API reference · BFL

bfl/flux-lora-fill

Integrate this model through SandBase's unified API, with production-ready schemas and examples.

IMAGEAsyncOpen model

Production endpoint

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OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDbfl/flux-lora-fill

Input Schema

12 parameters · 2 required · 10 optional

Parameter	Type	Required	Description
`image`	string	Required	URL of image to use for fill operation
`prompt`	string	Required	The prompt to generate an image from. · Default: ""
`mask`	string	Optional	The mask to area to Inpaint in.
`seed`	integer	Optional	The same seed and the same prompt given to the same version of the model will output the same image every time.
`loras`	object[]	Optional	The LoRAs to use for the image generation. You can use any number of LoRAs and they will be merged together to generate the final image. · Default: []
`fill_image`	string	Optional	Use an image fill input to fill in particular images into the masked area.
`paste_back`	boolean	Optional	Specifies whether to paste-back the original image onto to the non-inpainted areas of the output · Default: true
`aspect_ratio`	string	Optional	The aspect ratio of the generated image. · Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16 21:916:93:24:35:41:14:53:42:39:16
`output_format`	string	Optional	The format of the generated image. · Options: jpeg, png · Default: "jpeg" jpegpng
`guidance_scale`	number	Optional	The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you. · Min: 28 · Max: 35 · Default: 30
`resize_to_original`	boolean	Optional	Resizes the image back to the original size. Use when you wish to preserve the exact image size as the originally provided image. · Default: false
`num_inference_steps`	integer	Optional	The number of inference steps to perform. · Min: 1 · Max: 50 · Default: 28

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
  "model": "bfl/flux-lora-fill",
  "mask": "https://static.sandbase.ai/examples/bfl/flux-lora-fill/input_mask_1.jpeg",
  "image": "https://static.sandbase.ai/examples/bfl/flux-lora-fill/input_image_0.jpeg",
  "loras": [],
  "prompt": "A knight in shining armour holding a greatshield with 'FAL' on it",
  "paste_back": true,
  "output_format": "jpeg",
  "guidance_scale": 30,
  "resize_to_original": false,
  "num_inference_steps": 28
}'

# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
  -H "Authorization: Bearer YOUR_API_KEY"

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