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POST
/
v1
/
images
/
generations
doubao-seedream-4.0 Interface
curl --request POST \
  --url https://api.evolink.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "doubao-seedream-4.0",
  "prompt": "A serene lake reflecting the beautiful sunset scenery",
  "size": "16:9",
  "quality": "2K"
}
'
{
  "created": 1757165031,
  "id": "task-unified-1757165031-seedream4d",
  "model": "doubao-seedream-4.0",
  "object": "image.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 45
  },
  "type": "image",
  "usage": {
    "billing_rule": "per_call",
    "credits_reserved": 1.8,
    "user_group": "default"
  }
}

Authorizations

​
Authorization
string
header
required

##All APIs require Bearer Token authentication##

Get API Key:

Visit API Key Management Page to get your API Key

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json
​
model
enum<string>
default:doubao-seedream-4.0
required

Image generation model name

Available options:
doubao-seedream-4.0
Example:

"doubao-seedream-4.0"

​
prompt
string
required

Prompt describing the image to be generated, or describing how to edit the input image, limited to 2000 tokens

Maximum string length: 2000
Example:

"A serene lake reflecting the beautiful sunset scenery"

​
n
integer

Specifies the upper limit for the number of images to generate, supports any integer value between [1,15]

Note:

  • If you need to generate multiple images, please include in the prompt: " generate 2 different images " or similar instructions

  • Reference image count + final generated image count ≤ 15

  • If: reference image count + required images in prompt > 15, and required images in prompt ≤ parameter n value, then final generated image count = 15 - reference image count

  • Single request will pre-charge based on the value of n, actual billing is based on the number of images generated

Example:

1

​
size
string

Size of generated images, supports two formats:

Method 1 - Ratio format:

  • auto, 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9
  • Works with quality parameter to automatically generate images at the specified ratio and resolution, no need to specify exact pixels

Method 2 - Pixel format:

  • Width x height, such as: 1280x720, 1024x1024, 4096x4096 and other values within the range
  • Total pixel range: [1280x720, 4096x4096]
  • Aspect ratio range: [1/16, 16]
Example:

"16:9"

​
quality
enum<string>

Resolution tier, used in combination with ratio format of size

Options:

  • 1K: 1K resolution
  • 2K: 2K resolution
  • 4K: 4K resolution

Works with ratio format of size to automatically generate images at the corresponding resolution

Available options:
1K,
2K,
4K
Example:

"2K"

​
prompt_priority
enum<string>
default:standard

Prompt optimization strategy for setting the mode of prompt optimization function

Options:

  • standard: Standard mode, higher quality output, longer processing time
  • fast: Fast mode, faster generation speed, average quality
Available options:
standard,
fast
Example:

"standard"

​
image_urls
string<uri>[]

Reference image URL list for image-to-image and image editing functions

Note:

  • Maximum number of input images per request: 14
  • Image size: not exceeding 10MB
  • Supported image formats: .jpeg, .jpg, .png, .webp, .bmp, .tiff, .gif
  • Aspect ratio (width/height) range: [1/16, 16]
  • Width/height (px) > 14
  • Total pixels: not exceeding 6000×6000
  • Image URLs must be directly accessible by the server, or the image URL should directly download when accessed (typically these URLs end with image file extensions, such as .png, .jpg)
Maximum array length: 14
Example:
[
  "https://example.com/image1.png",
  "https://example.com/image2.png"
]
​
callback_url
string<uri>

HTTPS callback address after task completion

Callback Timing:

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

Security Restrictions:

  • Only HTTPS protocol is supported
  • Callback to internal IP addresses is 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
  • Maximum 3 retries on failure (retries after 1 second/2 seconds/4 seconds)
  • Callback response body format is consistent with the task query API response format
  • Callback address returning 2xx status code is considered successful, other status codes will trigger retry
Example:

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

Response

Image generation task created successfully

​
created
integer

Task creation timestamp

Example:

1757165031

​
id
string

Task ID

Example:

"task-unified-1757165031-seedream4d"

​
model
string

Actual model name used

Example:

"doubao-seedream-4.0"

​
object
enum<string>

Specific type of the task

Available options:
image.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

Async task information

​
type
enum<string>

Output type of the task

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

"image"

​
usage
object

Usage and billing information