{"uid":"cap_jM2XvOkmfFb9ZpHYQaBUK","slug":"x402-agentutility-ai-audio-loudness-normalizer-2eb0df7e","name":"x402.agentutility.ai Audio Loudness Normalizer","description":"Normalize audio loudness to a target LUFS level for podcasts, YouTube, and Spotify delivery. Send an audio_url plus an optional target_lufs (defaults to -16) and true_peak, and it probes duration, runs two-pass EBU R128 loudness normalization, and returns a hosted MP3 URL with the applied target and duration in seconds. Common presets: -23 for broadcast, -16 for podcasts, -14 for streaming platforms. Use it as a loudness normalizer, LUFS correction API, or audio mastering step before publishing.","url":"https://x402.agentutility.ai/audio-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":{"required":["audio_url"],"properties":{"audio_url":{"type":"string","description":"URL of the audio file to normalize. Rejected if longer than 60 minutes."},"true_peak":{"type":"number","description":"Default -1.5. Range -9 to 0."},"target_lufs":{"type":"number","description":"Default -16. Range -30 to -10."}}},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"audio_url":{"type":"string"},"target_lufs":{"type":"integer"},"duration_seconds":{"type":"integer"}}}}}}},"responseSchema":{"type":"json","example":{"audio_url":"https://...mp3","target_lufs":-16,"duration_seconds":120}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/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_e3u43TEIVX5_uBIhWYwdo","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Normalizes audio loudness to a target LUFS level (EBU R128) for podcast, YouTube, or streaming delivery, returning a hosted MP3 URL","exampleAgentPrompt":"Can you normalize the loudness of this podcast episode — https://example.com/episode42.mp3 — to -16 LUFS with a true peak of -1.5, so it's ready for podcast distribution?","exampleUseCases":[{"title":"Podcast episode loudness correction","prompt":"I just recorded my podcast episode and it sounds too quiet in some places. Can you normalize the loudness of https://cdn.mypodcast.com/ep10.mp3 to -16 LUFS so it's ready to upload to Spotify and Apple Podcasts?"},{"title":"Broadcast-standard audio delivery","prompt":"I need this interview recording at https://media.mystation.com/interview-raw.mp3 normalized to broadcast standard — -23 LUFS with a true peak of -1.5 — before it goes to air."},{"title":"YouTube video audio mastering","prompt":"Before I upload my YouTube video, can you fix the loudness on the audio track at https://assets.mysite.com/video-audio.mp3? Target -14 LUFS with a true peak of -1.0 for streaming."}],"resultDescription":"Returns a JSON object with a hosted MP3 URL pointing to the loudness-normalized audio file, the applied target_lufs value used, and the duration of the audio in seconds.","failureModes":["Audio file longer than 60 minutes is rejected","Invalid or inaccessible audio_url returns an error","target_lufs out of range (-30 to -10) returns a validation error","true_peak out of range (-9 to 0) returns a validation error","Network timeout if source audio file is very large or slow to download","Unsupported audio format may cause processing failure"],"whenToPreferThis":"Choose this endpoint when you need a simple, pay-per-call API to normalize audio loudness to a specific LUFS target before publishing to podcasts, streaming platforms, or broadcast. It handles the full EBU R128 two-pass normalization pipeline and returns a ready-to-use hosted MP3, making it ideal for automated publishing workflows without managing your own ffmpeg infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T12:04:48.872Z","isFirstParty":false}