Seedance2 API

Manage API Keys

Generate AI videos programmatically using the Seedance 2.0 model. Create text-to-video, image-to-video, keyframe, and multi-reference videos through a simple REST API.

The Seedance2 API provides programmatic access to the same Seedance 2.0 video generation capabilities available on seedance2-ai.ai. Your API usage shares the same account, credits, and task history as the web interface.

Base URL: https://seedance2-ai.ai/api/v1

Model: seedance2 or seedance2-fast

All API requests require a Bearer token in the Authorization header. You can create and manage API keys from your Account Settings.

curl -H "Authorization: Bearer YOUR_API_KEY" \
  https://seedance2-ai.ai/api/v1/account/credits

Important: Your API key is shown only once at creation. Store it securely. You can create up to 10 API keys per account.

Generate a video in two steps: create a task, then poll for the result.

# 1. Create a text-to-video task
TASK_ID=$(curl -s -X POST \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance2",
    "inputs": {
      "prompt": "A golden retriever running on the beach at sunset",
      "duration": "5s",
      "resolution": "1280x720"
    }
  }' \
  https://seedance2-ai.ai/api/v1/jobs/createTask | jq -r '.taskId')

echo "Task created: $TASK_ID"

# 2. Poll for result
while true; do
  RESULT=$(curl -s -H "Authorization: Bearer $API_KEY" \
    "https://seedance2-ai.ai/api/v1/jobs/queryTask?taskId=$TASK_ID")
  STATUS=$(echo $RESULT | jq -r '.status')
  echo "Status: $STATUS"
  if [ "$STATUS" = "COMPLETED" ] || [ "$STATUS" = "FAILED" ]; then
    echo $RESULT | jq .
    break
  fi
  sleep 5
done

POST/api/v1/jobs/createTask

Create a new video generation task

GET/api/v1/jobs/queryTask

Query task status and result

GET/api/v1/account/credits

Check your credits balance

Generate a video from a text prompt. No images required.

curl -X POST \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance2",
    "inputs": {
      "prompt": "A futuristic city with flying cars at night, neon lights reflecting on wet streets",
      "duration": "5s",
      "resolution": "1280x720"
    }
  }' \
  https://seedance2-ai.ai/api/v1/jobs/createTask

Parameter	Type	Required	Description
prompt	string	Yes	Text description of the video to generate
duration	string	No	Video length: "4s" to "15s" (default: "5s")
resolution	string	No	Aspect ratio via resolution. Options: 720x720, 720x960, 960x720, 1280x720, 720x1280, 1280x540
upscaleResolution	string	No	Upscale output: "2k" or "4k"

Animate a static image into a video. Provide one image URL as the starting frame.

curl -X POST \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance2",
    "inputs": {
      "urls": ["https://example.com/photo.jpg"],  // or "asset://asset-20260326-abc123"
      "prompt": "The woman slowly turns her head and smiles",
      "duration": "5s"
    }
  }' \
  https://seedance2-ai.ai/api/v1/jobs/createTask

Parameter	Type	Required	Description
urls	string[]	Yes	Array with one image URL (the source frame). Supports both HTTP URLs and asset references (e.g. "asset://asset-20260326-abc123")
prompt	string	No	Text description of the desired motion
duration	string	No	Video length: "4s" to "15s" (default: "5s")
upscaleResolution	string	No	Upscale output: "2k" or "4k"

Define the starting and ending frames, and the model generates the transition between them. Uses videoInputMode: "keyframe".

curl -X POST \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance2",
    "inputs": {
      "urls": [
        "https://example.com/first-frame.jpg",
        "https://example.com/last-frame.jpg"
      ],
      "prompt": "Smooth camera transition from day to night",
      "duration": "5s",
      "videoInputMode": "keyframe"
    }
  }' \
  https://seedance2-ai.ai/api/v1/jobs/createTask

Parameter	Type	Required	Description
urls	string[]	Yes	Array with exactly 2 image URLs: [first_frame, last_frame]. Supports both HTTP URLs and asset references (e.g. "asset://asset-20260326-abc123")
videoInputMode	string	Yes	Must be "keyframe"
prompt	string	No	Text description guiding the transition
duration	string	No	Video length: "4s" to "15s" (default: "5s")
upscaleResolution	string	No	Upscale output: "2k" or "4k"

Use multiple reference images, videos, and audio files to guide generation. Uses videoInputMode: "reference".

curl -X POST \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance2",
    "inputs": {
      "urls": [
        "https://example.com/ref1.jpg",
        "https://example.com/ref2.jpg"
      ],
      "videoUrls": ["https://example.com/motion-ref.mp4"],
      "audioUrls": ["https://example.com/audio.mp3"],
      "prompt": "Character walks through a garden",
      "duration": "5s",
      "videoInputMode": "reference",
      "resolution": "1280x720"
    }
  }' \
  https://seedance2-ai.ai/api/v1/jobs/createTask

Parameter	Type	Required	Description
urls	string[]	No	Reference image URLs (max 9). Supports both HTTP URLs and asset references (e.g. "asset://asset-20260326-abc123")
videoUrls	string[]	No	Reference video URLs (max 3, each ≤15s)
audioUrls	string[]	No	Reference audio URLs (max 3, each ≤15s)
videoInputMode	string	Yes	Must be "reference"
prompt	string	No	Text description
duration	string	No	Video length: "4s" to "15s" (default: "5s")
resolution	string	Yes	Required for reference mode. Options: 720x720, 720x960, 960x720, 1280x720, 720x1280, 1280x540
upscaleResolution	string	No	Upscale output: "2k" or "4k"

Reference Constraints

Max 9 images, 3 videos, 3 audio files
Max 12 total files across all types
Each video/audio must be ≤ 15 seconds
Images must be at least 400px on the shortest side

Complete reference of all inputs parameters for the seedance2 model.

