Audio

Stable Audio 3 Base Extend

Credit-based pricing.

Try Stable Audio 3 Base Extend →Compare models

Output

audio

Inputs

Reference audio (required)

Example prompt

Continue into a natural instrumental outro with a clean cadence

Try this prompt →

LLM-ready

API & LLM schema

Exact request contract for this model. Agents can fetch it from /api/v1/models?id=fal-ai/stable-audio-3/medium/base/audio-outpainting.

POST/api/v1/generate18 fields · 3 required

Field	Type	Requirement	Contract
`model_id`	constant	Required	ArtEmotion model identifier.
`extra`	object	Optional	Model-specific settings may also be nested here.
`max_credits`	number	Optional	Reject before submission if the estimated list price exceeds this cap. · Range: 1–…
`webhook_url`	string	Optional	Format: uri
`webhook_secret`	string	Optional	Optional model input.
`folder_id`	string	Optional	Optional model input.
`prompt`	string	Required	Optional model input.
`extend_seconds_before`	number	Optional	Default: 0 · Range: 0–379
`extend_seconds_after`	number	Optional	Default: 30 · Range: 0–379
`negative_prompt`	string	Optional	Default:
`num_inference_steps`	number	Optional	Default: 50 · Range: 1–100
`guidance_scale`	number	Optional	Default: 7 · Range: 0–25
`output_format`	string	Optional	Allowed: mp3, wav, flac, ogg, opus, m4a, aac · Default: mp3
`bitrate`	string	Optional	Allowed: 192k, 320k · Default: 192k
`seed`	integer	Optional	Optional model input.
`enable_prompt_expansion`	boolean	Optional	Default: true
`enable_safety_checker`	boolean	Optional	Default: true
`audio_url`	string	Required	Format: uri

Minimal request example

{
  "model_id": "fal-ai/stable-audio-3/medium/base/audio-outpainting",
  "prompt": "Continue into a natural instrumental outro with a clean cadence",
  "audio_url": "https://example.com/audio"
}

Raw JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.artemotion.ai/api/v1/models?id=fal-ai%2Fstable-audio-3%2Fmedium%2Fbase%2Faudio-outpainting",
  "title": "Stable Audio 3 Base Extend generation request",
  "description": "Request body accepted by POST /api/v1/generate for fal-ai/stable-audio-3/medium/base/audio-outpainting.",
  "type": "object",
  "properties": {
    "model_id": {
      "type": "string",
      "const": "fal-ai/stable-audio-3/medium/base/audio-outpainting",
      "description": "ArtEmotion model identifier."
    },
    "extra": {
      "type": "object",
      "additionalProperties": true,
      "description": "Model-specific settings may also be nested here."
    },
    "max_credits": {
      "type": "number",
      "minimum": 1,
      "description": "Reject before submission if the estimated list price exceeds this cap."
    },
    "webhook_url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048
    },
    "webhook_secret": {
      "type": "string",
      "maxLength": 512
    },
    "folder_id": {
      "type": "string"
    },
    "prompt": {
      "type": "string"
    },
    "extend_seconds_before": {
      "title": "Add Before (s)",
      "default": 0,
      "type": "number",
      "minimum": 0,
      "maximum": 379,
      "multipleOf": 1
    },
    "extend_seconds_after": {
      "title": "Add After (s)",
      "default": 30,
      "type": "number",
      "minimum": 0,
      "maximum": 379,
      "multipleOf": 1
    },
    "negative_prompt": {
      "title": "Avoid",
      "default": "",
      "type": "string"
    },
    "num_inference_steps": {
      "title": "Inference Steps",
      "default": 50,
      "type": "number",
      "minimum": 1,
      "maximum": 100,
      "multipleOf": 1
    },
    "guidance_scale": {
      "title": "Guidance",
      "default": 7,
      "type": "number",
      "minimum": 0,
      "maximum": 25,
      "multipleOf": 0.5
    },
    "output_format": {
      "title": "Output Format",
      "default": "mp3",
      "type": "string",
      "enum": [
        "mp3",
        "wav",
        "flac",
        "ogg",
        "opus",
        "m4a",
        "aac"
      ]
    },
    "bitrate": {
      "title": "Bitrate",
      "default": "192k",
      "type": "string",
      "enum": [
        "192k",
        "320k"
      ]
    },
    "seed": {
      "title": "Seed",
      "type": "integer"
    },
    "enable_prompt_expansion": {
      "title": "Prompt Expansion",
      "default": true,
      "type": "boolean"
    },
    "enable_safety_checker": {
      "title": "Safety Checker",
      "default": true,
      "type": "boolean"
    },
    "audio_url": {
      "type": "string",
      "format": "uri"
    }
  },
  "required": [
    "model_id",
    "prompt",
    "audio_url"
  ],
  "additionalProperties": false
}

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FAQ

How much does Stable Audio 3 Base Extend cost on ArtEmotion?

Credit-based pricing. You pay in ArtEmotion credits — every plan and top-up converts USD to credits at a fixed rate.

Do I get my credits back if Stable Audio 3 Base Extend fails?

Yes — failed generations are never charged. The credits are released back to your balance automatically.

Can I call Stable Audio 3 Base Extend from the API?

Yes. Use POST /api/v1/generate with model_id: "fal-ai/stable-audio-3/medium/base/audio-outpainting". See the API reference for the full schema.

Where are my generations stored?

Every output is saved to your personal Library. You can export or delete everything any time from Privacy & deletion.

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