Hello is there any extension that's allow to get link to the newest video in the chanell ?
And what platform is this "channel" on? YouTube?
yes sorry for my ortograffy my English is really bad
This link might help you: Search: list | YouTube Data API | Google Developers.
any free option?
YouTube API is free.
or esier versio
This is the easiest, and, afaik, the only possible method of doing so.