The potential for coexistence between fast payment systems (FPSs) and digital currencies presents a significant opportunity to enhance the global digital financial ecosystem. Harmonizing regulations for FPSs and digital currencies is crucial for compliance, security and seamless integration, and investments in digital infrastructure and the development of open application programming interfaces will support communication between FPSs and blockchain platforms. In addition, global standards and cross-border agreements are essential to enable smooth international transactions using both systems, and collaboration between governments, central banks, and fintech and blockchain developers will accelerate innovation and ensure a secure, inclusive global financial ecosystem.