Linear groove speed at a radius

Code snippets

curl "https://api.oanor.com/vinyl-api/v1/groove-speed" \
  -H "x-oanor-key: oanor_test_..."

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

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

Example response

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

{
    "data": {
        "note": "The linear speed the stylus sees = the angular speed × the radius (v = 2π × rpm/60 × r). On a constant-rpm record the outer grooves pass the stylus far faster than the inner ones — about 50 cm/s at the start of a 12-inch LP but only ~20 cm/s near the label. Less groove length per second at the inside means less room for detail, the cause of 'inner-groove distortion' and why engineers put quieter tracks last.",
        "inputs": {
            "rpm": 33.333,
            "radius_mm": 145
        },
        "linear_speed_m_per_s": 0.5061,
        "linear_speed_cm_per_s": 50.61
    },
    "meta": {
        "timestamp": "2026-06-07T08:17:49.453Z",
        "request_id": "ec7a6301-e3c6-4e92-8378-97f8e0e8d80d"
    },
    "status": "ok",
    "message": "Groove speed",
    "success": true
}