Async video pipeline
Submit createTask once and poll recordInfo — ideal for batch and queue-based apps.
BYTEDANCE
Seedance 2 Fast
Commercial use45 credits / job
Try in Playground
Validate prompts and parameters before integration — same model and payload as production.
Request parameters
createTask input fields for the default tab.
| Field | Type | Required |
|---|---|---|
| prompt | textarea | Yes |
| aspect_ratio | select (16:9 | 9:16 | 4:3 | 1:1 | 3:4 | 21:9) | No |
| first_frame_url | file | No |
| last_frame_url | file | No |
| reference_image_urls | url-list | No |
| reference_video_urls | url-list | No |
| reference_audio_urls | url-list | No |
| resolution | select (480p | 720p) | No |
| duration | number | No |
| generate_audio | switch | No |
| web_search | switch | No |
| nsfw_checker | switch | No |
Output examples
Typical generation previews (actual output varies by prompt).
Preview
Performance benefits
Why teams choose this model for production workloads.
Multimodal inputs
Combine prompts with reference images, frames, or audio when the model supports them.
Predictable billing
Credits apply only on successful jobs so you can safely retry failed generations.
Features
Core capabilities for this model on the ModKie gateway.
Fast text-to-video
Lower latency than flagship video models for high-frequency shorts.
Model comparison
How this model compares to alternatives in the same family.
Seedance 2 Fast vs flagship video models
Seedance 2 Fast prioritizes lower latency and cost per clip, making it ideal for high-volume shorts and automated pipelines. Flagship models trade speed for maximum motion fidelity when quality is the top constraint.
What you can build
Common developer and product use cases for this API.
Social short-form content
Turn scripts and prompts into vertical clips for Reels, Shorts, and TikTok.
Product motion ads
Animate product stills into lightweight promo videos for ecommerce.
AI video SaaS
Embed generation behind your own UI with one Kie-compatible jobs contract.
Pricing
Credits apply per successful job only.
Seedance 2 Fast
45 credits / job
≈ $0.23 USD ($0.01 USD/credit at pack rate)
60 credits per successful job.
Quickstart
Three steps from API key to your first successful job.
- 1
Create an API key
Sign in and create a key under Settings → API Keys.
- 2
Submit createTask
POST to /api/v1/jobs/createTask with your model id and input payload.
- 3
Poll recordInfo
Poll recordInfo until the job completes; download outputs from the response.
Example createTask request
curl -X POST https://modkie.com/api/v1/jobs/createTask \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "bytedance/seedance-2-fast",
"input": {
"prompt": "A dancer spinning in slow motion under stage lights",
"aspect_ratio": "16:9",
"duration": 5,
"resolution": "720p",
"generate_audio": true,
"web_search": false,
"nsfw_checker": true
}
}'Poll GET /api/v1/jobs/recordInfo?taskId=… until state is success or fail. Credits apply only on success.
FAQ
Why ModKie for this model
ModKie is more than API relay — deploy, fine-tune, and register custom endpoints on the same gateway.
Unified gateway
One API key and jobs contract across marketplace and self-hosted models.
Playground
Validate payloads in-browser before shipping to production.
RunPod self-host
Deploy HuggingFace or custom workers and route traffic through ModKie.
Train & register
Fine-tune vision models and register weights back into the gateway.
Deployment help
Work with our team on model landing, integration, and production rollout.
Who it's for
- Developers — Ship features fast with Playground, docs, and predictable async billing.
- Enterprise teams — Standardize providers behind one contract, usage dashboard, and webhooks.
- Fine-tune & own weights — Train custom models and expose them with the same createTask flow.