# Services from music.openverbs.com on Zero

> music.openverbs.com serves 5 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/music.openverbs.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/music.openverbs.com/health.json

## Services

- [Music Scale Builder](https://www.zero.xyz/c/music-scale-builder-64d54864/llms.txt): $0.002/call via x402. Builds a musical scale from a root note and scale type, returning note names, MIDI numbers, and semitone intervals
- [Music OpenVerbs Chord Builder](https://www.zero.xyz/c/music-openverbs-chord-builder-65d44263/llms.txt): $0.002/call via x402. Builds a chord from a root note and quality, returning note names, MIDI numbers, and semitone intervals spelled by stacked thirds.
- [Music Interval Calculator](https://www.zero.xyz/c/music-interval-calculator-5734378d/llms.txt): $0.002/call via x402. Names the musical interval between two notes, returning semitone count, diatonic number, and quality (perfect/major/minor/augmented/diminished) with correct enharmonic spelling awareness.
- [Music Note Parser (Scientific Pitch Notation)](https://www.zero.xyz/c/music-note-parser-scientific-pitch-notation-b0739f1c/llms.txt): $0.002/call via x402. 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.
- [music.openverbs.com Transpose Note](https://www.zero.xyz/c/music-openverbs-com-transpose-note-679a0c1f/llms.txt): $0.002/call via x402. Transposes a musical note up or down by a specified number of semitones, returning the result spelled with sharps or flats.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)