{"uid":"cap_Uutc48BaPjfMMdOHsb0RL","slug":"sift-audio-normalize-89ac9aa7","name":"Sift Audio Normalize","description":"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.","url":"https://sift.srv1996466.hstgr.cloud/v1/audio/normalize?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"Audio file URL"},"lufs":{"type":"number","description":"Custom integrated loudness, -40 to -5"},"format":{"type":"string","description":"wav, wav16, flac, mp3, m4a or opus (default mp3)"},"target":{"type":"string","description":"Named target (default podcast)"},"true_peak":{"type":"number","description":"Custom true peak dBTP, -9 to 0"}}}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rEPBgSMMhGr0v0kqb9KkK","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Normalizes an audio file to a target integrated loudness (EBU R 128) and returns a loudness-corrected audio file in the chosen format","exampleAgentPrompt":"Can you normalize the audio at https://example.com/episode.mp3 to -16 LUFS with a true peak of -1 dBTP and give me an MP3 back — I need it ready for podcast distribution.","exampleUseCases":[{"title":"Podcast episode loudness prep","prompt":"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."},{"title":"Broadcast TV audio compliance","prompt":"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."},{"title":"Spotify streaming loudness match","prompt":"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."}],"resultDescription":"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).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T18:36:37.842Z","isFirstParty":false,"canonicalSlug":"sift-audio-normalize-89ac9aa7"}