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Halowerk Audio Loudness Normaliser
x402
Halowerk Audio Loudness Normaliser is a paid API for AI agents from audio.halowerk.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).
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.
Price / call$0.008
Success—
StatusUnknown
How this service works
Normalises to −14 LUFS by default, the level the streaming platforms converged on, with named presets for podcast, European and United States broadcast, or a free target. The correction runs in two passes: the first measures integrated loudness, true peak, loudness range and threshold, the second applies a constant correction derived from those figures.
Output
Returns a loudness-normalised audio file along with measurements from the analysis pass: integrated loudness (LUFS), true peak level, loudness range (LU), and the constant correction gain applied. The output file conforms to the requested loudness target or preset.
Example use cases
Podcast episode pre-upload normalisation
“I've finished recording my podcast episode and need to normalise it to −14 LUFS using the podcast preset before I upload it to Spotify — can you run it through the loudness normaliser?”
Music track streaming compliance
“Normalise this music track to −14 LUFS so it meets streaming platform standards — run the full two-pass correction and tell me what the measured integrated loudness was before and after.”
European broadcast loudness compliance
“I need to submit this audio file to a European broadcaster — can you normalise it to meet the EBU R128 European broadcast standard using the European broadcast preset?”
Technical details
Endpoint
POSThttps://audio.halowerk.com/loudness-normaliseWhen to prefer
Choose this endpoint when you need standards-compliant loudness normalisation for streaming platforms (−14 LUFS), podcast distribution, or broadcast delivery (EBU R128 European or ATSC A/85 US). It is a dedicated two-pass loudness processor that measures integrated loudness, true peak, and loudness range before applying a precise correction — superior to single-pass or peak-only normalisation. Prefer it over generic audio conversion tools when loudness compliance is the primary requirement.
Side effects
- Unsupported audio format or codec returns a format error
- Audio file too short or silent to measure integrated loudness accurately
- Custom LUFS target out of acceptable range returns a validation error
- True peak limiting may cause distortion if source is heavily clipped
- Network timeout on large audio files during two-pass processing
- Payment authentication failure via x402 returns 402 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| audio | object | The recording. Either url or content_base64. |
| target | string | Named target. streaming is -14 LUFS. |
| target_lufs | number | Integrated loudness target, only with target=custom. |
| true_peak_db | number | True peak ceiling in dBTP, only with target=custom. |
| output_format | string | Format of the normalised file. |
| loudness_range_lu | number | Loudness range target, only with target=custom. |
Tags
x402
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