Video

Seedance 2.0 Fast API

The Seedance 2.0 Fast API on APIMart runs ByteDance's seedance-2.0-fast model, which has the same features as standard Seedance 2.0 and generates faster. Use it for text to video, image to video, first and last frame and multimodal reference clips at 480p or 720p with native audio. One Seedance API key gives you every Seedance 2 API variant—seedance-2.0, seedance-2.0-fast and seedance-2.0-mini.

Faster GenerationText to VideoImage to Video480p / 720p

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Service Highlights

Official Discounts
Pay-as-you-go
Fast & Low Latency

Input

Model

Prompt

279 / 4000 characters

Duration5s

Aspect Ratio

Resolution

Seed

Generate Audio

Return Last Frame

Web Search

Content Moderation

Reference Image

Asset URL0/9

Image with Roles

First Frame

Last Frame

Asset URL0/2

Reference Video

Asset URL0/3

Reference Audio

Upload reference audio (requires image or video)

WAV, MP3 (max 20MB, up to 3 audios, duration ≤ 15s)

Asset URL0/3

Output

Video link valid for 72 hours

Seedance 2.0 Fast API Pricing

Transparent pricing with no hidden fees. Pay only for what you use.

Variant	Tier	GoldCurrent price	Platinum	Diamond	Official	Your savings
`seedance-2.0-fast`	480P & uploaded videos	0.2368Credits(~$0.0237)/secref. duration + gen. duration	0.225Credits(~$0.0225)/sec	0.2131Credits(~$0.0213)/sec	0.296Credits(~$0.0296)/sec	20%
	480P	0.3984Credits(~$0.0398)/sec	0.3785Credits(~$0.0378)/sec	0.3586Credits(~$0.0359)/sec	0.498Credits(~$0.0498)/sec	20%
	720P & uploaded videos	0.5128Credits(~$0.0513)/secref. duration + gen. duration	0.4872Credits(~$0.0487)/sec	0.4615Credits(~$0.0462)/sec	0.641Credits(~$0.0641)/sec	20%
	720P	0.856Credits(~$0.0856)/sec	0.8132Credits(~$0.0813)/sec	0.7704Credits(~$0.077)/sec	1.07Credits(~$0.107)/sec	20%

* Actual costs are subject to final output.

* uploaded videos pricing = (ref. duration + gen. duration) × current price

ByteDance Seedance 2.0 Fast API for Quicker AI Video Iteration

The Seedance 2.0 Fast API keeps every Seedance 2.0 feature and generates faster, so you can test prompts, references and edits in more rounds. Create 4–15 second clips at 480p or 720p from text, images, video and audio, with sound in the same pass.

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Cost Savings

Seedance 2.0 Fast API vs Seedance 1.5 Pro

Comprehensive upgrade with more powerful video generation. This comparison covers the Seedance 2.0 series; output resolutions vary by model.

Features	1.5 Pro	2.0NEW
Text to Video
Image to Video
First Frame
Last Frame
Audio Driven
Video Reference
Motion Control

Key Features of the ByteDance Seedance 2.0 Fast API

The full Seedance 2.0 feature set with faster generation, through one APIMart endpoint

Faster Generation with the Seedance 2.0 Fast Model

seedance-2.0-fast has the same features as standard Seedance 2.0 and generates faster, which shortens the wait between prompt revisions.

Seedance 2.0 Fast Text to Video API

Describe the subject, action, camera and style, and the Seedance 2.0 Fast API returns a 4–15 second clip. Prompts can be up to 4,000 characters; around 500 usually works best.

Image to Video with First and Last Frames in Seedance 2.0 Fast

Animate a still as the opening frame with the Seedance 2.0 Fast API, or pass first and last frames through image_with_roles to control how the shot starts and ends.

Multimodal References in the Seedance 2 Fast API

Combine up to 9 reference images, 3 reference videos and 3 audio clips in one Seedance 2.0 Fast API request. Audio references must be paired with an image or video.

Native Audio from the Seedance 2.0 Fast AI Video Generator

generate_audio is on by default in the Seedance 2.0 Fast API, so dialogue, effects and music come back in the same file. Set it to false for a silent clip.

480p and 720p Output with the Seedance 2.0 Fast API

The Seedance 2.0 Fast API renders 480p or 720p in 16:9, 9:16, 1:1, 4:3, 3:4, 21:9 or adaptive framing. Switch the model to seedance-2.0 when you need 1080p or 4K.

