How to Use the Seedream 5.0 Flash Edit API: image to image integration guide (2026)

Seedream 5.0 Flash Edit is an image to image model by Doubao: Generate one image from a text prompt and 1–10 reference images. $0.018 per image at all supported sizes; reference inputs are free. On NamiFusion you can try it in the playground (exact quote shown before you submit), then call it through one unified REST API — about $0.018 per output image.

TL;DR

· Task type: image to image, provided by Doubao

· Pricing: about $0.018 per output image ($1 = 100 credits), pay-as-you-go

· Getting started: playground (exact quote before submit) → create an API key → one POST request

· Tunable parameters: 4 (see the table below)

· No platform watermark; commercial use allowed (per the Terms of Service)

What can you build with Seedream 5.0 Flash Edit?

Social media visuals and covers: batch-generate on-theme images and schedule them straight away.

E-commerce and ad creatives: product scenes, banner backgrounds, and multi-variant visuals for A/B tests.

Concept art and ideation: characters, environments and style boards, iterated cheaply and fast.

Pipeline chaining: outputs feed directly into image-to-video or face swap as source material.

How do you call this API?

1. Sign up on NamiFusion and create a key on the API Keys page (signup bonus credits can only be used on selected models).
2. Submit a task with the cURL example below, passing your key as a Bearer token.
3. Poll the task status with the returned task_uuid and read the output URLs when completed.

# 1) Submit — returns { "task_uuid": "..." }
curl -X POST "https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-v5.0-flash/image-to-image" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "prompt": "Transform the input product photo into a clean premium studio advertisement image: keep the main subject and overall composition, remove background clutter, place it on a soft neutral backdrop with natural shadows, enhance lighting and color accuracy, sharpen important details, and give it a polished high-end commercial look.",
    "images": [
      "https://d1s3annbwribom.cloudfront.net/marketplace/examples/2026/09/24/2c544aa09e3a.jpeg"
    ],
    "size": "1024x1024",
    "output_format": "jpeg"
  }
}'

# 2) Poll until status is "completed", then read the output URLs
curl "https://www.namifusion.com/api/v1/marketplace/run/tasks/TASK_UUID" \
  -H "Authorization: Bearer YOUR_API_KEY"

What parameters does it take?

prompt (Prompt): required

images (Images): required

size (Size): optional, default "1024x1024"

output_format (Output Format): optional, default "jpeg"

How do you write prompts for Seedream 5.0 Flash Edit?

1. Subject first: lead with the actor and action, then add environment, lighting and style ("an astronaut sprinting through a neon street in the rain, cinematic, shallow depth of field").
2. Concrete nouns beat stacked adjectives: "85mm portrait lens, golden-hour backlight" works far better than "very beautiful, ultra high quality".
3. Change one variable per iteration: pin the seed to reproduce a result, tweak a single phrase at a time so you know what actually moved the output.
4. State negatives positively: instead of "no blur", ask for "sharp focus, crisp details".

How much does it cost?

Pay per output image in credits: about $0.018 per output image ($1 = 100 credits). The total depends on the actual output count; the playground shows the precharge quote before submission.