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POST
/
veo-3-fast-i2v
/
async
curl --request POST \
  --url https://api.modellix.ai/api/v1/google/veo-3-fast-i2v/async \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "Clouds drift slowly across a blue sky",
  "image": "https://example.com/frame.jpg"
}
'
{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-i2v004",
    "model_id": "google/veo-3-fast-i2v",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-i2v004"
    }
  }
}

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

Veo 3 and Veo 3 Fast image-to-video request. Supports prompt, image, lastFrame, negativePrompt, aspectRatio, durationSeconds, resolution (up to 1080p), and personGeneration.

​
prompt
string
required

Video description text guiding the animation

Minimum string length: 1
Example:

"Flowers gently bloom in morning sunlight"

​
image
string
required

Starting frame. Accepts an image URL (e.g. https://example.com/frame.jpg). Required for I2V.

Example:

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

​
lastFrame
string

End frame. Accepts an image URL. Optional, guides the video to end at this frame.

Example:

"https://example.com/last-frame.jpg"

​
negativePrompt
string

Text describing what to avoid in the generated video.

Example:

"blurry, low quality, distorted"

​
aspectRatio
enum<string>
default:16:9

Video aspect ratio

Available options:
16:9,
9:16
Example:

"16:9"

​
durationSeconds
enum<string>

Video duration in seconds (string type)

Available options:
4,
6,
8
Example:

"4"

​
resolution
enum<string>

Video resolution

Available options:
720p,
1080p
Example:

"720p"

​
personGeneration
enum<string>

Person generation policy

Available options:
allow_adult
Example:

"allow_adult"

Response

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.