Seedream Image Generation

Generate and edit AI images through AceDataCloud's Seedream (ByteDance) API.

Setup: See authentication for token setup.

Quick Start

curl -X POST https://api.acedata.cloud/seedream/images \
  -H "Authorization: Bearer $ACEDATACLOUD_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "a cyberpunk cat wearing VR goggles in a neon city", "model": "doubao-seedream-5-0-260128"}'

Async: See async task polling. Poll via POST /seedream/tasks with {"id": "..."}.

Models

Model	Version	Best For
doubao-seedream-5-0-260128	Seedream 5.0	Latest, highest quality (default)
doubao-seedream-4-5-251128	Seedream 4.5	High quality, balanced
doubao-seedream-4-0-250828	Seedream 4.0	Reliable generation
doubao-seedream-3-0-t2i-250415	Seedream 3.0 T2I	Text-to-image, precise prompt following
doubao-seededit-3-0-i2i-250628	SeedEdit 3.0	Image-to-image editing

Workflows

1. Text-to-Image

POST /seedream/images
{
  "prompt": "a serene Japanese garden with cherry blossoms and a red bridge",
  "model": "doubao-seedream-5-0-260128",
  "size": "1K"
}

2. Image Editing (Image-to-Image)

Edit an existing image by providing the source image URL(s) and a descriptive prompt. Use the doubao-seededit-3-0-i2i-250628 model for best editing results.

POST /seedream/images
{
  "prompt": "change the sky to a golden sunset",
  "model": "doubao-seededit-3-0-i2i-250628",
  "image": ["https://example.com/photo.jpg"]
}

3. Async Generation with Task Polling

Pass a callback_url to receive results asynchronously via webhook, or poll /seedream/tasks for the result:

POST /seedream/images
{
  "prompt": "an epic fantasy landscape",
  "model": "doubao-seedream-5-0-260128",
  "callback_url": "https://api.acedata.cloud/health"
}

Poll the returned task_id:

POST /seedream/tasks
{"id": "<task_id>"}

Parameters

Generation

Parameter	Values	Description
model	see Models table	Model to use (required)
prompt	string	Image description (required)
size	"1K", "2K", "3K", "4K", "adaptive"	Output resolution (e.g. 1K=1024px, 2K=2048px); 3K only for Seedream 5.0
seed	integer [-1, 2147483647]	Seed for reproducibility (Seedream 3.0 T2I / SeedEdit 3.0 only)
guidance_scale	number [1, 10]	Prompt adherence strength (3.0 models only; T2I default 2.5, edit default 5.5)
sequential_image_generation	"auto", "disabled"	Generate related images in sequence (5.0, 4.5, 4.0 only)
stream	boolean	Stream images as they're generated (5.0, 4.5, 4.0 only)
watermark	boolean	Add AI-generated watermark (default: true)
output_format	"jpeg", "png"	Output file format (Seedream 5.0 only; default: jpeg)
response_format	"url", "b64_json"	Response format (default: url)
tools	array	Enable tools, e.g. [{"type": "web_search"}] (Seedream 5.0 only)
callback_url	string	Webhook URL for async delivery; returns task_id immediately

Editing

Parameter	Required	Description
image	Yes (for editing)	Array of image URLs or base64 strings (max 10MB each)
prompt	Yes	Describe the desired edit

Gotchas

• Model names now use the doubao-* naming convention (e.g. doubao-seedream-5-0-260128)
• Image editing uses the same /seedream/images endpoint with the image array parameter (no separate edit endpoint)
• size replaces separate width/height params; use "1K" for 1024×1024, "2K" for 2048×2048, etc.
• 3K size is only supported by Seedream 5.0; adaptive selects the best aspect ratio automatically
• seed only works with doubao-seedream-3-0-t2i-250415 and doubao-seededit-3-0-i2i-250628
• guidance_scale is only available for the 3.0-series models
• stream and sequential_image_generation are only available for Seedream 5.0, 4.5, and 4.0
• Pass callback_url to get a task_id immediately and avoid blocking; poll /seedream/tasks for the result — use "https://api.acedata.cloud/health" as a placeholder to force async mode without a real webhook

MCP: pip install mcp-seedream | Hosted: https://seedream.mcp.acedata.cloud/mcp | See all MCP servers