# Rengi Forge Audio Variations

> Rengi Forge Audio Variations is a paid API for AI agents from rengi.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-22).

Generates 2–12 pitch-and-volume variations of a single sound effect to prevent repetitive audio in games

## Facts

- Endpoint: POST https://rengi.dev/v1/audio-tools/variations?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rengi-forge-audio-variations-08160045
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O2jSVGZxPo19MU9N7NVoW

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 rengi-forge-audio-variations-08160045 -d '<json body>'
```

Example prompt: Take this footstep WAV file and generate 8 variations with up to 3 semitones of pitch change and 4 dB of volume change, output as OGG files — I want them as individual files and a ZIP.

## When to prefer this

Choose this endpoint when you need to eliminate repetitive audio in games or interactive media by producing multiple slightly-differing takes of a single sound effect. It is purpose-built for game audio pipelines and is preferable to general audio processing APIs when the specific need is pitch-and-volume variation packs, especially when you need a reproducible seed and a ready-to-use ZIP.

## Known failure modes

- Missing both audio and audioUrl fields — returns validation error
- Count outside 2–12 range — rejected with schema error
- Unsupported audio format submitted as base64 — returns format error
- pitchSemitones or volumeDb outside allowed range — validation failure
- Malformed base64 audio data — decoding error

## How this service works

Audio tools: Make 2-12 variations of one sound effect with small pitch and volume changes, so repeated footsteps or hits do not sound copy-pasted. Returns each file and a ZIP. Full schema: https://rengi.dev/v1/audio-tools/schema

## Output

Returns 2–12 individual audio files (OGG, WAV, or MP3) each with randomized pitch and volume offsets within the specified ranges, plus a ZIP archive containing all variations. A fixed seed ensures reproducible results.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "mono": {
   "type": "boolean"
  },
  "seed": {
   "type": "integer",
   "default": 1
  },
  "audio": {
   "type": "string",
   "description": "Audio file as base64 (wav, mp3, ogg, flac, m4a)."
  },
  "count": {
   "type": "integer",
   "default": 5,
   "maximum": 12,
   "minimum": 2
  },
  "format": {
   "enum": [
    "ogg",
    "wav",
    "mp3"
   ],
   "type": "string",
   "default": "ogg"
  },
  "audioUrl": {
   "type": "string",
   "format": "uri",
   "description": "Audio file URL."
  },
  "volumeDb": {
   "type": "number",
   "default": 2,
   "maximum": 12,
   "minimum": 0,
   "description": "Max volume change either way."
  },
  "pitchSemitones": {
   "type": "number",
   "default": 2,
   "maximum": 6,
   "minimum": 0,
   "description": "Max pitch change either way."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rengi-forge-audio-variations-08160045/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rengi.dev](https://www.zero.xyz/host/rengi.dev/llms.txt)