Polymarket reportedly faced at least $10 million in attempted stolen-card fraud during February this year.Checkout.com reportedly rejected more than 80% of Polymarket US deposits as fraudulent during February’s peak.Polymarket says fraud rates later returned to industry norms after stronger card controls were introduced.Polymarket US operates through QCX, a CFTC-designated contract market subject to federal derivatives oversight today.Polymarket recently hired Warren Jenson as CFO while expanding compliance, investigations and risk management staffing.