YouTube
YouTube Comments API — Fetch a Comment’s Reply Thread
Paste the reply continuation token that a first-level YouTube comment exposes. You can also set the country, language, and whether the replies should be cleaned up. A video ID or URL will not work; the token is required.

You receive
Returns that comment’s second-level replies with the next reply token when more remain. It does not list a video’s top-level comments, search comments, post or moderate replies, or accept a video URL. Pay per call, up to $0.0015; one Toolmu account, no subscription.
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YouTube Comments API — Fetch a Comment’s Reply Thread



