Seedream 5.0 Flash

doubao/seedream-v5.0-flash/text-to-image

Generate one image from a text prompt. $0.018 per image at all supported sizes; reference inputs are free.

Examples

Seedream 5.0 Flash Examples 1

Parameters

NameTypeDefaultConstraintsDescription
prompt *Prompttextarea—≤ 5000 charsThe positive prompt for the generation.
output_formatOutput Formatselectjpegjpeg | pngThe format of the output image.
sizeSizetext2048x2048—Specify the width and height pixel values of the generated image.Total pixel value range: [1280*720, 2048*2048*1.1025]

Output fields

FieldTypeDescription
imagesarray<string>Generated image URLs.

API

Call this model through one unified REST API. Get a key on the API Keys page.

cURL
# 1) Submit — returns { "task_uuid": "..." }
curl -X POST "https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-v5.0-flash/text-to-image" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "prompt": "A cinematic futuristic city street at dusk after light rain, neon signs in English and Japanese reflecting on wet pavement, a stylish young woman in a transparent umbrella walking past a ramen shop, soft volumetric fog, detailed storefronts, realistic lighting, ultra-detailed, vibrant colors, natural skin tones, sharp focus",
    "output_format": "jpeg",
    "size": "2048x2048"
  }
}'

# 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"
Python
import time, requests

API_KEY = "YOUR_API_KEY"
HEADERS = {"Authorization": f"Bearer {API_KEY}"}

# 1) Submit
resp = requests.post(
    "https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-v5.0-flash/text-to-image",
    headers=HEADERS,
    json={
        "input": {
            "prompt": "A cinematic futuristic city street at dusk after light rain, neon signs in English and Japanese reflecting on wet pavement, a stylish young woman in a transparent umbrella walking past a ramen shop, soft volumetric fog, detailed storefronts, realistic lighting, ultra-detailed, vibrant colors, natural skin tones, sharp focus",
            "output_format": "jpeg",
            "size": "2048x2048"
        }
    },
)
resp.raise_for_status()  # 401/402/429/5xx stop here instead of polling a bad task
task = resp.json()

# 2) Poll until a terminal state (completed / failed / cancelled).
#    This model is allowed up to 300s server-side.
deadline = time.time() + 360
while task.get("status") not in ("completed", "failed", "cancelled"):
    if time.time() > deadline:
        raise TimeoutError(f"still {task.get('status')} — keep the task_uuid and poll later")
    time.sleep(3)
    poll = requests.get(f"https://www.namifusion.com/api/v1/marketplace/run/tasks/{task['task_uuid']}", headers=HEADERS)
    poll.raise_for_status()
    task = poll.json()

print(task["status"], task.get("output"))
JavaScript
const API_KEY = "YOUR_API_KEY";
const HEADERS = { Authorization: `Bearer ${API_KEY}` };

// 1) Submit
const resp = await fetch("https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-v5.0-flash/text-to-image", {
  method: "POST",
  headers: { ...HEADERS, "Content-Type": "application/json" },
  body: JSON.stringify({
    "input": {
      "prompt": "A cinematic futuristic city street at dusk after light rain, neon signs in English and Japanese reflecting on wet pavement, a stylish young woman in a transparent umbrella walking past a ramen shop, soft volumetric fog, detailed storefronts, realistic lighting, ultra-detailed, vibrant colors, natural skin tones, sharp focus",
      "output_format": "jpeg",
      "size": "2048x2048"
    }
  }),
});
if (!resp.ok) throw new Error(`submit failed: ${resp.status} ${await resp.text()}`);
let task = await resp.json();

// 2) Poll until a terminal state (completed / failed / cancelled).
//    This model is allowed up to 300s server-side.
const deadline = Date.now() + 360 * 1000;
while (!["completed", "failed", "cancelled"].includes(task.status)) {
  if (Date.now() > deadline) throw new Error(`still ${task.status} — keep the task_uuid and poll later`);
  await new Promise((r) => setTimeout(r, 3000));
  const poll = await fetch(`https://www.namifusion.com/api/v1/marketplace/run/tasks/${task.task_uuid}`, { headers: HEADERS });
  if (!poll.ok) throw new Error(`poll failed: ${poll.status}`);
  task = await poll.json();
}

console.log(task.status, task.output);

Documentation

Seedream 5.0 Flash

doubao/seedream-v5.0-flash/text-to-image

Generate one image from a text prompt. $0.018 per image at all supported sizes; reference inputs are free.

Pricing

BytePlus official list price: $0.018 per output image = 1.8 credits per output image. Input images are free. All supported sizes have the same unit price. USD 1 = 100 credits. Account discounts, if any, apply separately.

Each request generates one image and costs 1.8 credits ($0.018) before account discounts. Reference image count does not add a fee. Failed tasks are refunded.

Parameters

ParameterRequiredDefault / limits
promptYes5000 characters
output_formatNojpeg; jpeg, png
sizeNo2048x2048

Use size for image dimensions. For generation/editing, explicit widthxheight values are supported: 921,600–4,624,220 total pixels, aspect ratio from 1:16 to 16:1. Examples: 1024x1024, 1536x1536, 2048x2048, 2048x1024. Both limits must hold. 512x512 and 4K are outside the supported range. This MaaS contract exposes size; do not send separate resolution or aspect_ratio fields.

Example

curl -X POST 'https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-v5.0-flash/text-to-image' \
  -H "Authorization: Bearer $API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "input": {
    "prompt": "A cinematic futuristic city street at dusk after light rain, neon signs in English and Japanese reflecting on wet pavement, a stylish young woman in a transparent umbrella walking past a ramen shop, soft volumetric fog, detailed storefronts, realistic lighting, ultra-detailed, vibrant colors, natural skin tones, sharp focus",
    "output_format": "jpeg",
    "size": "2048x2048"
  }
}'
curl 'https://www.namifusion.com/api/v1/marketplace/run/tasks/TASK_UUID' \
  -H "Authorization: Bearer $API_KEY"

Response

Submission returns task_uuid and status. Poll with the same API key until completed or failed. Successful image URLs are in output.images; cost_credits is in credits and may reflect the precharge until settlement finishes. Use your own accessible input image URL for editing or decomposition. The example URL below is from the MaaS public model example.

BytePlus official pricing · Official image API

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