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API · /carbonfootprint-api

Carbon Footprint API

healthy 3,982 Subscribers

Estimate CO2e emissions for everyday activities using the official DEFRA 2023 GHG conversion factors: road and rail travel (per kilometre by vehicle type, split across passengers), flights (by airport IATA pair with great-circle distance, or by distance, across cabin classes and round trips), grid electricity (by kilowatt-hour and country carbon intensity) and direct fuel combustion (by litres and fuel type). A factors endpoint exposes every emission factor, supported vehicle and fuel type, and the country grid-intensity table. Each result returns CO2e in kilograms, tonnes and grams. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side compute (no third-party upstream), so responses are instant and always available. Ideal for travel and booking flows, sustainability dashboards, ESG and Scope-3 reporting, and carbon-aware product features.

#carbon #co2 #emissions #sustainability #esg #climate #data
api.oanor.com/carbonfootprint-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/carbonfootprint-api/openapi.json
/api/carbonfootprint-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
72 ms
Server probes · 24h
Subscribers
3,982
active
Total calls
15
last 7 days
status Full status page → · 15 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 22,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 22,000 calls/month, 3 req/s
  • Vehicle, flight, electricity, fuel & factors — CO2e in kg/t/g
  • No credit card
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Basic

€7.50 /month

  • 280,000 calls / month
  • 12 requests / second
  • Hard cap (429 above quota, no overage)
  • 280,000 requests/month, 12 req/s
  • All endpoints, airport-pair flight distances, 45 country grids
  • Commercial use included
  • Email support
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Pro

€23.00 /month

  • 2,200,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,200,000 requests/month, 40 req/s
  • High throughput for apps & sustainability dashboards
  • Priority email support
  • Commercial use allowed
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Mega

€58.00 /month

  • 11,000,000 calls / month
  • 120 requests / second
  • Hard cap (429 above quota, no overage)
  • 11,000,000 requests/month, 120 req/s
  • Highest throughput for ESG & Scope-3 batch reporting
  • Priority support
  • Commercial use allowed
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api.oanor.com/climate-api

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Search and filter more than 5,400 Medicare-certified hospitals across the United States and territories: filter by state, city, free-text name, hospital type (acute care, critical access, psychiatric, childrens, veterans and more), ownership category, whether the hospital offers emergency services, and the CMS overall star rating. Look up any hospital by its CMS facility id, and read metadata listing every state with its hospital count plus the available types and ownership categories for building filter UIs. Each record returns the facility id, name, full address, county, phone number, type, ownership, emergency-services flag and overall rating. Built on the official CMS Hospital General Information dataset. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side data (no third-party upstream), so responses are instant and always available. Ideal for healthcare directories, patient-facing apps, insurance and care-navigation tools, and research.

api.oanor.com/hospitals-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Carbon Footprint API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Carbon Footprint API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Carbon Footprint API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Carbon Footprint API cost?
Carbon Footprint API has a free tier with 100 calls / month. Paid plans start at €7.50 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Carbon Footprint API GDPR-compliant?
All requests to Carbon Footprint API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/carbonfootprint-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/carbonfootprint-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/carbonfootprint-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/carbonfootprint-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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