{
  "x402Version": 2,
  "id": 37822,
  "slug": "37822",
  "resource": "https://fresh402.kirilllabs.workers.dev/v1/check",
  "description": "Cheap freshness oracle for AI agents. Register a baseline for free, then check whether scoped HTML, JSON, or text changed. Supports caller hashes, deterministic diffs, shared freshness cache, noise filtering, and HTTP revalidation.",
  "type": "http",
  "serviceName": "Fresh402 Freshness Oracle",
  "resourceType": "MCP Tool",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x58B4b483fBE31860335eCeB12CCCF4338b251085",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "5000",
      "amountUsd": 0.005,
      "maxTimeoutSeconds": 300
    }
  ],
  "outputSchema": {
    "properties": {
      "example": {
        "properties": {
          "cache_status": {
            "type": "string"
          },
          "cached": {
            "type": "boolean"
          },
          "changed": {
            "type": "boolean"
          },
          "content_kind": {
            "type": "string"
          },
          "diff": {
            "type": "object"
          },
          "hash": {
            "type": "string"
          },
          "network_fetched": {
            "type": "boolean"
          },
          "normalizer_version": {
            "type": "integer"
          },
          "snapshot_saved": {
            "type": "boolean"
          },
          "url": {
            "type": "string"
          },
          "watch_id": {
            "type": "string"
          }
        },
        "type": "object"
      },
      "type": {
        "type": "string"
      }
    },
    "required": [
      "type"
    ],
    "type": "object"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "include_diff": true,
            "max_age_seconds": 300,
            "watch_id": "w_0123456789abcdef0123456789abcdef"
          },
          "bodyType": "json",
          "method": "POST",
          "type": "http"
        },
        "output": {
          "example": {
            "cache_status": "miss",
            "cached": false,
            "changed": true,
            "comparison_source": "stored_watch",
            "content_kind": "html",
            "diff": {
              "added_excerpt": "Pro $29/month",
              "available": true,
              "change_ratio": 0.12,
              "changed": true,
              "removed_excerpt": "Pro $25/month"
            },
            "hash": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
            "network_fetched": true,
            "normalizer_version": 2,
            "snapshot_saved": true,
            "url": "https://example.com/",
            "watch_id": "w_0123456789abcdef0123456789abcdef"
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "body": {
                "additionalProperties": false,
                "oneOf": [
                  {
                    "required": [
                      "watch_id"
                    ]
                  },
                  {
                    "required": [
                      "url"
                    ]
                  }
                ],
                "properties": {
                  "ignore_json_paths": {
                    "description": "Optional JSON Pointer paths to ignore before canonical JSON fingerprinting. Wildcard * is supported.",
                    "items": {
                      "type": "string"
                    },
                    "maxItems": 20,
                    "type": "array"
                  },
                  "ignore_selectors": {
                    "description": "Optional CSS selectors removed before HTML fingerprinting.",
                    "items": {
                      "type": "string"
                    },
                    "maxItems": 20,
                    "type": "array"
                  },
                  "include_diff": {
                    "description": "Include a compact deterministic diff when comparable prior content is available.",
                    "type": "boolean"
                  },
                  "max_age_seconds": {
                    "description": "Accept a shared Fresh402 result this many seconds old instead of refetching.",
                    "maximum": 86400,
                    "minimum": 0,
                    "type": "integer"
                  },
                  "previous_hash": {
                    "description": "Optional Fresh402 SHA-256 fingerprint to compare against.",
                    "pattern": "^[a-fA-F0-9]{64}$",
                    "type": "string"
                  },
                  "selector": {
                    "description": "Optional CSS selector limiting HTML monitoring to a specific part of the page.",
                    "type": "string"
                  },
                  "url": {
                    "description": "Absolute HTTP or HTTPS URL. Use either url or watch_id.",
                    "format": "uri",
                    "type": "string"
                  },
                  "watch_id": {
                    "description": "Persistent watch ID returned by the free /v1/register endpoint or MCP fresh402_register tool.",
                    "type": "string"
                  }
                },
                "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": {
                "properties": {
                  "cache_status": {
                    "type": "string"
                  },
                  "cached": {
                    "type": "boolean"
                  },
                  "changed": {
                    "type": "boolean"
                  },
                  "content_kind": {
                    "type": "string"
                  },
                  "diff": {
                    "type": "object"
                  },
                  "hash": {
                    "type": "string"
                  },
                  "network_fetched": {
                    "type": "boolean"
                  },
                  "normalizer_version": {
                    "type": "integer"
