly Nominal Trading Volume Exceeds $4.13 Billion, Approximately 2.13 Times That of Polymarket] Odaily Planet Daily News: According to Predictefy data, from May 8 to May 15, Kalshi's weekly nominal trading volume reached $4.134 billion, ranking first in the prediction market, approximately 2.13 times the trading volume of Polymarket during the same period. Polymarket's weekly nominal trading volume was $1.938 billion, ranking second. Additionally, Limitless's weekly nominal trading volume was $600 million, ranking third; predict.fun's weekly nominal trading volume was $232 million, ranking fourth; and Opinion's weekly nominal trading volume was $207 million, ranking fifth.