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POST
/
v1
/
images
/
generations
curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "flux-kontext-pro",
    "prompt": "Cyberpunk city at night, neon lights flickering",
    "size": "16:9",
    "metadata": {
      "response_format": "png"
    }
  }'

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "flux-kontext-pro",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}
  • Flux Kontext image generation and editing model
  • Choose flux-kontext-pro (Pro) or flux-kontext-max (Max, higher quality) via the model parameter
  • Supports text-to-image and image editing modes
  • With reference image = image editing; without = text-to-image
  • Fixed billing per request
  • Async task mode, returns task_id for querying results
Important Change: For better performance and cost control, we no longer support passing base64 image data directly in image_urls. Please use the Upload Image API first to upload images and get URLs, then call this endpoint.

​
Authorization

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Authorization
string
required
All endpoints require Bearer Token authenticationGet your API Key: Visit the API Key Management Page to get your API KeyAdd to request header:
Authorization: Bearer YOUR_API_KEY

​
Request Parameters

​
model
string
required
Image generation model nameOptions:
  • flux-kontext-pro - Pro version
  • flux-kontext-max - Max version, higher quality
​
prompt
string
required
Text description for image generation
​
size
string
Image aspect ratioDefault:
  • With reference image: match_input_image (match input image)
  • Without reference image: 16:9
Supported aspect ratios:
ValueDescription
match_input_imageMatch input image ratio (image editing only)
1:1Square
4:3 / 3:4Traditional display ratio
16:9 / 9:16Widescreen/portrait
3:2 / 2:3Standard photo
21:9 / 9:21Ultrawide/ultra-narrow
​
image_urls
string[]
Reference image URL array for image editing⚠️ URL format only (base64 not supported)
  • Publicly accessible image URL (http:// or https://)
  • Use the Upload Image API to upload local images and get URLs
Limits:
  • Maximum 1 image
  • With image = image editing mode; without = text-to-image mode
​
metadata
object
Metadata parameters for additional configuration options

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Response

​
id
string
Unique task identifier for querying task status
​
object
string
Object type, fixed as generation.task
​
model
string
Model name used for generation
​
status
string
Task status
  • queued - Waiting to be processed
  • in_progress - Processing
  • completed - Successfully completed
  • failed - Failed
​
progress
integer
Task progress percentage (0-100)
​
created_at
integer
Task creation timestamp (Unix timestamp)
​
metadata
object
Task metadata

​
Use Cases

​
Case 1: Text-to-Image

{
  "model": "flux-kontext-pro",
  "prompt": "Cyberpunk city at night, neon lights flickering",
  "size": "16:9",
  "metadata": {
    "response_format": "png",
    "safety_tolerance": 2
  }
}

​
Case 2: Image Editing

{
  "model": "flux-kontext-max",
  "prompt": "Transform this photo into watercolor style",
  "size": "match_input_image",
  "image_urls": ["https://example.com/photo.jpg"],
  "metadata": {
    "response_format": "jpg",
    "prompt_upsampling": true
  }
}

​
Case 3: High-Quality Text-to-Image (Max Model)

{
  "model": "flux-kontext-max",
  "prompt": "A cute orange cat sunbathing on a windowsill, photorealistic style",
  "size": "1:1",
  "metadata": {
    "response_format": "png",
    "safety_tolerance": 3
  }
}
Query Task ResultsImage generation is an async task. After submission, a task ID is returned. Use the Get Task Status endpoint to query generation progress and results.
curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "flux-kontext-pro",
    "prompt": "Cyberpunk city at night, neon lights flickering",
    "size": "16:9",
    "metadata": {
      "response_format": "png"
    }
  }'

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "flux-kontext-pro",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}