Same Parameters as Standard Seedance 2.0

The Seedance 2.0 Fast API accepts the same request body as seedance-2.0 and seedance-2.0-mini, so moving a tested prompt to the standard model only changes the model field.

Shot-to-Shot Continuity with Seedance 2.0 Fast

Set return_last_frame to true and the Seedance 2.0 Fast API returns the final frame of each clip, ready to use as the first frame of the next shot.

What You Can Build with the Seedance 2.0 Fast API

Workflows where faster Seedance 2.0 generation helps most

Prompt Testing with Seedance 2.0 Fast

Try several prompt and reference variations with the Seedance 2.0 Fast API before committing a final render to the standard model.

Social Video Ad Variations with the Seedance 2.0 Fast API

Produce several vertical and horizontal ad versions with voice and sound effects for A/B testing on TikTok, Reels and YouTube Shorts.

E-commerce Product Clips with ByteDance Seedance 2.0 Fast

Send product photos as references to the Seedance 2.0 Fast API to generate catalog videos with consistent packaging and colors.

Storyboard Previews with the Seedance 2.0 Fast Model

Turn storyboard frames into moving previews to check timing and camera moves before a full production pass.

Education & Training

Create short narrated explainer clips that combine visuals and voice in one generation.

Batch Video Pipelines with the Seedance 2 Fast API

Submit Seedance 2.0 Fast API tasks from your backend, poll the task endpoint and collect finished videos for large content batches.

How to Get a Seedance 2.0 Fast API Key and Start Building

Go from sign-up to your first Seedance 2.0 Fast video in three steps

Get Your Seedance 2.0 Fast API Key

→

Test Seedance 2.0 Fast in the Playground

Try Seedance 2.0 Fast API prompts, reference images and settings on this page to find what fits your project.

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Integrate the Seedance 2.0 Fast API into Your App

Follow the API documentation to send Seedance 2.0 Fast requests from your backend and poll task results.

Start Creating

Seedance 2.0 Fast API Example: Text to Video and Image to Video

Call ByteDance Seedance 2.0 Fast on APIMart with one POST request. Generation is asynchronous: submit a task, then poll the task endpoint to get the video URL.

1
Authenticate Seedance 2.0 Fast API requests
Save the key you created above in the APIMART_API_KEY environment variable and send it as Authorization: Bearer <key> on every Seedance 2.0 Fast API request.
2
Submit a Seedance 2.0 Fast task
POST /v1/videos/generations with model seedance-2.0-fast, your prompt, size, resolution and duration. Add image_urls for image to video, or video_urls and audio_urls for references. The response contains the task ID in data[0].task_id.
3
Get the Seedance 2.0 Fast result
Poll GET /v1/tasks/{task_id} until status is completed, then read the video URL from data.result.videos[0].url[0]. If the task fails, the reason is returned in data.error.message.
See the Seedance 2.0 API reference for every parameter, scenario and response field.

POST /v1/videos/generations

curl -X POST https://api.apimart.ai/v1/videos/generations \
  -H "Authorization: Bearer $APIMART_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance-2.0-fast",
    "prompt": "A cinematic tracking shot of a red vintage car driving along a coastal road at sunset, waves crashing below, warm golden light",
    "size": "16:9",
    "resolution": "720p",
    "duration": 5
  }'

import os
import time
import requests

API_BASE = "https://api.apimart.ai"
headers = {"Authorization": f"Bearer {os.environ['APIMART_API_KEY']}"}

# 1. Submit the generation task
payload = {
  "model": "seedance-2.0-fast",
  "prompt": "A cinematic tracking shot of a red vintage car driving along a coastal road at sunset, waves crashing below, warm golden light",
  "size": "16:9",
  "resolution": "720p",
  "duration": 5
}
resp = requests.post(f"{API_BASE}/v1/videos/generations", headers=headers, json=payload, timeout=60)
resp.raise_for_status()
task_id = resp.json()["data"][0]["task_id"]

# 2. Poll the task until it finishes
for _ in range(200):
    task_resp = requests.get(f"{API_BASE}/v1/tasks/{task_id}", headers=headers, timeout=30)
    task_resp.raise_for_status()
    task = task_resp.json()["data"]
    if task["status"] == "completed":
        print(task["result"]["videos"][0]["url"][0])
        break
    if task["status"] == "failed":
        raise RuntimeError(task.get("error", {}).get("message", "generation failed"))
    time.sleep(10)
else:
    raise TimeoutError(f"task {task_id} did not finish in time")

curl -X POST https://api.apimart.ai/v1/videos/generations \
  -H "Authorization: Bearer $APIMART_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance-2.0-fast",
    "prompt": "The woman in the photo turns toward the camera and smiles as the wind moves her hair, slow push-in, soft daylight",
    "image_urls": [
      "https://example.com/portrait.jpg"
    ],
    "resolution": "720p",
    "duration": 5
  }'

