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bytedance/seedance-2.0/reference-to-video

ByteDance's Seedance 2.0 reference-to-video builds one shot from your own material: up to 9 images, 3 video clips and 3 audio tracks, with no first frame. Output is 4 to 15 seconds at 480p, 720p, 1080p or 4K, with native audio.

From $0.043/s
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Quickstart

Examples use the selected endpoint’s public parameter definitions. Replace the API key and example media, then send the request from your server.

SDKs & integrations
POSThttps://api.spicyapi.ai/api/v1/jobs/createTask

API authentication

Keep the API key in the server environment variable SPICY_API_KEY. Use Bearer authentication and Content-Type: application/json for JSON requests.

Authorization: Bearer $SPICY_API_KEY
Sample outputUse this example
# Generate the idempotency key once; reuse it when retrying after a lost response.
export SPICY_IDEMPOTENCY_KEY="${SPICY_IDEMPOTENCY_KEY:-$(uuidgen)}"
curl -X POST https://api.spicyapi.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $SPICY_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $SPICY_IDEMPOTENCY_KEY" \
  -d '{
  "model": "bytedance/seedance-2.0/reference-to-video",
  "input": {
    "aspect_ratio": "adaptive",
    "bitrate_mode": "standard",
    "duration_seconds": 5,
    "generate_audio": true,
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "resolution": "720p",
    "reference_image_urls": [
      "https://example.com/reference.png"
    ]
  }
}'

# Copy data.taskId from the response into TASK_ID, then poll the status.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.spicyapi.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $SPICY_API_KEY"

Generated from this model’s input schema — the same one the API validates every request against.

Input parameters

Place these fields inside the request body’s input object. Names and types match the API. Do not assume a default when none is specified.

This model has dependencies between fields. Fields marked conditionally required depend on other inputs; see the complete JSON Schema below for the rules.

promptstringRequired

Required, and here it also does the casting. References are cited in the order you send them, so name which image is which character, what each clip contributes and what the audio is for. Briefs are not reviewed on our side; where Seedance's own layer refuses the wording, a first frame on image-to-video is the route that still gets there.

Default
Not specified
watermarkbooleanOptional

Adds the model’s own visible "AI generated" watermark to the video. Off by default; switch it on when the place you publish requires AI-made footage to be labelled. No effect on price.

Default
false
bitrate_modestringOptional

Encoding bitrate of the delivered file: `standard` (default) or `high`. High keeps fine texture and fast motion crisper at the same resolution and makes the file much larger; resolution, frame rate and length stay the same. No effect on price.

Default
"standard"
Allowed values
"standard""high"
return_last_framebooleanOptional

Also returns the clip’s final frame as a separate image next to the video. Send it to image-to-video as the next opening frame to chain shots without exporting a still yourself. Off by default; no effect on price.

Default
false
seedintegerOptional

Integer seed; omit it and each run draws its own. Fix it with everything else held constant to judge what a prompt edit actually changed. It is a comparison tool, not a promise of frame-identical repeats.

Default
Not specified
Constraints
minimum:0
maximum:2147483647
generate_audiobooleanOptional

On by default. Produces a native soundtrack synchronized to the picture. Even with `reference_audio_urls` supplied, turning it off means no soundtrack is rendered — reference audio shapes pacing and performance, it is not the output track. Switch it off when the edit will be scored in post.

Default
true
duration_secondsintegerOptionalAffects price

4 to 15 seconds, default 5, or -1 to let the model pick the length (the estimate assumes the 15-second maximum; the charge follows the delivered length). Fifteen seconds is the ceiling of this generation; for a longer single shot, move to the 2.5 endpoint. Note that this and the length of your reference clips are two independent contributions to the billed quantity, so maxing both is where a single request gets expensive.

Default
5
Allowed values
-1456789101112131415
resolutionstringOptionalAffects price

480p, 720p, 1080p or 4k, default 720p, and it feeds the billed quantity directly. It sets the output tier only and will not sharpen low-resolution references. Test whether the references combine at a low tier, then raise it for the final take. No upscaling or enhancement tiers exist here.

Default
"720p"
Allowed values
"480p""720p""1080p""4k"
aspect_ratiostringOptional

Defaults to `adaptive`: the model finds framing that accommodates every referenced subject, which matters most when the reference assets do not share a shape. Lock a fixed ratio only for a hard delivery requirement — `9:16` for a vertical feed, for example — and check that no referenced person or product ends up cropped. No effect on billing.

Default
"adaptive"
Allowed values
"21:9""16:9""4:3""1:1""3:4""9:16""adaptive"
reference_audio_urlsarray<string>Optional

Up to 3 reference audio files, each 2 to 15 seconds long and no more than 15 seconds combined, giving the model a sonic anchor — delivery, tempo, a musical phrase — that the motion and cut points align to. Distinct from `generate_audio`: this is an input, while whether the finished clip carries a soundtrack is still decided by `generate_audio`.

Default
Not specified
Constraints
maxItems:3
reference_video_urlsarray<string>Conditionally requiredAffects price

Up to 3 reference clips, each 2 to 15 seconds long and no more than 15 seconds combined, supplying motion, pacing or camera language. The length of a reference clip counts toward the billed quantity — not as a tier switch but as a linear multiplier of the same kind as `duration_seconds` — so trim to the seconds you actually want referenced.

