Evidence row 283992

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://api.nexismvp.com/market/gas-preflight"
    ]
  ],
  "name": "Kronos Gas Preflight",
  "owner_address": "0x3b59f268ebc38c5f43b8b9be37238bf43378ad87",
  "raw": {
    "accepts": [
      {
        "amount": "1000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x3B59f268EbC38c5F43B8B9bE37238bf43378Ad87",
        "scheme": "exact"
      }
    ],
    "description": "Simulate a Base mainnet transaction before submitting it — real eth_estimateGas + eth_call against the given {to, data, value}, returns whether it would succeed, estimated gas, and estimated cost. POST body required. Experimental/informational only — not financial advice.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "chain": "base",
              "data": "0x",
              "to": "0x3B59f268EbC38c5F43B8B9bE37238bf43378Ad87",
              "value": "0x0"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "estimated_cost_eth": 1e-7,
              "estimated_gas": 21000,
              "revert_reason": null,
              "will_succeed": true
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "chain": {
                      "description": "Only 'base' supported currently",
                      "enum": [
                        "base"
                      ],
                      "type": "string"
                    },
                    "data": {
                      "description": "Call data, 0x-prefixed hex (default 0x)",
                      "type": "string"
                    },
                    "to": {
                      "description": "Target address",
                      "type": "string"
                    },
                    "value": {
                      "description": "Value in wei, 0x-prefixed hex (default 0x0)",
                      "type": "string"
                    }
                  },
                  "required": [
                    "to"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "estimated_cost_eth": {
                      "type": "number"
                    },
                    "estimated_gas": {
                      "type": "integer"
                    },
                    "revert_reason": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "will_succeed": {
                      "type": "boolean"
                    }
                  },
                  "required": [
                    "will_succeed"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-26T19:16:08.175Z",
    "quality": {
      "lastCalledAt": "2026-10-26T19:16:08.175Z"
    },
    "resource": "https://api.nexismvp.com/market/gas-preflight",
    "serviceName": "Kronos Gas Preflight",
    "tags": [
      "crypto",
      "gas",
      "simulation",
      "base"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Simulate a Base mainnet transaction before submitting it — real eth_estimateGas + eth_call against the given {to, data, value}, returns whether it would succeed, estimated gas, and estimated cost. POST body required. Experimental/informational only — not financial advice."
}

What the leaf hashes

{"body":"01c951fb979e4595dbf1e574acc2ef58950a09b570be1dacc2c15aff8be9a5ee","id":283992,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793043163607863,"prev":null,"subject":"x402_bazaar:https://api.nexismvp.com/market/gas-preflight","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).

1. 0xfa8829fef5d9c9b53e91fd3d990362ef8f95b168bc9aedc33b86f853dbaf1a71
2. 0xb1d4a39ce51804bff52eacebaa5cb479985c36cf51bc16e73b229c8bbbd1e2aa
3. 0xd17683d8838738a62c9d0dc81caf20d2302b1059227a6852de266e7bc6646eaf
4. 0x55a25a4cf90efabd74053e1c2ad29e43f9cb388ec02851ac15ea77d9ef66c93b
5. 0x82dc2de0f9c484b16aab09c998ea366fa755ad89fb09120e903dcbac273a16e2
6. 0xfff24f51c4dae916b0495fbcc773df619b22cc7e5dd5c5df2aaa6c8444387c68
7. 0xda3b641aacf51e83711a5cf194122f36825a4bb48847940c1ae27fc13f4f6a4c
8. 0x251313007860026404352ef52c835a75f48eb5f56f1e10737313e0a9f62c16ab
9. 0xa8e223de1bf6c17e20c79a0fa423cbf6ba56c81dd611a668acb2b7dd42c2dcb9
10. 0xd76f45bbfd4476d2270c8ee2682ce22ef4f12d6f8a748331c7b8b81e476c49cb
11. 0xc1f00d9dcd67fe1d14473197e5f14f3efa26c1e1569cc2a3172842f28c850633
12. 0x08d20884523152a869ac5da32efc7de7b28316f6e9c2a28242f5ea9da742852f
13. 0x694eb701ea36a0e3dcde192253ab85a618738bdc1e3a6e582e6f8bf9647f7a6a
14. 0x44945ea9ad8b24e723ad5a8fd6d014024a49531783f74ff9229c2ab6930e84c8
15. 0x68d296b1e00b4899fb83c3fba36fffaefa311eac2903067dbebfe776a12b4a9a
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae