[Kalshi and Polymarket's two major platforms have added over 270,000 new users per month on average in the past two years; the latter's monthly retention rate exceeds 50%] Odaily Planet Daily News: Prediction market data platform Parity posted on Platform X, stating that since May 2024, the two major prediction markets, Kalshi and Polymarket, have added an average of 273,908 new users per month. Additionally, Polymarket's retention rate is remarkable: a monthly retention rate of 50.2% and a 3-month retention rate of 30%. Note: Kalshi's new user data is based on publicly available user data; retention rate data is calculated solely based on Polymarket's data.