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Music Theory Chord Namer
x402
Music Theory Chord Namer is a paid API for AI agents from music-theory.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Identifies the best chord name, inversion, and alternative names from a set of input notes, treating the first note as the bass.
Price / call$0.02
Success—
StatusUnknown
How this service works
Name a chord from its notes (C E G Bb, A C E G): best name, inversion and alternative names; first note is the bass.
Output
Returns the best chord name (e.g. 'C7'), the inversion number (0 = root position), root note, chord quality, a human-readable summary, alternative chord names, pitch class integers, a boolean for root position, and optional reasons or disclaimers about the identification.
Example use cases
Identify a jazz chord voicing
“I'm looking at a chord on the piano with the notes F A C Eb from lowest to highest — what chord is that, what inversion is it in, and are there any alternative names I should know?”
Confirm chord name while composing
“I've got these notes stacked up: B D F A — can you tell me the chord name, whether it's in root position, and any other names it might go by?”
Analyze bass-inverted chord in a score
“There's a chord in this piece where G is in the bass and the other notes are C and E above it — what's the chord name and inversion?”
Technical details
Endpoint
GEThttps://music-theory.x402tookit.com/chord-name?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have a set of note names and need to identify the chord they form, including its inversion and alternative names. Prefer it over chord-spelling endpoints (which go symbol→notes) when your input is notes and your output goal is a chord symbol or name.
Side effects
- Invalid or unrecognized note names return an error or null result
- Ambiguous note sets with multiple equally valid interpretations may return degraded=true with caveats
- Fewer than two notes provided may not yield a meaningful chord name
- Non-standard enharmonic spellings may not be recognized
- Network or payment authorization failure returns HTTP 402 or 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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