Seedance 2.0

Overview

Seedance 2.0 is a ByteDance video generation model for prompt-only video, first-and-last-frame animation, and multimodal reference workflows. Use this page when you are ready to call the API after trying the model in the APIXO playground.

Capability	Value
Model ID	`seedance-2-0`
Modes	`text-to-video`, `first_and_last_frames`, `omni_reference`
Prompt	Required non-empty string
Resolutions	`480p`, `720p`, `1080p`
Durations	Any integer from `4` through `15` seconds
Aspect ratios	`auto`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16`, `21:9`
Reference images	1-2 URLs for `first_and_last_frames`; 1-9 URLs for `omni_reference`
Reference video/audio	1-3 URLs each for `omni_reference`; each file 2-15 seconds, total max 15 seconds per media type
Output	MP4 video URL array in `resultJson.resultUrls`

Endpoint and authentication

Base URL:

https://api.apixo.ai/api/v1

Method	Endpoint	Purpose
`POST`	`/generateTask/seedance-2-0`	Submit a generation task
`GET`	`/statusTask/seedance-2-0?taskId={taskId}`	Poll task status and retrieve results

All requests require your APIXO API key:

Authorization: Bearer YOUR_API_KEY

Submit requests also require:

Content-Type: application/json

Copy-paste async quickstart

This minimal request submits a text-to-video task and returns a taskId.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/seedance-2-0" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video",
      "prompt": "a cinematic tracking shot through a rainy neon street",
      "resolution": "720p",
      "duration": 5,
      "aspect_ratio": "16:9",
      "sound": true,
      "web_search": false
    }
  }'

Successful response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Save the taskId; you need it to poll for the final result.

Poll for result

curl -X GET "https://api.apixo.ai/api/v1/statusTask/seedance-2-0?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Processing response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "processing",
    "createTime": 1767965610929
  }
}

Success response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/video.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965890929,
    "costTime": 280000
  }
}

Failed response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "UPSTREAM_ERROR",
    "failMsg": "Upstream error",
    "createTime": 1767965610929,
    "completeTime": 1767965620132
  }
}

Parse resultJson after state becomes success:

const payload = JSON.parse(data.resultJson);
const videoUrls = payload.resultUrls;

Request body

Text-to-video

{
  "request_type": "async",
  "input": {
    "mode": "text-to-video",
    "prompt": "a slow tracking shot through a foggy pine forest at dawn",
    "resolution": "1080p",
    "duration": 10,
    "aspect_ratio": "16:9",
    "sound": true,
    "web_search": false
  }
}

First-and-last-frames

{
  "request_type": "async",
  "input": {
    "mode": "first_and_last_frames",
    "prompt": "turn the still frames into a smooth cinematic camera move",
    "image_urls": [
      "https://example.com/frame-start.png",
      "https://example.com/frame-end.png"
    ],
    "resolution": "720p",
    "duration": 5,
    "aspect_ratio": "9:16",
    "sound": true,
    "web_search": false
  }
}

Omni-reference

{
  "request_type": "async",
  "input": {
    "mode": "omni_reference",
    "prompt": "create a stylish product ad using the visual references and voice rhythm",
    "image_urls": [
      "https://example.com/product-shot.png"
    ],
    "video_urls": [
      "https://example.com/ref-motion.mp4"
    ],
    "audio_urls": [
      "https://example.com/ref-audio.mp3"
    ],
    "resolution": "720p",
    "duration": 6,
    "aspect_ratio": "auto",
    "sound": true,
    "web_search": false
  }
}

Parameters

request_type

string

default:"async"

Result delivery mode. Omit this field or use async for polling with statusTask, or use callback for webhook delivery.

callback_url

string

Required when request_type is callback. Must be a public HTTPS URL that can receive the final task payload. See Webhooks.

input

object

required

Seedance 2.0 input parameters.

