Total neck tension of a set

Code snippets

curl "https://api.oanor.com/guitar-api/v1/set-tension" \
  -H "x-oanor-key: oanor_test_..."

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

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

Example response

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

{
    "data": {
        "note": "Total neck load = the sum of every string's tension — a typical 6-string set runs ~95–120 lb. The neck and truss rod are set up for that load, so a big jump (heavier gauge, higher tuning) bows the neck and needs a re-setup; a big drop leaves it back-bowed. Keep the total in the same ballpark when you change strings.",
        "inputs": {
            "frequencies_hz": [
                82.41,
                110,
                146.83,
                196,
                246.94,
                329.63
            ],
            "scale_length_in": 25.5,
            "unit_weights_lb_in": [
                0.0003297,
                0.0001705,
                8.89e-5,
                6.402e-5,
                3.744e-5,
                2.215e-5
            ]
        },
        "total_tension_kg": 40.8,
        "total_tension_lb": 90,
        "per_string_tension_lb": [
            15.07,
            13.89,
            12.9,
            16.56,
            15.37,
            16.2
        ]
    },
    "meta": {
        "timestamp": "2026-06-06T23:54:00.458Z",
        "request_id": "6871c9ec-099c-428a-9384-ff7ee3e6fcc6"
    },
    "status": "ok",
    "message": "Set tension",
    "success": true
}