TASK_ID="task_xxx"  # replace with the task_id returned by the POST request
curl "https://api.apimart.ai/v1/tasks/$TASK_ID" \
  -H "Authorization: Bearer $APIMART_API_KEY"

Seedance 2.0 Fast API Parameters

Parameter	Type	Required	Default	Description
`model`	string	Required	Default: seedance-2.0-fast	Use seedance-2.0-fast for faster generation. The same request also works with seedance-2.0 and seedance-2.0-mini.
`prompt`	string	Optional	Default: —	Seedance 2.0 Fast API video description. Required for text to video and optional when you pass images or reference video. Up to 4,000 characters; around 500 is recommended.
`duration`	integer	Optional	Default: 5	Clip length from 4 to 15 seconds.
`size`	string	Optional	Default: 16:9	16:9, 9:16, 1:1, 4:3, 3:4, 21:9 or adaptive (matches the input image or video).
`resolution`	string	Optional	Default: 720p	480p or 720p. 1080p and 4k are only available on seedance-2.0, not on seedance-2.0-fast.
`seed`	integer	Optional	Default: —	Random seed. The same seed with the same request gives similar, but not identical, results.
`generate_audio`	boolean	Optional	Default: true	Generate synchronized audio. Set false for a silent video.
`return_last_frame`	boolean	Optional	Default: false	Also return the URL of the last frame, for chaining clips into longer videos.
`image_urls`	array	Optional	Default: —	Up to 9 image URLs or asset:// IDs for Seedance 2.0 Fast API image to video. Cannot be used together with image_with_roles.
`image_with_roles`	array	Optional	Default: —	Images with a role: first_frame, last_frame or reference_image (a reference portrait, used with an approved asset:// URL). Reference video and audio are not available with first and last frames.
`video_urls`	array	Optional	Default: —	Up to 3 Seedance 2.0 Fast API reference videos, total length between 1.8 and 15.2 seconds, 480p to 720p.
`audio_urls`	array	Optional	Default: —	Up to 3 reference audio clips, 15 seconds in total. Must be used with a reference image or video.
`tools`	array	Optional	Default: —	Optional tools. [{"type": "web_search"}] lets the model reference web information during generation.
`nsfw_check`	boolean	Optional	Default: false	Check the prompt and images before submission. Flagged requests return HTTP 400 and no task is created.

User Reviews for Seedance 2.0

Real feedback from creators and developers using Seedance 2.0 worldwide. These reviews describe experiences with the Seedance 2.0 series.

“The visual quality of Seedance 2.0 is incredible! The motion is so smooth and natural, it really elevates my content.”

Sarah Kim

Content Creator

“As a developer, I appreciate the clean API and fast response times. Seedance 2.0 integrates seamlessly into our pipeline.”

Alex Wang

Full-Stack Engineer

Seedance API Model Family

Compare every Seedance video model on APIMart. One API key calls all of them; each model page shows its live pricing.

Model	Best for	Resolution	Duration
Seedance 2.5 API	Clips up to 30 s with up to 50 image, video and audio references, plus video editing and extension	480P / 720P / 1080P	4–30 s or auto
Seedance 2.0 API	Up to 4K, the highest resolution in the family, with image, video and audio references	480P / 720P / 1080P / 4K	4–15 s
Seedance 2.0 Fast APIThis page	Fast variant of Seedance 2.0 with the same image, video and audio references	480P / 720P	4–15 s
Seedance 2.0 Mini API	Mini variant of Seedance 2.0 with the same image, video and audio references	480P / 720P	4–15 s
Seedance 1.5 Pro API	Text-to-video and first/last-frame image-to-video, with optional audio	480P / 720P / 1080P	4–12 s
Seedance 1.0 Pro Quality API	Text-to-video and first/last-frame image-to-video	480P / 720P / 1080P	2–12 s
Seedance 1.0 Pro Fast API	Text-to-video and first-frame image-to-video (no last frame)	480P / 720P / 1080P	2–12 s

Seedance 2.0 Fast API FAQ

Answers about Seedance 2.0 Fast API capabilities, parameters and access

What is Seedance 2.0 Fast?

