xtwitterapiprices Who changed their prices.
Pricing pages get edited quietly. Every re-read of a provider's own page is diffed against the last one, and anything that moved lands here with the date and the source.
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First capture: 25 X APIs
Every seller's published price read off its own pricing page or docs and normalized to cost per 1,000 tweets, profiles or accounts at four monthly volumes. Where a seller bills per request rather than per item, the printed page size is used, and where it prints none the site's own stated assumption applies. From here each page is re-read and any change is logged here with the before and after.