Kling 2.1

Kuaishou Kling 2.1 video generation with standard, pro, and master tiers

Endpoints

Method	Endpoint	Description
POST	`/api/v1/generateTask/kling-2-1`	Create generation task
GET	`/api/v1/statusTask/kling-2-1`	Query task status

Authentication

All requests require an API Key in the header:

Authorization: Bearer YOUR_API_KEY

Request Body

{
  "request_type": "async",
  "callback_url": "https://...",
  "provider": "auto",
  "input": {
    "mode": "standard-image-to-video",
    "prompt": "...",
    "duration": 5,
    "image_urls": ["..."],
    "aspect_ratio": "16:9",
    "negative_prompt": "...",
    "cfg_scale": 0.5
  }
}

Parameters

Parameter

Required

Default

Description

request_typestring

—

async

async (polling) or callback (webhook)

callback_urlstring

✱

—

Callback URL, required when request_type=callback

providerstring

—

auto

Routing strategy: auto, value, or official

inputobject

✓

—

Model input parameters

Mode Options:

standard-image-to-video — Standard tier image-to-video, requires 1 image
pro-image-to-video — Pro tier image-to-video, supports 1-2 images (end frame)
master-text-to-video — Master tier text-to-video
master-image-to-video — Master tier image-to-video, requires 1 image

Example

Standard Image-to-Video

curl -X POST "https://api.apixo.ai/api/v1/generateTask/kling-2-1" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "provider": "value",
    "input": {
      "mode": "standard-image-to-video",
      "prompt": "animate this still life scene with subtle camera movement",
      "duration": 5,
      "image_urls": ["https://example.com/std_ref.jpg"],
      "negative_prompt": "blur, low quality",
      "cfg_scale": 0.6
    }
  }'

Pro Image-to-Video (with End Frame)

curl -X POST "https://api.apixo.ai/api/v1/generateTask/kling-2-1" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/callback",
    "provider": "official",
    "input": {
      "mode": "pro-image-to-video",
      "prompt": "city skyline timelapse from day to night",
      "duration": 10,
      "image_urls": [
        "https://example.com/pro_start.jpg",
        "https://example.com/pro_end.jpg"
      ],
      "cfg_scale": 0.4
    }
  }'

Master Text-to-Video

curl -X POST "https://api.apixo.ai/api/v1/generateTask/kling-2-1" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "master-text-to-video",
      "prompt": "a futuristic drone flying through neon-lit streets at night",
      "duration": 5,
      "aspect_ratio": "9:16",
      "negative_prompt": "grainy, noisy, static",
      "cfg_scale": 0.3
    }
  }'

Response

POST /api/v1/generateTask/kling-2-1

Returns taskId on success for subsequent status queries.

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Error:

{
  "code": 400,
  "message": "Insufficient credits",
  "data": null
}

GET /api/v1/statusTask/kling-2-1

Query task execution status and results via taskId.

curl -X GET "https://api.apixo.ai/api/v1/statusTask/kling-2-1?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/video.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Failed:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines"
  }
}

Status Response Fields

Field	Type	Description
`taskId`	string	Unique task identifier
`state`	string	`pending` `processing` `success` `failed`
`resultJson`	string	JSON containing `resultUrls` array (on success)
`failCode`	string	Error code (on failure)
`failMsg`	string	Error message (on failure)
`createTime`	integer	Task creation timestamp (ms)
`completeTime`	integer	Task completion timestamp (ms)
`costTime`	integer	Processing duration (ms)

Error Codes

Code	Description
400	Invalid parameters or request error
401	Invalid or missing API Key
429	Rate limit exceeded

Fail Code	Description
`CONTENT_VIOLATION`	Content violates safety guidelines
`INVALID_IMAGE_URL`	Cannot access provided image URL

Rate Limits

Limit	Value
Requests	10000 / minute
Concurrent tasks	1000

Exceeding limits returns 429 error. Wait and retry.

Tips

Generation time:
- 5-second video: ~60-90 seconds
- 10-second video: ~90-120 seconds
- Submit task, wait 60 seconds, then poll every 5 seconds
Callback mode: Video generation takes time, strongly recommend using callback mode.
Video expiration: Result URLs are valid for 15 days. Download promptly.
Content moderation: Prompts must comply with content safety guidelines.
Tier selection:
- standard: Best value, for batch generation
- pro: Supports start/end frame control, for precise creation
- master: Highest quality, for professional production
End frame feature: pro mode supports 2 images — first as start frame, second as end frame.
Negative prompt: Use negative_prompt to avoid unwanted elements.
CFG Scale:
- Higher values: Follows prompt more strictly, may lose creativity
- Lower values: More creative, may deviate from prompt
- Recommended: 0.3-0.7
Image formats: image_urls supports JPG, PNG, WebP, max 10MB per image.

Kling 2.1

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