# HALOWERK audiowerk Voice Spectrum Analyzer

> HALOWERK audiowerk Voice Spectrum Analyzer is a paid API for AI agents from audio.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-13).

Analyzes an audio recording and returns its voice frequency spectrum, with optional per-frequency power data at 128 probe points for plotting.

## Facts

- Endpoint: POST https://audio.halowerk.com/voice-spectrum
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-audiowerk-voice-spectrum-analyzer-4de62230
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wXmyG6WqpW5lrhOp9zFim

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 halowerk-audiowerk-voice-spectrum-analyzer-4de62230 -d '<json body>'
```

Example prompt: Analyze the voice spectrum of this recording for me — here's the audio URL: https://example.com/interview.mp3 — and include the full 128-frequency power breakdown so I can plot it.

## When to prefer this

Choose this endpoint when you need detailed spectral analysis of a voice or audio recording, especially for diagnostics, vocal profiling, EQ assessment, or plotting frequency response curves. It is purpose-built for voice spectrum extraction rather than general audio metadata or transcription.

## Known failure modes

- Audio URL is not publicly accessible or returns a non-200 response — request fails with an error
- Base64 content exceeds 12MB limit — rejected with payload-too-large error
- Neither url nor content_base64 is provided — missing required field error
- Audio format is unsupported or corrupted — processing error returned
- Payment not provided or insufficient — HTTP 402 payment required response

## How this service works

HALOWERK audiowerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

## Output

Returns the voice frequency spectrum of the submitted audio. When detail=true, also includes power measurements at all 128 probe frequencies suitable for plotting a full spectral curve of the voice.

## 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
  },
  "detail": {
   "type": "boolean",
   "default": false,
   "description": "Also return the power at all 128 probe frequencies, for plotting."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-audiowerk-voice-spectrum-analyzer-4de62230/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)