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Music Note Parser (Scientific Pitch Notation)
x402
Music Note Parser (Scientific Pitch Notation) is a paid API for AI agents from music.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Parses a note in scientific pitch notation (e.g. 'A4', 'C#5', 'Bb3') into its letter, accidental, pitch class (0–11), octave, MIDI number, and frequency in Hz.
Price / call$0.002
Success—
StatusUnknown
How this service works
Parse a note in scientific pitch notation (e.g. "A4", "C#5", "Bb3") into its letter, accidental, pitch class (0..11), octave, MIDI number and frequency in Hz (A4 = 440 Hz).
Output
Returns the note's letter (e.g. 'C'), accidental (e.g. '#', 'b', or none), pitch class (integer 0–11), octave number, MIDI note number (0–127), and frequency in Hz (A4 = 440 Hz).
Example use cases
MIDI note lookup for composition tool
“What is the MIDI number and frequency of F#4? I'm building a synthesizer patch and need the exact values.”
Frequency display in a tuner app
“I need the frequency in Hz for the note Bb3 so I can show it on a tuning display.”
Music theory education breakdown
“Can you break down the note Eb5 into all its components — the letter, accidental, pitch class, octave, MIDI number, and Hz — so I can explain it to a student?”
Technical details
Endpoint
POSThttps://music.openverbs.com/v1/noteWhen to prefer
Use this endpoint when you need to programmatically decompose a note written in scientific pitch notation into its acoustic and MIDI properties. Ideal for music theory tools, synthesizer apps, tuners, or any workflow that needs frequency, pitch class, or MIDI number from a human-readable note name. Prefer this over manual lookup tables or formula-based computation when you want a validated, authoritative parse.
Side effects
- Invalid or malformed note string (e.g. 'Z4', 'C##5') returns an error
- Note out of MIDI range may return an error or null MIDI number
- Empty or missing 'note' field returns a validation error
- Ambiguous enharmonic spellings may be normalized or rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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