# BlockRun Sound Effects Generator

> BlockRun Sound Effects Generator is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.052501/call, status healthy (last checked 2026-09-14, last successful call 2026-09-15).

Generates AI-synthesized sound effects from a text description using ElevenLabs, paid per-call in USDC with no API key required

## Facts

- Endpoint: POST https://blockrun.ai/api/v1/audio/sound-effects
- Price: $0.052501/call
- Payment: x402
- Status: healthy
- Last checked: 2026-09-14
- Last successful call: 2026-09-15
- Success rate: 92% of calls made through Zero
- Rating: 4.6 / 5 from 4 reviews
- Activations on Zero: 309
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-sound-effects-generator-49226896
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iEuAJ_AtwrpQDeJu57BYZ

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 blockrun-sound-effects-generator-49226896 -d '<json body>'
```

Example prompt: Generate a 3-second sound effect of a thunderstorm with heavy rain and distant thunder rolls, returned as a wav file — use ElevenLabs sound-effects model with prompt influence set to 0.8.

## When to prefer this

Choose this endpoint when you need to programmatically generate custom sound effects from text descriptions without managing separate API keys or accounts. Ideal for AI agents that want to pay per call in USDC on Base or Solana, especially when building apps needing dynamic audio, game sound effects, or foley sounds on demand.

## Known failure modes

- Invalid duration outside 0.5–22s range returns a 400 error
- Unsupported response_format value causes a 422 validation error
- Insufficient USDC balance or failed x402 payment results in 402 Payment Required
- Vague or unrecognized text description may produce generic or unexpected audio
- Model ID not recognized returns a 400 or 404 error

## How this service works

Pay for the outcome. One endpoint for every model, tool and data source an agent needs — each call priced before it runs, at the best value per dollar. 103 models and 100 data and tool APIs.

## Output

Returns an audio file (mp3 by default, or opus/pcm/wav if specified) containing the AI-generated sound effect matching the text description, at the requested duration.

## Example request

```json
{
 "text": "A dog barking in the distance with birds chirping",
 "model": "elevenlabs/sound-effects",
 "response_format": "mp3",
 "duration_seconds": 5,
 "prompt_influence": 0.8
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "description": "Description of the sound effect to generate"
  },
  "model": {
   "type": "string",
   "description": "Sound effect model ID (elevenlabs/sound-effects)"
  },
  "response_format": {
   "type": "string",
   "description": "Audio format: mp3 (default), opus, pcm, wav"
  },
  "duration_seconds": {
   "type": "number",
   "description": "Clip length 0.5-22s (optional)"
  },
  "prompt_influence": {
   "type": "number",
   "description": "0-1 prompt adherence (optional)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-sound-effects-generator-49226896/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockrun.ai](https://www.zero.xyz/host/blockrun.ai/llms.txt)