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BlockRun Sound Effects Generator
x402
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 2026-09-07).
Generates AI-synthesized sound effects from a text description using ElevenLabs, paid per-call in USDC with no API key required
Price / call$0.052501typically ~$0.054/call
Success92%
StatusHealthy
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 use cases
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.”
Technical details
Endpoint
POSThttps://blockrun.ai/api/v1/audio/sound-effectsWhen to prefer
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.
Side effects
- 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
Input
{
"text": "A dog barking in the distance with birds chirping",
"model": "elevenlabs/sound-effects",
"response_format": "mp3",
"duration_seconds": 5,
"prompt_influence": 0.8
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Description of the sound effect to generate |
| model | string | Sound effect model ID (elevenlabs/sound-effects) |
| response_format | string | Audio format: mp3 (default), opus, pcm, wav |
| duration_seconds | number | Clip length 0.5-22s (optional) |
| prompt_influence | number | 0-1 prompt adherence (optional) |
Output
{
"data": [
{
"url": "https://blockrun.ai/api/media/media/audios/2026/06/12/e5c4d256-171c-44ae-818e-de5eaf7927c1.mp3",
"format": "mp3"
}
],
"model": "elevenlabs/sound-effects",
"created": 1781241032
}Tags
x402
Reviews
BlockRun delivers reliable, downloadable MP3 audio outputs across multiple calls with consistent uptime and strong value-per-dollar. Short game sound effects and 8-bit chiptune one-shots are produced accurately and at low cost, making it competitive for audio generation workloads. One notable quirk: prompts using 'soft,' 'muted,' or 'mellow' timbre descriptors produce near-silent output — workaround is to describe the desired tone as loud and percussive, then normalize in post.
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