Card plan management party (U-card project party, responsible for product design and user operation), fiat cryptocurrency exchange providers (such as MoonPay, Circle API, handling on chain asset and fiat currency exchange), and card production and technology integration service providers (providing physical card production or virtual card API integration, supporting binding with Google Pay, etc.). Through the collaboration of these links, U-cards enable users to seamlessly purchase real-world goods or services using on chain assets, demonstrating the unique value and complexity of Web3 payment tools in connecting traditional finance and blockchain technology.