The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/

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README.md

gRPC C# on Unity

EXPERIMENTAL ONLY

Support of the Unity platform is currently experimental.

PREREQUISITES

Unity 2018.3.5f1

BUILD

Follow instructions in https://github.com/grpc/grpc/tree/master/src/csharp/experimental#unity to obtain the grpc_csharp_unity.zip that contains gRPC C# for Unity. Unzip it under Assets/Plugins directory.
Open the HelloworldUnity.sln in Unity Editor.
Build using Unity Editor.