Free Environment APIs with no API key

15 Environment APIs that need no API key, account or credit card. 6 of them also allow CORS, so you can call them straight from browser JavaScript. Listed by uptime and ease of use.

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

   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
6. 6

   Danish data service Energi API

   Online · 867 ms

   Open energy data from Energinet to society.

   • No API key needed
   • 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. 9

   Solematica API

   Online · 719 ms

   Compare Italian solar (photovoltaic) installer offers, energy prices (PUN/ARERA) and satellite roof data.

   • No API key needed
   • HTTPS

   No authHTTPSNo CORS
10. 10W

    Website Carbon API

    Online · 684 ms

    API to estimate the carbon footprint of loading web pages.

    • No API key needed
    • HTTPS

    No authHTTPSCORS ?
11. 11

    CO2 Offset API

    Online · 1414 ms

    API calculates and validates the carbon footprint.

    • No API key needed
    • HTTPS

    No authHTTPSCORS ?
12. 12

    Luchtmeetnet API

    Online · 1433 ms

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

    • No API key needed
    • HTTPS

    No authHTTPSCORS ?
13. 13

    PVGIS API

    Online · 1535 ms

    EU solar radiation and photovoltaic performance estimates.

    • No API key needed
    • HTTPS

    No authHTTPSNo CORS
14. 14

    GrünstromIndex API

    Online · 648 ms

    Green Power Index for Germany (Grünstromindex/GSI).

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

    No authNo HTTPSCORS
15. 15N

    National Grid ESO API

    Last check failed

    Open data from Great Britain’s Electricity System Operator.

    • No API key needed
    • HTTPS

    No authHTTPSCORS ?

Keyless Environment APIs compared

Environment APIs with no API key

API	API key	HTTPS	CORS	Uptime	Response	Rating
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
GridVigil	No	Yes	Yes	Up	1588 ms	Not rated
Danish data service Energi	No	Yes	Unknown	Up	867 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
Solematica	No	Yes	No	Up	719 ms	Not rated
WWebsite Carbon	No	Yes	Unknown	Up	684 ms	Not rated
CO2 Offset	No	Yes	Unknown	Up	1414 ms	Not rated
Luchtmeetnet	No	Yes	Unknown	Up	1433 ms	Not rated
PVGIS	No	Yes	No	Up	1535 ms	Not rated
GrünstromIndex	No	No	Yes	Up	648 ms	Not rated
NNational Grid ESO	No	Yes	Unknown	Down	–	Not rated

See also: best Environment APIs · all 30 Environment APIs · every API with no key