                  },
                  "snapshot_saved": {
                    "type": "boolean"
                  },
                  "url": {
                    "type": "string"
                  },
                  "watch_id": {
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "url-freshness",
    "page-change-detection",
    "website-monitoring",
    "json-monitoring",
    "semantic-diff",
    "bazaar"
  ],
  "sourceHost": "fresh402.kirilllabs.workers.dev",
  "lastUpdated": "2026-10-08T06:08:42.204Z",
  "quality": {
    "calls30d": 4,
    "uniquePayers30d": 2,
    "lastCalledAt": "2026-10-08T06:08:41.78Z"
  },
  "metadata": {
    "serviceName": "Fresh402 Freshness Oracle",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "include_diff": true,
              "max_age_seconds": 300,
              "watch_id": "w_0123456789abcdef0123456789abcdef"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "cache_status": "miss",
              "cached": false,
              "changed": true,
              "comparison_source": "stored_watch",
              "content_kind": "html",
              "diff": {
                "added_excerpt": "Pro $29/month",
                "available": true,
                "change_ratio": 0.12,
                "changed": true,
                "removed_excerpt": "Pro $25/month"
              },
              "hash": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
              "network_fetched": true,
              "normalizer_version": 2,
              "snapshot_saved": true,
              "url": "https://example.com/",
              "watch_id": "w_0123456789abcdef0123456789abcdef"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "oneOf": [
                    {
                      "required": [
                        "watch_id"
                      ]
                    },
                    {
                      "required": [
                        "url"
                      ]
                    }
                  ],
                  "properties": {
                    "ignore_json_paths": {
                      "description": "Optional JSON Pointer paths to ignore before canonical JSON fingerprinting. Wildcard * is supported.",
                      "items": {
                        "type": "string"
                      },
                      "maxItems": 20,
                      "type": "array"
                    },
                    "ignore_selectors": {
                      "description": "Optional CSS selectors removed before HTML fingerprinting.",
                      "items": {
                        "type": "string"
                      },
                      "maxItems": 20,
                      "type": "array"
                    },
                    "include_diff": {
                      "description": "Include a compact deterministic diff when comparable prior content is available.",
                      "type": "boolean"
                    },
                    "max_age_seconds": {
                      "description": "Accept a shared Fresh402 result this many seconds old instead of refetching.",
                      "maximum": 86400,
                      "minimum": 0,
                      "type": "integer"
                    },
                    "previous_hash": {
                      "description": "Optional Fresh402 SHA-256 fingerprint to compare against.",
                      "pattern": "^[a-fA-F0-9]{64}$",
                      "type": "string"
                    },
                    "selector": {
                      "description": "Optional CSS selector limiting HTML monitoring to a specific part of the page.",
                      "type": "string"
                    },
                    "url": {
                      "description": "Absolute HTTP or HTTPS URL. Use either url or watch_id.",
                      "format": "uri",
                      "type": "string"
                    },
                    "watch_id": {
                      "description": "Persistent watch ID returned by the free /v1/register endpoint or MCP fresh402_register tool.",
                      "type": "string"
                    }
                  },
                  "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": {
                  "properties": {
                    "cache_status": {
                      "type": "string"
                    },
                    "cached": {
                      "type": "boolean"
                    },
                    "changed": {
                      "type": "boolean"
                    },
                    "content_kind": {
                      "type": "string"
                    },
                    "diff": {
                      "type": "object"
                    },
                    "hash": {
                      "type": "string"
                    },
                    "network_fetched": {
                      "type": "boolean"
                    },
                    "normalizer_version": {
                      "type": "integer"
                    },
                    "snapshot_saved": {
                      "type": "boolean"
                    },
                    "url": {
                      "type": "string"
                    },
                    "watch_id": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    }
  },
  "liveness": {
    "reliability": null
  },
  "verified": false,
  "featured": false,
  "provider": {
    "host": "fresh402.kirilllabs.workers.dev",
    "manifest_name": "fresh402.kirilllabs.workers.dev",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-10-14T01:15:01.050Z"
  },
  "exampleResponse": {
    "example": {
      "cache_status": "string",
      "cached": true,
      "changed": true,
      "content_kind": "string",
      "diff": {},
      "hash": "string",
      "network_fetched": true,
      "normalizer_version": 0,
      "snapshot_saved": true,
      "url": "string",
      "watch_id": "string"
    },
    "type": "string"
  }
}