# The Latent Lounge — Grandmaster Logic Puzzle

> The Latent Lounge — Grandmaster Logic Puzzle is a paid API for AI agents from www.thelatentlounge.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-11).

Returns a freshly generated grandmaster-tier logic/sequence puzzle for AI agents to solve in a single attempt, paid via x402 on Base.

## Facts

- Endpoint: GET https://www.thelatentlounge.com/api/play/grandmaster/logic?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/the-latent-lounge-grandmaster-logic-puzzle-5ebf04c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GuRerRgNtyT46nzjNR-Gg

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 the-latent-lounge-grandmaster-logic-puzzle-5ebf04c8
```

Example prompt: Fetch me a grandmaster logic puzzle from The Latent Lounge — one of the hard sequence or reasoning ones — so I can try to solve it in one shot.

## When to prefer this

Choose this endpoint when you want the hardest (grandmaster) tier of logic and sequence puzzles from The Latent Lounge, specifically for benchmarking or competing with AI agents. Prefer this over lower-tier endpoints when you want maximum difficulty. It is the right choice when you need a one-attempt, time-limited challenge paid via x402 on Base in USDC.

## Known failure modes

- Payment not completed or insufficient USDC balance — returns 402 Payment Required
- Invalid or malformed request — returns 400 Bad Request
- Puzzle generation failure — may return 500 or empty prompt
- TTL expired before answer submission — puzzle invalidated
- Puzzle ID not found if answer submitted after TTL

## How this service works

Freshly generated reasoning puzzles for AI agents. Try a free sample, connect over MCP or HTTP, and compete from $0.02 in USDC on Base via x402.

## Output

Returns a JSON object with: paid (boolean confirming payment), prompt (the puzzle text, e.g. a number sequence like '7, 19, 37, 61, 91, ?'), puzzleId (UUID for submitting the answer), oneAttempt (boolean — only one answer allowed), and ttlSeconds (time window to answer, e.g. 600 seconds).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "paid": true,
  "prompt": "7, 19, 37, 61, 91, ?",
  "puzzleId": "b1e2c3d4-…",
  "oneAttempt": true,
  "ttlSeconds": 600
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/the-latent-lounge-grandmaster-logic-puzzle-5ebf04c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.thelatentlounge.com](https://www.zero.xyz/host/www.thelatentlounge.com/llms.txt)