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CO2 Offset

API calculates and validates the carbon footprint

Open documentation ↗
No keyHTTPSNo CORSEnvironment

Verified 4 days ago: 100% uptime

API key

Not required

HTTPS

Supported

Browser calls

No, needs a proxy

Status

Live · 100/100

What our checks found

Health score
100/100
Reliability
100%
Average latency
1081ms

Last checked 2026-09-18. Measured independently, not self-reported by the provider.

How to call it

A starting template for CO2 Offset. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.

# No authentication required.
curl -s "https://co2offset.io/ENDPOINT" \
  -H "Accept: application/json"

This API does not send CORS headers, so a browser will block a direct call from your front end. Call it from your server, or put a small proxy in front of it.

Where this listing comes from

Aggregated from one public source (public-apis), then normalised and checked by us. If something here is wrong, tell us and we will correct it.

Other Environment APIs

See all 28

DC Hub

Environment

Live data on data-center facilities, power markets, grid telemetry, and fiber infrastructure

No keyCORSHTTPS

Verified 4 days ago: 100% uptime

View Details

Luchtmeetnet

Environment

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

No keyCORSHTTPS

Verified 4 days ago: 100% uptime

View Details

Open-Meteo

Environment

Global weather forecast API for non-commercial use

No keyCORSHTTPS

Verified 4 days ago: 100% uptime

View Details

Open-Meteo Marine

Environment

Ocean wave height, swell, sea temperature and marine weather data

No keyCORSHTTPS

Verified 4 days ago: 100% uptime

View Details

UK Carbon Intensity

Environment

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

No keyCORSHTTPS

Verified 4 days ago: 100% uptime

View Details

WattFigure

Environment

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

No keyCORSHTTPS

Verified 4 days ago: 100% uptime

View Details

CO2 Offset — common questions

Answered from what our own scheduled checks found, not from the provider's marketing.

Is CO2 Offset free to use?

CO2 Offset is listed in our free catalogue and required no credential when we called it. It needs no authentication at all, so you can send a request without signing up. Free tiers can still carry rate limits or non-commercial terms, so check the provider's own terms before shipping.

Does CO2 Offset need an API key?

No. We called CO2 Offset on 2026-09-18 with no key, no token and no Authorization header, and it responded. That is what puts it in our no-key collection.

Can I call CO2 Offset from browser JavaScript?

Not directly. CO2 Offset did not return CORS headers when we checked, so the browser will block your page from reading the response even though the request itself succeeds. Call it from a server, or put a small proxy in front of it.

Is CO2 Offset still working?

Yes, as of 2026-09-18. Our automated check reached CO2 Offset and recorded a 100% reliability score with a median response time of 1081 ms. We re-check on a schedule, and this page updates with the result.

Is CO2 Offset available over HTTPS?

Yes. CO2 Offset serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.