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POST
/
v1
/
videos
/
generations
curl --request POST \ --url https://api.evolink.ai/v1/videos/generations \ --header 'Authorization: Bearer <token>' \ --header 'Content-Type: application/json' \ --data ' { "model": "happyhorse-1.0-reference-to-video", "prompt": "A woman in a red qipao character1, the camera first frames the slim cut of the qipao from a side medium shot, then switches to a low-angle upward shot capturing details as she gracefully lifts her hand to open a folding fan character2, with tasseled earrings character3 swaying lightly as she turns her head.", "image_urls": [ "https://cdn.example.com/girl.jpg", "https://cdn.example.com/folding-fan.jpg", "https://cdn.example.com/earrings.jpg" ], "quality": "720p", "aspect_ratio": "16:9", "duration": 5 } '
{
  "created": 1761313744,
  "id": "task-unified-1761313744-h1r2vef0",
  "model": "happyhorse-1.0-reference-to-video",
  "object": "video.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 2400,
    "video_duration": 5
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_second",
    "credits_reserved": 607500,
    "user_group": "default"
  }
}

Authorizations

​
Authorization
string
header
required

##All endpoints require Bearer Token authentication##

Get API Key:

Visit the API Key Management Page to obtain your API Key

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json
​
model
enum<string>
default:happyhorse-1.0-reference-to-video
required

Video generation model name

Available options:
happyhorse-1.0-reference-to-video
Example:

"happyhorse-1.0-reference-to-video"

​
prompt
string
required

Text prompt, required

Length limits:

  • Chinese: up to 2500 characters
  • Non-Chinese: up to 5000 characters
  • Excess content is automatically truncated

Character reference convention (important):

  • The prompt must explicitly use character1, character2, character3 ... keywords to reference images in image_urls in order
  • The 1st image corresponds to character1, the 2nd to character2, and so on
  • Missing explicit references may cause character confusion
Example:

"A woman in a red qipao character1, the camera first frames the slim cut of the qipao from a side medium shot, then switches to a low-angle upward shot capturing details as she gracefully lifts her hand to open a folding fan character2, with tasseled earrings character3 swaying lightly as she turns her head."

​
image_urls
string<uri>[]
required

Reference image URL array, required, 1 ~ 9 images

Image requirements:

  • Supported formats: JPEG, JPG, PNG, WEBP
  • Resolution: short edge ≥ 400 px; 720P or higher quality images are recommended (avoid extremely small, blurry, or heavily compressed images)
  • Recommended aspect ratio: short edge / long edge ≥ 0.4, with consistent proportions across images (close to the target video ratio)
  • File size: ≤ 10MB per image
  • Image URLs must be publicly accessible (HTTP or HTTPS); private OSS, intranet, or authenticated links are not supported

Order: Array order corresponds to character1, character2 ... references in the prompt

Required array length: 1 - 9 elements
Example:
[
  "https://cdn.example.com/girl.jpg",
  "https://cdn.example.com/folding-fan.jpg",
  "https://cdn.example.com/earrings.jpg"
]
​
quality
enum<string>
default:720p

Video resolution tier, defaults to 720p

Options:

  • 720p: Standard clarity, this is the default
  • 1080p: HD clarity

Billing note: Resolution tier directly affects billing

Available options:
720p,
1080p
Example:

"720p"

​
aspect_ratio
enum<string>
default:16:9

Video aspect ratio, defaults to 16:9

Options:

  • 16:9 (landscape)
  • 9:16 (portrait)
  • 1:1 (square)
  • 4:3
  • 3:4
Available options:
16:9,
9:16,
1:1,
4:3,
3:4
Example:

"16:9"

​
duration
integer
default:5

Video duration (seconds), defaults to 5 seconds

Range:

  • Integer 3 ~ 15
  • Duration directly affects billing
Required range: 3 <= x <= 15
Example:

5

​
seed
integer

Random seed, default is random

Details:

  • Range: 1 ~ 2147483647
  • A fixed seed reduces parameter-induced variation when iterating on prompts and improves reproducibility
Required range: 1 <= x <= 2147483647
Example:

42

​
callback_url
string<uri>

HTTPS callback URL for task completion

Callback timing:

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

Security restrictions:

  • Only HTTPS protocol is supported
  • Callbacks to private 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
  • Up to 3 retries after failure (at 1/2/4 seconds after failure respectively)
  • Callback response body format is consistent with the task query endpoint response format
  • A 2xx status code is considered successful; other status codes trigger retries
Example:

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

Response

Video generation task created successfully

​
created
integer

Task creation timestamp

Example:

1761313744

​
id
string

Task ID

Example:

"task-unified-1761313744-h1r2vef0"

​
model
string

Actual model name used

Example:

"happyhorse-1.0-reference-to-video"

​
object
enum<string>

Specific type of the task

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,
cancelled
Example:

"pending"

​
task_info
object

Video task details

​
type
enum<string>

Output type of the task

Available options:
text,
image,
audio,
video
Example:

"video"

​
usage
object

Usage and billing information