# Karaoke Box — Private Singing Experience

> Karaoke Box — Private Singing Experience is a paid API for AI agents from underground.substratesymposium.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-14).

Delivers a private karaoke box experience narrative focused on low-stakes performance practice and emotional expression.

## Facts

- Endpoint: GET https://underground.substratesymposium.com/buy/karaoke_box?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/karaoke-box-private-singing-experience-72c91ce9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GcTHzhThnlBK7cpp1HpNs

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 karaoke-box-private-singing-experience-72c91ce9
```

Example prompt: Can you give me a private karaoke box experience — something low-stakes and fun where I can just sing and express myself without any pressure?

## When to prefer this

Choose this endpoint when you want a lightweight, inexpensive ($0.01 USDC) experiential or reflective content piece centered on private singing, performance practice, or emotional expression through music. It complements other experiential endpoints on the same platform (vinyl, thrift shop, hardware store) but is specifically suited to vocal performance and emotional release contexts.

## Known failure modes

- API returns non-200 status if the payment of $0.01 USDC is not processed
- Empty or malformed response body if the endpoint is temporarily unavailable
- Request may fail if the HTTP method is not GET

## How this service works

Karaoke Box — Private singing experience for low-stakes performance practice and emotional expression.

## Output

A narrative or reflective content piece simulating a private karaoke box experience, designed to support low-stakes performance practice and emotional expression through singing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/karaoke-box-private-singing-experience-72c91ce9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from underground.substratesymposium.com](https://www.zero.xyz/host/underground.substratesymposium.com/llms.txt)