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Website Carbon Estimate
x402
Website Carbon Estimate is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054001/call, status unknown (last checked 2026-09-15).
Estimates CO2 emissions per page view for a given website URL using the Website Carbon methodology, returning an A–F rating and annual emissions estimate.
Price / call$0.054001
Success—
StatusUnknown
How this service works
Estimate CO2 emissions per page view using the Website Carbon methodology. Returns rating A-F, annual estimate.
Output
Returns a carbon rating on an A–F scale, estimated CO2 grams per page view, and an annual CO2 emissions estimate for the given website URL, calculated using the Website Carbon methodology.
Example use cases
Example prompt
“What's the carbon footprint of example.com per page view? Give me the Website Carbon rating and annual CO2 estimate.”
Technical details
Endpoint
GEThttps://api.strale.io/x402/website-carbon-estimateWhen to prefer
Use this endpoint when you need a standardized, methodology-backed sustainability score for a website and want a letter grade (A–F) alongside numerical CO2 estimates. Prefer this over generic carbon calculators when you need the widely recognized Website Carbon rating specifically.
Side effects
- Invalid or unreachable URL returns an error
- Missing required 'url' query parameter returns validation error
- Rate limiting or payment failure returns 402 or 429
- Domain resolves but page is inaccessible, leading to incomplete data
Input
{
"url": "https://www.example.com"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"url": "https://www.example.com",
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.054000000000000006,
"settlement_id": "0x39a179a38adc22a2b6f5aa25f244840cc307d1d32c26055fb8ae1078f0586421"
},
"capability": "website-carbon-estimate",
"latency_ms": 16,
"provenance": {
"source": "page-analysis",
"fetched_at": "2026-06-13T04:24:19.845Z"
}
},
"rating": "A",
"methodology": "Website Carbon / Sustainable Web Design model",
"page_size_kb": 1,
"annual_co2_kg": 0.02,
"green_hosting": "unknown",
"page_size_bytes": 559,
"recommendations": [
"This page is already lightweight. Maintain current optimization practices."
],
"transfer_encoding": "br",
"co2_grams_per_view": 0.0001,
"annual_co2_kg_custom": null,
"cleaner_than_percent": 100
}Tags
x402
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