# Stability AI Audio To Audio

> Stability AI Audio To Audio is a paid API for AI agents from Stability AI at stability-ai.mpp.paywithlocus.com, paid per call via MPP, $0.23 (50 steps, stable-audio-2) (dynamic), status unknown (last checked 2026-10-10).

Transforms an input audio file using a text prompt to guide the style or character of the output audio

## Facts

- Endpoint: POST https://stability-ai.mpp.paywithlocus.com/stability-ai/audio-to-audio?utm_source=zero.xyz
- Price: $0.23 (50 steps, stable-audio-2) (dynamic)
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-10
- Success rate: 0% of calls made through Zero
- Activations on Zero: 2
- Provider: Stability AI
- Docs: https://platform.stability.ai/docs/api-reference
- Website: https://stability.ai
- Tags: image-generation, stable-diffusion, upscaling, 3d, ai, media
- Canonical page: https://www.zero.xyz/c/stability-ai-audio-to-audio-dc719cb7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pjBGGeczBPabIWlXDNJUm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability stability-ai-audio-to-audio-dc719cb7 -d '<json body>'
```

Example prompt: Take this audio file and transform it to sound like a dramatic orchestral score — use the stable-audio-2.5 model with a transformation strength of 0.8 and output it as a wav file.

## When to prefer this

Choose this endpoint when you need to restyle or transform an existing audio file guided by a natural language prompt, using Stability AI's stable-audio models. Prefer it over text-to-audio endpoints when you have a source audio file you want to preserve as a base and modify rather than generating audio from scratch.

## Known failure modes

- Missing required 'audio' field returns a 400 validation error
- Missing required 'prompt' field returns a 400 validation error
- Invalid model name (not 'stable-audio-2.5' or 'stable-audio-2') may cause a model-not-found error
- Strength value outside 0–1 range may cause a validation error
- Unsupported output_format value returns a format error
- Service unavailability or model overload returns a 503 error
- Payment failure or insufficient USDC balance prevents call execution

## How this service works

Transform an existing audio file guided by a text prompt.

## Output

Returns a transformed audio file (mp3 or wav) generated by the Stability AI stable-audio model, where the input audio has been restyled according to the text prompt with the specified transformation strength and inference steps.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "audio",
  "prompt"
 ],
 "properties": {
  "seed": {
   "type": "number",
   "description": "Random seed"
  },
  "audio": {
   "type": "string",
   "description": "Input audio file Send a public HTTPS URL (recommended; files up to 10 MiB) or base64/data URI. Hosted MPP JSON requests must stay below 8 KiB, so use a URL for larger files."
  },
  "model": {
   "type": "string",
   "description": "stable-audio-2.5 | stable-audio-2 (default)"
  },
  "steps": {
   "type": "number",
   "description": "Inference steps (default 50)"
  },
  "prompt": {
   "type": "string",
   "description": "Transformation description"
  },
  "strength": {
   "type": "number",
   "description": "Transformation intensity 0–1 (default 1)"
  },
  "output_format": {
   "type": "string",
   "description": "mp3|wav"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stability-ai-audio-to-audio-dc719cb7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stability-ai.mpp.paywithlocus.com](https://www.zero.xyz/host/stability-ai.mpp.paywithlocus.com/llms.txt)