Bytedance Seedream V4 API Documentation

Bytedance Seedream V4 API Documentation

Playground

Seedream 4.0 by is a state-of-the-art image generation model delivering high-fidelity outputs and outperforming Nano Banana. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

A text-to-image model optimized for multi-panel/tiled posters, concept designs with copy, series KV, and social media assets. It excels at grid-based layouts, whitespace planning, and type readability.

Model Highlights

• Layout-aware: Grids (2×2, triptych, comics), keeps whitespace/safe areas for title/subtitle/CTA.
• Consistent series: Unified palette, lighting, and camera across panels/KV.
• High fidelity: Strong identity/detail retention; clean edges, fewer artifacts.
• High-res: 2K default; custom ratios; up to 8192×8192.

Price

Only $0.027 for one run!!!

Copy-ready Templates

2×2 Grid Poster

2×2 grid poster, clean margins for typography; title top-center: “{TITLE}”; subtitle: “{SUBTITLE}”. Panel 1: {SCENE_A}; Panel 2: {SCENE_B}; Panel 3: {SCENE_C}; Panel 4: {SCENE_D}. Consistent color grading, cinematic lighting, brand color {BRAND_COLOR}, high-legibility background, minimal clutter.

Triptych (Horizontal)

Horizontal triptych, left-to-right narrative: {SCENE_A} → {SCENE_B} → {SCENE_C}. Unified palette {BRAND_COLOR}, soft vignette, clear gutters, strong typographic hierarchy, reserved space for CTA: “{CTA}”.

Comic (4-Panel Strip)

4-panel comic layout with speech-bubble placeholders. Panel 1: {SCENE_A}; Panel 2: {SCENE_B}; Panel 3: {SCENE_C}; Panel 4: {SCENE_D}. Bold line art, flat shading, clear gutters, high readability.

Minimalist Poster

Minimalist poster; large centered title: “{TITLE}”; small subtitle below: “{SUBTITLE}”. Single focal object: {OBJECT}. Monochrome + accent {BRAND_COLOR}. High-legibility background; strict grid; generous whitespace.

How to Use

1. Enter your prompt: Describe the subject, layout, text placement (title/subtitle/CTA), and style.

2. Set size: Choose width/height. Maximum: 8192×8192.

3. Run: Click Run to generate. If needed, tweak the prompt or size and run again.

Recommended Resolutions

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "size": "2048*2048"
}
JSON
)

# 1. Submit the prediction once. Never retry this request automatically:
# a retry after an unclear failure can create a second, billed task.
CHECK='The task may already exist. Check History or the predictions list before submitting again.'
if ! SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --connect-timeout 10 --max-time 60 \
  -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedream-v4" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}"); then
  printf 'Submit failed. %s\n' "${CHECK}" >&2
  exit 1
fi

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id. %s\n' "${CHECK}" >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"

# 2. Poll until the prediction reaches a final status.
BODY_FILE=$(mktemp)
trap 'rm -f "${BODY_FILE}"' EXIT
while true; do
  # Transient errors (429, 5xx) are retried, honoring Retry-After.
  HTTP_CODE=$(curl --silent --show-error --fail-with-body \
    --connect-timeout 10 --max-time 60 --retry 5 --retry-delay 2 \
    --output "${BODY_FILE}" --write-out '%{http_code}' \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}" || true)
  case "${HTTP_CODE}" in
    2??) ;;
    000|429|5??)  # dropped connection or temporary error: keep polling
      printf 'Task %s: HTTP %s, polling again in 10s\n' "${PREDICTION_ID}" "${HTTP_CODE}" >&2
      sleep 10; continue ;;
    *) printf 'Task %s: HTTP %s\n' "${PREDICTION_ID}" "${HTTP_CODE}" >&2
      cat "${BODY_FILE}" >&2; exit 1 ;;
  esac
  RESULT=$(jq 'if type == "object" and has("data") then .data else . end' "${BODY_FILE}")
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  case "${STATUS}" in
    completed) printf '%s\n' "${RESULT}" | jq '.outputs'; break ;;
    failed|cancelled|timeout|deleted)
      printf 'Task %s ended with status %s\n' "${PREDICTION_ID}" "${STATUS}" >&2
      printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    *) sleep 2 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Every model also accepts the global request options enable_sync_mode and enable_base64_output; see their pages for details.

Response Parameters

Result Request Parameters

Result Response Parameters