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Sift Audio Normalize
x402
Sift Audio Normalize is a paid API for AI agents from sift.srv1996466.hstgr.cloud, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-19).
Normalizes an audio file to a target integrated loudness (EBU R 128) and returns a loudness-corrected audio file in the chosen format
Price / call$0.02
Success—
StatusUnknown
How this service works
Normalise audio loudness to a broadcast or streaming target, file returned. Linear two-pass EBU R 128 loudness normalisation to a named target (ebu_r128, atsc_a85, ebu_r128_short, podcast, spotify, youtube, apple_music, amazon_music, deezer, aes_streaming, audiobook_acx) or custom lufs/true_peak. Returns the corrected file (wav, wav16, flac, mp3, m4a, opus) with before/after figures in X-Loudness-Report.
Output
A loudness-normalized audio file returned directly (binary), corrected to the specified integrated loudness (LUFS) and true peak ceiling using EBU R 128 processing, in the requested output format (wav, wav16, flac, mp3, m4a, or opus).
Example use cases
Podcast episode loudness prep
“Take this raw podcast recording at https://storage.example.com/raw_episode42.wav and normalize it to the standard podcast loudness target, output as an MP3 file so it's ready to publish.”
Broadcast TV audio compliance
“I need to bring this voice-over file at https://cdn.example.com/voiceover.wav into broadcast compliance — set it to -23 LUFS with a true peak of -3 dBTP and return a WAV file.”
Spotify streaming loudness match
“Normalize this music track at https://files.example.com/track.flac to -14 LUFS with a true peak of -1 dBTP and give me a FLAC back so it sounds right on Spotify.”
Technical details
Endpoint
GEThttps://sift.srv1996466.hstgr.cloud/v1/audio/normalize?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need EBU R 128 integrated loudness normalization applied to an existing audio file accessible via URL, especially for podcast, streaming (Spotify, YouTube, Apple Podcasts), or broadcast delivery targets. It supports fine-grained control over LUFS and true peak values and multiple output formats. Prefer it over generic audio converters when loudness compliance to a named or custom target is the primary requirement.
Side effects
- Audio file URL is unreachable or returns non-200 — endpoint returns an error and no charge is made
- Unsupported audio format at the source URL — processing fails with format error
- LUFS value outside -40 to -5 range — validation error
- True peak value outside -9 to 0 dBTP range — validation error
- Unknown named target profile — returns parameter error
- Source file too large or too long — may time out or return processing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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