Seedream 5.5 API

About Seedream 5.5

Seedream 5.5 is ByteDance's newest Seedream image model. It makes images from a prompt, edits with up to ten pictures, and splits a finished image into a base and transparent layers. Sizes run from 1K to 4K in eight aspect ratios, and PNG output can have a transparent background.

Call it with the model name bytedance/seedream-5.5/layer-decomposition on POST /jobs/createTask, from $0.0195.

Introduction

Seedream 5.5 Layer Decomposition splits a finished PNG or JPEG into an opaque base image and separate transparent layers.

Key features

• Named layers: each layer comes back with a name, a stacking order and a bounding box. The base image has no bounding box.
• A count you set: num_outputs takes 2 to 100 and counts the base image. The default is 10.
• A ceiling, not a promise: a limit of six returned six images from a menu, and a limit of five returned four from a three-line poster.
• PNG layers: layers are always transparent PNG, and output_format only sets the base image.

Request parameters

Pricing

Prices are in USD. The API uses a separate USD balance. Website credits cannot be used or transferred to it, and API funds cannot be transferred to website credits. When a task is accepted, we reserve the maximum quoted amount from your API balance. On completion, we charge for actual usage, never more than the hold, and release the remainder. If the task fails, the hold is released.

Send the same request body to POST /jobs/quote to see the estimated and maximum USD charge before running. A quote does not run the task or charge your balance.

Use cases

• Menus: separate each element so one line can change without redrawing the page.
• Posters: split lettering into independent text layers.
• Design files: turn a flat image into pieces you can move and restyle.

Prompt guide & pro tips

• Start from a source of at least 512 x 512 pixels, in PNG or JPEG.
• Name the pieces in prompt if you want specific ones. Leave it out and the model picks the main elements.
• Mark a region with <bbox>x1 y1 x2 y2</bbox>, using coordinates from 0 to 1000.
• Raise num_outputs for finer layers. A higher limit usually splits the image into smaller pieces.
• Keep resolution on auto to follow the source, or pick 1k, 1.5k or 2k.

API quick start

Call the Seedream 5.5 API in three steps

1. Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow-. API calls use your separate USD balance.
2. Send the request. POST /jobs/createTask with model bytedance/seedream-5.5/layer-decomposition and an input object that follows the parameter table. The response returns a task ID straight away.
3. Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.

# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "bytedance/seedream-5.5/layer-decomposition",
  "input": {
    "image_url": "https://media.popnow.ai/influencer/examples/marco.webp",
    "num_outputs": 10,
    "resolution": "auto",
    "output_format": "png"
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.

Seedream 5.5 API questions

More about Seedream 5.5

Try it

Seedream 5.5 AI Image Generator onlineCreate images with Seedream 5.5 in PopNow

Endpoints

Seedream 5.5 · Create ImageSeedream 5.5 · Edit Image

Docs

Seedream 5.5 model ID and input schema in the API docsPopNow API quickstart: send your first requestImage generation guide for the PopNow APIWebhooks: get Seedream 5.5 results without polling