Sound effects
LiveDescribe a sound. Get it back as audio in the same response: footsteps on gravel, heavy rain, a door slam, a whoosh, up to 22 seconds long.
How it works
- 01Describe the soundWhat it is and how it should feel, up to 1,000 characters.
- 02We make itOne sound, as long as you ask for.
- 03Get the audioMP3, WAV or Opus, in the same response.
Call Sound effects from your code
One endpoint and one key, on the same balance as the playground. The request below is the example's own.
https:/Get an API key
Create a key in the console. It uses the same balance as the playground.
Create a keySend your first request
The same request the playground sends. Set OPENNAN_KEY to your key.
curl https://api.opennan.com/v1/audio/sound-effects \ -H "Authorization: Bearer $OPENNAN_KEY" \ -H "Content-Type: application/json" \ -d '{"text":"heavy rain on a tin roof with distant thunder","duration_seconds":5}' \ --output sound.mp3Read the result
The result comes back in the same response. The X-Usage-Cost-Usd header says what the call cost.
Errors and how to fix them
401Missing or wrong key
Send the header Authorization: Bearer with a key from the console.
402Balance too low
Add credit in Billing, then send the same call again.
400A value is not accepted
Read error.message: it names the field. Use a value from the parameter table.
429Too many requests
Wait a few seconds and try again, waiting longer after each 429.
Add Opennan to your AI app
One install gives your AI every Opennan tool: video, images, chat, voice, music, sound effects, 3D, captions and dubbing. Pick your app and follow the steps.
https:/Works in the Codex CLI, the Codex app and the Codex IDE extension: they share ~/.codex/config.toml. If the app or IDE does not see OPENNAN_KEY, use the config.toml option with your key in it. Codex asks before each tool call: approve it to go on.
Get an API key
Create a key in the console. It starts with sk- and uses the same balance as the website.
Create a keySave your key as OPENNAN_KEY
# macOS / Linux (zsh shown; bash: ~/.bashrc) echo 'export OPENNAN_KEY="sk-..."' >> ~/.zshrc source ~/.zshrc # Windows (PowerShell), then open a new terminal setx OPENNAN_KEY "sk-..."Install the Opennan plugin: the server plus a skill that teaches your AI to pick models, confirm prices and wait for results
codex plugin marketplace add Opennan/opennan-ai-plugin codex plugin add opennan@opennanOr add only the server
codex mcp add opennan --url https://api.opennan.com/v1/mcp --bearer-token-env-var OPENNAN_KEYOr add this to ~/.codex/config.toml
[mcp_servers.opennan] url = "https://api.opennan.com/v1/mcp" http_headers = { Authorization = "Bearer sk-..." }Check that opennan is listed
codex mcp listRestart Codex, then ask for anything
“Make a 5 second video of rain on a neon street, a song to go with it and a poster image.”
Replace sk-... with your own key and keep it private: anyone who has it can spend your balance. Your app can list the tools before you add a key; making anything needs one.
This tool from your AI
Once Opennan is added, your AI calls this tool with arguments like these.
- Tool
- generate_sfx
- Example arguments
{ "text": "heavy rain on a tin roof with distant thunder", "duration_seconds": 5 }
Sound effects: questions
How much does Sound effects cost?
$0.0026 per second. The Run button shows the exact price for your input before you start.
How do I call it from my code?
Send POST https://api.opennan.com/v1/audio/sound-effects with your API key. The result comes back in the same response.
Can my AI agent use it?
Yes. Add the MCP server https://api.opennan.com/v1/mcp and call the generate_sfx tool, or point your agent at https://api.opennan.com/llms.txt.
What happens if a run fails?
A failed run is not charged. You pay only for results.