Create Audio Asset

Upload an audio file to an existing asset group. The returned Asset ID can be referenced as asset://<ID> in Seedance 2.0 requests for background music, reference audio, and similar scenarios. Supports wav/mp3 format, ≤15 MB. Audio asset activation is typically 3–6 seconds in ideal conditions. Actual timing may vary with file size and review queue load; during congestion, activation may take about 10 seconds to 2 minutes. CreateAsset is asynchronous; system processing may queue the asset, and upload-time SLA is not guaranteed. Poll GetAsset after creation and use the asset only after Status becomes Active; Failed means preprocessing failed and the asset cannot be used. In generation requests, reference the asset as asset://<ID> instead of using the temporary GetAsset URL.

POST /volc/asset/CreateAsset

cURL

cURL

curl https://www.anyfast.ai/volc/asset/CreateAsset \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "volc-asset-audio",
  "GroupId": "group-20260319072926-rrnmg",
  "Name": "background-music",
  "AssetType": "Audio",
  "URL": "https://example.com/audio.mp3"
}'

import requests

url = "https://www.anyfast.ai/volc/asset/CreateAsset"

payload = {
    "GroupId": "group-20260319072926-rrnmg",
    "AssetType": "Audio",
    "URL": "https://example.com/audio.mp3",
    "model": "volc-asset-audio",
    "Name": "background-music"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    GroupId: 'group-20260319072926-rrnmg',
    AssetType: 'Audio',
    URL: 'https://example.com/audio.mp3',
    model: 'volc-asset-audio',
    Name: 'background-music'
  })
};

fetch('https://www.anyfast.ai/volc/asset/CreateAsset', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://www.anyfast.ai/volc/asset/CreateAsset",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'GroupId' => 'group-20260319072926-rrnmg',
    'AssetType' => 'Audio',
    'URL' => 'https://example.com/audio.mp3',
    'model' => 'volc-asset-audio',
    'Name' => 'background-music'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://www.anyfast.ai/volc/asset/CreateAsset"

	payload := strings.NewReader("{\n  \"GroupId\": \"group-20260319072926-rrnmg\",\n  \"AssetType\": \"Audio\",\n  \"URL\": \"https://example.com/audio.mp3\",\n  \"model\": \"volc-asset-audio\",\n  \"Name\": \"background-music\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://www.anyfast.ai/volc/asset/CreateAsset")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"GroupId\": \"group-20260319072926-rrnmg\",\n  \"AssetType\": \"Audio\",\n  \"URL\": \"https://example.com/audio.mp3\",\n  \"model\": \"volc-asset-audio\",\n  \"Name\": \"background-music\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://www.anyfast.ai/volc/asset/CreateAsset")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"GroupId\": \"group-20260319072926-rrnmg\",\n  \"AssetType\": \"Audio\",\n  \"URL\": \"https://example.com/audio.mp3\",\n  \"model\": \"volc-asset-audio\",\n  \"Name\": \"background-music\"\n}"

response = http.request(request)
puts response.read_body

200

{
  "Id": "asset-20260320120147-pqwhc"
}

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}

Authorizations

Authorization · string · header · required

Bearer token authentication. Format Bearer <token> where <token> is your API Key.

Body

application/jsonmultipart/form-data

GroupId · string · required

Asset group ID.

Example:

"group-20260319072926-rrnmg"

AssetType · enum<string> · required

Asset type. Fixed value Audio for audio.

Available options: Audio

Example:

"Audio"

URL · string · required

Audio URL, Data URI, or raw Base64 string (wav/mp3, ≤15 MB).

Example:

"https://example.com/audio.mp3"

model · enum<string>

Billing model. Fixed value volc-asset-audio for audio.

Available options: volc-asset-audio

Example:

"volc-asset-audio"

Name · string

Asset name.

Example:

"background-music"

Response

200

application/json

Audio asset created successfully

Id · string

Asset ID. Use as asset://<ID> in Seedance 2.0 requests.

Example:

"asset-20260320120147-pqwhc"