# Services from audio-calc.x402tookit.com on Zero

> audio-calc.x402tookit.com serves 12 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/audio-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/audio-calc.x402tookit.com/health.json

## Services

- [Audio Calc – Interval Ratio Converter](https://www.zero.xyz/c/audio-calc-interval-ratio-converter-58df4e1a/llms.txt): $0.02/call via x402. Converts a frequency ratio or cent value to cents, semitones, and octaves, names the just/Pythagorean interval, and optionally applies the interval to a base frequency in Hz.
- [Audio Calc: Tuning Temperament Frequencies](https://www.zero.xyz/c/audio-calc-tuning-temperament-frequencies-a082b001/llms.txt): $0.02/call via x402. Returns frequencies, cents, and ratios for all 12 chromatic notes in equal, 5-limit just, Pythagorean, or quarter-comma meantone tuning, relative to a specified root and A4 reference pitch.
- [Audio Calc: Bitrate & File Size Calculator](https://www.zero.xyz/c/audio-calc-bitrate-file-size-calculator-be781721/llms.txt): $0.02/call via x402. Calculates audio file size from bitrate and duration, solves for missing bitrate or duration given file size, and computes PCM file size from sample rate, bit depth, and channels.
- [Audio Calc: Buffer Size to Latency Converter](https://www.zero.xyz/c/audio-calc-buffer-size-to-latency-converter-7d04dc47/llms.txt): $0.02/call via x402. Converts audio buffer size (in samples) to one-way and round-trip latency in milliseconds at a given sample rate, or finds the buffer size needed to meet a latency target.
- [Audio Calc: dB Level Summation & Background Subtraction](https://www.zero.xyz/c/audio-calc-db-level-summation-background-subtraction-254820ad/llms.txt): $0.02/call via x402. Calculates the combined, averaged, or background-corrected sound level in dB from multiple sources or identical sources.
- [Audio Calc – dBFS & Linear Amplitude Converter](https://www.zero.xyz/c/audio-calc-dbfs-linear-amplitude-converter-ec5063b3/llms.txt): $0.02/call via x402. Converts between linear amplitude and dBFS, and computes RMS level, crest factor, and headroom for sine, square, triangle, or sawtooth waveforms.
- [Audio Calc LUFS Math](https://www.zero.xyz/c/audio-calc-lufs-math-636c0866/llms.txt): $0.02/call via x402. Calculates loudness gain adjustments to hit a LUFS target or streaming platform standard, predicts true peak after gain, and combines segment loudness values.
- [Audio Calc: Nyquist Frequency & Aliasing Calculator](https://www.zero.xyz/c/audio-calc-nyquist-frequency-aliasing-calculator-c43bce32/llms.txt): $0.02/call via x402. Calculates the Nyquist frequency for a given sample rate, plus optional tone aliasing analysis (alias frequency, samples per cycle, below-Nyquist status) and the guard band above 20 kHz.
- [Audio Calc – PCM Bit Depth Calculator](https://www.zero.xyz/c/audio-calc-pcm-bit-depth-calculator-f5377aad/llms.txt): $0.02/call via x402. Calculates dynamic range, quantization levels, LSB step size, theoretical SNR, and required bit depth for a given PCM bit depth or dB range
- [Audio Calc – Room Mode Frequencies](https://www.zero.xyz/c/audio-calc-room-mode-frequencies-d31b4b21/llms.txt): $0.02/call via x402. Calculates axial, tangential, and oblique room mode frequencies for a rectangular room, plus the Schroeder frequency derived from RT60.
- [Audio Calc: Sound Wavelength & Speed Calculator](https://www.zero.xyz/c/audio-calc-sound-wavelength-speed-calculator-d99742bb/llms.txt): $0.02/call via x402. Calculates speed of sound, wavelength, period, and delay-per-metre for audio frequencies at a given air temperature, with bidirectional frequency/wavelength/delay/distance conversions.
- [Audio Calc SPL Distance](https://www.zero.xyz/c/audio-calc-spl-distance-af7c590f/llms.txt): $0.02/call via x402. Calculates sound pressure level at a new distance or finds the distance for a target dB level using the inverse-square law (6 dB per doubling for point sources, 3 dB per doubling for line sources).

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

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