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mirrored listing x402 eip155:8453eip155:137eip155:42161

Chess Daily answer check — legally validates a complete UCI principal line against the pin

Chess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.

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Claim this listing
5000 (raw units)
price
4
calls / 30d
1
unique payers
2026-09-15
updated

Provider

agent-arcade.use.x402atlas.com · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "category": "games",
    "info": {
      "input": {
        "body": {
          "answer": {
            "moves": [
              "d1h5",
              "h7h6",
              "h5c5"
            ]
          },
          "challenge_id": "sha256:50697ebea7b2cc5947da85e12fe2069f49983c4ba3d206b09540d80733c0153a",
          "date": "2026-07-01",
          "difficulty": "normal",
          "generation_version": "v1"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "challenge_id": "sha256:50697ebea7b2cc5947da85e12fe2069f49983c4ba3d206b09540d80733c0153a",
          "correct": true,
          "feedback": {
            "first_invalid_move": null,
            "message": "complete legal principal line",
            "required_moves": 3,
            "submitted_moves": 3
          },
          "game": "chess",
          "proof": {
            "normalized_line": [
              "d1h5",
              "h7h6",
              "h5c5"
            ]
          },
          "score": 100,
          "valid": true
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "description": "Chess Daily answer-check request using the identity and complete UCI line for a daily puzzle.",
              "properties": {
                "answer": {
                  "additionalProperties": false,
                  "description": "Proposed Chess Daily principal line.",
                  "properties": {
                    "moves": {
                      "description": "Complete Chess Daily principal line as legal UCI moves.",
                      "items": {
                        "pattern": "^[a-h][1-8][a-h][1-8][qrbn]?$",
                        "type": "string"
                      },
                      "maxItems": 16,
                      "type": "array"
                    }
                  },
                  "required": [
                    "moves"
                  ],
                  "type": "object"
                },
                "challenge_id": {
                  "description": "Chess Daily challenge_id copied from the daily envelope.",
                  "pattern": "^sha256:[0-9a-f]{64}$",
                  "type": "string"
                },
                "date": {
                  "description": "UTC date of the referenced Chess Daily challenge.",
                  "format": "date",
                  "type": "string"
                },
                "difficulty": {
                  "description": "Difficulty of the referenced Chess Daily challenge.",
                  "enum": [
                    "normal"
                  ],
                  "type": "string"
                },
                "generation_version": {
                  "description": "Chess Daily dataset-selection version copied from the daily envelope.",
                  "enum": [
                    "v1"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "challenge_id",
                "generation_version",
                "date",
                "difficulty",
                "answer"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "additionalProperties": false,
              "description": "Chess Daily answer-check legality and principal-line verdict.",
              "properties": {
                "challenge_id": {
                  "description": "Checked Chess Daily challenge identity.",
                  "type": "string"
                },
                "correct": {
                  "description": "Whether the complete Chess Daily principal line matches.",
                  "type": "boolean"
                },
                "feedback": {
                  "additionalProperties": false,
                  "description": "Chess Daily move legality and line-length feedback.",
                  "properties": {
                    "first_invalid_move": {
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "message": {
                      "type": "string"
                    },
                    "required_moves": {
                      "type": "integer"
                    },
                    "submitted_moves": {
                      "type": "integer"
                    }
                  },
                  "required": [
                    "message",
                    "first_invalid_move",
                    "submitted_moves",
                    "required_moves"
                  ],
                  "type": "object"
                },
                "game": {
                  "description": "Chess Daily game identity.",
                  "enum": [
                    "chess"
                  ],
                  "type": "string"
                },
                "proof": {
                  "additionalProperties": false,
                  "description": "Present only after a correct Chess Daily answer.",
                  "properties": {
                    "normalized_line": {
                      "items": {
                        "type": "string"
                      },
                      "type": "array"
                    }
                  },
                  "required": [
                    "normalized_line"
                  ],
                  "type": "object"
                },
                "score": {
                  "description": "Informational Chess Daily score: 100 when correct, otherwise 0.",
                  "type": "integer"
                },
                "valid": {
                  "description": "Whether every submitted Chess Daily move is legal.",
                  "type": "boolean"
                }
              },
              "required": [
                "challenge_id",
                "game",
                "valid",
                "correct",
                "score",
                "feedback"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    },
    "tags": [
      "chess-puzzle",
      "chess-tactics",
      "daily-chess",
      "fen",
      "uci",
      "agent-game",
      "answer-check"
    ]
  }
}

Use it

curl

curl "https://agent-arcade.use.x402atlas.com/chess/check"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://agent-arcade.use.x402atlas.com/chess/check");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://agent-arcade.use.x402atlas.com/chess/check")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/2226.json, and this resource appears in /discovery/resources and /discovery/search.