Seedance 1.5 Pro API

About Seedance 1.5 Pro

The Seedance 1.5 Pro API's distinctive field is camera_fixed: set it to true and the frame stays still while the subject moves. That makes it the right backend for loops, overlays and compositing plates, at a per-second price far below newer Seedance models. Image to video typically finishes in under a minute.

Call it with the model name bytedance/seedance-1.5-pro/text-to-video on POST /jobs/createTask, from 9 credits for a 5-second clip ($0.09). New accounts get 30 free credits to try it in the Playground first.

Introduction

Seedance 1.5 Pro text-to-video builds the whole frame from the prompt and renders the soundtrack in the same pass. camera_fixed decides whether the model invents a camera move or holds the frame absolutely still.

ByteDance Seedance 1.5 Pro publishes two endpoints, text-to-video and image-to-video. Both return 4 to 12 second clips at 480p, 720p or 1080p with native audio, and both carry a camera_fixed switch.

Choose a Seedance 1.5 Pro mode by starting material

Key features

camera_fixed holds the frame

Left false, the default, the model invents its own moves: a drift, a push, a slow orbit. Set it to true and the camera stops while the subject keeps moving inside the frame. A locked frame can be tracked, keyed, composited or looped, and neither Seedance 2.0 nor 2.5 offers this switch.

Sound in the same pass

generate_audio defaults to true and renders ambience, movement effects and voice locked to the frames. It moves the request into a higher rate tier, so turn it off for product loops and for plates that will be scored later.

A clear ceiling

Clips run 4 to 12 whole seconds at 480p, 720p or 1080p, in six fixed aspect ratios with 16:9 as the default and no adaptive option. There is no reference endpoint; seed is available at 480p and 720p. Jobs that need 4K, longer takes or a multi-image cast belong on Seedance 2.0 or 2.5; what 1.5 Pro keeps is the camera lock.

Request parameters

Pricing

Prices are in credits, the same credits you use on the website (1 credit = $0.01). The hold is taken when the task is accepted and settled to the actual charge when it finishes; failed tasks are refunded.

Each task is rounded up to whole credits, so one run at the lowest tier costs 9 credits for a 5-second clip ($0.09).

For an exact number before you run, send the same body to POST /jobs/quote.

Use cases

Locked shots for compositing

Set camera_fixed and describe motion that happens inside the frame. The published example is a static wide shot of hotel sheets in which only the sheets and the subject's breathing move: footage that can be keyed, tracked or looped.

A controlled prompt comparison

Lock the camera, keep every other field constant and change one clause per run: the light source, the lens, a single action. Fix seed as well (480p and 720p) and the random start stays put too; a seed is a comparison handle rather than a frame-identical guarantee, so compare a couple of takes of each version, and with the camera locked the difference belongs to the wording.

Painterly and stylised looks

The prompt sets the look as well as the action. One of this endpoint's examples asks for a chiaroscuro oil-painting treatment lit only by candles, with a very slow dolly in and camera_fixed left off.

Prompt guide & pro tips

Decide the camera first

camera_fixed is the first decision on this generation. If the result has to be tracked, keyed, looped or cut against real footage, set it to true and restate the lock in the prompt. If you want a move, leave it false and name it: a push, a pan, a tilt or an orbit.

Adapt the included example

The published example uses aspect_ratio 16:9, camera_fixed true, duration_seconds 5, generate_audio true and resolution 720p.

The lock is set in the field and repeated in the first sentence of the prompt. Every bit of motion belongs to the subject or the sheets.

API quick start

Call the Seedance 1.5 Pro API in three steps

1. Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow- and use the same credits as the website.
2. Send the request. POST /jobs/createTask with model bytedance/seedance-1.5-pro/text-to-video and an input object that follows the parameter table. The response returns a task ID straight away.
3. Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.

# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "bytedance/seedance-1.5-pro/text-to-video",
  "input": {
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "duration_seconds": 5,
    "generate_audio": true
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.

What to build with the Seedance 1.5 Pro API

• Seamless product loops for shop pages, with camera_fixed true and audio off.
• Animated backgrounds and title plates for video editors.
• A/B prompt testing with the camera and seed held constant.

Seedance 1.5 Pro parameter notes

• camera_fixed true locks the frame on all endpoints.
• duration_seconds runs 4 to 12.
• generate_audio defaults on; set false for loops.
• seed is supported, which pairs well with camera_fixed for controlled comparisons.

How Seedance 1.5 Pro API pricing adds up

Per-second billing from 480p to 1080p, where 1080p costs about four times 480p. Even at 1080p it is one of the cheapest frame-to-frame endpoints available.

• generate_audio false · resolution 480p, 5-second clip: 9 credits ($0.09) each, 900 credits ($9.00) for 100 clips
• generate_audio true · resolution 1080p, 5-second clip: 74 credits ($0.74) each, 7400 credits ($74.00) for 100 clips

Async jobs, webhooks and rate limits

Every Seedance 1.5 Pro request is asynchronous: createTask returns a taskId straight away, and the result arrives when the job finishes. Poll GET /jobs/recordInfo every few seconds, or pass a public https callBackUrl and verify the X-Webhook-Signature header (HMAC-SHA256 over taskId, timestamp and the body hash) before trusting the payload. Each account gets 1,000 write requests per 10 seconds; a 429 carries Retry-After. Send an Idempotency-Key with createTask so a retried request for bytedance/seedance-1.5-pro/text-to-video never runs or bills twice.

Common Seedance 1.5 Pro API errors

Seedance 1.5 Pro API questions

All Seedance models

Seedance 2.0 runs longer, reaches 4K and adds reference scenes, but has no camera lock.

• Seedance 2.5 APIByteDance's newest: 30-second clips with native audioFrom 56 credits for a 5-second clip
• Seedance 2.0 Mini APILightweight Seedance for quick 720p drafts with soundFrom 9 credits for a 5-second clip
• Seedance 2.0 APICinematic clips up to 4K with native audioFrom 33 credits for a 5-second clip
• Seedance 2.0 Fast APIFaster Seedance 2.0 with sound at 720pFrom 17 credits for a 5-second clip
• Seedance 1.5 Pro APINative-audio clips with an optional locked cameraFrom 9 credits for a 5-second clip

Other video APIs

• MiniMax H3 APIExpressive clips with audio, up to 2KFrom 28 credits for a 5-second clip
• LTX 2.5 APILong 20-second takes up to 4K with a soundtrackFrom 68 credits for a 5-second clip
• Wan 3.0 Prime APIQuicker Wan 3.0 renders, up to 30 seconds with audioFrom 46 credits for a 5-second clip
• Kling 3.0 API4K clips, multi-shot cuts and motion controlFrom 51 credits for a 5-second clip

More about Seedance 1.5 Pro

Try it

Seedance 1.5 Pro AI Video Generator onlineCreate videos with Seedance 1.5 Pro in PopNow

Endpoints

Seedance 1.5 Pro · Image to VideoSeedance 1.5 Pro · Extend Video

Docs

Seedance 1.5 Pro model ID and input schema in the API docsPopNow API quickstart: your first request in five minutesImage to video guide for the PopNow APIWebhooks: get Seedance 1.5 Pro results without polling