--- title: "Seedance 2.0 Pro" description: "Seedance 2.0 Pro makes cinematic clips of 4 to 15 seconds with synchronized audio at up to 4K, from text, a first frame, or image, video and audio references. It is best for the final cut of an ad and for hero product motion on a large screen." url: https://docs.roasos.com/models/video/seedance-2-pro --- # Seedance 2.0 Pro Family `video` · model `seedance-2-pro` · catalog `model-catalog@2026-10-06.v5` · pricing `customer-pricing@2026-11-05.v15` . ## Endpoint ```http POST https://api.roasos.com/v1/video/seedance-2-pro ``` Send your API key as a bearer token. The key needs the scope `api:write`. Every paid request also needs an `Idempotency-Key` header. The envelope fields `quote_only`, `quote_id`, `webhook_url` and `wait_timeout_seconds` behave the same on each model endpoint. Refer to [Jobs](/concepts/jobs) and [Quotes and credits](/concepts/quotes-and-credits). ## Good at Seedance 2.0 Pro makes the same 4-to-15-second clips with native audio as the fast tier, at higher fidelity and up to 4K. Use it for the final render, for hero product motion, and for any shot that must hold up on a large screen. Use `/v1/video/seedance-2` for drafts and for volume; at 720p the fast tier costs about 20% less. Choose 1080p or 4K only for the final render; 4K costs about five times 720p. It does not accept a human face in a reference image, and it takes no `avatar_id`. ## Pricing The unit is one **clip**. Pricing key: `seedance-2-pro`. | Request | Credits | | ------------------ | ------- | | `4s_720p` | 15 | | `10s_720p` | 37 | | `15s_720p` | 55 | | `4s_720p_no_audio` | 15 | The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with `quote_only: true` first. ## Modes * `text-to-video` * `image-to-video` * `reference-to-video` roasOS selects the mode from the media fields of your request. You do not send a mode. Provider endpoints: `bytedance/seedance-2.0/image-to-video` · `bytedance/seedance-2.0/reference-to-video` · `bytedance/seedance-2.0/text-to-video`. ## Request fields | Field | Type | Required | Default | Rule | | ------------------------- | --------- | -------- | ---------- | ---------------------------------------------------------------------------------------------------------- | | `aspect_ratio` | enum | no | `16:9` | `9:16`, `1:1`, `3:4`, `4:3`, `16:9`, `21:9`; only in `text-to-video`, `reference-to-video` | | `audio_urls` | string\[] | no | — | ≤ 3 items; only in `reference-to-video` | | `bitrate_mode` | enum | no | `standard` | `standard`, `high`; only in `reference-to-video` | | `duration_seconds` | enum | no | `5` | `auto`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15`; required in `reference-to-video` | | `end_image_url` | string | no | — | https URL; ≤ 4,096 characters; only in `image-to-video` | | `extend_of_generation_id` | string | no | — | UUID | | `generate_audio` | boolean | no | `true` | — | | `image_url` | string | no | — | https URL; ≤ 4,096 characters; only in `image-to-video` | | `mode` | enum | no | — | `text-to-video`, `image-to-video`, `reference-to-video` | | `prompt` | string | yes | — | ≥ 1 character; ≤ 10,000 characters | | `quote_id` | string | no | — | UUID | | `quote_only` | boolean | no | `false` | — | | `references` | string\[] | no | — | ≤ 9 items; only in `reference-to-video` | | `resolution` | enum | no | `720p` | `480p`, `720p`, `1080p`, `4k` | | `scene_id` | string | no | — | UUID | | `video_urls` | string\[] | no | — | ≤ 3 items; only in `reference-to-video` | | `wait_timeout_seconds` | integer | no | `0` | 0–60 | | `webhook_url` | string | no | — | https URL; ≤ 4,096 characters | The schema is strict. A field that is not in this table gets `400 unsupported_option`. The field names are the roasOS role names. One role has one name in every family. ## Media This endpoint accepts these media roles: * `references` — style and appearance references * `image_url` — first frame (or the single source image) * `end_image_url` — last frame * `scene_id` — first frame — a scene this workspace owns * `video_urls` — reference videos * `audio_urls` — reference or driving audio | Role | Items | Maximum size | Content types | Duration | | --------------- | ----- | ------------ | --------------------------------------- | -------- | | `audio_urls` | ≤ 3 | 14.3 MB | `audio/mpeg`, `audio/wav` | — | | `end_image_url` | ≤ 1 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — | | `image_url` | ≤ 1 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — | | `references` | ≤ 9 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — | | `video_urls` | ≤ 3 | 47.7 MB | `video/mp4` | 2–15 s | Every other role is refused: `avatar_id`, `elements`, `product_id`, `product_images`, `reference_images`, `scene_image`, `video_url`, `audio_url`, `voice_id`. A refused role gets `400 unsupported_option`. Each media URL must be an immutable object on `https://cdn.roasos.com` that your workspace owns. Any other URL gets `400 reference_media_not_workspace_owned` . Refer to [Reference media and uploads](/concepts/reference-media) to learn how to put a file there. ## Prompt Limit 10,000 characters including the roasOS route-facts block (`ROUTE-VERIFIED FEATURE FACTS:` with one line for the first frame or the references). Tags: `@Image1`, `@Video1`, `@Audio1`, each once, in order. * Write the prompt as one continuous progression with plain cause-and-effect motion. * Order: Subject → Action → Camera → Style/lighting → Constraints. One primary movement per beat. * Give each beat a start time: `[00:00] … [00:05] …`. * Put quoted dialogue in the prompt when you want speech: `She says: "…"`. Name the mic source. * Dialogue pacing: 1–8 words ≈ 4–5 s, 9–15 ≈ 6–8 s, 16–25 ≈ 9–12 