Evidence row 120189

Observed 26 Oct 2026, 14:40 UTC, by baseline/1.

Kind: listing
About: source_record x402_bazaar:https://saylorinnovations.com/api/kb/mcp-server-builder-auditor
Recorded: 26 Oct 2026, 14:40 UTC
Previous row: None: the first of its kind about this subject
Body SHA-256: 199541d2eef7bbe9c8430dd5dc1f9e45ad1a4e74187da1d374fd5480d6e3357c
Leaf: 0xcc6eea73886567fa2801c14e95200cd4bf1073842a178ca70bc4d69c552f78e5

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/kb/mcp-server-builder-auditor"
    ]
  ],
  "name": "Saylor Innovations Guide Library",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:mcp-server-builder-audito",
          "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-server-builder-audito",
          "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-server-builder-audito",
          "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-server-builder-audito",
          "reference": "9c5EgxrWLfSaaYMY4C6A7YBxsnpFvqbheok8wV65f2hC",
          "session": "eyJhcnRpY2xlSWQiOiJtY3Atc2VydmVyLWJ1aWxkZXItYXVkaXRvciIsInJlZmVyZW5jZSI6IjljNUVneHJXTGZTYWFZTVk0QzZBN1lCeHNucEZ2cWJoZW9rOHdWNjVmMmhDIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI0MTI2MjI0NjF9.vBULokaG1zeanzFo0XB1HCvbaN86XBpOD4QlEzsSQoU"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
        "extra": {
          "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
          "memo": "saylor:mcp-server-builder-audito",
          "reference": "B43pqLaBap5ZRZPpBEknGWJ5VqjLfxHcx9RssXLZp4Nf",
          "session": "eyJhcnRpY2xlSWQiOiJtY3Atc2VydmVyLWJ1aWxkZXItYXVkaXRvciIsInJlZmVyZW5jZSI6IkI0M3BxTGFCYXA1WlJaUHBCRWtuR1dKNVZxakxmeEhjeDlSc3NYTFpwNE5mIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI0MTI2MjI0NjJ9.X_cPPpmv4k_ZvM1wbUKa_jMdR6rKvrDBTIi7tsSRbpI"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "92222",
        "asset": "So11111111111111111111111111111111111111112",
        "extra": {
          "memo": "saylor:mcp-server-builder-audito",
          "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": "95075",
          "reference": "27rRQ8nVfVSuAHEMUGT8xZTaxde4aWqGdXXTDSt3Q4mN",
          "session": "eyJhcnRpY2xlSWQiOiJtY3Atc2VydmVyLWJ1aWxkZXItYXVkaXRvciIsInJlZmVyZW5jZSI6IjI3clJROG5WZlZTdUFIRU1VR1Q4eFpUYXhkZTRhV3FHZFhYVERTdDNRNG1OIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjpudWxsLCJtaW5BbW91bnQiOjkyMjIyLCJleHAiOjE3OTI0MTI2MjI0NjJ9.xHX50NemA4CQvfZjt842HRWEnnsCCWAqmgo3QwxCKdw",
          "solUsdPrice": 105.18
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "MCP server builder and auditor - tool inventory, strict schemas, server-side authorization and tests",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "body": "A structured method for building or auditing an MCP server: inventory every tool's data access, side effects, cost, and reversibility; design unique action-object names with strict JSON Schema (required fields, enums, bounds); enforce authorization server-side from authenticated identity rather than tool arguments; require confirmation and idempotency keys for consequential actions; return bounded, sanitized, provenance-carrying output; and test through a real MCP client across initialization, invalid schema, unauthorized access, duplicate, cancellation, and timeout cases. Includes a worked example of a manage_customer tool with ambiguous selection, loose schema, and a broken tenant boundary, and how each was fixed and verified.",
              "c": "AI & Agents",
              "id": "mcp-server-builder-auditor",
              "t": "MCP Server Builder and Auditor"
            },
            "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/v1790235422/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-19T12:21:42.51Z",
    "quality": {
      "l30DaysTotalCalls": 4,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-19T12:21:42.185Z"
    },
    "resource": "https://saylorinnovations.com/api/kb/mcp-server-builder-auditor",
    "serviceName": "Saylor Innovations Guide Library",
    "tags": [
      "mcp",
      "tool-schema",
      "authorization",
      "agent-security",
      "server-design"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "MCP server builder and auditor - tool inventory, strict schemas, server-side authorization and tests"
}

What the leaf hashes

{"body":"199541d2eef7bbe9c8430dd5dc1f9e45ad1a4e74187da1d374fd5480d6e3357c","id":120189,"kind":"listing","method":"baseline/1","observed_us":1793025617467176,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/kb/mcp-server-builder-auditor","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).
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Day root: 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained: 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published: On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON