Add an instrumental stem

curl --request POST \
  --url https://apistable.ai/api/v1/tasks/create_task \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "suno_add_stem",
  "input": {
    "audio_id": "YOUR_AUDIO_ID",
    "stem_prompt": "Piano"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    model: 'suno_add_stem',
    input: {audio_id: 'YOUR_AUDIO_ID', stem_prompt: 'Piano'}
  })
};

fetch('https://apistable.ai/api/v1/tasks/create_task', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://apistable.ai/api/v1/tasks/create_task"

payload = {
    "model": "suno_add_stem",
    "input": {
        "audio_id": "YOUR_AUDIO_ID",
        "stem_prompt": "Piano"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "code": 200,
  "msg": "success",
  "data": {
    "task_id": "<string>"
  }
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

POST

api

tasks

create_task

Add an instrumental stem

curl --request POST \
  --url https://apistable.ai/api/v1/tasks/create_task \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "suno_add_stem",
  "input": {
    "audio_id": "YOUR_AUDIO_ID",
    "stem_prompt": "Piano"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    model: 'suno_add_stem',
    input: {audio_id: 'YOUR_AUDIO_ID', stem_prompt: 'Piano'}
  })
};

fetch('https://apistable.ai/api/v1/tasks/create_task', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://apistable.ai/api/v1/tasks/create_task"

payload = {
    "model": "suno_add_stem",
    "input": {
        "audio_id": "YOUR_AUDIO_ID",
        "stem_prompt": "Piano"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "code": 200,
  "msg": "success",
  "data": {
    "task_id": "<string>"
  }
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

{
  "code": 123,
  "msg": "<string>",
  "data": null
}

Operations are enabled individually by server configuration. Disabled operations return 503 without a task. Music credit deduction is currently disabled.

Using this operation

Add a selected instrumental part to existing audio. Receive the new part or wait for the mix.

1. Prepare the fields shown in the example below. Replace sample URLs and IDs with resources you can access.
1. Set model to suno_add_stem and place the parameters inside input. Submit once and save the returned task_id.
1. Query the saved task or receive its callback. A processing result is not a reason to submit the operation again.
Read songs from result.data.data. Each song has its own APIstable id, which can be used as audio_id in a later task.

Create task

Send model and input to the common task endpoint. callback_url is an optional top-level public HTTPS address. All resource IDs are APIstable IDs owned by your account. Music credit deduction is currently disabled.

{
  "model": "suno_add_stem",
  "input": {
    "audio_id": "YOUR_AUDIO_ID",
    "stem_prompt": "Piano"
  }
}

Acceptance response

HTTP 200 confirms acceptance, not completion. Query GET /api/v1/tasks/{task_id} until data.status is succeeded or failed. Read data.result only after success; a failed task has its error in data.message.

{
  "code": 200,
  "msg": "success",
  "data": {
    "task_id": "YOUR_TASK_ID"
  }
}

Parameter reference

Field	Type	Required	Description and limits
audio_id	string	Yes	APIstable song ID belonging to your account. Cover/extend accept this ID only, without a source task_id or external URL. maxLength: 200
stem_prompt	string	Yes	PayAPI extension: describe the instrument or backing stem to add. maxLength: 1000
model	string	No / conditional	Suno version: V6, V6_MINI or V6_WILD. Extension must match the generated source model. values: V6, V6_MINI, V6_WILD; default: V6
title	string	No / conditional	Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation. maxLength: 100
result_mode	string	No / conditional	Extension/replacement: full_song (default) or segment. Added stem: mixed (default) or stem. Full/mixed results wait for assembly. values: stem, mixed; default: mixed

