API calculates and validates the carbon footprint.
CO2 Offset API is a free Environment API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Service Rahmenwerk zur Bestimmung, Berichterstattung und Kompensation der Treibhausgasemissionen für...
Details from co2offset.io.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Calculate the environmental footprint created by a broad range of emission-generating activities
API to calculate carbon (C02) emissions estimates for common C02 emitting activities
The CO2 Offset API is provided by Corrently IO (co2offset.io). Service Rahmenwerk zur Bestimmung, Berichterstattung und Kompensation der Treibhausgasemissionen für...
Yes. The CO2 Offset API is listed in the Environment category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The CO2 Offset API requires no authentication, so you can start making requests without signing up.
CORS support for the CO2 Offset API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The CO2 Offset API is served over HTTPS, so it's safe to use in production.