Polymarket and Kalshi are strengthening anti-fraud and market-surveillance measures during the World Cup period as prediction markets expand trading on real-world events. The Information reported on June 16 that both platforms were stepping up protections as activity grows, while Kalshi separately added Solidus Labs to bolster platform surveillance and compliance. The Information also reported that Kalshi's annualized revenue reached about $1.5 billion in May, underscoring the sector's rapid growth alongside increasing fraud and market-abuse risks.