# Services from music-production-calc.x402tookit.com on Zero

> music-production-calc.x402tookit.com serves 9 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-production-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/music-production-calc.x402tookit.com/health.json

## Services

- [Music Production Calc – Tempo Grid](https://www.zero.xyz/c/music-production-calc-tempo-grid-b69c02f2/llms.txt): $0.02/call via x402. Calculates note duration values (1/1 to 1/32, straight/dotted/triplet) at a given BPM in milliseconds, LFO Hz, audio samples, and MIDI ticks.
- [Music Production Calc – Tap Tempo BPM Calculator](https://www.zero.xyz/c/music-production-calc-tap-tempo-bpm-calculator-3e88fa4e/llms.txt): $0.02/call via x402. Calculates mean and median BPM from a sequence of tap timestamps in milliseconds, plus interval spread and jitter statistics.
- [Music Production Calc – Song Length Calculator](https://www.zero.xyz/c/music-production-calc-song-length-calculator-6cdc8e9d/llms.txt): $0.02/call via x402. Calculates song length in seconds and M:SS from bars, BPM, and time signature, and optionally computes the bars needed or BPM required to hit a target duration.
- [Music Production Calc – Pitch/Speed Varispeed Ratio Converter](https://www.zero.xyz/c/music-production-calc-pitch-speed-varispeed-ratio-converter-9c0e6a8a/llms.txt): $0.02/call via x402. Converts semitones, cents, speed percent, two frequencies, or two BPMs into a unified varispeed ratio with all pitch/speed equivalents.
- [Music Production Calc: Key Shift](https://www.zero.xyz/c/music-production-calc-key-shift-e269a6eb/llms.txt): $0.02/call via x402. Shifts a musical key by a given number of semitones, returning the correctly spelled destination key, its mode, relative key, key signature, and capo chord shapes.
- [Music Production Calc: Fret Note Lookup](https://www.zero.xyz/c/music-production-calc-fret-note-lookup-c652f4c8/llms.txt): $0.02/call via x402. Returns the note name, MIDI number, and frequency in Hz for any fret position on guitar, bass, ukulele, or violin strings, with support for alternate tunings.
- [Music Production Calc – Diatonic Chords](https://www.zero.xyz/c/music-production-calc-diatonic-chords-ea3fbcfc/llms.txt): $0.02/call via x402. Returns all 7 diatonic triads and 7th chords for a given key (major, natural minor, or harmonic minor) with spelled notes, Roman numerals, and chord qualities.
- [Music Production Calc – Feedback Delay Tail Calculator](https://www.zero.xyz/c/music-production-calc-feedback-delay-tail-calculator-c7eff06d/llms.txt): $0.02/call via x402. Calculates dB lost per repeat, number of repeats to fall a target dB, and total tail time in milliseconds from a delay time and feedback percentage.
- [Music Production Calc – Camelot Wheel Key Lookup](https://www.zero.xyz/c/music-production-calc-camelot-wheel-key-lookup-49bbd54b/llms.txt): $0.02/call via x402. Returns the Camelot wheel code for a musical key and its harmonically compatible keys, with optional two-key compatibility testing.

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

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