Seedance 2.5 Edit

Endpoint

POST https://api.roasos.com/v1/video/seedance-2.5-edit

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 and Quotes and credits.

Good at

Recasting a clip of 4 to 30 seconds. Send video_url and a prompt that names the change. Add references (up to 9 images), avatar_id (the character reference sheet of a saved avatar) or product_id (the shots of a product kit). The references bind as @Image1..N in this order: your references, the product shots, the avatar.

Pricing

The unit is one source_second. Pricing key: seedance-2.5-edit.

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

• edit

Provider endpoints: bytedance/seedance-2.5/video-edit.

Request fields

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:

• avatar_id — identity; the saved character reference sheet, with a derived portrait only where the model requires a single face or source frame
• product_id — product; resolves to the product image list
• references — style and appearance references
• video_url — the source video

Every other role is refused: elements, product_images, reference_images, image_url, end_image_url, scene_id, scene_image, video_urls, audio_urls, audio_url, voice_id. A refused role gets 400 unsupported_option.

Prompt

Limit 10,000 characters. Write the change as an instruction.

• Name only what changes: "Replace the bottle in her hand with the jar from @Image1."
• Say what must stay: the performance, the camera, the cuts and the timing.
• Do not ask for a new shot or a different length.

Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

• duration_seconds — pinned to the output follows the source clip.
• aspect_ratio — pinned to the output keeps the source framing.
• seed — not accepted by this public endpoint.
• negative_prompt — not accepted by this public endpoint.
• bitrate_mode — pinned to provider default (high).
• video_urls — pinned to only the source clip is accepted.
• audio_urls — not accepted by this public endpoint.

Result

The result kind is video. Always present: url.

{
  "data": {
    "id": "gen_…",
    "kind": "video",
    "model": "seedance-2.5-edit",
    "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.

# 1. Quote. Nothing is spent.
curl -X POST https://api.roasos.com/v1/video/seedance-2.5-edit \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-seedance-2.5-edit-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.","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 15, "expires_at": "...",
#        "confirmation": { "model": "seedance-2.5-edit", "example": "4s_source_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-2.5-edit \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-seedance-2.5-edit-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.","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# 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_..."

The deprecated path

POST /v1/generations still reaches this model for one minor version. It is deprecated. This is how it maps:

POST /v1/video/seedance-2.5-edit with video_url, prompt, references, avatar_id, product_id, resolution (480p|720p|1080p) and generate_audio.

See also

• llms.txt for this model — the same facts as one plain-text file for an agent.
• GET https://api.roasos.com/v1/catalog/seedance-2.5-edit — the machine-readable form: enums, defaults, limits and prices. Refer to the API reference.
• Jobs — how to poll a job and read its result.
• Provider endpoints: bytedance/seedance-2.5/video-edit.