Seedance 2.0 Fast
prospolabs/seedance-2-fast
ByteDance's fast-tier unified audio-video model. Generates 4-15s clips at 720p with synchronized audio at no extra cost. Reference mode accepts up to 9 images, 3 videos, and 3 audio clips — compose multi-modal scenes by referencing them in the prompt as @Image1 / @Video1 / @Audio1.
Starts from
Retail $0.117
Input
Typically completes in 30–90s.
Result
IdleOr write your own prompt and hit Generate.
01overview
What is Seedance 2.0 Fast?
Seedance 2.0 Fast is ByteDance's fast-tier unified audio-video model: it turns a text prompt, a starting image, or a set of references into a 4-15 second clip at up to 720p, with synchronized audio generated in the same call. It supports three modes — text-to-video, image-to-video, and reference-to-video — and its standout feature is an @-reference system that lets you compose a scene from up to 9 images, 3 videos, and 3 audio clips cited directly in the prompt as @Image1 / @Video1 / @Audio1.
Prospolabs runs Seedance 2.0 Fast on a single pay-per-generation API with prices published in plain USD — no tokens, no subscription, and audio always included at no extra charge. You pay per second of finished video: 480p costs $0.07/sec (retail $0.117/sec, about 40% off) and 720p costs $0.15/sec (retail $0.25/sec, about 40% off). You see the exact price before you run, and the UI and API charge the same rate.
The 'Fast' tier is built for volume and iteration: it trades a sliver of the Standard tier's fidelity for roughly 2x faster turnaround and a lower per-second cost, which makes it the practical choice for social Reels and Shorts, ad-creative prototyping, and high-throughput video pipelines. If you need maximum fidelity up to 1080p, Prospolabs also offers the Seedance 2.0 Standard tier on the same API.
One honest USD-per-second price — audio included, no tokens
Most providers bury Seedance 2.0 Fast cost in opaque token systems, misleading 'per 5-second video' math, or per-second rates that creep higher in the fine print. Prospolabs publishes one number you see before you run: 480p at $0.07/sec (retail $0.117/sec, ~40% off) and 720p at $0.15/sec (retail $0.25/sec, ~40% off), with synchronized audio always free. A 5-second 720p clip is $0.75 instead of $1.25, and there are no subscriptions, no tokens, and no charge for failed runs — they're auto-refunded.
02capabilities
What Seedance 2.0 Fast can do
Native synchronized audio in one call
Seedance 2.0 Fast generates synchronized audio alongside the video in a single request — no separate sound pass, no second model. On Prospolabs, audio is always included at no extra charge, so the $0.07/sec (480p) or $0.15/sec (720p) rate already covers the soundtrack. Toggle generate_audio off only if you want a silent clip.
@-reference compositional system
Reference mode accepts up to 9 images, 3 videos, and 3 audio clips, cited inline in the prompt as @Image1, @Video1, and @Audio1. This lets you composite characters, environments, motion, and sound from multiple sources into one coherent shot.
First-frame and last-frame anchoring
In image-to-video mode you supply a starting frame and, optionally, an end frame. The model interpolates motion between them, giving you deterministic control over how a shot opens and closes — useful for product reveals, logo stings, and clip-to-clip chaining.
Up to 15-second clips
Duration is adjustable from 4 to 15 seconds in one generation, one of the longer single-call windows among fast-tier video models. Combined with multi-shot prompting, that headroom supports short narrative sequences rather than single static beats.
Seed-based reproducibility
Pass a fixed seed to reproduce a generation or to iterate on a near-identical variant; leave it random for fresh results. Seeds make Seedance 2.0 Fast practical inside automated pipelines where you need consistent, repeatable output.
480p and 720p, multiple aspect ratios
Render at 480p or 720p in the aspect ratio you need — including 9:16 for Reels and Shorts, 16:9 for landscape, and square. You only pay for the resolution you choose, so 480p drafts stay cheap and you upgrade to 720p for final delivery.
03use cases
What people build with Seedance 2.0 Fast
Social Reels and Shorts (9:16)
Generate vertical 9:16 clips with synced audio in one call, then iterate cheaply at 480p ($0.07/sec) before finalizing at 720p. The 4-15s window matches the native length of Reels, Shorts, and TikTok cuts.