Show properties

mode

string

required

Generation mode. Supported values: text-to-video, first_and_last_frames, omni_reference.

prompt

string

required

Text prompt describing the desired video. The backend trims whitespace and rejects empty prompts.

resolution

string

default:"720p"

Output resolution. Supported values: 480p, 720p, 1080p. Values are trimmed and normalized to lowercase.

duration

integer|string

default:"5"

Output duration in seconds. Supports integers from 4 through 15, including numeric strings such as "10".

aspect_ratio

string

default:"auto"

Output aspect ratio. Supported values: auto, 16:9, 4:3, 1:1, 3:4, 9:16, 21:9.

sound

boolean

default:"true"

Whether to generate audio with the video. Must be a boolean when provided.

web_search

boolean

default:"false"

Whether to allow real-time web search during generation. Must be a boolean when provided.

image_urls

string[]

Reference image URLs. Required for first_and_last_frames with 1-2 images. Optional for omni_reference with up to 9 images.

video_urls

string[]

Reference video URLs for omni_reference. Supports 1-3 URLs when provided. Each video must be 2-15 seconds, and total reference video duration cannot exceed 15 seconds.

audio_urls

string[]

Reference audio URLs for omni_reference. Supports 1-3 URLs when provided. Each audio file must be 2-15 seconds, and total reference audio duration cannot exceed 15 seconds.

Mode	Required media	Optional media	Billing note
`text-to-video`	None	None	Uses the no-video-reference rate.
`first_and_last_frames`	`image_urls` with 1-2 images	None	Uses the no-video-reference rate.
`omni_reference`	None by validation, unless `audio_urls` is supplied	`image_urls`, `video_urls`, `audio_urls`	Uses video-reference billing when `video_urls` is provided.

In omni_reference, audio-only requests are rejected. If you provide audio_urls, include at least one image or video reference as well.

Use public, directly accessible URLs for all reference media. Video and audio durations are checked before the task is submitted.

image_urls examples use URL strings. The backend also accepts object items with a non-empty url field and normalizes them to URL strings.

Response format

Submit task response

POST /generateTask/seedance-2-0 returns a task ID when the task is accepted:

code

integer

API status code. 200 means the task was accepted.

message

string

Human-readable status message.

data.taskId

string

Unique task identifier used with the status endpoint.

Status response fields

taskId

string

Unique task identifier.

state

string

Current task state: pending, processing, success, or failed.

resultJson

string

JSON string containing generated video URLs in resultUrls. Present when state is success.

failCode

string

Machine-readable failure code. Present when state is failed.

failMsg

string

Human-readable failure message. Present when state is failed.

createTime

integer

Task creation timestamp in Unix milliseconds.

completeTime

integer

Task completion timestamp in Unix milliseconds. Present after completion.

costTime

integer

Processing duration in milliseconds. Present after completion when timing data is available.

Webhook callback mode

Use callback mode when your backend should receive the final result automatically instead of polling.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/seedance-2-0" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/webhooks/apixo",
    "input": {
      "mode": "first_and_last_frames",
      "prompt": "turn the still frames into a smooth cinematic camera move",
      "image_urls": [
        "https://example.com/frame-start.png",
        "https://example.com/frame-end.png"
      ],
      "resolution": "720p",
      "duration": 5,
      "aspect_ratio": "9:16",
      "sound": true,
      "web_search": false
    }
  }'

The callback payload uses the same top-level shape as status polling with code, message, and data. Successful callbacks include the final state and resultJson. See Webhooks for delivery requirements and retry behavior.

Billing

Seedance 2.0 is billed per second. The selected resolution and whether omni_reference includes video_urls determine the per-second unit price.

Configuration	APIXO price
`480p`, without video reference	`$0.091 / second`
`480p`, with video reference	`$0.055 / second`
`720p`, without video reference	`$0.192 / second`
`720p`, with video reference	`$0.115 / second`
`1080p`, without video reference	`$0.49 / second`
`1080p`, with video reference	`$0.29 / second`

Formula without video reference:

total cost = output duration * unit price

Formula with video reference:

total cost = (output duration + total reference video duration) * unit price

text-to-video and first_and_last_frames always use the without-video-reference rate. omni_reference uses the with-video-reference rate only when video_urls is provided. For current route and market comparison pricing, see Pricing.

Latency and polling

Video generation is long-running. The user manual lists typical Seedance 2.0 generation time at about 4-8 minutes. Actual latency may vary by prompt complexity, duration, resolution, reference media accessibility, route queue load, and storage transfer time.

