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ACE-Step

POST/v1/run

Ace Step Prompt To Audio by ace - generate music, sound effects, and audio from text descriptions with AI. Create original compositions, ambient sounds, and audio content for any creative project.

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to ace/ace-step/prompt-to-audio.

Default: ace/ace-step/prompt-to-audio

stringpromptrequired

Prompt to control the style of the generated audio. This will be used to generate tags and lyrics.

Optional<integer>duration

The duration of the generated audio in seconds.

Range: 5 to 240

Default: 60

Optional<number>guidance_scale

Guidance scale for the generation.

Range: 0 to 200

Default: 15

Optional<integer>seed

Random seed for reproducibility. If not provided, a random seed will be used.

Optional<string>guidance_type

Type of CFG to use for the generation process.

Allowed values: cfg, apg, cfg_star

Default: apg

Optional<integer>granularity_scale

Granularity scale for the generation process. Higher values can reduce artifacts.

Range: -100 to 100

Default: 10

Optional<integer>number_of_steps

Number of steps to generate the audio.

Range: 3 to 60

Default: 27

Optional<number>lyric_guidance_scale

Lyric guidance scale for the generation.

Range: 0 to 10

Default: 1.5

Optional<boolean>instrumental

Whether to generate an instrumental version of the audio.

Default: false

Optional<number>tag_guidance_scale

Tag guidance scale for the generation.

Range: 0 to 10

Default: 5

Optional<number>guidance_interval_decay

Guidance interval decay for the generation. Guidance scale will decay from guidance_scale to min_guidance_scale in the interval. 0.0 means no decay.

Range: 0 to 1

Default: 0

Optional<string>scheduler

Scheduler to use for the generation process.

Allowed values: euler, heun

Default: euler

Optional<number>guidance_interval

Guidance interval for the generation. 0.5 means only apply guidance in the middle steps (0.25 * infer_steps to 0.75 * infer_steps)

Range: 0 to 1

Default: 0.5

Optional<number>minimum_guidance_scale

Minimum guidance scale for the generation after the decay.

Range: 0 to 200

Default: 3

Response Schema

The submit endpoint returns an accepted generation task. Poll the result endpoint with the returned id for terminal outputs or errors.

Optional<string>error

Error message if the task failed. Empty on success.

stringidrequired

Unique identifier for the generation task.

Optional<string>model

Model ID used for the prediction.

Optional<array>outputs

Array of generated content. Empty when status is not completed.

stringstatusrequired

Status of the task: pending, running, completed, failed, or timeout.

Allowed values: pending, running, completed, failed, timeout

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: text-to-audio

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async