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GET /v1/rooftypes

Runoff coefficient reference

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/rainwater-api

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Code snippets

curl "https://api.oanor.com/rainwater-api/v1/rooftypes" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/rainwater-api/v1/rooftypes", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/rainwater-api/v1/rooftypes");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/rainwater-api/v1/rooftypes",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Runoff (collection) coefficients are typical values; smooth metal roofs collect the most, green roofs the least.",
        "roof_types": {
            "metal": 0.9,
            "gravel": 0.7,
            "concrete": 0.8,
            "clay_tile": 0.8,
            "green_roof": 0.3,
            "glazed_tile": 0.85,
            "concrete_tile": 0.8,
            "asphalt_shingle": 0.85
        },
        "default_coefficient": 0.85
    },
    "meta": {
        "timestamp": "2026-06-04T01:59:12.201Z",
        "request_id": "eaa13d47-233c-440b-a26e-4b2ed57b92f2"
    },
    "status": "ok",
    "message": "Runoff coefficient reference",
    "success": true
}