Parameter	Type	Required	Description
prompt	string	No	Text description (required for text-to-video, optional for other modes)
urls	string[]	No	Image URLs. Supports both HTTP URLs and asset references (e.g. "asset://asset-20260326-abc123"). Maps to uploadedUrls internally.
videoUrls	string[]	No	Video reference URLs (reference mode only)
audioUrls	string[]	No	Audio reference URLs (reference mode only)
duration	string	No	"4s" to "15s". Default: "5s"
resolution	string	No	720x720 \| 720x960 \| 960x720 \| 1280x720 \| 720x1280 \| 1280x540
videoInputMode	string	No	"keyframe" (default) or "reference"
upscaleResolution	string	No	"2k" or "4k" for higher quality output

Top-level request fields: model (required), inputs (required), callBackUrl (optional webhook URL).

API usage consumes the same credits as the web interface. Credits are calculated based on duration and options.

Configuration	Formula	seedance2 (5s)	seedance2-fast (5s)
Base	duration_seconds × 40	200	160
+ 2K Upscale	base + duration × 20	300	260
+ 4K Upscale	base + duration × 40	400	360
Reference + Video Ref	base × 2 + upscale	400	320

Check your balance: GET /api/v1/account/credits

Instead of polling, you can provide a callBackUrl to receive results automatically when a task completes or fails.

curl -X POST \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance2",
    "callBackUrl": "https://your-server.com/webhook/seedance",
    "inputs": {
      "prompt": "A cat playing piano",
      "duration": "5s"
    }
  }' \
  https://seedance2-ai.ai/api/v1/jobs/createTask

When the task finishes, we send a POST request to your URL with the same format as the queryTask response:

// POST to your callBackUrl
{
  "taskId": "task_abc123",
  "model": "seedance2",
  "status": "COMPLETED",
  "creditsUsed": 200,
  "output": [
    {
      "url": "https://static.seedance2-pro.com/videos/result.mp4",
      "width": 1280,
      "height": 720
    }
  ],
  "error": null,
  "createTime": 1711234567890,
  "completeTime": 1711234612345
}

Retry Policy: If your endpoint returns a non-2xx status, we retry up to 3 times with increasing delays (1s, 5s, 30s).

// 200 OK
{ "taskId": "task_abc123" }

{
  "taskId": "task_abc123",
  "model": "seedance2",
  "status": "COMPLETED",     // "PENDING" | "PROCESSING" | "COMPLETED" | "FAILED"
  "creditsUsed": 200,
  "output": [                // null when status is not "COMPLETED"
    {
      "url": "https://static.seedance2-pro.com/videos/result.mp4",
      "width": 1280,
      "height": 720
    }
  ],
  "error": null,             // error message when status is "FAILED"
  "createTime": 1711234567890,
  "completeTime": 1711234612345
}

{
  "credits": 5000,
  "availableCredits": 4800
}

Status Code	Meaning	Action
400	Invalid parameters	Check the error message and fix your request
401	Invalid or missing API key	Check your Authorization header format
402	Insufficient credits	Purchase more credits at seedance2-ai.ai
403	Access denied	You can only query your own tasks
404	Task not found	Verify the taskId is correct
429	Concurrency limit (3 tasks)	Wait for existing tasks to complete
500	Internal server error	Retry after a few seconds

Complete workflow: create a task, poll for completion, and handle the result.

const API_KEY = process.env.API_KEY;
const BASE = "https://seedance2-ai.ai/api/v1";
const headers = {
  "Authorization": `Bearer ${API_KEY}`,
  "Content-Type": "application/json",
};

// Check credits first
async function checkCredits() {
  const res = await fetch(`${BASE}/account/credits`, { headers });
  return res.json();
}

// Create a task (any mode)
async function createTask(inputs, callBackUrl) {
  const res = await fetch(`${BASE}/jobs/createTask`, {
    method: "POST",
    headers,
    body: JSON.stringify({
      model: "seedance2",
      inputs,
      ...(callBackUrl && { callBackUrl }),
    }),
  });
  if (!res.ok) {
    const err = await res.json();
    throw new Error(`[${res.status}] ${err.message}`);
  }
  return res.json();
}

// Poll until done (timeout: 5 min)
async function waitForResult(taskId, timeoutMs = 300000) {
  const start = Date.now();
  while (Date.now() - start < timeoutMs) {
    const res = await fetch(
      `${BASE}/jobs/queryTask?taskId=${taskId}`,
      { headers }
    );
    const result = await res.json();

    if (result.status === "COMPLETED") return result;
    if (result.status === "FAILED") throw new Error(result.error);

    await new Promise((r) => setTimeout(r, 5000));
  }
  throw new Error("Timeout waiting for task");
}

// Example: Image to Video
async function main() {
  const { availableCredits } = await checkCredits();
  console.log(`Credits: ${availableCredits}`);

  const { taskId } = await createTask({
    urls: ["https://example.com/photo.jpg"],
    prompt: "The person slowly looks up and smiles",
    duration: "5s",
  });
  console.log(`Task: ${taskId}`);

  const result = await waitForResult(taskId);
  console.log(`Video: ${result.output[0].url}`);
}

main().catch(console.error);

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Seedance2 API

Introduction

Authentication

Quick Start

Endpoints

Text to Video

Image to Video

First & Last Frame

Multi-Reference

Parameters Reference

Credits & Pricing

Webhook Callback

Callback Payload

Response Format

createTask Response

queryTask Response

credits Response

Error Handling

Full Examples