Seedance 2.0 Fast is the faster version of ByteDance Seed's Seedance 2.0 video model. It has the same features as standard Seedance 2.0 and generates faster, with output at 480p or 720p. On APIMart, the Seedance 2.0 Fast API uses the model ID seedance-2.0-fast.

Seedance 2.0 vs Seedance 2.0 Fast: what's the difference?

Both models accept the same parameters, inputs and 4–15 second durations. Seedance 2.0 Fast generates faster and outputs 480p or 720p, while the standard Seedance 2.0 API also offers 1080p and 4K. A common pattern is to iterate with the Seedance 2.0 Fast API and render final versions with seedance-2.0.

How do I use the Seedance 2.0 Fast API?

Send POST /v1/videos/generations with model seedance-2.0-fast and your prompt. The Seedance 2.0 Fast API runs as an asynchronous task: read the task ID from data[0].task_id, poll GET /v1/tasks/{task_id} until the status is completed, then read the video URL from data.result.videos[0].url[0]. The example on this page shows the full flow in cURL and Python.

Seedance 2.0 Fast vs Seedance 1.5 Pro: what's new?

Seedance 2.0 Fast keeps the core workflows of Seedance 1.5 Pro—text to video, image to video, and first and last frame control—and adds the Seedance 2.0 multimodal features: audio-driven generation and video reference, with up to 9 reference images, 3 reference videos and 3 reference audio clips per request. Clips run 4–15 seconds instead of 4–12. Seedance 2.0 Fast outputs 480p or 720p, while Seedance 1.5 Pro goes up to 1080p; for 1080p or 4K with the Seedance 2.0 features, use the Seedance 2.0 API.

What parameters does the Seedance 2.0 Fast API support?

In the Seedance 2.0 Fast API, model is required, and prompt is required for text to video. Optional parameters are duration (4–15 seconds, default 5), size (default 16:9), resolution (480p or 720p, default 720p), seed, generate_audio (default true), return_last_frame, image_urls, image_with_roles, video_urls, audio_urls, tools for web search and nsfw_check.

How long are Seedance 2.0 Fast videos, and which resolutions and aspect ratios are supported?

The Seedance 2.0 Fast API generates clips from 4 to 15 seconds at 480p or 720p. Aspect ratios are 16:9, 9:16, 1:1, 4:3, 3:4, 21:9 and adaptive, which follows the input image or video.

Does the Seedance 2.0 Fast API support image to video and first and last frames?

Yes. Pass a picture in image_urls and the Seedance 2.0 Fast API uses it as the opening frame, or use image_with_roles with first_frame and last_frame to fix both ends of the clip. image_urls and image_with_roles cannot be combined, and first- and last-frame tasks cannot include reference video or audio.

Does Seedance 2.0 Fast support audio and reference video?

Yes. The Seedance 2.0 Fast API adds synchronized sound by default through generate_audio. You can also send up to 3 reference videos (total length between 1.8 and 15.2 seconds, 480p to 720p) and up to 3 reference audio clips (15 seconds in total) that must be paired with a reference image or video.

How do I write effective Seedance 2.0 Fast prompts?

For the Seedance 2.0 Fast API, name the subject, the action, the camera move and the visual style, and describe sound or dialogue when audio is on. Keep prompts around 500 characters, and change one element at a time between fast test runs so you can see what each change does.

Which Seedance 2.0 variant should I choose?

Both seedance-2.0-fast and seedance-2.0-mini output 480p or 720p video, while the standard seedance-2.0 model also offers 1080p and 4K. All three accept 4–15 second durations and are billed by resolution, so the Seedance 2.0 price differs per variant—compare prices on each model's page and test each one in its playground before you scale up.

Seedance 2.0 Fast pricing: how much does the Seedance 2.0 Fast API cost?

Prices use the selected model and resolution’s original price and actual discount. Without a reference video, the estimate is based on output duration. With a reference video, the input tier covers reference plus output duration; unknown reference duration is shown as a range.

Is the Seedance 2.0 Fast API free?

No. There is no free quota for the Seedance 2.0 Fast API on APIMart. Billing is pay-as-you-go and you only pay for successful requests. Members save 20%–28%: Gold members get 20% off, and Platinum and Diamond members up to 28%. See this page's live pricing table for current prices.

How do I get a Seedance 2.0 Fast API key?

