Spring rate from geometry

Code snippets

curl "https://api.oanor.com/springcoil-api/v1/rate" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/springcoil-api/v1/rate", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/springcoil-api/v1/rate");
curl_setopt($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/springcoil-api/v1/rate",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "Spring index C = D/d; aim for 4–12. Rate in newtons per millimetre of deflection.",
        "formula": "k = G·d⁴ / (8·D³·n).",
        "material": "music_wire",
        "spring_rate": {
            "N_per_m": 1982.5,
            "N_per_mm": 1.9825,
            "lb_per_in": 11.32037
        },
        "active_coils": 10,
        "spring_index": 10,
        "mean_diameter_mm": 20,
        "wire_diameter_mm": 2,
        "shear_modulus_mpa": 79300
    },
    "meta": {
        "timestamp": "2026-06-04T01:59:05.441Z",
        "request_id": "df41c044-e46a-4035-ab0f-3eeddd50f5c0"
    },
    "status": "ok",
    "message": "Spring rate from geometry",
    "success": true
}