## Create an image
`POST /v1/images/generations`
```bash cURL theme={null}
curl --request POST \
--url https://www.anyfast.ai/v1/images/generations \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"model": "doubao-seedream-5-0-flash-260915",
"prompt": "A single green leaf icon centered on a white background, simple flat design, no text",
"size": "1K",
"response_format": "url",
"output_format": "jpeg",
"watermark": false
}'
```
Must be `doubao-seedream-5-0-flash-260915`.
Image-generation prompt. Chinese prompts should generally stay within 300 characters and English prompts within 600 words.
`1K`, `1.5K`, `2K`, or a valid explicit `widthxheight` value. Explicit dimensions require 921,600–4,624,220 total pixels and an aspect ratio in `[1/16, 16]`.
`url` or `b64_json`. URL results expire after 24 hours.
`jpeg` or `png`.
Whether to add the AI-generated watermark.
Prompt optimization configuration.
Only `standard` is supported; `fast` is not available for Flash.
### Create response
```json 200 theme={null}
{
"model": "dola-seedream-5-0-flash-260915",
"created": 1792129491,
"data": [
{
"url": "https://example.com/seedream-flash-text.jpeg",
"size": "1024x1024",
"output_format": "jpeg"
}
],
"usage": {
"input_images": 0,
"generated_images": 1,
"output_tokens": 4096,
"total_tokens": 4096
}
}
```
## Edit or combine images
`POST /v1/images/generations`
```bash cURL theme={null}
curl --request POST \
--url https://www.anyfast.ai/v1/images/generations \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"model": "doubao-seedream-5-0-flash-260915",
"prompt": "Keep the single green leaf icon on a white background and add one small blue circle below it. Simple flat design, no text.",
"image": "https://example.com/green-leaf.jpeg",
"size": "1K",
"response_format": "url",
"output_format": "jpeg",
"watermark": false
}'
```
Must be `doubao-seedream-5-0-flash-260915`.
Editing or reference-generation instruction. Coordinate edits can use normalized `` and `` tags.
Image URL, Base64 data URI, or an array of up to 10 references.
`1K`, `1.5K`, `2K`, or a valid explicit pixel size.
`url` or `b64_json`.
`jpeg` or `png`.
Whether to add the AI-generated watermark.
Only `standard` is supported; `fast` is not available for Flash.
### Create response
```json 200 theme={null}
{
"model": "dola-seedream-5-0-flash-260915",
"created": 1792129583,
"data": [
{
"url": "https://example.com/seedream-flash-edit.jpeg",
"size": "1024x1024",
"output_format": "jpeg"
}
],
"usage": {
"input_images": 1,
"generated_images": 1,
"output_tokens": 4096,
"total_tokens": 4096
}
}
```
## Preserve transparency
`POST /v1/images/generations`
```bash cURL theme={null}
curl --request POST \
--url https://www.anyfast.ai/v1/images/generations \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"model": "doubao-seedream-5-0-flash-260915",
"prompt": "Keep the subject and refine the edges while preserving the transparent background.",
"image": "https://example.com/transparent-source.png",
"background": "transparent",
"size": "1K",
"response_format": "url",
"output_format": "png",
"watermark": false
}'
```
Must be `doubao-seedream-5-0-flash-260915`.
Editing instruction.
Exactly one input image with an alpha channel. PNG is supported; JPEG cannot carry transparency.
Use `transparent` to preserve transparent output, or `opaque` for a normal background.
`1K`, `1.5K`, `2K`, or a valid explicit pixel size.
Must be `png` when `background` is `transparent`.
`url` or `b64_json`.
Whether to add the AI-generated watermark.
### Create response
```json 200 theme={null}
{
"model": "dola-seedream-5-0-flash-260915",
"created": 1792129634,
"data": [
{
"url": "https://example.com/seedream-flash-transparent.png",
"size": "1024x1024",
"output_format": "png"
}
],
"usage": {
"input_images": 1,
"generated_images": 1,
"output_tokens": 4096,
"total_tokens": 4096
}
}
```
## Decompose an image
`POST /v1/images/generations`
```bash cURL theme={null}
curl --request POST \
--url https://www.anyfast.ai/v1/images/generations \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"model": "doubao-seedream-5-0-flash-260915",
"prompt": "Separate the green leaf icon from the white background into one editable layer.",
"image": "https://example.com/green-leaf.jpeg",
"layer_decomposition": true,
"size": "1K",
"response_format": "url",
"output_format": "jpeg",
"watermark": false
}'
```
Must be `doubao-seedream-5-0-flash-260915`.
Optional decomposition instruction. Use normalized `` coordinates to target specific elements.
Exactly one PNG or JPEG image.
Set to `true` to return one background and up to 16 editable layers.
`auto`, `1K`, `1.5K`, or `2K`. Explicit pixel sizes are not supported in this mode.
`url` or `b64_json`.
Controls only the background format. Extracted layers are always PNG.
Whether to add the AI-generated watermark.
### Create response
```json 200 theme={null}
{
"model": "dola-seedream-5-0-flash-260915",
"created": 1792129605,
"data": [
{
"url": "https://example.com/seedream-flash-layer-0.jpeg",
"size": "1024x1024",
"output_format": "jpeg",
"z_index": 0
},
{
"url": "https://example.com/seedream-flash-layer-1.png",
"size": "662x855",
"output_format": "png",
"z_index": 1,
"bounding_box": {
"absolute": [
305,
251,
729,
800
],
"normalized": [
298,
245,
711,
780
]
},
"name": "green leaf icon",
"description": "Extract the complete green leaf icon with leaf blade, veins and petiole, no other background elements included"
}
],
"usage": {
"input_images": 1,
"generated_images": 2,
"output_tokens": 8549,
"total_tokens": 8549
}
}
```
## Headers