SustainMetrics API alternatives

18,000+ GHG emission factors from DEFRA, EPA, ADEME, Ember. If it doesn't fit your project, here are the 10 best free Environment APIs to use instead in 2026, out of 29 in the directory.

For reference, SustainMetrics API: Callable from the browser (CORS) · HTTPS.

1. 1

   kanari API

   Online · 527 ms

   Real-time worldwide wildfire detections, water bomber tracking and open fire archive.

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
2. 2

   Open-Meteo API

   Online · 609 ms

   Free weather API for non-commercial use.

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
3. 3

   Sähkön hinta nyt API

   Online · 1106 ms

   Finnish and Nordic day-ahead electricity spot prices (15-minute), cheapest hours.

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
4. 4W

   WattFigure API

   Online · 712 ms

   US electricity rates by state, with appliance and EV charging running costs.

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
5. 5

   Carbon Interface API

   Online · 873 ms

   API to calculate carbon (C02) emissions estimates for common C02 emitting activities.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
6. 6

   GridHub API

   Online · 767 ms

   Live wholesale electricity prices and demand across 25 grid zones.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
7. 7

   GridVigil API

   Online · 1588 ms

   Pressure scores, demand, generation mix and alerts for the 10 major U.S. power grids.

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
8. 8

   Climatiq API

   Online · 1435 ms

   Calculate the environmental footprint created by a broad range of emission-generating activities.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
9. 9

   Danish data service Energi API

   Online · 867 ms

   Open energy data from Energinet to society.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
10. 10

    sensor.community API

    Online · 694 ms

    Community air quality sensor network data worldwide.

    • Callable from the browser (CORS)
    • HTTPS

    User-AgentHTTPSCORS

SustainMetrics API vs alternatives

SustainMetrics API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
SustainMetrics	Required	Yes	Yes	Up	697 ms	Not rated
kanari	No	Yes	Yes	Up	527 ms	Not rated
Open-Meteo	No	Yes	Yes	Up	609 ms	Not rated
Sähkön hinta nyt	No	Yes	Yes	Up	1106 ms	Not rated
WWattFigure	No	Yes	Yes	Up	712 ms	Not rated
Carbon Interface	Required	Yes	Yes	Up	873 ms	Not rated
GridHub	Required	Yes	Yes	Up	767 ms	Not rated
GridVigil	No	Yes	Yes	Up	1588 ms	Not rated
Climatiq	Required	Yes	Yes	Up	1435 ms	Not rated

See also: best Environment APIs · all Environment APIs