# audio.halowerk.com Audio Converter

> audio.halowerk.com Audio Converter is a paid API for AI agents from audio.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-10).

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.

## Facts

- Endpoint: POST https://audio.halowerk.com/convert?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/audio-halowerk-com-audio-converter-0dae2f88
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HPbpHWtmC48YJz-E61sUU

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

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability audio-halowerk-com-audio-converter-0dae2f88 -d '<json body>'
```

Example prompt: Convert this audio file to 24-bit FLAC at 48 kHz stereo, and let me know if the source was already lossy before converting — I want to know if wrapping it in FLAC will actually gain me anything.

## When to prefer this

Choose this endpoint when you need not just a format conversion but an honest assessment of whether conversion will be meaningful — particularly when converting from potentially lossy sources to lossless containers. It is especially valuable when archiving audio of unknown provenance, where blindly converting MP3 to FLAC would waste storage without restoring quality. Prefer it over bare transcoding tools when the spectral verdict matters for decision-making.

## Known failure modes

- Unsupported or corrupt input audio file returns an error
- Requested format/bit-depth combination not supported
- Source spectral analysis inconclusive for highly processed audio
- Network timeout on large audio files
- Invalid quality or sample rate parameter values

## How this service works

Converts to FLAC, WAV at 16 or 24 bit, MP3, Opus or AAC, with sample rate, channel count and quality all settable and all reported back. What separates this from a bare transcode is the verdict on what the conversion actually did. The spectral cut-off of the source is measured first, so a source that already passed through a lossy stage is recognised before it is wrapped in a lossless container: converting an MP3 to FLAC multiplies the file size by roughly ten and restores nothing, and the…

## Output

Returns the converted audio file along with a report including the detected spectral cutoff of the source audio, a verdict on whether prior lossy encoding was detected, and the confirmed output format parameters (format, bit depth, sample rate, channel count).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "audio": {
   "type": "object",
   "properties": {
    "url": {
     "type": "string",
     "maxLength": 2048,
     "description": "Public http(s) URL."
    },
    "content_base64": {
     "type": "string",
     "maxLength": 12000000,
     "description": "The file inline, base64."
    }
   },
   "description": "The recording. Either url or content_base64.",
   "additionalProperties": false
  },
  "channels": {
   "enum": [
    1,
    2
   ],
   "type": "integer",
   "description": "Target channel count. Left out, the source layout is kept. Downmixing to mono is irreversible."
  },
  "sample_rate": {
   "enum": [
    8000,
    16000,
    22050,
    24000,
    32000,
    44100,
    48000,
    96000
   ],
   "type": "integer",
   "description": "Target sample rate. Left out, the source rate is kept."
  },
  "bitrate_kbps": {
   "type": "integer",
   "maximum": 320,
   "minimum": 32,
   "description": "Bit rate for the lossy targets. Ignored for flac and wav."
  },
  "target_format": {
   "enum": [
    "flac",
    "wav",
    "wav24",
    "mp3",
    "opus",
    "aac"
   ],
   "type": "string",
   "description": "Target format. flac, wav and wav24 are lossless containers; mp3, opus and aac are not."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/audio-halowerk-com-audio-converter-0dae2f88/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from audio.halowerk.com](https://www.zero.xyz/host/audio.halowerk.com/llms.txt)