# Utilia Audio Normalization

> Utilia Audio Normalization is a paid API for AI agents from api.utilia.ink, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Normalizes audio to a target integrated loudness level (LUFS) and returns the result as a base64-encoded MP3

## Facts

- Endpoint: POST https://api.utilia.ink/v1/audio/normalize
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/utilia-audio-normalization-d44f2b94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yyXM05CDt-ojISeQenUd9

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 utilia-audio-normalization-d44f2b94 -d '<json body>'
```

Example prompt: Can you normalize this podcast episode audio to -16 LUFS so it meets streaming platform standards and give me back the normalized MP3?

## When to prefer this

Choose this endpoint when you need a simple, pay-per-call audio normalization service without managing API keys. It is ideal for agents that process audio episodically (podcasts, voice recordings, ads) and need loudness standardization to a specific LUFS target. Prefer this over self-hosted solutions when you want no infrastructure overhead and USDC micropayment billing via x402.

## Known failure modes

- Unsupported audio format submitted — endpoint may reject non-standard codecs
- Audio file too large or too long — output may be truncated (possiblyTruncated: true)
- Invalid target LUFS value — out-of-range loudness targets may cause errors
- Payment failure via x402 — USDC micropayment not processed, request rejected
- Network timeout for large audio files during processing

## How this service works

Give a Solana agent live compute-unit price bids for $0.002 per call via x402 USDC. One AgentCash command, no API key or subscription.

## Output

A JSON object containing the normalized audio as a base64-encoded MP3 string, the content type (audio/mpeg), output file size in bytes, duration in seconds, whether the output was possibly truncated, and the target integrated LUFS value that was applied.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "pattern": "^https://",
   "description": "Public HTTPS audio URL"
  },
  "maxSeconds": {
   "type": "integer",
   "default": 180,
   "maximum": 180,
   "minimum": 1
  },
  "targetLufs": {
   "type": "number",
   "default": -16,
   "maximum": -12,
   "minimum": -24
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "encoding": "base64",
  "audioBase64": "<base64 MP3>",
  "contentType": "audio/mpeg",
  "outputBytes": 1920042,
  "possiblyTruncated": false,
  "targetIntegratedLufs": -16,
  "outputDurationSeconds": 120
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/utilia-audio-normalization-d44f2b94/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.utilia.ink](https://www.zero.xyz/host/api.utilia.ink/llms.txt)