Default
Not specified
Constraints
maxItems:3
reference_image_urlsarray<string>Conditionally required

Up to 9 reference images, used to hold a character, a style or a set. Two or three angles of the same character usually work better than a stack of near-identical frames. This endpoint has no first- or last-frame parameter: reference mode and frame mode are mutually exclusive, so switch to image-to-video when the opening frame must be exact. Seedance's own input check may turn away a reference photo or clip that shows a real, identifiable person's face. Each side must be between 300 and 6000 pixels; a smaller plate is rejected by the input check before you are charged.

Default
Not specified
Constraints
maxItems:9

Track the task

HTTP 202 means the task was accepted, not completed. Save the returned taskId and query that task. Do not create another task while waiting for its result.

Accepted response
HTTP/1.1 202 Accepted
Location: /api/v1/jobs/recordInfo?taskId=job_01k3m8x9q2z4v7n5p6r8s0t1w3

{
  "code": 200,
  "msg": "success",
  "request_id": "req_example_create",
  "data": {
    "taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "state": "queued",
    "estimatedCost": "0.750000"
  }
}

The accepted response includes the estimate so your app can show the same amount in task history and billing.

Read the job
curl --get "https://api.spicyapi.ai/api/v1/jobs/recordInfo" \
  --data-urlencode "taskId=$TASK_ID" \
  -H "Authorization: Bearer $SPICY_API_KEY"

Start polling at about 2 seconds and gradually increase the interval. Stop at a terminal state. After a connection failure, query the original taskId. Retry creation only with the original idempotency key and body.

Or let the callback find you
import { verifyWebhook } from "@spicyapi/sdk";

// express.raw keeps the bytes we signed; express.json never matches.
app.post("/hooks/spicy", express.raw({ type: "application/json" }), (req, res) => {
  const { payload } = verifyWebhook({
    rawBody: req.body,
    timestamp: req.header("X-Webhook-Timestamp"),
    signature: req.header("X-Webhook-Signature"),
    payloadVersion: Number(req.header("X-Webhook-Payload-Version")),
    secret: process.env.SPICY_WEBHOOK_SECRET,
  });
  res.status(200).end();
  void handleFinishedTask(payload);
});

Pass callBackUrl when you create the task and the finished record is POSTed to you — no polling loop at all. Every delivery carries X-Webhook-Timestamp, X-Webhook-Signature and X-Webhook-Payload-Version. The signature is a base64 HMAC-SHA256 over taskId.timestamp.sha256(body), so it must be checked against the raw bytes: parsing the JSON and re-serialising it changes them and the check will fail. Failed deliveries are retried, so the same taskId can arrive twice — make the handler idempotent. Answer 2xx first and do the work afterwards; a slow handler is treated as a failed delivery.

Read the result

Consume output only when state is succeeded. On failure, use errorCode, errorMessage and request_id to investigate. Example costs and states do not represent an actual bill.

Completed response example
{
  "code": 200,
  "msg": "success",
  "request_id": "req_example_record",
  "data": {
    "taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "model": "bytedance/seedance-2.0/reference-to-video",
    "state": "succeeded",
    "output": {
      "assets": [
        {
          "key": "tasks/2026/08/28/job_01k3m8x9q2z4v7n5p6r8s0t1w3/3f7a1c9e5b2d48f0a6c1e3d5b7f9a1c3.mp4",
          "mime": "video/mp4",
          "url": "https://example.r2.cloudflarestorage.com/results/job_01k3m8x9q2z4v7n5p6r8s0t1w3/result.mp4?X-Amz-Signature=SIGNATURE_FROM_RESPONSE",
          "expiresAt": "2026-08-28T12:20:08.000Z"
        }
      ]
    },
    "cost": "0.750000",
    "settled": true,
    "createdAt": "2026-08-28T12:00:00Z",
    "completedAt": "2026-08-28T12:00:30Z"
  }
}

For each available asset, open or download assets[].url directly without an API Authorization header. The signed URL expires at expiresAt; poll the task again to refresh it while the asset remains within its retention period. A pending or unavailable asset has no URL. Treat signed URLs as private.

SDKs & integrations

Use SpicyAPI in your app, terminal, AI assistant or visual workflow. Choose a setup guide below.

SDKs
TypeScript · Python · Go · PHP · Java
CLI
Terminal commands and automation scripts.
MCP
Claude Code · Cursor · Codex
Agent Skill
Reusable instructions for your AI assistant.
n8n
Self-hosted community nodes and importable HTTP Request templates for n8n Cloud.
ComfyUI
Image, video and audio workflows on a node canvas.

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Use it in ComfyUI

Install the SpicyAPI nodes from ComfyUI Manager or with the command below, then search for Seedance 2.0 · Reference to Video on the canvas. The node has the same options as this page and shows its price before it runs.

cd ComfyUI/custom_nodes
git clone https://github.com/spicyapi-ai/comfyui-spicyapi
Workflow examplesSetup guideSource on GitHub