Seedance 2.5 · Start / End Frame

Learn how to use Seedance 2.5 · Start / End Frame.

Developer API pricing

Provider: SeeAPI

USD estimate: $0.0037 / credit · Estimated equivalent, not an additional charge.

480p: 34 credits/sec (≈ $0.13/sec)

720p: 74 credits/sec (≈ $0.28/sec)

1080p: 185 credits/sec (≈ $0.69/sec)

Query Task Status

After submitting a task, use the unified query endpoint to check progress and retrieve results:

Get Task DetailsLearn how to query task status and retrieve generation results

Related Resources

Market Overview

Explore all available models

Credits & Billing

View credit balance, plans, and billing activity

Usage

Review API usage and credit consumption

Callbacks

Manage the secret used to verify generation webhook signatures. Callback URLs are supplied when you create each generation.

Webhook flow

Callback URL per generation.

Webhook signing key

Request

POST/v1/generations

AuthorizationSend your API key in the Authorization header using the Bearer scheme.Authorization: Bearer ****************

Header Params

stringrequired

A unique key for this generation request. Reuse the same value only when retrying the identical request body.

max length: 255

Example:: order-20260818-001

Body Params

application/json

stringrequired

The public model ID documented on this page. Use seedance-2-5 for this Endpoint.

Allowed:seedance-2-5

Default:: seedance-2-5
Example:: seedance-2-5

stringrequired

The public Endpoint ID for the selected model. Use the Endpoint whose input schema matches this request.

Allowed:image-to-video

Default:: image-to-video
Example:: image-to-video

stringoptional

Optional public Provider ID. Omit this field to use the Endpoint's default Provider.

Allowed:seeapibyteplus

Default:: seeapi
Example:: seeapi

objectrequired

Provider-specific input object. Its accepted fields and validation rules depend on the selected provider.

Provider parameters

SeeAPIseeapiDefault Provider

stringoptional

Describe the requested video and how the supplied frame should be animated.

Recommended prompt length: no more than 500 Chinese characters or 1,000 English words.

max length: 30000

string <uri>required

Source image used as the first frame of the generated video.

Example:: https://client.example.com/input.png

string <uri>optional

Source image used as the final frame of the generated video.

stringoptional

The output ratio is adaptive for start/end frame generation.

Allowed:adaptive

Default:: adaptive

numberoptional

Choose the output duration.

Values from 4 to 30 set the requested duration in seconds.
-1 lets the model choose a suitable duration. For video editing tasks, it matches the input video's duration; for other task types, it selects a duration within the valid range.

min: 4max: 30

Default:: 5

stringoptional

Select the requested output resolution. Higher resolutions may increase processing time and credit usage.

Allowed:480p720p1080p

Default:: 480p

booleanoptional

Whether the generated video should include an audio track when this Provider supports audio generation.

Default:: true

stringoptional

Select the output video container: mp4 or mov.

Allowed:mp4mov

Default:: mp4

booleanoptional

Return the generated video last frame when available.

Default:: false

booleanoptional

Enable NSFW checker.

Default:: true

BytePlusbyteplus

stringoptional

Describe the requested video. BytePlus recommends no more than 500 Chinese characters or 1,000 English words.

string <uri>required

Accepted formats: JPEG, PNG, WebP, BMP, TIFF, GIF, HEIC, HEIF. Maximum file size: 30 MB per file.

Example:: https://client.example.com/input.png

string <uri>optional

Accepted formats: JPEG, PNG, WebP, BMP, TIFF, GIF, HEIC, HEIF. Maximum file size: 30 MB per file.

stringoptional

Start/end frame generation uses adaptive aspect ratio.

Allowed:adaptive

Default:: adaptive

numberoptional

Choose a duration from 4 to 30 seconds. Use -1 to let the model choose an integer duration from 4 to 30 seconds.

Allowed:-1456789101112131415161718192021222324252627282930min: -1max: 30

Default:: 5

stringoptional

Allowed:480p720p1080p

Default:: 480p

booleanoptional

Default:: true

stringoptional

Choose MP4 or MOV output.

