Bytedance Seedance 2.0 Fast Image To Video Spicy API Documentation

Bytedance Seedance 2.0 Fast Image To Video Spicy API Documentation

Playground

Seedance 2.0 Fast Spicy Image to Video is a fast AI image-to-video generation model that creates high-quality cinematic clips from images at faster speed and lower cost, optimized for scalable content generation with smooth animations and stable aesthetics. Ready-to-use REST inference API for animating images, social media clips, product videos, advertising creatives, visual storytelling, and professional image-to-video workflows with simple integration, no coldstarts, and affordable pricing.

Features

Seedance 2.0 Fast Spicy generates unlimited high-quality cinematic clips from images at faster speed and lower cost than the standard Seedance 2.0 Spicy. It transforms static images into dynamic video with bold motion, rich tonal contrast, and stable temporal coherence — perfect for high-volume, iteration-heavy creative workflows.

Why It Works Well

• Speed-optimized generation: Faster processing for quick turnaround.
• 17% lower base cost than Seedance 2.0 Spicy.
• Unlimited-style generation: Optimized for high-quality, smooth animations at scale.
• Expressive motion: Bold, vivid motion with stable aesthetics and natural transitions.
• Flexible resolution: 480p, 720p (default), 1080p, or 4k to match your needs.
• Duration control: 4–15 second clips with fine-grained control.
• Native audio: Optional synchronized audio for complete audiovisual output.

Parameters

How to Use

1. Upload your image (ensure clarity and proper framing).
2. (Optional) Enter a prompt describing desired motion, mood, or camera movement.
3. Select resolution and duration.
4. (Optional) Set aspect_ratio to match your target platform.
5. (Optional) Set a seed for consistent results.
6. Click Run to generate your video.

Writing Effective Prompts

The input image sets the first frame — your prompt directs what happens from there. The clearer the motion and camera direction, the better the result.

1. Start from the frame

Describe the action that begins from your image: what the subject does, where it goes, how the camera moves. Don’t re-describe what’s already visible in the image — build on it.

The woman in the photo turns from the window and walks toward the camera; slow push-in, warm interior light.

2. Shot-by-shot timeline

For longer clips, break the motion into timed segments (1-second granularity), continuous, no gaps.

> 0-2s: She turns from the window, a faint smile forming. Camera holds. > 2-5s: She walks toward the lens and stops mid-frame; slow push-in, shallow focus. > 5-8s: She glances off-screen as light shifts from warm to cool. Handheld drift.

3. Consistency notes

Lock the look for the whole clip: camera style, lighting, palette, atmosphere, audio.

Camera language

Write these directly; the model understands them:

• Shot size — extreme wide, wide, medium, medium close-up, close-up
• Movement — push in, pull out, pan, track, follow, orbit, tilt up, handheld shake
• Angle — low angle, overhead, eye-level, first-person
• Techniques — one-shot / long take, dolly zoom, bullet time, speed ramp

For a niche term, add a plain-language gloss: “rack focus: the sharp foreground softens as the background comes into focus.”

Referencing uploaded assets

When you attach images, videos, or audio, bind each one explicitly in the prompt by its upload order — @image1, @video1, @audio1 — and say what it’s for. Don’t rely on labels drawn inside the image itself.

• “The knight in @image1 walks through the castle in @image2.”
• “Refer to @video1 for the camera movement only; keep its shot order.”
• “@image1 and @image2 are Character 1, voiced by @audio1.”

When a reference is already accurate, just point to it — no need to re-describe it in detail.

Negative control

Positive descriptions work best, but you can suppress subtitles and audio:

• “No subtitles.”
• “No BGM — ambient and action sounds only.”
• “No audio.”

Weak vs. strong

Pricing

Billing Rules

• Base rate (480p): $0.50 per 5 seconds
• 720p: 2× the 480p price
• 1080p: 5× the 480p price (2.5× the 720p price)
• 4k: 10x the 480p price (2x the 1080p price).
• Audio generation: Enabling or disabling audio does not change the price.
• Duration range: 4–15 seconds (continuous)

Notes

• Works best with clear, well-lit images.
• Match aspect ratios to your input image to avoid awkward crops.
• Use Fast Spicy for iteration; switch to Seedance 2.0 Spicy when you need maximum quality.

Related Models

• Seedance 2.0 Fast Image-to-Video — Standard Fast tier.
• Seedance 2.0 Image-to-Video Spicy — Standard Spicy tier with maximum quality.
• Seedance V1.5 Pro Image-to-Video Spicy — Previous-generation spicy variant.

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'
{
  "image": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg",
  "aspect_ratio": "16:9",
  "resolution": "720p",
  "duration": 5,
  "generate_audio": true
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/image-to-video-spicy" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}")

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 "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}")
  RESULT=$(printf '%s' "${RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

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

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters