--- title: "Run Seedance 2.0 (seedance-20)" method: POST path: "/models/seedance-20" tags: ["Run a model"] --- # Run Seedance 2.0 (seedance-20) `POST /models/seedance-20` ## Request - Base URL: `https://api.hedra.com/v3` - URL: `https://api.hedra.com/v3/models/seedance-20` - Auth: one of: - API key in header `Authorization` - HTTP bearer Reference-driven video up to 4K with native audio — hold a look across shots with reference images, clips, or audio. Submits an asynchronous job and returns `202` with a job id. Fetch the result at `GET /v3/jobs/{job_id}` — each item in its `outputs[]` follows the `OutputItem` schema — or track progress via `GET /v3/jobs/{job_id}/status` / the SSE stream at `GET /v3/jobs/{job_id}/stream`. ## Headers - `Idempotency-Key` string ## Request body - SubmitBodySeedance20 - `input` union, required: Model-specific inputs for `seedance-20`. - object - `num_outputs` 1: Number of outputs generated per job. Only 1 is supported. - `prompt` string, required: Generation prompt. - `aspect_ratio` '1:1' | '3:4' | '4:3' | '16:9' | '21:9' | '9:16' | 'adaptive', required: Output aspect ratio. - `resolution` '4K' | '480p' | '720p' | '1080p', required: Output resolution. - `duration_ms` 4000 | 5000 | 6000 | 7000 | 8000 | 9000 | 10000 | 11000 | 12000 | 13000 | 14000 | 15000, required: Duration in ms. - `generate_audio` boolean: Whether to generate native audio for the video. - `start_image` union: Start frame. From 300px to 6000px on each side, with an aspect ratio from 0.4 to 2.5, and at most 30 MB. - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `end_image` union: End frame. From 300px to 6000px on each side, with an aspect ratio from 0.4 to 2.5, and at most 30 MB. - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `images` union[]: Reference images. 1 to 9 images, each from 300px to 6000px on each side, with an aspect ratio from 0.4 to 2.5, and at most 30 MB. - union - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `videos` union[]: Reference videos. 1 to 3 videos, each from 2s to 15.15s and at most 524.2 MB, at most 15.15s in total. - union - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `audios` union[]: Reference audios. 1 to 3 audio files, each at most 104.8 MB, at most 15.15s in total. - union - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `quality` 'standard': Quality level to generate at. `standard` — the full model, and the only level that reaches 1080p and 4K. `fast` — tuned for turnaround, at 480p and 720p. `mini` — the cheapest level, at 480p and 720p, with no `generate_audio` toggle. - object - `num_outputs` 1: Number of outputs generated per job. Only 1 is supported. - `prompt` string, required: Generation prompt. - `aspect_ratio` '1:1' | '3:4' | '4:3' | '16:9' | '21:9' | '9:16' | 'adaptive', required: Output aspect ratio. - `resolution` '480p' | '720p', required: Output resolution. - `duration_ms` 4000 | 5000 | 6000 | 7000 | 8000 | 9000 | 10000 | 11000 | 12000 | 13000 | 14000 | 15000, required: Duration in ms. - `generate_audio` boolean: Whether to generate native audio for the video. - `start_image` union: Start frame. From 300px to 6000px on each side, with an aspect ratio from 0.4 to 2.5, and at most 30 MB. - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `end_image` union: End frame. From 300px to 6000px on each side, with an aspect ratio from 0.4 to 2.5, and at most 30 MB. - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `images` union[]: Reference images. 1 to 9 images, each from 300px to 6000px on each side, with an aspect ratio from 0.4 to 2.5, and at most 30 MB. - union - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `videos` union[]: Reference videos. 1 to 3 videos, each from 2s to 15.15s and at most 524.2 MB, at most 15.15s in total. - union - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `audios` union[]: Reference audios. 1 to 3 audio files, each at most 104.8 MB, at most 15.15s in total. - union - object: A file uploaded via POST /v3/files, referenced by the returned url. - `source` 'url', required - `url` string, uri, required: A URL returned by POST /v3/files. - object: An existing asset you own, referenced by its id. - `source` 'asset', required - `asset_id` string, required: The asset's id (`asset_`), as issued by the server — a completed generation publishes one per output as `outputs[].asset_id`. Do not construct one or derive it from any other id. - `quality` 'fast': Quality level to generate at. `standard` — the full model, and the only level that reaches 1080p and 4K. `fast` — tuned for turnaround, at 480p and 720p. `mini` — the cheapest level, at 480p and 720p, with no `generate_audio` toggle. - `webhook` string, uri, nullable: URL to receive a signed completion webhook. ## Response `202` Accepted. The job runs asynchronously; poll `status_url` / `result_url` from the ack. - SubmitResponse - `job_id` string, required: This job's id — server-issued, and opaque. - `model` string, required: The resolved model id this job runs on. - `status` 'IN_QUEUE' | 'IN_PROGRESS' | 'COMPLETED' | 'FAILED', required: The four states a job can be in. - `status_url` string, required: Path of this job's status monitor: poll GET /v3/jobs/{job_id}/status for status, progress, and the estimated completion time. - `result_url` string, required: Path of the job resource itself: GET /v3/jobs/{job_id} returns the result envelope, including the outputs once it completes. Also the value of this response's `Location` header. - `estimated_completion_at` string, date-time, nullable: ISO-8601 instant this job is estimated to finish, as of this response. Null when no estimate is available yet, and when the job has already finished. The estimate can change while the job runs: poll `GET /v3/jobs/{job_id}/status` for the current one. ## Other responses - `400`: Invalid or failed-validation request. - `401`: Authentication failed: missing, malformed, or invalid credentials. - `402`: The API wallet cannot cover this request. `error.billing` carries the balance, the price, and where to add funds. - `403`: Insufficient scope or plan. - `404`: Resource not found. - `422`: Moderation refused the request's content. - `429`: Rate limit exceeded. - `500`: Internal error. ## Changes - **2026-10-31** `f654d6091405`: 2 info - added `subschema #3` to the `input` request property `anyOf` list - added the new `mini` enum value to the request property `input/quality` - **2026-10-16** `06692d16e78a`: 1 info - endpoint added [Operation history](https://skmtc.dev/hedra-labs/apis/hedra-api/changes/models/seedance-20/post.md) --- [API](https://skmtc.dev/hedra-labs/apis/hedra-api.md) - [All operations](https://skmtc.dev/hedra-labs/apis/hedra-api/llms.txt) - [OpenAPI document](https://skmtc.dev/hedra-labs/apis/hedra-api/revisions/6ef35a11cefe?raw)