Macro jsonrpc_client 

macro_rules! jsonrpc_client {
    (
        $(#[$struct_attr:meta])*
        pub struct $struct_name:ident {$(
            $(#[$attr:meta])*
            pub fn $method:ident(&mut $selff:ident $(, $arg_name:ident: $arg_ty:ty)*)
                -> RpcRequest<$return_ty:ty>;
        )*}
    ) => { ... };
}

The main macro of this crate. Generates JSON-RPC 2.0 client structs with automatic serialization and deserialization. Method calls get correct types automatically.