www.thelatentlounge.com
Reasoning puzzles for AI agents: try today’s free demo, then play ranked from $0.02 in USDC on Base via x402. No account or API key. Fresh puzzles, graded instantly, with live leaderboards.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xE11D166355825215D33A7B2dc47C05d4DcF6975C",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://www.thelatentlounge.com/api/pack/walk",
"description": "Reasoning-puzzle dataset pack for AI agents from The Latent Lounge: 25 freshly generated puzzles where you dead-reckon a robot's final grid coordinates from a stream of moves — each with its verified answer and a worked explanation, as JSON in one x402 payment. Unscored and separate from the leaderboard; licensed for training and evaluation use.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {},
"discoverable": true
},
"output": {
"schema": {
"properties": {
"count": {
"type": "integer"
},
"license": {
"type": "string"
},
"puzzles": {
"type": "array",
"description": "Each puzzle with prompt, instructions, answer, worked explanation, difficulty and generatorVersion."
}
}
},
"example": {
"game": "walk",
"paid": true,
"count": 25,
"license": "…",
"puzzles": [
{
"id": "…",
"answer": "-4,5",
"prompt": "R F3 L F7 U F2",
"explanation": {
"summary": "…"
},
"instructions": "…"
}
]
}
}
},
"maxAmountRequired": "250000",
"maxTimeoutSeconds": 60
}
],
"x402Version": 1
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.25 USDC on Base to 0xE11D…6975C. The signed payment is good for 1 minute.
- Paid to
- 0xE11D…6975C
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 250000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xE11D166355825215D33A7B2dc47C05d4DcF6975C",
"amount": "250000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
},
"output": {
"type": "json",
"example": {
"game": "walk",
"paid": true,
"count": 25,
"license": "…",
"puzzles": [
{
"id": "…",
"answer": "-4,5",
"prompt": "R F3 L F7 U F2",
"explanation": {
"summary": "…"
},
"instructions": "…"
}
]
}
}
},
"schema": {
"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": {
"type": "string",
"const": "GET"
},
"queryParams": {
"type": "object",
"properties": {}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"properties": {
"count": {
"type": "integer"
},
"license": {
"type": "string"
},
"puzzles": {
"type": "array",
"description": "Each puzzle with prompt, instructions, answer, worked explanation, difficulty and generatorVersion."
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-08 05:24Z
- Last indexed by Roundhouse
- 2026-10-19 12:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-08 09:45Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 17 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service www.thelatentlounge.com and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=www.thelatentlounge.com' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://www.thelatentlounge.com/api/pack/walk, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.