Use Dreamina Seedance 2.0 Fast 260128 with Comfy Router

Call byteplus/dreamina-seedance-2-0-fast-260128 through Comfy Router: endpoint, request shape and the response Router returns.

Use byteplus/dreamina-seedance-2-0-fast-260128 with the Comfy Router API. BytePlus provides the model; Router gives it the shared authentication and request route below.

Quick start

Create a key at platform.comfy.org/profile/api-keys and export it as COMFY_API_KEY. The Python and TypeScript snippets use the Comfy SDKs (pip install comfy-sdk, npm install @comfyorg/sdk); the cURL snippet is the same call over raw HTTP.

Model ID: byteplus/dreamina-seedance-2-0-fast-260128

Endpoint: POST https://api.comfy.org/v2/models/byteplus/dreamina-seedance-2-0-fast-260128

Python

import uuid
from comfy_sdk import Comfy

# Reads COMFY_API_KEY from the environment. Save this key and reuse it if you
# retry this request after the SDK returns an error.
idempotency_key = str(uuid.uuid4())
with Comfy() as client:
    result = client.models.run(
        "byteplus/dreamina-seedance-2-0-fast-260128",
        {
            # Request fields are the provider's own — see Input below.
        },
        idempotency_key=idempotency_key,
    )

print(result)

Schema

Input

Router has not published an authored input schema for this model yet: GET /v2/models/byteplus/dreamina-seedance-2-0-fast-260128/openapi.json returns an open object with x-comfy-input-schema-authored: false. Router forwards the body to BytePlus unchanged, so BytePlus’s own API reference is authoritative for the request fields, and nothing is validated server side.

Output

content · object

The output after the video generation task is completed, which contains the download URL of the output video and, when BytePlus returns one, the download URL of its last frame. Both video_url and last_frame_url are RE-HOSTED onto Comfy storage; every other field here is BytePlus’s own. Nullable - BytePlus clears the URLs 24 hours after the task, and a succeeded document polled after that can carry content absent or null.

content.last_frame_url · string

Download URL for the last frame of the generated video, returned when the request set return_last_frame. Do not infer the image format from this URL: BytePlus documents the last frame as PNG on the request side, Router re-hosts whatever bytes it is served and types them from the upstream Content-Type or a content sniff, and image/jpeg is only the last-resort fallback when both fail. Router re-hosts the last frame onto Comfy storage and rewrites this field, so it is normally a Comfy-signed URL valid for up to 24 hours - signed for 24 hours when minted and replayed from a 23-hour memo, so a later poll can hand back one with as little as an hour left. When the re-host could not be performed the field keeps BytePlus’s own URL instead, which BytePlus clears 24 hours after the task. Either way the link expires, so download the frame rather than storing the URL.

content.output_format · string

Container format of the generated video (mp4 or mov), when BytePlus nests it inside content. Seedance models more commonly return it as a TOP-LEVEL sibling of content - see the top-level output_format field - and Router reads whichever of the two is present.

content.video_url · string

Download URL for the output video. Router re-hosts the video onto Comfy storage and rewrites this field, so it is normally a Comfy-signed URL valid for up to 24 hours - signed for 24 hours when minted and replayed from a 23-hour memo, so a later poll can hand back one with as little as an hour left. When the re-host could not be performed the field keeps BytePlus’s own URL instead, which BytePlus clears 24 hours after the task and caps at 100 downloads on some models. Either way the link expires, so download the video rather than storing the URL.

created_at · integer

The time when the task was created. The value is a UNIX timestamp in seconds.

duration · number

The duration of the generated video in seconds. Declared as a number rather than an integer because BytePlus is not consistent about it - video tasks have been observed returning whole seconds and sibling BytePlus surfaces report fractional durations - so a client must not assume an integral value. BytePlus’s own field, returned on succeeded video tasks and forwarded unchanged.

error · object

The error information. If the task succeeds, null is returned. If the task fails, the error information is returned.

error.code · string

The error code

error.message · string

The error message

id · string

The ID of the video generation task

model · string

The name and version of the model used by the task

output_format · string

Container format of the generated video (mp4 or mov), returned at the TOP LEVEL as a sibling of content - this is where the Seedance video task query returns it. BytePlus’s own field, forwarded unchanged.

resolution · string

The resolution of the generated video, for example 1080p. BytePlus’s own field, returned on succeeded video tasks and forwarded unchanged.

seed · integer

The generation seed actually used for the task. BytePlus’s own field, returned on succeeded video tasks and forwarded unchanged.

Format: int64

status · string

The state of the task

Possible values: queued, running, cancelled, succeeded, failed, expired

updated_at · integer

The time when the task was last updated. The value is a UNIX timestamp in seconds.

usage · object

The token usage for the request

usage.completion_tokens · integer

The number of tokens generated by the model

usage.total_tokens · integer

For the video generation model, the number of input tokens is not calculated and defaults to 0. Therefore, total_tokens = completion_tokens.

Examples

Output

{
  "content": {
    "last_frame_url": "https://example.invalid/byteplus/seedance-1-0-lite-t2v-250428/last-frame",
    "video_url": "https://example.invalid/byteplus/seedance-1-0-lite-t2v-250428/generated.mp4"
  },
  "created_at": 1767225600,
  "duration": 5,
  "error": null,
  "id": "3f7a1b28-5c0d-4e91-8a6f-1b2c3d4e5f60",
  "model": "seedance-1-0-lite-t2v-250428",
  "output_format": "mp4",
  "resolution": "1080p",
  "seed": 1234567890123,
  "status": "succeeded",
  "updated_at": 1767225730
}

Before you ship

Save one Idempotency-Key for each call and reuse it for retries. Router can hold the connection for up to 10 minutes. The SDKs handle authentication; raw HTTP clients send the headers themselves.

Use X-Comfy-Error-Type to classify a failure. A 422 means Router rejected the input before calling the provider. Download generated assets promptly because result URLs can expire.

Headers

Authentication, idempotency, request IDs, error buckets, retry pacing, spend limits.

Using the Router API

Find models, inspect schemas, and retry safely.

Limitations

What Router does not do today, and what to use instead.