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POST
/
v1
/
images
/
generations
nano-banana Interface
curl --request POST \
  --url https://api.evolink.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "nano-banana-beta",
  "prompt": "A cat playing on the grass"
}
'
{
  "created": 1757165031,
  "id": "task-unified-1757165031-uyujaw3d",
  "model": "nano-banana-beta",
  "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": 1.6,
    "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:nano-banana-beta
required

Image generation model name

Backward Compatible: The previously integrated model name gemini-2.5-flash-image is still supported and will be automatically mapped to nano-banana-beta

Available options:
nano-banana-beta
Example:

"nano-banana-beta"

​
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 cat playing in the grass"

​
size
enum<string>

Aspect ratio of the generated image, default value is auto

Available options:
auto,
1:1,
2:3,
3:2,
4:3,
3:4,
16:9,
9:16
​
image_urls
string<uri>[]

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

Note:

  • Maximum number of input images per request: 5
  • Image size: not exceeding 10MB
  • Supported file formats: .jpeg, .jpg, .png, .webp
  • 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)
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-uyujaw3d"

​
model
string

Actual model name used

Example:

"nano-banana-beta"

​
object
enum<string>

Specific task type

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

Asynchronous task information

​
type
enum<string>

Task output type

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

"image"

​
usage
object

Usage and billing information