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Audio Loudnorm

by AgentUtility.ai in News & content

x402 APIPassing, checked 15 min ago

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.

POST https://x402.agentutility.ai/audio-loudnorm

Last 30 days

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Uptime
83.3%
Response time
188 ms typical, 3.0 s slowest 5%
Last check
15 min ago
Next check
in 17 min

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://x402.agentutility.ai/audio-loudnorm" \
  -H "content-type: application/json" \
  -d '{"audio_url":"https://download.samplelib.com/mp3/sample-3s.mp3","target_lufs":-16}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402.agentutility.ai%2Faudio-loudnorm
const res = await pay("https://x402.agentutility.ai/audio-loudnorm", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"audio_url":"https://download.samplelib.com/mp3/sample-3s.mp3","target_lufs":-16}),
});
console.log(await res.json());

Example input

{
  "audio_url": "https://download.samplelib.com/mp3/sample-3s.mp3",
  "target_lufs": -16
}

Example output

{
  "audio_url": "https://...mp3",
  "duration_seconds": 120,
  "target_lufs": -16
}

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