Ethereum-swift

JSON-RPC is a stateless, light-weight remote procedure call (RPC) protocol. Primarily the specification defines several data structures and the rules around their processing. It is transport agnostic in that the concepts can be used within the same process, over sockets, over HTTP, or in many various message passing environments. It uses JSON (RFC 4627) as data format.

https://ethereum.org/en/developers/docs/apis/json-rpc/

https://www.jsonrpc.org/specification

The Client is defined as the origin of Request objects and the handler of Response objects.
The Server is defined as the origin of Response objects and the handler of Request objects.

https://ethereum.org/en/developers/docs/apis/backend/#available-libraries

https://github.com/ethereum/execution-apis

https://github.com/argentlabs/web3.swift