s. * Avoid: cinematic, professional, stunning, 8k, studio, perfect. * Do not put a face in an image reference; describe the person in words. ## Not exposed These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field. * `bitrate_mode` — pinned to `text-to-video and image-to-video; the field is sent on the reference lane only`. * `aspect_ratio` — pinned to `auto`. * `end_user_id` — not accepted by this public endpoint. * `video_urls` — these values are not available: `MOV containers`. * `references` — these values are not available: `BMP`, `TIFF`, `GIF`, `HEIC`, `HEIF`. * `avatar_id` — not accepted by this public endpoint. * `product_id` — not accepted by this public endpoint. * `seed` — pinned to `output only`. * `negative_prompt` — not accepted by this public endpoint. * `resolution` — pinned to `480p and 4k in reference-to-video with video_urls`. ## Result The result kind is `video`. Always present: `url`. ```json { "data": { "id": "gen_…", "kind": "video", "model": "seedance-2-pro", "status": "completed", "result": { "url": "https://cdn.roasos.com/workspaces/ws_01/result" } } } ``` The files are immutable objects on `https://cdn.roasos.com`. A result URL is a valid media input for your next request. ## Example The three steps are always the same: quote, run, poll. cURL JavaScript Python ```bash # 1. Quote. Nothing is spent. curl -X POST https://api.roasos.com/v1/video/seedance-2-pro \ -H "Authorization: Bearer roasos_sk_live_..." \ -H "Idempotency-Key: 0f1c9e2a-seedance-2-pro-0001" \ -H "Content-Type: application/json" \ -d '{"quote_only":true,"prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}' # 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 15, "expires_at": "...", # "confirmation": { "model": "seedance-2-pro", "example": "4s_720p" } } } # 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only. curl -X POST https://api.roasos.com/v1/video/seedance-2-pro \ -H "Authorization: Bearer roasos_sk_live_..." \ -H "Idempotency-Key: 0f1c9e2a-seedance-2-pro-0001" \ -H "Content-Type: application/json" \ -d '{"quote_id":"q_7Hk...","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}' # 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 15 } } # 3. Poll, then read the result. curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..." curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..." ``` ```javascript const key = process.env.ROASOS_API_KEY; const url = "https://api.roasos.com/v1/video/seedance-2-pro"; const idempotencyKey = "0f1c9e2a-seedance-2-pro-0001"; const input = { "prompt": "A woman holds the bottle at eye level in a bright kitchen, morning light, static camera." }; const post = (payload) => fetch(url, { method: "POST", headers: { Authorization: `Bearer ${key}`, "Idempotency-Key": idempotencyKey, "Content-Type": "application/json", }, body: JSON.stringify(payload), }).then((response) => response.json()); // 1. Quote. Nothing is spent. const quote = await post({ quote_only: true, ...input }); console.log(quote.data.credits); // 2. Run. const job = await post({ quote_id: quote.data.quote_id, ...input }); // 3. Poll, then read the result. let status = "queued"; while (status !== "completed" && status !== "failed" && status !== "canceled") { await new Promise((done) => setTimeout(done, 3000)); const poll = await fetch(`${url.split("/v1")[0]}/v1/jobs/${job.data.id}/status`, { headers: { Authorization: `Bearer ${key}` }, }).then((response) => response.json()); status = poll.data.status; } const result = await fetch(`${url.split("/v1")[0]}/v1/jobs/${job.data.id}/result`, { headers: { Authorization: `Bearer ${key}` }, }).then((response) => response.json()); console.log(result.data.result); ``` ```python import os, time, requests key = os.environ["ROASOS_API_KEY"] url = "https://api.roasos.com/v1/video/seedance-2-pro" headers = { "Authorization": f"Bearer {key}", "Idempotency-Key": "0f1c9e2a-seedance-2-pro-0001", } payload = { "prompt": "A woman holds the bottle at eye level in a bright kitchen, morning light, static camera." } # 1. Quote. Nothing is spent. quote = requests.post(url, headers=headers, json={"quote_only": True, **payload}).json() print(quote["data"]["credits"]) # 2. Run. job = requests.post(url, headers=headers, json={"quote_id": quote["data"]["quote_id"], **payload}).json() job_id = job["data"]["id"] # 3. Poll, then read the result. jobs = "https://api.roasos.com/v1/jobs" status = "queued" while status not in ("completed", "failed", "canceled"): time.sleep(3) status = requests.get(f"{jobs}/{job_id}/status", headers=headers).json()["data"]["status"] result = requests.get(f"{jobs}/{job_id}/result", headers=headers).json() print(result["data"]["result"]) ``` ## The deprecated path `POST /v1/generations` still reaches this model for one minor version. It is deprecated. This is how it maps: `POST /v1/generations { "type": "video", "model": "seedance-2-pro", "options": { prompt, image, last_frame, reference_images, reference_videos, audio_urls, duration, resolution, aspect_ratio, generate_audio } }`. Contract authority `exact`; note "Reference video mode is limited to 720p or 1080p." The alias stays one minor version after v1.1 ships. ## See also * [`llms.txt` for this model](https://docs.roasos.com/models/video/seedance-2-pro/llms.txt) — the same facts as one plain-text file for an agent. * `GET https://api.roasos.com/v1/catalog/seedance-2-pro` — the machine-readable form: enums, defaults, limits and prices. Refer to the [API reference](/api-reference/overview). * [Jobs](/concepts/jobs) — how to poll a job and read its result. * Provider endpoints: `bytedance/seedance-2.0/image-to-video` · `bytedance/seedance-2.0/reference-to-video` · `bytedance/seedance-2.0/text-to-video`.