Evidence row 407816

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": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-26T19:16:07.882Z"
    },
    "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":"8eb92ee9f9b9b404463c365e0f96112843bbe42346a539ca15871a62c776c3ea","id":407816,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793080252529094,"prev":283992,"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 2026-10-27 (273461 rows).

1. 0x2638611654db79f492f9e85806de5fcd3177780e62e3717756733e42af3e5176
2. 0xc60405654fb97de69350fa0a184f275aa8521296e4b5d2eb7eb682625b7c3c61
3. 0xc805fd1d25dfc139ca8bb25e51fab39c83b84d294ea0f089e872daca4e17ddfc
4. 0xc5f7660e4a0bad6af7a0d1bf0a1994b7501aeb177998f229b4f50d7c8368cf33
5. 0x16ed0aeb53d777feb1276affa3de7de2dfec64b87161fa47a87165a252238360
6. 0x73f42b8878600b76cc13afb4609a370c917d41bc2b1eeba64385f1e2c7991786
7. 0xd5a7b2941773a5af20be3c0a3540e3c4a2fdeae0a7c2b3eba5d041f3631c5ec4
8. 0x425cb54226f8a93933edd522dbdc33455de9b75ee10aab90833869946fc0bde5
9. 0xa39277d7ecd94686f289401abbda508684234f2a4bd405e26ae74a1cb3407654
10. 0xd2b46af5d576579f388a5f8e3d4ee40ea1d1a94cdd99f416479167bfe3be5f5a
11. 0xb74d1e1417c2953e5b3c2385126d77946e4effdefe4584289b6f7f7b0a99d30c
12. 0x442ef05dbe7931d22c60e72d459fdb2874e7d0eab89c16f41f0a865bf55610d6
13. 0x1a710d4f8e6092d584b581d8599ff9183c0008f9275cf0601c925b43b4e84ae6
14. 0xe8ee6f6ed50253c5ee2d1aa85a4b1a38ce94bca7f3b72fd1850f496152dbe285
15. 0xa383a1cfe9b3f6af67eb4c7642564b9424d46d7fca90e7ba175d549f8b67dd0c
16. 0x52efa60e0c3d8525486d2310eb3b6b566c9677c64fd1f819edb072cf101bcbdb
17. 0x22c1fb9487ee0b9732fa017a0cc321eb27a60c08450d112f755089796e12cb1c
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4