The convergence of blockchain technology and artificial intelligence (AI) is driving a paradigm shift in global payment systems. This article explores how decentralized ledgers enhance transaction transparency and security, while AI-powered tools optimize fraud detection, personalized financial services, and cross-border settlement efficiency. Case studies on central bank digital currencies (CBDCs), decentralized finance (DeFi) platforms, and AI-driven payment gateways illustrate the synergistic potential of these technologies. By 2027, the fusion of blockchain and AI is projected to reduce transaction costs by 40% and accelerate real-time payment processing to under 3 seconds globally.