API reference · Stability AI

stability-ai/fast-sdxl/inpainting

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 IDstability-ai/fast-sdxl/inpainting

Input Schema

14 parameters · 2 required · 12 optional

Parameter	Type	Required	Description
`image`	string	Required	The URL of the image to use as a starting point for the generation.
`prompt`	string	Required	The prompt to use for generating the image. Be as descriptive as possible for best results.
`mask`	string	Optional	The URL of the mask to use for inpainting.
`seed`	integer	Optional	The same seed and the same prompt given to the same version of Stable Diffusion will output the same image every time. · Default: null
`loras`	object[]	Optional	The list of LoRA weights to use. · Default: []
`format`	string	Optional	The format of the generated image. · Options: jpeg, png · Default: "jpeg" jpegpng
`strength`	number	Optional	determines how much the generated image resembles the initial image · Min: 0.01 · Max: 1 · Default: 0.95
`embeddings`	object[]	Optional	The list of embeddings to use. · Default: []
`request_id`	string	Optional	An id bound to a request, can be used with response to identify the request itself. · Default: ""
`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
`expand_prompt`	boolean	Optional	If set to true, the prompt will be expanded with additional prompts. · Default: false
`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: 0 · Max: 20 · Default: 7.5
`num_inference_steps`	integer	Optional	The number of inference steps to perform. · Min: 1 · Max: 65 · Default: 25
`safety_checker_version`	string	Optional	The version of the safety checker to use. v1 is the default CompVis safety checker. v2 uses a custom ViT model. · Options: v1, v2 · Default: "v1" v1v2

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": "stability-ai/fast-sdxl/inpainting",
  "mask": "https://static.sandbase.ai/examples/stability/fast-sdxl/inpainting/input_mask_1.png",
  "seed": null,
  "image": "https://raw.githubusercontent.com/CompVis/latent-diffusion/main/data/inpainting_examples/overture-creations-5sI6fQgYIuo.png",
  "loras": [],
  "format": "jpeg",
  "prompt": "a tiger sitting on a park bench",
  "strength": 0.95,
  "embeddings": [],
  "request_id": "",
  "expand_prompt": false,
  "guidance_scale": 7.5,
  "num_inference_steps": 25,
  "safety_checker_version": "v1"
}'

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

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