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Saylor Innovations Music Key Finder
x402
Saylor Innovations Music Key Finder is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).
Analyzes a set of notes or chords to return ranked candidate musical keys, out-of-key notes, modes, and Roman numeral chord analysis
Price / call$0.01
Success—
StatusUnknown
How this service works
Ranked candidate keys, out-of-key notes, modes and Roman numeral analysis
Output
Returns a ranked list of candidate musical keys with fit scores, identification of out-of-key notes, possible modes associated with the best-fit keys, and Roman numeral analysis of any chords provided relative to the detected key.
Example use cases
Identify key from a melody
“I've been playing around with the notes C, D, E, G, and A — can you figure out what key or mode that most likely belongs to, and flag any notes that seem out of key?”
Chord progression key analysis
“I have a chord progression: C Am F G7 — what key is it in, what are the candidate keys ranked by fit, and can you show me the Roman numerals for each chord?”
Weighted note key detection
“I've counted how often each note appears in my song: C appears 8 times, E 4 times, G 5 times, A 3 times — what's the most likely key, and are there any out-of-key notes?”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/music/key-finder?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need music-theory-grounded key detection from a set of notes or chords, especially when you want ranked alternatives, modal identification, or Roman numeral harmonic analysis — rather than just a simple best-guess key name.
Side effects
- Missing both notes and chords parameters returns an error or empty result
- Unrecognized note names or chord symbols may be ignored or cause a parse error
- Very ambiguous note sets may return multiple equally-ranked keys with low confidence
- Malformed weight syntax (e.g. C-8 instead of C:8) may be ignored silently
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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