curl --request POST \
  --url https://api.evolink.ai/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "wan2.7-image-to-video",
  "generation_mode": "first_frame",
  "prompt": "A cat playing piano",
  "image_start": "https://example.com/first_frame.jpg"
}
'

{
  "created": 1757169743,
  "id": "task-unified-1757169743-7cvnl5zw",
  "model": "wan2.7-image-to-video",
  "object": "video.generation.task",
  "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"
  }
}

{
  "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: wan2.7-image-to-video",
    "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"
  }
}

Wan2.7

Wan2.7 Image to Video

WAN2.7 (wan2.7-image-to-video) model supports image-to-video generation with multimodal inputs (image / audio / video)
Choose one of three generation modes via the generation_mode parameter:
- first_frame: First-frame to video — generate a video starting from the given first frame, optional driving audio
- first_last_frame: First-and-last-frame to video — generate a video by interpolating between the first and last frames, optional driving audio
- video_continuation: Video continuation — continue an input video clip; an optional ending frame is allowed (no driving audio)
generation_mode is optional (backward compatible); if omitted, an appropriate mode will be selected automatically based on the materials in the request
Valid material combinations (any other combination will be rejected):
1. image_start (first frame)
2. image_start + audio_urls (first frame + driving audio)
3. image_start + image_end (first + last frame)
4. image_start + image_end + audio_urls (first + last frame + driving audio)
5. video_urls (video continuation)
6. video_urls + image_end (video continuation + last frame)
Asynchronous processing mode, use the returned task ID to query status
Generated video links are valid for 24 hours, please save them promptly

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": "wan2.7-image-to-video",
  "generation_mode": "first_frame",
  "prompt": "A cat playing piano",
  "image_start": "https://example.com/first_frame.jpg"
}
'

{
  "created": 1757169743,
  "id": "task-unified-1757169743-7cvnl5zw",
  "model": "wan2.7-image-to-video",
  "object": "video.generation.task",
  "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"
  }
}

{
  "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: wan2.7-image-to-video",
    "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"
  }
}

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-image-to-video

Available options:

wan2.7-image-to-video

Example:

"wan2.7-image-to-video"

generation_mode

enum<string>

Generation mode that determines which material combinations are valid. Explicitly specifying it is recommended

Values:

first_frame: First-frame to video. Required: image_start. Optional: audio_urls. Not accepted: image_end, video_urls
first_last_frame: First-and-last-frame to video. Required: image_start + image_end. Optional: audio_urls. Not accepted: video_urls
video_continuation: Video continuation. Required: video_urls[0]. Optional: image_end (used as ending frame). Not accepted: image_start, audio_urls

Backward-compatible behavior: when generation_mode is omitted, an appropriate mode will be selected automatically based on the materials in the request; explicit specification is recommended to avoid ambiguity

Available options:

first_frame,

first_last_frame,

video_continuation

Example:

"first_frame"

prompt

string

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

Maximum string length: 5000

Example:

"A cat playing piano"

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>

First-frame image URL

Mode constraints:

first_frame mode: required
first_last_frame mode: required
video_continuation mode: not allowed

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_end

string<uri>

Ending-frame image URL

Mode constraints:

first_last_frame mode: required
video_continuation mode: optional (acts as the ending frame for the continuation)
first_frame mode: not allowed (use first_last_frame if both first and last frames are needed)

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/last_frame.jpg"

video_urls

string<uri>[]

Video continuation URL array. Only 1 element is supported

Mode constraints:

video_continuation mode: required
first_frame / first_last_frame mode: not allowed
Cannot be combined with audio_urls

Video limits:

Formats: mp4, mov
Duration: 2 ~ 10 seconds (length of the input clip itself)
Resolution: width and height in [240, 4096] pixels
Aspect ratio: 1:8 ~ 8:1
File size: up to 100MB

Continuation duration rules:

duration represents the total final output video length (input clip + model-generated continuation)
Generated continuation length = duration − input video length
duration must be ≥ input video length
Billing is based on the total final output length (i.e. duration)

Examples:

Input clip length	duration	Continuation generated	Final output	Billed
3s	15	12s	15s	15s
5s	10	5s	10s	10s
8s	8	0s (input only)	8s	8s

Example:

["https://example.com/clip.mp4"]

audio_urls

string<uri>[]

Driving audio URL array. Currently supports only 1 element. The model will use this audio as the driving source for video generation (e.g. lip sync, motion alignment)

Mode constraints:

first_frame mode: optional
first_last_frame mode: optional
video_continuation mode: not allowed (cannot be combined with video_urls)

Format requirements:

Supported formats: wav, mp3
Duration range: 2 ~ 30 seconds
File size: up to 15MB

Truncation handling:

If audio length exceeds duration, the first N seconds are extracted and the rest discarded
If audio length is shorter than the video duration, the remaining portion is silent. For example: if audio is 3s and video duration is 5s, the first 3s have sound and the last 2s are silent

Required array length: 1 element

Example:

["https://example.com/audio.mp3"]

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"

duration

number

default:5

Video duration in seconds (integer). Range 2 ~ 15, default 5

Meaning:

first_frame / first_last_frame modes: total length of the generated video
video_continuation mode: total length of the final output video (= original input clip + model-generated continuation)

Additional constraints in video_continuation mode:

duration must be ≥ input video length (otherwise an error is returned)
Generated continuation length = duration − input video length
When duration equals the input video length, no continuation is generated and the input clip is returned as-is
See the continuation duration rules and examples in the video_urls field for details

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

string

Task ID

Example:

"task-unified-1757169743-7cvnl5zw"

model

string

Actual model name used

Example:

"wan2.7-image-to-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

Show child attributes

type

enum<string>

Task output type

Available options:

text,

image,

audio,

video

Example:

"video"

usage

object

Usage and billing information

Show child attributes

Image Series

Video Series

Audio Series

Text Series

Account Management

Task Management

File Management

Wan2.7 Image to Video

Authorizations

All APIs require Bearer Token authentication

Body

Response