# Services from audio.halowerk.com on Zero

> audio.halowerk.com serves 10 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.halowerk.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/audio.halowerk.com/health.json

## Services

- [audio.halowerk.com Audio Converter](https://www.zero.xyz/c/audio-halowerk-com-audio-converter-0dae2f88/llms.txt): $0.006/call via x402. Converts audio files to FLAC, WAV (16/24-bit), MP3, Opus, or AAC with configurable sample rate, channel count, and quality, while measuring the source's spectral cutoff to detect prior lossy encoding before conversion.
- [HALOWERK audiowerk Duck (Voice Ducking / Sidechain Compression)](https://www.zero.xyz/c/halowerk-audiowerk-duck-voice-ducking-sidechain-compression-42726295/llms.txt): $0.01/call via x402. Mixes a voice track over a music bed with automatic ducking — the music volume is pulled down when the voice is detected and restored when it stops.
- [HALOWERK German Dialect Classifier](https://www.zero.xyz/c/halowerk-german-dialect-classifier-470c67e3/llms.txt): $0.006/call via x402. Classifies a German-language audio recording into one of three regional varieties (de-DE, de-AT, de-CH) using acoustic speech embeddings, returning probabilities and confidence signals.
- [audio.halowerk.com Silence Trimmer](https://www.zero.xyz/c/audio-halowerk-com-silence-trimmer-47049975/llms.txt): $0.008/call via x402. Detects and shortens silent stretches in audio files using ffmpeg level detection, reducing pauses that exceed a threshold while preserving a configurable minimum floor (default 400ms) to avoid unnatural sentence collisions
- [Halowerk Audio Loudness Normaliser](https://www.zero.xyz/c/halowerk-audio-loudness-normaliser-aace4052/llms.txt): $0.008/call via x402. Normalises audio loudness to a target LUFS level (default −14 LUFS) using a two-pass measurement-and-correction process, with presets for streaming, podcast, and broadcast standards.
- [HALOWERK audiowerk Speech Rate Analyzer](https://www.zero.xyz/c/halowerk-audiowerk-speech-rate-analyzer-89b04249/llms.txt): $0.008/call via x402. Measures the speaking rate and pause patterns of an audio recording, with optional transcript and segment timings
- [HALOWERK audiowerk Speech Duration Estimator](https://www.zero.xyz/c/halowerk-audiowerk-speech-duration-estimator-e6fc55fa/llms.txt): $0.002/call via x402. Estimates the duration of spoken audio for a given text, delivery style, language, and pause settings without generating the audio itself.
- [Halowerk Ad Slot Auction](https://www.zero.xyz/c/halowerk-ad-slot-auction-5d7d644b/llms.txt): $0.004/call via x402. Manages sealed-bid audio ad slot auctions: create slots with reserve price and closing time, place bids checked against reserve and publisher rules, and track rejected bids with reasons.
- [HALOWERK audiowerk Voice Evidence Analyzer](https://www.zero.xyz/c/halowerk-audiowerk-voice-evidence-analyzer-074d92f5/llms.txt): $0.006/call via x402. Analyzes an audio recording to extract acoustic evidence metadata including room tone, pause detection, and silence characterization.
- [HALOWERK audiowerk Voice Spectrum Analyzer](https://www.zero.xyz/c/halowerk-audiowerk-voice-spectrum-analyzer-4de62230/llms.txt): $0.006/call via x402. Analyzes an audio recording and returns its voice frequency spectrum, with optional per-frequency power data at 128 probe points for plotting.

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)