M
API Matrix

CO2 Offset API

⭐ Beginner's Pick Environment / No Auth Required Beginner HTTPS
Free to Use Varies (check documentation)
82 Score
Grade A
Visit Official Site Compare Alternatives

Overview

CO2 Offset API calculates and validates the carbon footprint of electricity consumption using the Sustainable Scope 2 framework. It is free to use with no API key required, making it accessible for developers exploring carbon accounting in energy apps. Simply provide a zip code and energy usage to receive CO2 emission estimates.

💡

Beginner Tip

No authentication is needed — just call the endpoint with a German postal code and energy amount in kWh to get a CO2 calculation instantly. This API is best suited for electricity-related carbon footprint calculations in Germany.

Available Data

vehicle make and model
year and specifications
fuel economy
VIN decode data

Example Response

JSON Response 
{
  "make": "Toyota",
  "model": "Camry",
  "year": 2025,
  "engine": "2.5L 4-cylinder",
  "fuel_economy": {
    "city_mpg": 28,
    "highway_mpg": 39
  },
  "msrp": 28400
}

Field Reference

co2eq CO2-equivalent grams emitted for the specified energy consumption
zip The postal code used for the regional grid mix calculation
kwh The energy amount in kilowatt-hours that was used for the calculation
gsi GrünstromIndex value indicating the percentage of green energy in the local grid at calculation time

Implementation Example 

const url = "https://co2offset.io/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Empty or null response The postal code provided does not exist in the German grid data
✓ Use a valid German 5-digit postal code; the API currently only covers Germany
400 Bad Request Missing required query parameters such as zip or kwh
✓ Ensure both "zip" (German postal code) and "kwh" (energy amount) parameters are included in the request URL
Unexpected 0 CO2 value The region may have 100% renewable energy at that moment
✓ This is valid — the API reflects real-time grid mix; try different times of day to see varying CO2 values

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 15/20
🔒 Security 15/15
🛠 Developer XP 15/20
✓ Reliability 7/15
Response Time 445ms

Fully tested on Apr 5, 2026

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS UNKNOWN
Category Environment
Difficulty Beginner
Verified: 2026-04-07

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