Mastering B2B API

Authenticate requests with your API key. Each song submission costs 25 credits ($0.50).

Mastered files are delivered via our CloudFront CDN and remain available for 30 days. Make sure to download any files you need to keep beyond that period.

1. Upload to Chosen Masters

Request a signed URL from our API and upload the file to our secure bucket.

const res = await fetch('https://chosenmasters.com/api/get-signed-url', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ fileName: 'file.wav', fileType: 'audio/wav' })
});
const { signedUrl, s3Key } = await res.json();
// PUT your file to signedUrl

2. Submit for Mastering

// submit track for mastering
const res = await fetch('https://chosenmasters.com/api/b2b/mastering', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': API_KEY
  },
  body: JSON.stringify({
    s3Key: 'path/to/file.wav',
    title: 'My Track',
    ext: 'wav',
    size: '5.4',
    mode: 'process' // process | lite | warm

  })
});
const data = await res.json();
console.log(data.jobId);

Optional mode values: process (Modern), lite (Open), orwarm (Powerful). Defaults to process.

3. Retrieve Mastered File

// check mastering status or download mastered file
const res = await fetch('https://chosenmasters.com/api/b2b/mastering/' + jobId, {
  headers: { 'x-api-key': API_KEY }
});
const data = await res.json();
console.log(data);