cURL

# A complete program that also waits for the result and downloads it:
# https://docs.soundpiece.co/guides/adapt/auto_cut_down

# One key per job: keep it, and send the same key if you retry.
IDEMPOTENCY_KEY=$(uuidgen)

curl --request PUT \
  --url https://api.soundpiece.co/v1/adapt.auto_cut_down \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "idempotency_key": "$IDEMPOTENCY_KEY",
  "source": {
    "url": "https://example.com/audio/song.mp3"
  },
  "target_duration": 30.0
}
EOF

# A complete program that also waits for the result and downloads it:
# https://docs.soundpiece.co/guides/adapt/auto_cut_down

import uuid

import requests

url = "https://api.soundpiece.co/v1/adapt.auto_cut_down"

# One key per job: keep it, and send the same key if you retry.
idempotency_key = str(uuid.uuid4())

payload = {
    "idempotency_key": idempotency_key,
    "source": {
        "url": "https://example.com/audio/song.mp3",
    },
    "target_duration": 30.0,
}
headers = {"Authorization": "Bearer <token>"}

response = requests.put(url, json=payload, headers=headers, timeout=30)

print(response.json())

// A complete program that also waits for the result and downloads it:
// https://docs.soundpiece.co/guides/adapt/auto_cut_down

import { randomUUID } from "node:crypto";

// One key per job: keep it, and send the same key if you retry.
const idempotencyKey = randomUUID();

const response = await fetch("https://api.soundpiece.co/v1/adapt.auto_cut_down", {
  method: "PUT",
  headers: {Authorization: "Bearer <token>", "Content-Type": "application/json"},
  body: JSON.stringify({
    idempotency_key: idempotencyKey,
    source: {
      url: "https://example.com/audio/song.mp3",
    },
    target_duration: 30.0,
  }),
});

console.log(await response.json());

{
  "auto_cut": {
    "id": "op_01m3vcs7e0f8rsq32d5sqhmetw",
    "status": "processing",
    "created_at": "2026-10-01T09:30:00Z",
    "idempotency_key": "3f2b8c1e-9d4a-4e7b-b6c5-1a2d3e4f5a6b",
    "target_duration": 15,
    "loudness": {
      "target_lufs": -14,
      "allow_compression": true
    },
    "output": null,
    "error": null
  }
}

Adapt

adapt.auto_cut_down (submit)

Submit an auto-cut request.

Returns immediately with status: processing. Use the matching GET to poll for completion, or supply a callback_url to receive a webhook.

Auto-cut trims a longer audio source to a target duration, choosing musically natural cut points. The output duration may be slightly shorter or longer than target_duration to land on a natural boundary.

target_duration is a target, not an exact length. Its absolute bounds — at least 5 seconds and at most 5 minutes — are checked up front (422). It must also be at most twice the source duration; since the source duration is only known after ingestion, exceeding that surfaces asynchronously as a failed operation with target_duration_too_long. The source must be fetchable, decodable audio within the supported format/size limits and at least 2.5 seconds long (half the minimum target), else a source_* error — validated once the source is fetched and decoded (see errors).

Add the optional loudness block to have the cut normalised to a target integrated loudness, given in LUFS or as a named preset (streaming, podcast or broadcast), at no extra cost — see loudness.

Credits cost: 1 per request. Insufficient credits returns 402 — see errors.

PUT

adapt.auto_cut_down

cURL

# A complete program that also waits for the result and downloads it:
# https://docs.soundpiece.co/guides/adapt/auto_cut_down

# One key per job: keep it, and send the same key if you retry.
IDEMPOTENCY_KEY=$(uuidgen)

curl --request PUT \
  --url https://api.soundpiece.co/v1/adapt.auto_cut_down \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "idempotency_key": "$IDEMPOTENCY_KEY",
  "source": {
    "url": "https://example.com/audio/song.mp3"
  },
  "target_duration": 30.0
}
EOF

# A complete program that also waits for the result and downloads it:
# https://docs.soundpiece.co/guides/adapt/auto_cut_down

import uuid

import requests

url = "https://api.soundpiece.co/v1/adapt.auto_cut_down"

# One key per job: keep it, and send the same key if you retry.
idempotency_key = str(uuid.uuid4())

payload = {
    "idempotency_key": idempotency_key,
    "source": {
        "url": "https://example.com/audio/song.mp3",
    },
    "target_duration": 30.0,
}
headers = {"Authorization": "Bearer <token>"}

response = requests.put(url, json=payload, headers=headers, timeout=30)

print(response.json())

// A complete program that also waits for the result and downloads it:
// https://docs.soundpiece.co/guides/adapt/auto_cut_down

import { randomUUID } from "node:crypto";

// One key per job: keep it, and send the same key if you retry.
const idempotencyKey = randomUUID();

const response = await fetch("https://api.soundpiece.co/v1/adapt.auto_cut_down", {
  method: "PUT",
  headers: {Authorization: "Bearer <token>", "Content-Type": "application/json"},
  body: JSON.stringify({
    idempotency_key: idempotencyKey,
    source: {
      url: "https://example.com/audio/song.mp3",
    },
    target_duration: 30.0,
  }),
});

console.log(await response.json());

{
  "auto_cut": {
    "id": "op_01m3vcs7e0f8rsq32d5sqhmetw",
    "status": "processing",
    "created_at": "2026-10-01T09:30:00Z",
    "idempotency_key": "3f2b8c1e-9d4a-4e7b-b6c5-1a2d3e4f5a6b",
    "target_duration": 15,
    "loudness": {
      "target_lufs": -14,
      "allow_compression": true
    },
    "output": null,
    "error": null
  }
}

Authorizations

Authorization

string

header

required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Body

application/json

idempotency_key

string<uuid>

required

A unique UUID you choose. Send the same key to retry safely; we'll return the original response without doing the work again.

Example:

"3f2b8c1e-9d4a-4e7b-b6c5-1a2d3e4f5a6b"

source

AudioSource · object

required

The audio source to operate on.

Show child attributes

target_duration

number

required

The desired output duration in seconds. This is a target, not an exact length — the result may be slightly shorter or longer to land on a natural cut point. Must be between 5 seconds and 5 minutes (enforced up front; out of range is a 422), and at most twice the source duration. Because the source duration is only known after the source is fetched and decoded, exceeding twice the source surfaces asynchronously as a failed operation with target_duration_too_long. See errors.

Required range: 5 <= x <= 300

callback_url

string<uri> | null

Optional HTTPS URL we'll POST the final response to when the operation reaches ready or failed. Polling remains the canonical source of truth; webhooks are a best-effort latency optimisation.

Required string length: 1 - 2048

Example:

"https://example.com/webhooks/soundpiece"

loudness

Target · object

A target loudness to normalise audio to. Every field has a default, so {} asks for the defaults: -14 LUFS, compression allowed.

Target
Preset

Show child attributes

Response

Successful Response

auto_cut

AutoCut · object

required

Show child attributes