The user @CookerFlips claims a 90% win rate on Kalshi, a platform for event contracts, turning $11k into $19k. The screenshot shows successful trades on various sports events, primarily tennis (WTA Wuhan, ATP Shanghai) and some baseball/football, with returns ranging from 6% to 49%. This suggests potential profitability in event-based predictions on Kalshi, though past performance does not guarantee future results.