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How much does the Bluesky API cost?
You buy credit packs (or use the 100 free signup credits). Documented Bluesky lookups are 1 credit each on success. Always trust meta.creditsCharged on the response. There is no required monthly subscription for pay-as-you-go packs.
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This answer comes from Bluesky data API, which covers the full detail, endpoints and pricing in credits.