How to Use the Seedance 2.0 Fast Image to Video API: image to video integration guide (2026)

Seedance 2.0 Fast Image to Video is an image to video model by Doubao: Seedance 2.0 Fast (Image-to-Video) generates cinematic videos from reference images and text prompts with native audio-visual synchronization, director-level control, and exceptional motion stability — optimized for faster generation at lower cost. Built on Seed's unified multimodal architecture. On NamiFusion you can try it in the playground (exact quote shown before you submit), then call it through one unified REST API — a typical run costs about $1.00.

TL;DR

· Task type: image to video, provided by Doubao

· Pricing: about $1.00 per typical run ($1 = 100 credits), pay-as-you-go

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

· Tunable parameters: 7 (see the table below)

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

What can you build with Seedance 2.0 Fast Image to Video?

Short-form video and ad clips: go from a prompt or a single image to publishable motion content.

Product demos and concept previews: validate storyboards and visual direction cheaply before any shoot.

A social content factory: batch vertical clips and ride trending topics fast.

Remixing existing assets: image-to-video brings static work to life and extends its lifespan.

How do you call this API?

1. Sign up on NamiFusion and create a key on the API Keys page (free credits on signup).

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/seedance-2-0-fast/image-to-video" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "prompt": "A cinematic slow push-in on a lone astronaut standing on a windswept red desert at sunset, dust drifting across the ground as distant storm clouds roll over the horizon. The astronaut turns slightly toward a glowing research outpost in the distance, cape and suit details moving naturally in the wind. Subtle handheld camera motion, dramatic lighting, epic sci-fi mood, highly realistic motion, synchronized ambient wind and distant machinery sounds.",
    "first_frame": "https://assets-public.namifusion.com/marketplace/images/2026-06-12/638e1ee18ac7.jpeg",
    "last_frame": "https://assets-public.namifusion.com/marketplace/images/2026-06-12/b4826e0e01e2.jpeg",
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "duration": 6,
    "generate_audio": true
  }
}'

# 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

first_frame (Image): required

last_frame (Last Image): optional

aspect_ratio (Aspect Ratio): optional

resolution (Resolution): optional, default "720p"

duration (Duration): optional, default 5

generate_audio (Generate Audio): optional, default true

How do you write prompts for Seedance 2.0 Fast Image to Video?

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-use in credits. A typical run costs about $1.00 ($1 = 100 credits); the exact price varies with parameters like resolution or duration, and the playground shows the exact quote before you submit.