FraudSphere leverages adversarial risk analysis combined with large language model-based generative simulation to create a continuously learning fraud detection system. It simulates realistic, multi-agent fraud scenarios to identify vulnerabilities and inform policy design, utilizing Bayesian decision logic to adapt and improve over time. Designed for scalability and cost-effective deployment via API or cloud environments, FraudSphere supports a wide range of sectors including AI, digital transformation, space, defense, and mobility.