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This has nothing to do with the new paid-only API. This specific API (full history search for the past month) has been paid for years, at those price points. cf https://blog.twitter.com/developer/en_us/topics/tools/2017/i...

What's the new "basic" tier going to look like then, if this is the existing scheme? How low can that quota go?

This is the existing scheme for one specific expensive API. Pricing for everything else clearly has nothing to do with it, and could be anything.

That's the existing premium tier, it's 500 requests per month, with 500 tweets returned per request. So 250k tweets ig