Workload	Typical generation time	Recommended first poll	Poll interval
Text-to-video or first-and-last-frames	4-8 minutes	300s after task creation	10s-20s
Omni-reference with image/video/audio inputs	4-8 minutes or longer	300s-400s after task creation	10s-20s

For production workloads, use callback mode to avoid frequent polling while video tasks run.

Result URLs are temporary. Download and store important outputs promptly after task completion. Rate limits and concurrency can vary by account, API key, and route. If you receive 429, slow down requests and retry with backoff. For account-level details, see System APIs.

Errors and troubleshooting

HTTP errors

Code	Meaning	What to do
`400`	Invalid request body, missing `input`, unsupported `mode`, missing `prompt`, invalid `resolution`, invalid `duration`, invalid `aspect_ratio`, invalid boolean value, or invalid media array	Fix the request before retrying
`401`	Missing or invalid API key	Check the `Authorization` header
`402`	Insufficient balance or quota	Add balance or switch account/key
`403`	Key or route cannot access the model	Check permissions and route strategy
`404`	Task not found when polling	Check the `taskId`
`429`	Rate limit or concurrency limit reached	Retry with exponential backoff
`500`	Server error or unknown task failure	Retry with backoff
`502`	Upstream error	Retry with backoff
`504`	Upstream timeout	Retry or use callback mode for long-running jobs

Validation notes

Condition	Backend behavior
Missing `input`	Request fails before task creation.
Missing, non-string, or empty `prompt`	Request fails before task creation.
Missing `mode`	Request fails before task creation.
Unsupported `mode`	Request fails before task creation. Supported values are `text-to-video`, `first_and_last_frames`, and `omni_reference`.
Missing `resolution`	Defaults to `720p`.
Unsupported `resolution`	Request fails before task creation. Supported values are `480p`, `720p`, and `1080p`.
Missing `duration`	Defaults to `5`.
`duration` outside `4` through `15`	Request fails before task creation.
Missing `aspect_ratio`	Defaults to `auto`.
Unsupported `aspect_ratio`	Request fails before task creation.
`sound` or `web_search` is not a boolean	Request fails before task creation.
`first_and_last_frames` without `image_urls`	Request fails before task creation.
`first_and_last_frames` with more than 2 images	Request fails before task creation.
`omni_reference` with more than 9 images, 3 videos, or 3 audio files	Request fails before task creation.
`omni_reference` with only `audio_urls`	Request fails before task creation.
Reference video or audio shorter than 2 seconds or longer than 15 seconds	Request fails before task creation.
Total reference video duration or total reference audio duration over 15 seconds	Request fails before task creation.

Task failure codes

failCode is generated from APIXO’s mapped upstream error. Common values include:

Fail code	Meaning	What to do
`SensitiveContent`	Prompt or input/output content was rejected by safety checks	Change the prompt or reference media
`PromptInvalid`	Prompt was invalid or rejected upstream	Rewrite the prompt and retry
`ImageFormatIncorrect`	Reference image format could not be processed	Use a public, direct image URL in a common image format
`RateLimited`	Upstream rate limit was reached	Retry with exponential backoff
`Timeout`	Upstream timeout	Retry later or use callback mode
`StreamError`	Upstream returned a `500`-class generation error	Retry with backoff
`Unknown error`	Upstream returned an unmapped failure	Retry with backoff or contact support with the `taskId`

See Error Codes for the full error reference.

Getting Started

Image Models

Video Models

Audio Models

Seedance 2.0

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-video

First-and-last-frames

Omni-reference

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Errors and troubleshooting

HTTP errors

Validation notes

Task failure codes

Getting Started

Image Models

Video Models

Audio Models

Documentation Index

​Overview

​Endpoint and authentication

​Copy-paste async quickstart

​Poll for result

​Request body

​Text-to-video

​First-and-last-frames

​Omni-reference

​Parameters

​Response format

​Submit task response

​Status response fields

​Webhook callback mode

​Billing

​Latency and polling

​Errors and troubleshooting

​HTTP errors

​Validation notes

​Task failure codes

​Related links

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-video

First-and-last-frames

Omni-reference

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Errors and troubleshooting

HTTP errors

Validation notes

Task failure codes

Related links