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Utilia Audio Normalization
x402
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 2026-10-13).
Normalize audio (from a public HTTPS URL or base64) to a target integrated loudness (LUFS) and return a base64-encoded MP3 with loudness measurements and content digests.
Price / call$0.01
Success—
StatusDown
How this service works
Normalize public HTTPS or base64 audio to a predictable integrated loudness and return a bounded base64 MP3 with measurements and content digests.
Output
A bounded base64-encoded MP3 of the normalized audio, along with loudness measurements including integrated loudness (LUFS), loudness range (LU), true peak (dBTP), and content digests (e.g. SHA hash) for integrity verification.
Example use cases
Podcast episode loudness standardization
“I have a podcast episode at this URL: https://cdn.mypodcast.com/ep42.mp3 — can you normalize it to -16 LUFS so it meets Spotify and Apple Podcasts standards, and return the normalized MP3 with the loudness readings?”
Music production loudness metering
“Before I upload this track, can you normalize it to -14 LUFS integrated and tell me the true peak and loudness range? The audio is at https://storage.example.com/track-final.wav”
User-generated audio quality control
“We have a user-submitted voice recording encoded in base64 — can you normalize it to -23 LUFS (EBU R128 standard) and give me back the normalized base64 MP3 with its loudness measurements so I can verify it meets our platform specs?”
Technical details
Endpoint
POSThttps://api.utilia.ink/base/v1/audio/normalize?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need deterministic, standards-compliant loudness normalization (LUFS-based) with verifiable output digests. Prefer it over generic audio processing services when you need broadcast/streaming compliance (e.g. EBU R128, ATSC A/85), need the normalized audio returned as a base64 MP3 in a single API call, or require loudness measurements alongside the processed file. The pay-per-call x402 pricing model makes it suitable for on-demand agent workflows without subscription overhead.
Side effects
- Invalid or unreachable HTTPS URL returns an error
- Malformed or corrupted base64 audio input fails processing
- Unsupported audio format or codec may cause conversion failure
- Audio file exceeds size or duration limits
- Network timeout when fetching remote audio URL
- Invalid target loudness parameter (out of accepted range)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTPS audio URL |
| maxSeconds | integer | |
| targetLufs | number |
Output
Schema · Response
{
"type": "json",
"example": {
"encoding": "base64",
"audioBase64": "<base64 MP3>",
"contentType": "audio/mpeg",
"outputBytes": 1920042,
"possiblyTruncated": false,
"targetIntegratedLufs": -16,
"outputDurationSeconds": 120
}
}Tags
x402
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