Overview

A libraly for C#, You can get Youtube Live Chat with it without Youtube API.
You can use to develop a software,Unity,etc.

Github

Usage

using YoutubeLiveChatSharp;

var chat = new ChatFetch(liveID);
var comments = chat.Fetch();

liveID is the part that corresponds to "xxxxxxxxxxx" below.

https://www.youtube.com/watch?v=xxxxxxxxxxx

The Fetch function retrieves comments sent after the last call.

Call them regularly, not just once.

Github