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How much does the GitHub API cost on Social Fetch?
You buy credit packs (or use the 100 free signup credits). Most GitHub GETs list a flat credit note per successful lookup; some list-style routes may differ. There is no required monthly subscription for pay-as-you-go packs. Trust meta.creditsCharged on each response.
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This answer comes from GitHub data API, which covers the full detail, endpoints and pricing in credits.