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Evidence row 120187

Observed , by baseline/1.

Kind
listing
About
source_record x402_bazaar:https://saylorinnovations.com/api/kb/mcp-connection-and-tool-call-failures
Recorded
Previous row
None: the first of its kind about this subject
Body SHA-256
493bbb6d90f7bb03e586c755a07602094c8b1df5d9b5f4caa92667fd556557df
Leaf
0x255f97f9e6f722cd1a7ca72a04b1203a2f69875950266e31f2e5a1f2e0abc750

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/kb/mcp-connection-and-tool-call-failures"
    ]
  ],
  "name": "Saylor Innovations Guide Library",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:mcp-connection-and-tool-c",
          "name": "USD Coin",
          "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:mcp-connection-and-tool-c",
          "name": "USD Coin",
          "note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:137",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:mcp-connection-and-tool-c",
          "name": "USD Coin",
          "note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:42161",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
          "memo": "saylor:mcp-connection-and-tool-c",
          "reference": "Au7dEuRJeTKHPoAiXRpksjyX6UqWEke7KEm4U9i4kwCi",
          "session": "eyJhcnRpY2xlSWQiOiJtY3AtY29ubmVjdGlvbi1hbmQtdG9vbC1jYWxsLWZhaWx1cmVzIiwicmVmZXJlbmNlIjoiQXU3ZEV1UkplVEtIUG9BaVhScGtzanlYNlVxV0VrZTdLRW00VTlpNGt3Q2kiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFUGpGV2RkNUF1ZnFTU3FlTTJxTjF4enliYXBDOEc0d0VHR2tad3lURHQxdiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5Mjg0MDE2NTU0NH0.XJdLBbU8hEKN82kQryPojYYYwgYqhI4ZPqpjXdHzs-w"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
        "extra": {
          "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
          "memo": "saylor:mcp-connection-and-tool-c",
          "reference": "DtZ1HWKaUuvcBxA2kgatGrErwLp4mKkDnGWT3N5aa9vd",
          "session": "eyJhcnRpY2xlSWQiOiJtY3AtY29ubmVjdGlvbi1hbmQtdG9vbC1jYWxsLWZhaWx1cmVzIiwicmVmZXJlbmNlIjoiRHRaMUhXS2FVdXZjQnhBMmtnYXRHckVyd0xwNG1La0RuR1dUM041YWE5dmQiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFczl2TUZyemFDRVJtSmZyRjRIMkZZRDRLQ29Oa1kxMU1jQ2U4QmVud05ZQiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5Mjg0MDE2NTU0NH0.LB-rV9jP8lrUFMqXRmtx_J3KDxibve5mJ4ynORyzUzM"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "95462",
        "asset": "So11111111111111111111111111111111111111112",
        "extra": {
          "memo": "saylor:mcp-connection-and-tool-c",
          "native": true,
          "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
          "quotedLamports": "98415",
          "reference": "EaY7dS7HBoHivMd1gtgEJ2dW8EwYEB7jWtYdefLeuW4C",
          "session": "eyJhcnRpY2xlSWQiOiJtY3AtY29ubmVjdGlvbi1hbmQtdG9vbC1jYWxsLWZhaWx1cmVzIiwicmVmZXJlbmNlIjoiRWFZN2RTN0hCb0hpdk1kMWd0Z0VKMmRXOEV3WUVCN2pXdFlkZWZMZXVXNEMiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOm51bGwsIm1pbkFtb3VudCI6OTU0NjIsImV4cCI6MTc5Mjg0MDE2NTU0NH0.1ltxMdoq1uldNZdHM7PxDoh2vB6oCOJ0SR-qgtMytL4",
          "solUsdPrice": 101.61
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "Debug MCP server connection and tool-call failures - stdio transport, initialize handshake, tool schemas, isError results, inspector",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "body": "Layer-by-layer diagnosis of Model Context Protocol failures: stdio and HTTP transport problems, stdout pollution, the initialize handshake, tools/list schema errors, tool-call error handling, timeouts and how to test a server with the MCP inspector.",
              "c": "AI & Agents",
              "id": "mcp-connection-and-tool-call-failures",
              "t": "Debug MCP Server Connection and Tool-Call Failures"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "body": {
                      "description": "Main body text",
                      "type": "string"
                    },
                    "c": {
                      "description": "Category of the guide",
                      "type": "string"
                    },
                    "id": {
                      "description": "Identifier of the record",
                      "type": "string"
                    },
                    "license": {
                      "description": "License identifier",
                      "type": "string"
                    },
                    "price": {
                      "description": "Price",
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "t": {
                      "description": "Title of the guide",
                      "type": "string"
                    }
                  },
                  "required": [
                    "id",
                    "t",
                    "c",
                    "body"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791811517/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-24T11:07:25.585Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-24T11:07:25.422Z"
    },
    "resource": "https://saylorinnovations.com/api/kb/mcp-connection-and-tool-call-failures",
    "serviceName": "Saylor Innovations Guide Library",
    "tags": [
      "mcp",
      "tools",
      "debugging",
      "json-rpc",
      "stdio"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Debug MCP server connection and tool-call failures - stdio transport, initialize handshake, tool schemas, isError results, inspector"
}

What the leaf hashes

{"body":"493bbb6d90f7bb03e586c755a07602094c8b1df5d9b5f4caa92667fd556557df","id":120187,"kind":"listing","method":"baseline/1","observed_us":1793025617465078,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/kb/mcp-connection-and-tool-call-failures","subject_kind":"source_record"}

Proof

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

  1. 0x255efb58f1b938a2e205dc823f373bb0398ad796a0d07fe53458e64b1fca6790
  2. 0x10e7eac585913443428a01fe30caa664dafacc44290001f25b1ccdf0da897a75
  3. 0xf59492015509ffd84b9be31bf60e4223274baca9c358316f2f6edece9756373c
  4. 0x491e2e8d7b5e69afdbfd6cb81fc3eca2f01127b8f8d258e34a39336d9ad9b942
  5. 0xda16a2327d377367df5b25c8f434c49cdeda1c2d63f9781fec09d1ab7f45afac
  6. 0x633e9137fdc701f83b444e68a3bf3ed731eed3c0c3d388366d53ad0248f82498
  7. 0xe77e56307bc023bf1830621477f612d326767f08dff8b64d85f735b0c05e4add
  8. 0x22ba451fed2a238e65758f42bf52add919996c08fbae8e165d3d4e761ede8fcb
  9. 0xfa5014751daf7f8365b1bda3c47df415760b3d96f8cf81af85f038c77cc989e8
  10. 0x8be58c5857bbc47fce7c17c05d9fabb43ce7fac0302eb1eceb39c699f199154d
  11. 0xd59298b1ed461f406932ca0ca85948982d67f90463e31e5b2c45ab2a35eacd3f
  12. 0x266d991b0a994042474d2789bd5d3ba2433a122ae3c1027e2ccd7c0f4cf63071
  13. 0x830b2c874449c7499489eba2baa67d49f991298225763c0161b471621038d0fb
  14. 0xd843afcced75dedd39194ff9bd12326b88099e6112686db2299392d022dc3146
  15. 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
  16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
  17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
  18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
  19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
Day root
0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained
0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published
On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON