{"uid":"cap_0C63q2NUGvr9qHsGEk4PN","slug":"relaystation-audio-loudness-normalizer-ebu-r128-019e59e5","name":"RelayStation Audio Loudness Normalizer (EBU R128)","description":"$0.0005/MB. Normalize audio loudness to broadcast EBU R128 — LUFS, true-peak, and range targets. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny","url":"https://api.relaystation.ai/v1/media/loudnorm","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","properties":{"i":{"type":"number","maximum":-5,"minimum":-70},"tp":{"type":"number","maximum":0,"minimum":-9},"ext":{"enum":["mp3","m4a","aac","wav","ogg","flac"],"type":"string"},"lra":{"type":"number","maximum":50,"minimum":1},"file":{"type":"object","description":"cputools input-source: { inline: <base64 ≤ 4 MiB> } or { inputKey: <scratch key ≤ 50 MB> }. The input container must sniff (ffprobe) to the live allowlist (operator-tunable cputools.media.input_formats): 3g2, 3gp, aac, asf, avi, flac, flv, gif, m4a, m4v, matroska, mj2, mov, mov,mp4,m4a,3gp,3g2,mj2, mp3, mp4, mpeg, mpegts, mpegvideo, ogg, wav, webm, wmv. An off-list input is a free 422 UNSUPPORTED_FORMAT."}}},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_K492tODSi-WPRq40uTflj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Normalizes audio file loudness to broadcast-standard EBU R128 targets, adjusting integrated loudness (LUFS), true-peak, and loudness range (LRA).","exampleAgentPrompt":"Can you normalize the loudness of this podcast episode (attached WAV file) to -23 LUFS integrated with a true-peak of -1 dBTP and loudness range of 7 LU, and give me back an MP3?","exampleUseCases":[{"title":"Podcast broadcast loudness compliance","prompt":"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."},{"title":"Film dialogue loudness mastering","prompt":"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."},{"title":"Music streaming loudness prep","prompt":"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)."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:53:37.354Z","isFirstParty":false}