Extend Music - PoYo AI

curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "extend-music",
  "callback_url": "https://your-domain.com/callback",
  "input": {
    "default_param_flag": true,
    "audio_id": "audio_abc123",
    "instrumental": false,
    "prompt": "Continue with an energetic chorus section",
    "style": "Pop, Upbeat",
    "title": "Summer Vibes Extended",
    "continue_at": 120,
    "mv": "V5_5",
    "negative_tags": "Heavy Metal, Sad",
    "style_weight": 0.7
  }
}
'

{
  "code": 200,
  "data": {
    "task_id": "task-unified-1757165031-uyujaw3d",
    "status": "not_started",
    "created_time": "2025-11-12T10:30:00"
  }
}

POST

api

generate

submit

curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "extend-music",
  "callback_url": "https://your-domain.com/callback",
  "input": {
    "default_param_flag": true,
    "audio_id": "audio_abc123",
    "instrumental": false,
    "prompt": "Continue with an energetic chorus section",
    "style": "Pop, Upbeat",
    "title": "Summer Vibes Extended",
    "continue_at": 120,
    "mv": "V5_5",
    "negative_tags": "Heavy Metal, Sad",
    "style_weight": 0.7
  }
}
'

{
  "code": 200,
  "data": {
    "task_id": "task-unified-1757165031-uyujaw3d",
    "status": "not_started",
    "created_time": "2025-11-12T10:30:00"
  }
}

After submission, a task_id will be returned. If you provided a callback_url, when the task status becomes finished or failed, a POST request will be sent to the callback_url.
Regardless of whether callback_url is provided, you can retrieve the response result through the unified Query Music Detail endpoint.

instrumental explicitly controls vocal output. persona_model accepts style_persona or voice_persona with persona_id only when default_param_flag: true on V5, V5_5, V6, V6_MINI, or V6_WILD.

Usage Guide

This endpoint extends an existing audio track from a specified point
You can customize the extension with new style, prompt, and title, or inherit from the original track
mv is required. Use default_param_flag to control whether custom style, title, and continue_at are required

Parameter Details

In Custom Mode ( default_param_flag: true ):
- style, title, and continue_at are required
- prompt is required for vocal extensions. When instrumental: true, prompt is not sent.
- continue_at specifies the timestamp (in seconds) where extension begins
- Character limits vary by model:
  - V4: prompt 3000 characters, style 200 characters, title 80 characters
  - V4_5 & V4_5PLUS: prompt 5000 characters, style 1000 characters, title 100 characters
  - V4_5ALL: prompt 5000 characters, style 1000 characters, title 80 characters
  - V5: prompt 5000 characters, style 1000 characters, title 100 characters
  - V5_5: prompt 5000 characters, style 1000 characters, title 100 characters
  - V6, V6_MINI, and V6_WILD: prompt 5000 characters, style 1000 characters, title 100 characters
In Simple Mode ( default_param_flag: false ):
- audio_id and mv are required; the source track settings are inherited

Developer Notes

Ensure you have a valid audio_id from a previously generated track before using this endpoint
The extension will seamlessly continue from the specified continue_at timestamp

Optional parameters

negative_tags (string): Music styles or characteristics to exclude from the extension.
vocal_gender (string): Vocal gender preference. Use m for male, f for female. Note: This parameter increases the probability but cannot guarantee adherence.
style_weight (number): Strength of adherence to style. Range 0-1, up to 2 decimals.
weirdness_constraint (number): Controls creative deviation. Range 0-1, up to 2 decimals.
audio_weight (number): Balance weight for audio features. Range 0-1, up to 2 decimals.
persona_id (string): Persona ID to apply to the extended music. Only available when default_param_flag: true with V5, V5_5, V6, V6_MINI, or V6_WILD. How to generate persona_id, visit generate-persona.
persona_model (string): style_persona or voice_persona. Requires persona_id, default_param_flag: true, and V5, V5_5, V6, V6_MINI, or V6_WILD.

Authorizations

Authorization

string

header

required

All API endpoints require Bearer Token authentication.

Create an API key: sign in to PoYo, open Dashboard → API Key at poyo.ai/dashboard/api-key, and click to create a key.

Add it to the request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json

model

enum<string>

required

API model identifier.

Must be extend-music for this endpoint.

Available options:

extend-music

Example:

"extend-music"

input

object

required

Input parameters for music extension

Show child attributes

callback_url

string<uri>

Webhook callback URL for result notifications.

Endpoint that receives task completion updates.

Example:

"https://your-domain.com/callback"

Response

200 - application/json

Task submitted successfully

code

enum<integer>

required

Business status code. 200 means success; any other value means the request failed. Always check this field: some validation errors return HTTP 200 with code: 400 in the body.

200: Success
400: Invalid request parameters
401: Missing or invalid API key
402: Insufficient credits
403: Permission denied
404: Resource not found
408: Request timeout
429: Rate limit exceeded
500: Internal server error
502: Upstream service error
503: Service unavailable

See Error Codes for details.

Available options:

200,

400,

401,

402,

403,

404,

408,

429,

500,

502,

503

Example:

200

data

object

required

Show child attributes

​Usage Guide

​Parameter Details

​Developer Notes

​Optional parameters

Authorizations

Body

Response

Usage Guide

Parameter Details

Developer Notes

Optional parameters