Flux Kontext

Context-aware image generation with style transfer and content understanding

Endpoints

Method	Endpoint	Description
POST	`/api/v1/generateTask/flux-kontext`	Create generation task
GET	`/api/v1/statusTask/flux-kontext`	Query task status

Authentication

All requests require an API Key in the header:

Authorization: Bearer YOUR_API_KEY

Request Body

{
  "request_type": "async",
  "callback_url": "https://...",
  "provider": "auto",
  "input": {
    "mode": "pro",
    "prompt": "...",
    "aspect_ratio": "16:9",
    "image_urls": ["..."],
    "output_format": "jpeg"
  }
}

Parameters

Parameter

Required

Default

Description

request_typestring

—

async

async (polling) or callback (webhook)

callback_urlstring

✱

—

Callback URL, required when request_type=callback

providerstring

—

auto

Routing strategy: auto, value, or official

inputobject

✓

—

Model input parameters

Mode Options:

pro — Higher quality, slower generation
max — Balanced quality and speed

Example

Text-to-Image

curl -X POST "https://api.apixo.ai/api/v1/generateTask/flux-kontext" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "pro",
      "prompt": "a castle on the hill at sunset",
      "aspect_ratio": "16:9",
      "output_format": "jpeg"
    }
  }'

Image-to-Image (Style Transfer)

curl -X POST "https://api.apixo.ai/api/v1/generateTask/flux-kontext" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "provider": "official",
    "input": {
      "mode": "max",
      "prompt": "transform this into a watercolor painting",
      "aspect_ratio": "16:9",
      "image_urls": ["https://example.com/ref.jpg"],
      "output_format": "png",
      "safetyTolerance": 2
    }
  }'

Response

POST /api/v1/generateTask/flux-kontext

Returns taskId on success for subsequent status queries.

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Error:

{
  "code": 400,
  "message": "Insufficient credits",
  "data": null
}

GET /api/v1/statusTask/flux-kontext

Query task execution status and results via taskId.

curl -X GET "https://api.apixo.ai/api/v1/statusTask/flux-kontext?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/xxx.png\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Failed:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines"
  }
}

Status Response Fields

Field	Type	Description
`taskId`	string	Unique task identifier
`state`	string	`pending` `processing` `success` `failed`
`resultJson`	string	JSON containing `resultUrls` array (on success)
`failCode`	string	Error code (on failure)
`failMsg`	string	Error message (on failure)
`createTime`	integer	Task creation timestamp (ms)
`completeTime`	integer	Task completion timestamp (ms)
`costTime`	integer	Processing duration (ms)

Error Codes

Code	Description
400	Invalid parameters or request error
401	Invalid or missing API Key
429	Rate limit exceeded

Fail Code	Description
`CONTENT_VIOLATION`	Content violates safety guidelines
`INVALID_IMAGE_URL`	Cannot access provided image URL

Rate Limits

Limit	Value
Requests	10000 / minute
Concurrent tasks	1000

Exceeding limits returns 429 error. Wait and retry.

Tips

Generation time: Average ~30 seconds. Submit task, wait 20 seconds, then poll every 3 seconds.
Callback mode: For high-concurrency scenarios, use callback mode to avoid frequent polling.
Image expiration: Result URLs are valid for 15 days. Download and store important outputs promptly.
Content moderation: Prompts must comply with content safety guidelines. Violations return CONTENT_VIOLATION.
Reference images: image_urls supports JPG, PNG, WebP formats, max 10MB per image.
Context understanding: Kontext mode excels at understanding reference image style and composition.
Mode selection: pro mode offers higher quality but slower speed; max balances quality and speed.

Flux Kontext

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