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Endpoints

MethodEndpointDescription
POST/api/v1/generateTask/veo-3-1-extendCreate extend task
GET/api/v1/statusTask/veo-3-1-extendQuery extend task status

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Authentication

All requests require an API Key in the header: 
Authorization: Bearer YOUR_API_KEY

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Request Body

{
  "request_type": "async",
  "callback_url": "https://...",
  "provider": "auto",
  "input": {
    "taskId": "internal_task_id_of_previous_veo_3_1_task",
    "mode": "fast",
    "prompt": "continue this scene with stronger motion and dramatic pacing",
    "watermark": "",
    "seed": 1234
  }
}

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Parameters

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request_type
string
default:"async"
async (polling) or callback (webhook)
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callback_url
string
Callback URL, required when request_type=callback (conditional)
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provider
string
default:"auto"
Routing strategy: auto, value, or official
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input
object
required
Model input parameters
Important Notes:
  • taskId must be an internal task ID from veo-3-1, not an external provider task ID.
  • If taskId is invalid, expired, or not from veo-3-1, the API returns TASKID_ERROR.
  • mode supports only fast and quality.

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Example

Extend with Fast Mode (Cheapest) 
curl -X POST "https://api.apixo.ai/api/v1/generateTask/veo-3-1-extend" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "taskId": "internal_task_id_from_previous_veo3_task",
      "mode": "fast",
      "prompt": "continue the action into a tense chase through narrow streets"
    }
  }'
Extend with Quality Mode 
curl -X POST "https://api.apixo.ai/api/v1/generateTask/veo-3-1-extend" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/veo_extend_callback",
    "input": {
      "taskId": "internal_task_id_from_previous_veo3_task",
      "mode": "quality",
      "prompt": "extend this scene into a dramatic sunset over the city skyline",
      "watermark": "© YourBrand",
      "seed": 1234
    }
  }'

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Response

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POST /api/v1/generateTask/veo-3-1-extend

Returns a new internal extend taskId on success. Success: 
{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "extend_task_12345678"
  }
}
Error: 
{
  "code": 400,
  "message": "TaskId not found, expired or not a veo-3-1 task.",
  "data": null
}

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GET /api/v1/statusTask/veo-3-1-extend

Query status and result with the extend taskId. 
curl -X GET "https://api.apixo.ai/api/v1/statusTask/veo-3-1-extend?taskId=extend_task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"
Success: 
{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "extend_task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/video_extend.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965730929,
    "costTime": 120000
  }
}
Failed: 
{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "extend_task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines"
  }
}

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Status Response Fields

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taskId
string
Extend task internal ID.
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state
string
Current task state: pending, processing, success, or failed.
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resultJson
string
JSON string containing resultUrls array. Only present on success.
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failCode
string
Error code. Only present when state is failed. See Error Codes.
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failMsg
string
Human-readable error message. Only present when state is failed.
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createTime
integer
Task creation timestamp (Unix milliseconds).
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completeTime
integer
Task completion timestamp (Unix milliseconds).
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costTime
integer
Processing duration in milliseconds.

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Error Codes

CodeDescription
400Invalid parameters or request error
401Invalid or missing API Key
429Rate limit exceeded
Fail CodeDescription
TASKID_ERRORTaskId not found, expired, or wrong model type
CONTENT_VIOLATIONContent violates safety guidelines
INVALID_IMAGE_URLCannot access provided image URL

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Tips

  • Cheapest+simplest preset: mode=fast with a valid taskId.
  • You can branch multiple continuation versions from one base taskId by changing prompts.
  • For production, prefer callback mode to avoid frequent polling.
  • Download outputs promptly if result URLs are temporary.
Use internal task IDs from /generateTask/veo-3-1. External provider IDs will fail.