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POST
/
seedance-1.0-pro-fast-i2v
/
async
Seedance 1.0 Pro Fast I2V
curl --request POST \
  --url https://api.modellix.ai/api/v1/bytedance/seedance-1.0-pro-fast-i2v/async \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "first_frame_image": "https://example.com/first.jpg"
}
'
{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-abc123",
    "model_id": "model-123",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-abc123"
    }
  }
}

Documentation Index

Fetch the complete documentation index at: https://docs.modellix.ai/llms.txt

Use this file to discover all available pages before exploring further.

Authorizations

​
Authorization
string
header
required

API Key authentication. Format: Bearer YOUR_API_KEY.

Body

application/json
​
first_frame_image
string
required

URL or Base64 data for the first frame image. Pro Fast supports first frame only.

Minimum string length: 1
Example:

"https://example.com/first.jpg"

​
prompt
string

Description of the desired output.

Required string length: 1 - 2000
​
ratio
enum<string>
default:16:9

Aspect ratio of the generated video.

Available options:
16:9,
4:3,
1:1,
3:4,
9:16,
21:9,
adaptive
​
resolution
enum<string>
default:720p

Output resolution of the video.

Available options:
480p,
720p,
1080p
​
duration
enum<integer>
default:5

Duration of the generated video in seconds.

Available options:
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12
​
frames
integer

Total number of frames to generate.

Required range: 29 <= x <= 289
​
seed
integer
default:-1

Random seed for reproducible generation. Use -1 for random.

Required range: -1 <= x <= 2147483647
​
camera_fixed
boolean
default:false

Whether to keep the camera fixed during generation.

​
service_tier
enum<string>
default:default

Service tier for generation (e.g., default or flex).

Available options:
default,
flex
​
execution_expires_after
integer
default:172800

Task expiration time in seconds.

Required range: 3600 <= x <= 259200
​
return_last_frame
boolean
default:false

Whether to return the last frame of the generated video.

Response

200 - application/json

Task submitted successfully

​
code
integer
required

Response code, 0 indicates success

Example:

0

​
message
string
required

Response message

Example:

"success"

​
data
object
required

Detailed data about the submitted asynchronous task.