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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": "wan2.7-reference-video",
  "prompt": "The character from the reference video dancing on a meadow",
  "video_urls": [
    "https://example.com/reference.mp4"
  ]
}
'
{
  "created": 1757169743,
  "id": "task-unified-1757169743-7cvnl5zw",
  "model": "wan2.7-reference-video",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 120
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_call",
    "credits_reserved": 5,
    "user_group": "default"
  }
}

Documentation Index

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

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

Authorizations

​
Authorization
string
header
required

All APIs require Bearer Token authentication

Get your API Key:

Visit the API Key management page to obtain your API Key

Add to request headers:

Authorization: Bearer YOUR_API_KEY

Body

application/json
​
model
enum<string>
required

Model name, must be wan2.7-reference-video

Available options:
wan2.7-reference-video
Example:

"wan2.7-reference-video"

​
prompt
string
required

Text prompt for video generation. Supports Chinese and English; each character / letter / punctuation counts as 1, with overflow auto-truncated. Maximum length 5000 characters

Character indexing rules:

  • Chinese: use "图1, 图2 / 视频1, 视频2" — corresponds 1-based to the order of image_urls / video_urls
  • English: use "Image 1", "Video 1" (capitalised, with a space between word and digit)
  • Images and videos are counted independently, so "Image 1" and "Video 1" can coexist
  • If only one reference image or one reference video is provided, you can simply write "the reference image" or "the reference video"

Multi-grid (storyboard) image: when one multi-grid image is provided, describe key shots in storyboard form; the model recognises the grid layout and fills in the missing transitions

Maximum string length: 5000
Example:

"Video 1 holds Image 3 and plays a soft country folk tune on the chair in Image 4"

​
negative_prompt
string

Negative prompt describing what should not appear in the video. Supports both Chinese and English. Maximum length 500 characters; overflow is auto-truncated

Maximum string length: 500
Example:

"Blurry, low quality"

​
image_start
string<uri>

Starting-frame image URL, used as the first frame of the generated video. Does not count toward the image_urls + video_urls ≤ 5 limit. Does not accept voice binding (the starting frame itself is not assigned a voice)

Use cases:

  • Subject already appears in the starting frame: combine with reference materials to reinforce identity consistency
  • Subject not in the starting frame: reference materials define new subjects appearing as the video progresses

Image limits:

  • Formats: JPEG, JPG, PNG (transparency not supported), BMP, WEBP
  • Resolution: width and height in [240, 8000] pixels
  • Aspect ratio: 1:8 ~ 8:1
  • File size: up to 20MB
Example:

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

​
image_urls
string<uri>[]

Reference image URL array. Can supply subjects (people / animals / objects) or scene backgrounds; when a subject is included, each image should contain a single character

Quantity limits:

  • image_urls + video_urls total ≤ 5
  • At least one of image_urls / video_urls must be provided (passing only image_start is not enough)

Image limits:

  • Formats: JPEG, JPG, PNG (transparency not supported), BMP, WEBP
  • Resolution: width and height in [240, 8000] pixels
  • Aspect ratio: 1:8 ~ 8:1
  • File size: up to 20MB
Example:
[
  "https://example.com/ref1.jpg",
  "https://example.com/ref2.jpg"
]
​
video_urls
string<uri>[]

Reference video URL array. The video should ideally feature a subject (person / animal / object); empty or pure-background footage is discouraged. When a subject is included, each video should contain a single character. Audio in the video can be used as a voice reference

Quantity limits:

  • image_urls + video_urls total ≤ 5
  • At least one of image_urls / video_urls must be provided

Video limits:

  • Formats: mp4, mov
  • Duration: 1 ~ 30 seconds
  • Resolution: width and height in [240, 4096] pixels
  • Aspect ratio: 1:8 ~ 8:1
  • File size: up to 100MB

Note: when video_urls is provided, duration is capped at 10 seconds

Example:
["https://example.com/reference.mp4"]
​
audio_urls
string<uri>[]

[Compatibility field — prefer model_params.voice_bindings]

Reference voice URL array. Bound positionally to reference materials in this order: first match against video_urls, then against image_urls (in their array order, one-to-one). Up to 5 elements

Priority:

  • When both model_params.voice_bindings and audio_urls are supplied, only voice_bindings is used and this field is ignored
  • If a video in video_urls carries audio and no voice binding is set for it, the original audio is used; an explicit voice binding overrides the original audio

Audio limits:

  • Supported formats: wav, mp3
  • Duration range: 1 ~ 10 seconds
  • File size: up to 15MB
Maximum array length: 5
Example:
[
  "https://example.com/voice1.mp3",
  "https://example.com/voice2.mp3"
]
​
model_params
object

Advanced parameter container (recommended)

​
quality
enum<string>
default:720p

Video quality, defaults to 720p

Options:

  • 720p: Standard definition, standard price, this is the default
  • 1080p: High definition, higher price
Available options:
720p,
1080p
Example:

"720p"

​
aspect_ratio
enum<string>
default:16:9

Video aspect ratio, defaults to 16:9

Behavior:

  • image_start not provided: video is generated using the specified aspect_ratio
  • image_start provided: this field is ignored; the video uses an aspect ratio close to the starting-frame image

Output resolution per quality tier:

Quality16:99:161:14:33:4
720p1280×720720×1280960×9601104×832832×1104
1080p1920×10801080×19201440×14401648×12481248×1648
Available options:
16:9,
9:16,
1:1,
4:3,
3:4
Example:

"16:9"

​
duration
number
default:5

Video duration in seconds (integer)

Range:

  • Without video_urls: 2 ~ 15, default 5
  • With video_urls: 2 ~ 10 (capped at 10 seconds)

Billing: based on the actual generated video duration

Required range: 2 <= x <= 15
Example:

5

​
seed
integer

Random seed, defaults to random

Notes:

  • Range: 1 ~ 2147483647
  • Fixing the seed reduces variation when iterating on prompts and improves reproducibility
Required range: 1 <= x <= 2147483647
Example:

42

​
prompt_extend
boolean
default:false

Whether to enable intelligent prompt rewriting. When enabled, a large model will optimize the prompt, which significantly improves results for simple or insufficiently descriptive prompts.

Note: Default is false. Omitting the field or sending false will not trigger rewriting; explicitly send true to enable.

Example:

false

​
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:

  • Only HTTPS protocol is supported
  • Callbacks to 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
  • Up to 3 retries after failure (retries at 1/2/4 seconds after failure)
  • Callback response format is consistent with the task query API response
  • 2xx status codes are considered successful, other status codes trigger retries
Example:

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

Response

Video task created successfully

​
created
integer

Task creation timestamp

Example:

1757169743

​
id
string

Task ID

Example:

"task-unified-1757169743-7cvnl5zw"

​
model
string

Actual model name used

Example:

"wan2.7-reference-video"

​
object
enum<string>

Specific 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

Detailed video task information

​
type
enum<string>

Task output type

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

"video"

​
usage
object

Usage and billing information