Useful list - Thanks!
As far as I know:
For the endpoints that are Rate Limited but do not have a specific rate limit like /direct_messages/new.json, /friendships/create.json (/statuses/update should be included in that too?) - this is by design - More info on these here: https://support.twitter.com/articles/15364 monitoring these rate limits is a bit more complicated.
Most endpoints in the first list look like they aren’t public, so probably shouldn’t be used (likely to change, probably restricted etc) - The exception is /collections/* - Collections API info here: https://dev.twitter.com/rest/collections - again, the “read” collections endpoints have a ratelimit of 1000, the “write” endpoints are unspecified, so probably 15, but may be restricted in other ways like other “write” endpoints like /statuses/update
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Also: HA! I hit a rate limit clicking through the documentation
