EnvironmentapiKeyHTTPSNo CORS
Environment
SustainMetrics
18,000+ GHG emission factors from DEFRA, EPA, ADEME, Ember.
SustainMetrics API is a free Environment API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
- Authentication
- apiKey
- HTTPS
- Yes
- CORS
- Yes
- Category
- Environment
Visit documentation ↗www.sustainmetrics.net
About SustainMetrics
Free GHG emissions calculator. 18K+ official factors from UK DEFRA 2026, US EPA 2025, ADEME. Scope 1, 2 & 3 carbon footprint — no signup.
- Provider
- SustainMetrics
- Website
- sustainmetrics.net ↗
Details from sustainmetrics.net.
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SustainMetrics API FAQ
Who provides the SustainMetrics API?
The SustainMetrics API is provided by SustainMetrics (sustainmetrics.net). Free GHG emissions calculator. 18K+ official factors from UK DEFRA 2026, US EPA 2025, ADEME. Scope 1, 2 & 3 carbon footprint — no signup.
Is the SustainMetrics API free?
Yes. The SustainMetrics 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.
Does the SustainMetrics API require an API key?
Yes. The SustainMetrics API uses apiKey authentication, so you need to register for credentials before making requests.
Can I call the SustainMetrics API from the browser?
Yes. The SustainMetrics API supports CORS, so front-end JavaScript can call it directly.
Does the SustainMetrics API support HTTPS?
Yes. The SustainMetrics API is served over HTTPS, so it's safe to use in production.