Website Carbon API
FreeLiveLast verified 24 Sept 2026
Estimates a webpage's CO2 emissions and carbon rating from its transfer size and hosting type.
Example request
curl -s 'https://api.websitecarbon.com/data?bytes=1000000&green=0'
Free tier, in plain English
Free and keyless; the docs only warn that endpoints and response shapes may change without notice, with no published call cap.
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