Inputs and limits

The schema lists supported fields, types and basic limits. Also follow Important conditions: cross-field and source-resource checks are not fully represented in JSON Schema. Unknown parameters are rejected. URL fields accept public HTTPS URLs, never file objects.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "audio_id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200,
      "description": "APIstable song ID belonging to your account. Cover/extend accept this ID only, without a source task_id or external URL."
    },
    "stem_prompt": {
      "type": "string",
      "minLength": 1,
      "maxLength": 1000,
      "description": "PayAPI extension: describe the instrument or backing stem to add."
    },
    "model": {
      "default": "V6",
      "type": "string",
      "enum": [
        "V6",
        "V6_MINI",
        "V6_WILD"
      ],
      "description": "Suno version: V6, V6_MINI or V6_WILD. Extension must match the generated source model."
    },
    "title": {
      "type": "string",
      "maxLength": 100,
      "description": "Title. Generate/cover: up to 80 characters; extend and other operations: up to 100. Required for custom generation."
    },
    "result_mode": {
      "default": "mixed",
      "type": "string",
      "enum": [
        "stem",
        "mixed"
      ],
      "description": "Extension/replacement: full_song (default) or segment. Added stem: mixed (default) or stem. Full/mixed results wait for assembly."
    }
  },
  "required": [
    "audio_id",
    "stem_prompt"
  ],
  "additionalProperties": false
}

Important conditions

full_song/mixed results wait for assembly; segment/stem returns the requested part. An assembly failure is not reported as a complete song. Partial song success is identified by the result message.
Song audio may be MP3 or M4A. Use suno_export_mp3 for an actual MP3 file. Unavailable optional cover art may be null; audio remains usable.
Uploaded files last 24 hours, generated files 14 days and task details 30 days. Reused files keep their original expiry. Valid Voice/Persona identity mappings are separate from task-log cleanup. Download files you need to retain.

Result schema

The creation response is {code:200,msg:“success”,data:{task_id}}. Poll GET /api/v1/tasks/{task_id}. On success, data.result is an object matching the schema below; it is otherwise null. input remains a JSON string.

{
  "type": "object",
  "required": [
    "code",
    "msg",
    "data"
  ],
  "properties": {
    "code": {
      "const": 200
    },
    "msg": {
      "type": "string"
    },
    "data": {
      "type": "object",
      "required": [
        "callbackType",
        "task_id",
        "data"
      ],
      "properties": {
        "callbackType": {
          "const": "complete"
        },
        "task_id": {
          "type": "string"
        },
        "data": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "id",
              "audio_url",
              "stream_audio_url",
              "image_url",
              "prompt",
              "lyrics",
              "model_name",
              "title",
              "createTime",
              "duration",
              "tags",
              "source_audio_url",
              "source_image_url",
              "source_stream_audio_url"
            ],
            "properties": {
              "id": {
                "type": "string"
              },
              "audio_url": {
                "type": "string"
              },
              "stream_audio_url": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "image_url": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "prompt": {
                "type": "string"
              },
              "lyrics": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "model_name": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "title": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "createTime": {
                "type": [
                  "integer",
                  "null"
                ]
              },
              "duration": {
                "type": [
                  "number",
                  "null"
                ]
              },
              "tags": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "source_audio_url": {
                "type": "string"
              },
              "source_image_url": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "source_stream_audio_url": {
                "type": [
                  "string",
                  "null"
                ]
              }
            }
          }
        }
      }
    }
  }
}

Song duration is in seconds; task duration is in milliseconds. createTime is a Unix timestamp in milliseconds or null. Current stream_audio_url and source_stream_audio_url are null. source_audio_url/source_image_url refer to the same APIstable-hosted copies as audio_url/image_url, not provider links. Process the actual song array; upload registration does not imply two newly generated songs.

Voice: all four steps File uploads Callbacks

Authorizations

Authorization

string

header

required

Every valid key can submit and query its own account. Revoked keys are rejected.

Body

application/json

model

enum<string>

required

Available options:

suno_add_stem

Example:

"suno_add_stem"

input

object

required

Show child attributes

callback_url

string<uri>

Optional public HTTPS endpoint for signed completion callbacks; no redirects or private IPs.

Response

Accepted task. Poll the common task endpoint or use callback_url.

code

any

required

msg

any

required

data

object

required

Show child attributes

Getting started with APIstable

Market

Add an instrumental stem

Using this operation

Create task

Acceptance response

Parameter reference

Inputs and limits

Important conditions

Result schema

Authorizations

Body

Response

​Using this operation

​Create task

​Acceptance response

​Parameter reference

​Inputs and limits

​Important conditions

​Result schema

​Related workflows

Authorizations

Body

Response

Using this operation

Create task

Acceptance response

Parameter reference

Inputs and limits

Important conditions

Result schema

Related workflows