Evidence row 290504

What was observed

{
  "count": 11,
  "tools": [
    {
      "description": "Executes a documented steamwebapi GET endpoint with the caller API key from the MCP Authorization or X-Api-Key header. Refuses POST/PUT/PATCH/DELETE plus Proxy, Steam Guard and Tradeoffer endpoints.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "maxResponseBytes": {
            "default": 80000,
            "description": "Maximum response characters returned to the agent. Larger responses are truncated.",
            "maximum": 200000,
            "minimum": 1000,
            "type": "integer"
          },
          "parameters": {
            "additionalProperties": {
              "anyOf": [
                {
                  "type": [
                    "string",
                    "number",
                    "boolean"
                  ]
                },
                {
                  "items": {
                    "$ref": "#/properties/parameters/additionalProperties/anyOf/0"
                  },
                  "type": "array"
                }
              ]
            },
            "description": "Query and path parameters for the endpoint. Do not include `key`; pass your API key via the MCP Authorization or X-Api-Key header.",
            "type": "object"
          },
          "path": {
            "description": "Documented OpenAPI GET path, e.g. \"/steam/api/item\" or \"/market/{market}/prices\".",
            "minLength": 1,
            "type": "string"
          },
          "timeoutMs": {
            "default": 10000,
            "description": "HTTP timeout in milliseconds. Defaults to 10000.",
            "maximum": 20000,
            "minimum": 500,
            "type": "integer"
          }
        },
        "required": [
          "path"
        ],
        "type": "object"
      },
      "name": "call_readonly_endpoint"
    },
    {
      "description": "Returns a detailed explanation for a Steam / steamwebapi concept (identifiers, CS2 mechanics, pricing fields, inventory flags). Built from curated domain knowledge specific to this platform.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "term": {
            "description": "Concept name or alias, e.g. \"assetid\", \"doppler phase\", \"market_hash_name\", \"pricelatest\".",
            "minLength": 1,
            "type": "string"
          }
        },
        "required": [
          "term"
        ],
        "type": "object"
      },
      "name": "get_concept"
    },
    {
      "description": "Returns the full OpenAPI operation object for a given path: parameters, request body, all response schemas, examples, and tags. Use after search_endpoints to drill into a specific endpoint.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "method": {
            "description": "HTTP method. Defaults to \"get\".",
            "enum": [
              "get",
              "post",
              "put",
              "patch",
              "delete"
            ],
            "type": "string"
          },
          "path": {
            "description": "Full OpenAPI path, e.g. \"/steam/api/items\" or \"/account/me\".",
            "minLength": 1,
            "type": "string"
          }
        },
        "required": [
          "path"
        ],
        "type": "object"
      },
      "name": "get_endpoint"
    },
    {
      "description": "Read the reusable SteamWebAPI SKILL.md for integration workflows, credentials, prices, item variants and CS2 release discovery. Useful when the client does not expose MCP resources or initialization instructions.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "get_integration_skill"
    },
    {
      "description": "Returns public steamwebapi pricing plans, per-endpoint rate limits, API-key location, quota guidance and a recommended plan for the requested use case. Does not perform checkout or account actions.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "expectedRequestsPerDay": {
            "description": "Optional expected daily request count for plan recommendation.",
            "exclusiveMinimum": 0,
            "type": "integer"
          },
          "includePlanCatalog": {
            "default": true,
            "description": "Include the full public plan catalog with prices and rate limits. Defaults to true.",
            "type": "boolean"
          },
          "useCase": {
            "description": "Optional use case such as \"inventory\", \"profile\", \"float\", \"history\", \"items\", \"market prices\" or \"balanced production app\".",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "get_pricing"
    },
    {
      "description": "Lists every curated concept exposed by get_concept, optionally filtered by category. Use to discover what domain explanations are available.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "category": {
            "description": "Filter the list by concept category.",
            "enum": [
              "identifiers",
              "cs2",
              "market",
              "inventory",
              "pricing",
              "auth"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "list_concepts"
    },
    {
      "description": "Lists all steamwebapi.com endpoints (path + method + summary), optionally filtered by tag. Useful for quickly enumerating what is available.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "tag": {
            "description": "Restrict to one tag. Omit to list every endpoint grouped by tag.",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "list_endpoints"
    },
    {
      "description": "Lists every game supported by steamwebapi.com with its slug, name, Steam appId, and the value to pass as `game=` in API queries.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "list_games"
    },
    {
      "description": "Lists every third-party marketplace covered by the steamwebapi.com market price endpoints, with their domain and the games they cover.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "game": {
            "description": "Restrict to markets that cover a specific game slug, e.g. \"cs2\".",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "list_markets"
    },
    {
      "description": "Lists steamwebapi.com product packages (Price API, Inventory API, Float API, ...) with the endpoints each one bundles. Use get_pricing for paid plans, request quotas and upgrade guidance.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "list_products"
    },
    {
      "description": "Fuzzy text search across all steamwebapi.com OpenAPI endpoints and Steam domain concepts (assetid, doppler phase, market_hash_name, etc.). Returns ranked hits with path, method, tag and summary.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "kind": {
            "description": "Restrict to endpoints or concepts.",
            "enum": [
              "endpoint",
              "concept"
            ],
            "type": "string"
          },
          "limit": {
            "default": 10,
            "description": "Maximum number of hits returned.",
            "maximum": 50,
            "minimum": 1,
            "type": "integer"
          },
          "query": {
            "description": "Free-text query, e.g. \"inventory cs2\" or \"float screenshot\".",
            "minLength": 1,
            "type": "string"
          },
          "tag": {
            "description": "Restrict to one OpenAPI tag (Items, Inventory, Profile, Float, Market Prices, Market Index, Account, Info, Explore, Proxy).",
            "type": "string"
          }
        },
        "required": [
          "query"
        ],
        "type": "object"
      },
      "name": "search_endpoints"
    }
  ]
}