Ad-creative prototyping
Spin up dozens of concept variations fast and at low cost using seeds and multi-shot prompts. Fast-tier pricing on Prospolabs means a 5-second 480p concept costs about $0.35 to test, so creative teams can explore breadth before committing budget to a hero render.
High-volume developer pipelines
Roughly 2x faster turnaround and per-second billing make Seedance 2.0 Fast a fit for backend video generation at scale. Call POST /v1/generate, poll for the output_url, and pay only for what renders — failed runs are auto-refunded on Prospolabs.
E-commerce product demos
Use image-to-video with a product photo as the starting frame, or reference mode to composite a product across a styled scene, to produce short looping demos and lifestyle clips with sound — no studio shoot required.
Multi-scene clip chaining
Anchor a last frame as the next clip's first frame to chain shots into a continuous sequence, and pull characters or motion forward with the @-reference system to keep continuity across cuts.
04api
Call Seedance 2.0 Fast from your code
Run Seedance 2.0 Fast on the Prospolabs API with a single POST to /v1/generate. The UI and API are billed at the same USD-per-second rate, audio is included, and failed runs are auto-refunded. Here's the path from zero to your first clip.
Full Seedance 2.0 Fast API reference →- 01
Create a Prospolabs account and top up your balance from as little as $5 — pay-as-you-go, no subscription or tokens.
- 02
Grab your API key from the dashboard and choose your mode: 'text' (text-to-video), 'image' (image-to-video), or 'reference' (reference-to-video).
- 03
Send POST /v1/generate with model id "seedance-2-fast", the mode field, your prompt, and parameters like resolution (480p/720p), duration (4-15s), aspect_ratio, and seed.
- 04
For image or reference mode, include the starting/end frame, or up to 9 images, 3 videos, and 3 audio clips cited in the prompt as @Image1 / @Video1 / @Audio1.
- 05
Read the returned generation_id, poll until complete, and download the output_url (valid for 7 days). See the Prospolabs API reference for copy-paste Python, JavaScript, and cURL examples.
?questions
Seedance 2.0 Fast FAQ
Both are ByteDance unified audio-video models with the same three modes and the @-reference system. Seedance 2.0 Fast is the speed/cost tier — roughly 2x faster turnaround at a lower per-second price, rendering at up to 720p with near-equal quality. Seedance 2.0 (Standard) adds higher fidelity up to 1080p. On Prospolabs, Fast is $0.07/sec (480p) and $0.15/sec (720p); Standard is $0.09/sec (480p) up to $0.41/sec (1080p). Choose Fast for high-volume, fast-iteration, cost-sensitive work; choose Standard when you need maximum fidelity.
On Prospolabs, Seedance 2.0 Fast is $0.07/sec at 480p (retail $0.117/sec, about 40% off) and $0.15/sec at 720p (retail $0.25/sec, about 40% off). Audio is always included at no extra charge. Billing is per second of finished video with no subscription and no tokens, so a 5-second 720p clip costs $0.75 and a 10-second 480p clip costs $0.70.
Yes. Seedance 2.0 Fast produces synchronized audio in the same generation as the video — no separate sound pass. Prospolabs includes that audio at no extra cost, so the published per-second rate already covers it. You can disable it with the generate_audio toggle if you want a silent clip.
It renders at 480p or 720p in a range of aspect ratios, including 9:16 for Reels and Shorts, 16:9 for landscape, and square. On Prospolabs you only pay for the resolution you select, so 480p drafts stay cheap before you finalize at 720p.
No. On Prospolabs, failed Seedance 2.0 Fast runs are automatically refunded — you only pay for video that successfully renders. There's no subscription or token system, so you top up from $5 and pay per second of completed output.
Yes. It supports three modes: text-to-video, image-to-video (supply a starting frame and optional end frame), and reference-to-video (composite from multiple media references cited in the prompt). On the Prospolabs API you select the mode via the mode field on POST /v1/generate with model id "seedance-2-fast".
Reference mode accepts up to 9 images, 3 videos, and 3 audio clips in a single generation. You cite them inline in the prompt as @Image1, @Video1, and @Audio1 to compose multimodal scenes. Audio references require at least one image or video to be present.
Prospolabs publishes one transparent USD-per-second rate — $0.07/sec at 480p and $0.15/sec at 720p, about 40% below retail, with audio included and no token markups or subscriptions. You see the exact price before you run, and failed runs are auto-refunded. Compare it on the Prospolabs price comparison page.
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