WebSocket nodes: real-time subscriptions on wss endpoints

WebSocket is used to enable real-time communication between the client and a node. A typical Node.js WebSocket server can push data instantly to clients, making it especially useful for applications requiring live updates, such as financial dApps or gaming platforms.

A node with WebSockets connection makes possible tasks like monitoring transactions and receiving event updates without needing to constantly re-establish a connection, as opposed to the more traditional request-response flow of JSON-RPC.

While WebSockets focus on communication efficiency, GraphQL emphasizes data retrieval efficiency. GraphQL provides a structured way to request specific data. On the other hand, node WebSocket clients have a continuous connection to a server, making it more suitable for applications requiring constant data flow.