Sign up for APIMart, open the API Keys page in your dashboard and create a key. The same key calls the ByteDance Seedance 2.0 Fast API and every other model on the platform, with pay-as-you-go billing and no subscription.

Where can I get access to Seedance 2.0 Fast?

You can access ByteDance Seedance 2.0 Fast directly through the Seedance API on APIMart: create an account, generate an API key, and send requests with the model ID seedance-2.0-fast. If your code comes from a platform that names it bytedance/seedance-2.0-fast, switch the model field to seedance-2.0-fast and check the APIMart docs for parameters.

Related Models

Explore more models in the same category.

View All Models →

Seedance 2.0 Fast API FAQ

Answers about Seedance 2.0 Fast API capabilities, parameters and access

What is Seedance 2.0 Fast?

Seedance 2.0 vs Seedance 2.0 Fast: what's the difference?

How do I use the Seedance 2.0 Fast API?

Seedance 2.0 Fast vs Seedance 1.5 Pro: what's new?

What parameters does the Seedance 2.0 Fast API support?

How long are Seedance 2.0 Fast videos, and which resolutions and aspect ratios are supported?

The Seedance 2.0 Fast API generates clips from 4 to 15 seconds at 480p or 720p. Aspect ratios are 16:9, 9:16, 1:1, 4:3, 3:4, 21:9 and adaptive, which follows the input image or video.

Seedance 2.0 Fast API

Seedance 2.0 Fast API Pricing

ByteDance Seedance 2.0 Fast API for Quicker AI Video Iteration

Seedance 2.0 Fast API vs Seedance 1.5 Pro

Key Features of the ByteDance Seedance 2.0 Fast API

What You Can Build with the Seedance 2.0 Fast API

How to Get a Seedance 2.0 Fast API Key and Start Building

Get Your Seedance 2.0 Fast API Key

Test Seedance 2.0 Fast in the Playground

Integrate the Seedance 2.0 Fast API into Your App

Seedance 2.0 Fast API Example: Text to Video and Image to Video

Authenticate Seedance 2.0 Fast API requests

Submit a Seedance 2.0 Fast task

Get the Seedance 2.0 Fast result

Seedance 2.0 Fast API Parameters

User Reviews for Seedance 2.0

Seedance API Model Family

Seedance 2.0 Fast API FAQ

What is Seedance 2.0 Fast?

Seedance 2.0 vs Seedance 2.0 Fast: what's the difference?

How do I use the Seedance 2.0 Fast API?

Seedance 2.0 Fast vs Seedance 1.5 Pro: what's new?

What parameters does the Seedance 2.0 Fast API support?

How long are Seedance 2.0 Fast videos, and which resolutions and aspect ratios are supported?

Does the Seedance 2.0 Fast API support image to video and first and last frames?

Does Seedance 2.0 Fast support audio and reference video?

How do I write effective Seedance 2.0 Fast prompts?

Which Seedance 2.0 variant should I choose?

Seedance 2.0 Fast pricing: how much does the Seedance 2.0 Fast API cost?

Is the Seedance 2.0 Fast API free?

How do I get a Seedance 2.0 Fast API key?

Where can I get access to Seedance 2.0 Fast?

Related Models

Seedance 2.0 Fast API vs Seedance 1.5 Pro

Key Features of the ByteDance Seedance 2.0 Fast API

What You Can Build with the Seedance 2.0 Fast API

How to Get a Seedance 2.0 Fast API Key and Start Building

Get Your Seedance 2.0 Fast API Key

Test Seedance 2.0 Fast in the Playground

Integrate the Seedance 2.0 Fast API into Your App

User Reviews for Seedance 2.0

Seedance 2.0 Fast API FAQ

What is Seedance 2.0 Fast?

Seedance 2.0 vs Seedance 2.0 Fast: what's the difference?

How do I use the Seedance 2.0 Fast API?

Seedance 2.0 Fast vs Seedance 1.5 Pro: what's new?

What parameters does the Seedance 2.0 Fast API support?

How long are Seedance 2.0 Fast videos, and which resolutions and aspect ratios are supported?

Does the Seedance 2.0 Fast API support image to video and first and last frames?

Does Seedance 2.0 Fast support audio and reference video?

How do I write effective Seedance 2.0 Fast prompts?

Which Seedance 2.0 variant should I choose?

Seedance 2.0 Fast pricing: how much does the Seedance 2.0 Fast API cost?

Is the Seedance 2.0 Fast API free?

How do I get a Seedance 2.0 Fast API key?

Where can I get access to Seedance 2.0 Fast?

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