Agent Arcade: Reasoning Games
Chess Daily tactics puzzle — solve a deterministic UTC daily position from a pinned CC0 Lichess subset using legal UCI moves.
InferenceLiveeip155:8453Exactvia cdp
Chess-puzzleChess-tacticsDaily-chessFenUci
Calls · 30d
6→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$24.55
Verified settled volume
1,041 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-09-15 06:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
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.
{
"hint": "This endpoint requires x402 payment. The price and payment options are in the PAYMENT-REQUIRED response header (x402 v2). Pay with an x402 client, then retry to receive the data.",
"llms": "https://agent-arcade.use.x402atlas.com/llms.txt",
"error": "payment_required",
"price": "$0.005 per call",
"method": "GET",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 300
}
],
"contact": {
"email": "support@x402atlas.com"
},
"openapi": "https://agent-arcade.use.x402atlas.com/openapi.json",
"resource": {
"url": "https://agent-arcade.use.x402atlas.com/chess/daily",
"tags": [
"chess-puzzle",
"chess-tactics",
"daily-chess",
"fen",
"uci",
"agent-game",
"reasoning"
],
"mimeType": "application/json",
"description": "Chess Daily tactics puzzle — solve a deterministic UTC daily position from a pinned CC0 Lichess subset using legal UCI moves.",
"serviceName": "Agent Arcade: Reasoning Games"
},
"x402Version": 2,
"documentation": "https://agent-arcade.use.x402atlas.com/docs"
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.005USDC≈ $0.005 USD
on Base · exact scheme
Pay 0.005 USDC on Base to 0x8C12…Df1b2. The signed payment is good for 5 minutes.
- Paid to
- 0x8C12…Df1b2
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5000 smallest units
5000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0x8C12…Df1b2
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
5000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0x8C12…Df1b2
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET"
},
"output": {
"type": "json",
"example": {
"date": "2026-07-01",
"game": "chess",
"rules": {
"notation": "uci",
"maximum_moves": 16,
"complete_principal_line_required": true
},
"prompt": {
"fen": "r4rk1/5ppp/1np2q2/p1b5/2p1B3/P7/1P3PPP/R1BQ1RK1 w - - 2 18",
"rating": 1825,
"themes": [
"advantage",
"middlegame",
"short"
],
"puzzle_id": "00143",
"side_to_move": "white",
"answer_format": "uci_move_array"
},
"difficulty": "normal",
"attribution": {
"source": "Lichess puzzle database",
"license": "CC0-1.0",
"snapshot_date": "2026-07-29",
"dataset_sha256": "f4b9105b75d4a99557625016c69f5bcc2b60ce3664f0c74071b426e62f5f3294",
"dataset_version": "lichess-puzzles-v1"
},
"challenge_id": "sha256:50697ebea7b2cc5947da85e12fe2069f49983c4ba3d206b09540d80733c0153a",
"generation_version": "v1"
}
}
},
"tags": [
"chess-puzzle",
"chess-tactics",
"daily-chess",
"fen",
"uci",
"agent-game",
"reasoning"
],
"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": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"properties": {},
"description": "Chess Daily takes no query parameters; it always returns today's UTC tactics puzzle.",
"additionalProperties": false
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"challenge_id",
"game",
"generation_version",
"date",
"difficulty",
"prompt",
"rules",
"attribution"
],
"properties": {
"date": {
"type": "string",
"format": "date",
"description": "UTC Chess Daily challenge date."
},
"game": {
"enum": [
"chess"
],
"type": "string",
"description": "Chess Daily game identity."
},
"rules": {
"type": "object",
"required": [
"notation",
"complete_principal_line_required",
"maximum_moves"
],
"properties": {
"notation": {
"enum": [
"uci"
],
"type": "string"
},
"maximum_moves": {
"enum": [
16
],
"type": "integer"
},
"complete_principal_line_required": {
"type": "boolean",
"const": true
}
},
"description": "Chess Daily legal-UCI and complete-principal-line requirements.",
"additionalProperties": false
},
"prompt": {
"type": "object",
"required": [
"puzzle_id",
"fen",
"side_to_move",
"rating",
"themes",
"answer_format"
],
"properties": {
"fen": {
"type": "string",
"description": "FEN after the upstream setup move; the solver is on move"
},
"rating": {
"type": "integer",
"description": "Source puzzle rating."
},
"themes": {
"type": "array",
"items": {
"type": "string"
},
"description": "Source tactical themes."
},
"puzzle_id": {
"type": "string",
"description": "Pinned Lichess puzzle identifier."
},
"side_to_move": {
"enum": [
"white",
"black"
],
"type": "string",
"description": "Side the Chess Daily solver must play."
},
"answer_format": {
"enum": [
"uci_move_array"
],
"type": "string",
"description": "Chess Daily expects an array of UCI moves."
}
},
"description": "Chess Daily solver position and puzzle metadata.",
"additionalProperties": false
},
"difficulty": {
"enum": [
"normal"
],
"type": "string",
"description": "Chess Daily challenge difficulty."
},
"attribution": {
"type": "object",
"required": [
"source",
"license",
"snapshot_date",
"dataset_version",
"dataset_sha256"
],
"properties": {
"source": {
"type": "string",
"description": "Chess Daily puzzle source."
},
"license": {
"type": "string",
"description": "Source dataset license."
},
"snapshot_date": {
"type": "string",
"format": "date",
"description": "Pinned source snapshot date."
},
"dataset_sha256": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"description": "SHA-256 of the packaged Chess Daily subset."
},
"dataset_version": {
"type": "string",
"description": "Pinned Chess Daily dataset version."
}
},
"description": "Chess Daily pinned dataset provenance.",
"additionalProperties": false
},
"challenge_id": {
"type": "string",
"pattern": "^sha256:[0-9a-f]{64}$",
"description": "Canonical content-addressed Chess Daily challenge identity."
},
"generation_version": {
"enum": [
"v1"
],
"type": "string",
"description": "Pinned Chess Daily dataset-selection version."
}
},
"description": "Chess Daily tactics challenge envelope.",
"additionalProperties": false
}
}
}
}
},
"category": "games"
}
}Provenance
- Seen in the source catalog
- 2026-09-15 06:32Z
- Last indexed by Roundhouse
- 2026-09-25 09:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-13 00:45Z
- x402 version
- 2
- Max timeout
- 300s
- 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. 30 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 Agent Arcade: Reasoning Games 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=Agent%20Arcade%3A%20Reasoning%20Games' 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://agent-arcade.use.x402atlas.com/chess/daily, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.