Opennan

CassetteAI Sound Effects

Live on the API
by CassetteAIMusiccassette-sfx

$0.013/track

Cheapest
Input → output
Text promptAudio
Lengths
1–30 s

CassetteAI Sound Effects

CassetteAI

Cheapest
from $0.013/track

Input

63 / 1,000
Try:

This model makes sound effects: describe the sound you want. No vocals or lyrics.

6 s
Any length from 1 to 30 seconds, one price per track.

6 s

Output

Example
Example outputMade with this prompt

thunder rumbling in the distance with steady rain on a tin roof

0:00 / 0:00

CassetteAI Sound Effects API prices

Every tier we sell, next to the model maker's official price.

All prices
CassetteAI Sound Effects prices by tier, in US dollars
TierOpennanOfficial
Per track, any length$0.013No official price

The maker doesn't sell this exact model on its own API (open weights, or retired there), so there is no official price to compare.

Call CassetteAI Sound Effects from your code

Everything for your first call is on this page: the endpoint, a key, the request and every parameter.

POSThttps://api.opennan.com/v1/music/generations

  1. Get an API key

    Create a key in the console. It uses the same balance as the playground.

    Create a key

  2. Send your first request

    The same request the playground sends. Set OPENNAN_KEY to your key.

    curl https://api.opennan.com/v1/music/generations \
  -H "Authorization: Bearer $OPENNAN_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"cassette-sfx","prompt":"Warm lo-fi hip hop, soft piano, vinyl crackle, relaxed tempo","duration":30,"instrumental":true}'

# Then poll until "status" is "succeeded" or "failed":
curl https://api.opennan.com/v1/tasks/<task id> -H "Authorization: Bearer $OPENNAN_KEY"

  3. Poll the task

    The call answers right away with a task id. Ask for the task until it finishes:

    GEThttps://api.opennan.com/v1/tasks/{id}
    queued
    Waiting for a worker
    running
    Being made
    succeeded
    Done: outputs[].url holds the files
    failed
    Failed: you are not charged

Parameters

Built from the live catalog: every value listed here is one the API accepts.

Parameters
NameTypeAllowed valuesDefaultEffect on price
modelrequiredWhich model runs the call.stringcassette-sfx——
promptrequiredStyle, mood and instruments.string———
instrumentaloptionalMusic with no vocals.boolean—true—
durationoptionalLength of the track in seconds.integer1–3030One price per track
callback_urloptionalWe send the finished task to this URL.URL———

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.

MCP serverhttps://api.opennan.com/v1/mcp

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.

  1. Get an API key

    Create a key in the console. It starts with sk- and uses the same balance as the website.

    Create a key

  2. Save 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-..."

  3. 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@opennan

  4. Or add only the server

    codex mcp add opennan --url https://api.opennan.com/v1/mcp --bearer-token-env-var OPENNAN_KEY

  5. Or add this to ~/.codex/config.toml

    [mcp_servers.opennan]
url = "https://api.opennan.com/v1/mcp"
http_headers = { Authorization = "Bearer sk-..." }

  6. Check that opennan is listed

    codex mcp list

  7. Restart 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_music
Example arguments
{
  "model": "cassette-sfx",
  "prompt": "Warm lo-fi hip hop, soft piano, vinyl crackle, relaxed tempo",
  "duration": 30
}

CassetteAI Sound Effects API questions

How much does the CassetteAI Sound Effects API cost?

CassetteAI Sound Effects API on Opennan: $0.013 per track. Prices are in US dollars per call, shown before you run, and every tier is in the price table.

What inputs does CassetteAI Sound Effects take?

Text prompt.

Which options can a call set?

Tracks from 1 to 30 seconds.

How is it billed?

One flat price per track, whatever length you pick.

What happens if a generation fails?

A failed task is refunded in full. You pay only for results.

How do I call CassetteAI Sound Effects from an AI agent?

Add the MCP server https://api.opennan.com/v1/mcp with your API key as a bearer token, then call the generate_music tool with model "cassette-sfx". Or send a POST to https://api.opennan.com/v1/music/generations.

Similar models

Music models you can call with the same key.

All models

Same task

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