curl --request POST \
  --url https://api.evolink.ai/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "kling-custom-element",
  "model_params": {
    "element_name": "My Character",
    "element_description": "A young male character with short hair, wearing a white T-shirt",
    "reference_type": "image_refer",
    "element_image_list": {
      "frontal_image": "https://example.com/front.jpg",
      "refer_images": [
        {
          "image_url": "https://example.com/side.jpg"
        }
      ]
    }
  }
}
'

{
  "created": 1757169743,
  "id": "task-unified-1757169743-8dxnm6yz",
  "model": "kling-custom-element",
  "object": "video.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 600
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_call",
    "credits_reserved": 1,
    "user_group": "default"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "Invalid request parameters",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "Invalid or expired token",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": "insufficient_quota",
    "message": "Insufficient quota. Please top up your account.",
    "type": "insufficient_quota"
  }
}

{
  "error": {
    "code": "model_access_denied",
    "message": "Token does not have access to model: kling-custom-element",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Too many requests, please try again later",
    "type": "rate_limit_error"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "Internal server error",
    "type": "api_error"
  }
}

{
  "error": {
    "code": "upstream_error",
    "message": "Upstream AI service unavailable",
    "type": "upstream_error"
  }
}

Kling

Kling Custom Element

Kling Custom Element (kling-custom-element) creates reusable subject elements (characters/objects) from reference images or videos
After successful creation, the returned element_id can be referenced in Kling O3 series and Kling V3 Image-to-Video via the element_list parameter, enabling consistent character appearance control
Asynchronous processing mode, use the returned task ID to query status
Upon task completion, result_data will contain the element_id for video generation

Important Notes:

This model is used to create reusable subjects (elements), it does not generate videos, no prompt / duration / quality / aspect_ratio parameters are needed

POST

videos

generations

curl --request POST \
  --url https://api.evolink.ai/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "kling-custom-element",
  "model_params": {
    "element_name": "My Character",
    "element_description": "A young male character with short hair, wearing a white T-shirt",
    "reference_type": "image_refer",
    "element_image_list": {
      "frontal_image": "https://example.com/front.jpg",
      "refer_images": [
        {
          "image_url": "https://example.com/side.jpg"
        }
      ]
    }
  }
}
'

{
  "created": 1757169743,
  "id": "task-unified-1757169743-8dxnm6yz",
  "model": "kling-custom-element",
  "object": "video.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 600
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_call",
    "credits_reserved": 1,
    "user_group": "default"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "Invalid request parameters",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "Invalid or expired token",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": "insufficient_quota",
    "message": "Insufficient quota. Please top up your account.",
    "type": "insufficient_quota"
  }
}

{
  "error": {
    "code": "model_access_denied",
    "message": "Token does not have access to model: kling-custom-element",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Too many requests, please try again later",
    "type": "rate_limit_error"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "Internal server error",
    "type": "api_error"
  }
}

{
  "error": {
    "code": "upstream_error",
    "message": "Upstream AI service unavailable",
    "type": "upstream_error"
  }
}

Authorizations

Authorization

string

header

required

All APIs require Bearer Token authentication

Get API Key:

Visit API Key Management Page to get your API Key

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json

model

enum<string>

default:kling-custom-element

required

Model name

Available options:

kling-custom-element

Example:

"kling-custom-element"

model_params

object

required

Model parameters

Show child attributes

callback_url

string<uri>

HTTPS callback URL for task completion

Callback Timing:

Triggered when task is completed, failed, or cancelled
Sent after billing confirmation

Security Restrictions:

HTTPS protocol only
Internal IP addresses are prohibited (127.0.0.1, 10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.)
URL length must not exceed 2048 characters

Callback Mechanism:

Timeout: 10 seconds
Maximum 3 retries after failure (at 1/2/4 seconds after failure)
Callback response format is consistent with task query API
2xx status code is considered successful, other codes trigger retry

Example:

"https://your-domain.com/webhooks/video-task-completed"

Response

Subject element creation task submitted successfully

created

integer

Task creation timestamp

Example:

1757169743

string

Task ID

Example:

"task-unified-1757169743-8dxnm6yz"

model

string

Actual model name used

Example:

"kling-custom-element"

object

enum<string>

Task type

Available options:

video.generation.task

progress

integer

Task progress percentage (0-100)

Required range: 0 <= x <= 100

Example:

0

status

enum<string>

Task status

Available options:

pending,

processing,

completed,

failed

Example:

"pending"

task_info

object

Task details

Show child attributes

type

enum<string>

Task output type

Available options:

video

Example:

"video"

usage

object

Usage and billing information

Show child attributes

Seedance 2.0 Mini Reference-to-Video Kling-O3 Text to Video

Image Series

Video Series

Audio Series

Text Series

Account Management

Task Management

File Management

Kling Custom Element

Authorizations

All APIs require Bearer Token authentication

Body

Response