The Memoryboard API is a .NET 8 Web API that provides backend support for the Memoryboard client. It includes endpoints for user registration, login, clipboard management, and SignalR-based real-time communication. The API supports authentication with JSON Web Tokens (JWT) and ensures secure communication through encryption and proper access control. Interacting with a relational database using EntityFramework, the API facilitates persistent storage and synchronization of clipboard content. It enables real-time synchronization across multiple client instances.