What the leaf hashes

{"body":"5826ec847bc380dc46ef1e0c2066321ad8e15a9149c79f553dc3ba221772c10f","id":290504,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793047315085412,"prev":null,"subject":"31d6ef80-44de-4e8f-b1b8-c0da8a7baa4b","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x7afce4891c5dd406202d3556d0a7776d6599bf8c83911e2ebdc88582e9d59c60
2. 0xe9ebbb9488b5c795cd745669355768704597af57781659fa3cf706547aa348ad
3. 0x737a2278bea8a8d24c4091edddb67d60f20904f34859f5a0be2e0ec6e5ba1447
4. 0x7fc131bf7bf50f84069bf4225793c9119f28e0f7c86d0df33ca0966ca91a2f0f
5. 0x43a5404af0ae4245234175ada24fad85afb57b782b76b3830be6621bd7a5ed64
6. 0x164d510cce3ba9af344ce1a1d36050b6c1d65382c3366c666bf28bd6a279d75c
7. 0x196562712db301f63fb87fd49121d78ad565155c0a4143a91cb6852fd27d9b49
8. 0x128fefa7179eb6b68574aebac765389ee4388b39c197ac15accaa08779300ac1
9. 0x8538b668ed58b72cabc6b99d60f85a3ea2176e1d3ec947794899400b5f19d061
10. 0x227b1846e9338d14a584d945977a59dd6a05f2e84a33212202400515ac9c0632
11. 0xe7152aaccc7d7d5da2d13bc6ee8ec470b8c1a5abe7dfed1431f0ed53ec50ebc5
12. 0xa6406b1a5540d26e0cbd03bb274a01c10968fadb17913a6043bb9427ddfb71ba
13. 0x01c95624b1f2385ef774ee258a9ae58a4df07a1bdaa829de84e1d5201f3f39c2
14. 0x7721d38652b6444b18e1193824e50490ade04851ce6221771f6e374c4527d80f
15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae