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RelayStation Audio Loudness Normalizer (EBU R128)
x402
RelayStation Audio Loudness Normalizer (EBU R128) is a paid API for AI agents from api.relaystation.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Normalizes audio file loudness to broadcast-standard EBU R128 targets, adjusting integrated loudness (LUFS), true-peak, and loudness range (LRA).
Price / call$0.01
Success—
StatusUnknown
How this service works
$0.0005/MB. Normalize audio loudness to broadcast EBU R128 — LUFS, true-peak, and range targets. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny
Output
Returns a loudness-normalized audio file in the requested output format (mp3, m4a, aac, wav, ogg, or flac), with integrated loudness, true-peak, and loudness range adjusted to the specified EBU R128 targets.
Example use cases
Podcast broadcast loudness compliance
“I have a raw podcast recording as a WAV file — can you normalize it to -16 LUFS integrated, -1 dBTP true-peak, and an LRA of 10 LU so it meets Spotify's loudness requirements? Output it as an MP3.”
Film dialogue loudness mastering
“This voice-over track is way too hot — normalize it to -23 LUFS with a true-peak of -2 dBTP and LRA of 15 LU for broadcast TV compliance, and return it as a WAV file.”
Music streaming loudness prep
“Can you take this FLAC album track and normalize it to -14 LUFS integrated with a -1 true-peak ceiling and LRA of 9 LU so it's ready for Apple Music or Tidal? Output as AAC (m4a).”
Technical details
Endpoint
POSThttps://api.relaystation.ai/v1/media/loudnormWhen to prefer
Choose this endpoint when you need standards-compliant EBU R128 loudness normalization for broadcast, streaming, or podcast delivery, particularly when precise LUFS, true-peak, and LRA targets are required. Prefer it over general-purpose ffmpeg wrappers or audio conversion tools when loudness compliance (not just format conversion) is the goal.
Side effects
- Unsupported input container format (422 UNSUPPORTED_FORMAT — free, no charge)
- File too large (inline base64 limited to 4 MiB, scratch key up to 50 MB)
- Target values out of range (i must be between -70 and -5 LUFS, tp between -9 and 0, lra between 1 and 50)
- Corrupted or unreadable audio file causing ffprobe failure
- Invalid output extension enum value
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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