CO2 Offset API alternatives

API calculates and validates the carbon footprint. 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, CO2 Offset API: No API key needed · 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

   Danish data service Energi API

   Online · 867 ms

   Open energy data from Energinet to society.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
6. 6

   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
7. 7

   UK Carbon Intensity API

   Online · 869 ms

   The Official Carbon Intensity API for Great Britain developed by National Grid.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
8. 8

   PM2.5 Open Data Portal API

   Online · 1110 ms

   Open low-cost PM2.5 sensor data.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
9. 9W

   Website Carbon API

   Online · 684 ms

   API to estimate the carbon footprint of loading web pages.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
10. 10

    Luchtmeetnet API

    Online · 1433 ms

    Predicted and actual air quality components for The Netherlands (RIVM).

    • No API key needed
    • HTTPS

    No authHTTPSCORS ?

CO2 Offset API vs alternatives

CO2 Offset API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
CO2 Offset	No	Yes	Unknown	Up	1414 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
Danish data service Energi	No	Yes	Unknown	Up	867 ms	Not rated
GridVigil	No	Yes	Yes	Up	1588 ms	Not rated
UK Carbon Intensity	No	Yes	Unknown	Up	869 ms	Not rated
PM2.5 Open Data Portal	No	Yes	Unknown	Up	1110 ms	Not rated

See also: best Environment APIs · all Environment APIs