Spec

Code snippets

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

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

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

Example response

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

{
    "data": {
        "notes": "Notes use C, C#, Db … B (case-insensitive). Set accidental=flat to spell with flats. This is pitch-class theory; for note frequencies use a music-note API.",
        "service": "musictheory-api",
        "endpoints": {
            "GET /v1/meta": "This document.",
            "GET /v1/chord": "Chord tones from a root and chord type.",
            "GET /v1/scale": "Scale notes from a root and mode.",
            "GET /v1/interval": "Semitones and interval name between two notes.",
            "GET /v1/transpose": "Transpose notes by a number of semitones."
        },
        "chord_types": [
            "6",
            "7",
            "9",
            "major",
            "minor",
            "diminished",
            "augmented",
            "major7",
            "minor7",
            "dominant7",
            "diminished7",
            "half-diminished7",
            "minormajor7",
            "sus2",
            "sus4",
            "minor6",
            "add9",
            "power"
        ],
        "description": "Music theory: intervals, transposition, chords and scales over the 12-tone chromatic scale.",
        "scale_modes": [
            "major",
            "natural-minor",
            "minor",
            "harmonic-minor",
            "melodic-minor",
            "dorian",
            "phrygian",
            "lydian",
            "mixolydian",
            "locrian",
            "pentatonic-major",
            "pentatonic-minor",
            "blues",
            "chromatic",
            "whole-tone"
        ]
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:12.252Z",
        "request_id": "e10d6720-2365-426a-9519-a15023759ac0"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}