Allowed:mp4mov

Default:: mp4

numberoptional

Use -1 for a random seed, or provide a fixed integer for reproducibility.

min: -1

Default:: -1

booleanoptional

Return the generated video's last frame when available.

Default:: false

string <uri>optional

Optional absolute HTTPS URL that receives terminal generation updates. If omitted, query the task-details endpoint with the returned generation ID.

max length: 2048

Example:: https://client.example.com/webhooks/seeapi

Responses

202Generation accepted and processing

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: seedance-2-5

stringrequired

Example:: image-to-video

stringrequired

Allowed:seeapibyteplus

seeapi: SeeAPI
byteplus: BytePlus

Example:: seeapi

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 170

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

200Idempotent replay of an existing generation request

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: seedance-2-5

stringrequired

Example:: image-to-video

stringrequired

Allowed:seeapibyteplus

seeapi: SeeAPI
byteplus: BytePlus

Example:: seeapi

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 170

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

400

Invalid JSON, parameters, Schema, or API Policy

401

Invalid API Key or authentication failed

402

Insufficient credits

403

The current request is not allowed

404

Model, Endpoint, or task not found

409

Idempotency conflict or the same request is still being created

413

Request body is too large

429

Too many requests

503

Service temporarily unavailable

Code Examples

Request

const response = await fetch("https://api.seeapi.com/v1/generations", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Idempotency-Key": "order-20260818-001",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
  "model": "seedance-2-5",
  "endpoint": "image-to-video",
  "provider": "seeapi",
  "input": {
    "first_frame_image": "https://client.example.com/input.png",
    "aspect_ratio": "adaptive",
    "duration_seconds": 5,
    "resolution": "480p",
    "generate_audio": true,
    "output_format": "mp4",
    "return_last_frame": false,
    "nsfw_checker": true
  },
  "callback_url": "https://client.example.com/webhooks/seeapi"
})
});

const result = await response.json();

ResponseHTTP 202

{
  "generation": {
    "id": "task_xxx",
    "model": "seedance-2-5",
    "endpoint": "image-to-video",
    "provider": "seeapi",
    "status": "processing",
    "estimated_credits": 170,
    "consumed_credits": 0,
    "refunded_credits": 0,
    "created_at": "2026-08-18T10:00:00Z",
    "updated_at": "2026-08-18T10:00:00Z"
  },
  "idempotent": false
}

const response = await fetch("https://api.seeapi.com/v1/generations", { method: "POST", headers: { "Authorization": "Bearer YOUR_API_KEY", "Idempotency-Key": "order-20260818-001", "Content-Type": "application/json" }, body: JSON.stringify({ "model": "seedance-2-5", "endpoint": "image-to-video", "provider": "seeapi", "input": { "first_frame_image": "https://client.example.com/input.png", "aspect_ratio": "adaptive", "duration_seconds": 5, "resolution": "480p", "generate_audio": true, "output_format": "mp4", "return_last_frame": false, "nsfw_checker": true }, "callback_url": "https://client.example.com/webhooks/seeapi" }) }); const result = await response.json();

{ "generation": { "id": "task_xxx", "model": "seedance-2-5", "endpoint": "image-to-video", "provider": "seeapi", "status": "processing", "estimated_credits": 170, "consumed_credits": 0, "refunded_credits": 0, "created_at": "2026-08-18T10:00:00Z", "updated_at": "2026-08-18T10:00:00Z" }, "idempotent": false }

Responses

202Generation accepted and processing

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: seedance-2-5

stringrequired

Example:: image-to-video

stringrequired

Allowed:seeapibyteplus

seeapi: SeeAPI
byteplus: BytePlus

Example:: seeapi

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 170

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

200Idempotent replay of an existing generation request

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: seedance-2-5

stringrequired

Example:: image-to-video

stringrequired

Allowed:seeapibyteplus

seeapi: SeeAPI
byteplus: BytePlus

Example:: seeapi

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 170

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

400

Invalid JSON, parameters, Schema, or API Policy

401

Invalid API Key or authentication failed

402

Insufficient credits

403

The current request is not allowed

404

Model, Endpoint, or task not found

409

Idempotency conflict or the same request is still being created

413

Request body is too large

429

Too many requests

503

Service temporarily unavailable