Seedance API parameters: every accepted value and what it costs

Every parameter the Seedance 2.0 Fast API accepts, taken from the schema that validates your request.

Parameter	Accepted values	Notes
prompt	any non-empty string	required
duration_sec	3–15 (integers)	billed accordingly
aspect_ratio	16:9, 9:16, 1:1, 4:3, 3:4	does not affect price
resolution	720p, 1080p	720p costs half
image_inputs	array of URLs	only the first entry is used, as the start frame
seed	integer	optional, for reproducibility
negative_prompt	string	optional; support varies upstream

The constraint worth knowing first

Values outside these ranges fail validation locally, before any credits are touched.

A minimal call

curl -X POST https://genace.ai/api/v1/video/generations \
  -H "Authorization: Bearer $GENACE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"seedance-2.0-fast","prompt":"..."}'

Omitted parameters take their defaults. The default call costs 25 credits ($0.25–$0.35 depending on which pack you bought).

Naming

Request bodies accept snake_case or camelCase — duration_sec and durationSec both work. Validation errors report the camelCase name, so a complaint about durationSec refers to the duration_sec you sent. See INVALID_PARAM.

What this page does not claim

These are the parameters Genace accepts and the prices Genace charges. The upstream vendor may expose more; anything not listed here is passed through extra untouched and is not validated on our side.

Continue with models and parameters

• Flux API key: two paths, and what changes after you have one
• Flux API parameters: every accepted value and what it costs
• Flux aspect ratio options: what it accepts and what it rejects
• Browse all models and parameters guides

Models covered on this page

• Seedance 2.0