Evidence row 125068

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://x402-echo-service.onrender.com/chain/code"
    ]
  ],
  "name": "Contract Check",
  "owner_address": "0x9cc774a8ed49d89cba1a288f4a050b8f7fba77ee",
  "raw": {
    "accepts": [
      {
        "amount": "1000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x9Cc774A8eD49d89cBA1A288F4a050B8F7FbA77EE",
        "scheme": "exact"
      }
    ],
    "description": "Determine whether an address on Base is a contract or an externally owned account. POST {\"address\":\"0x...\"} and receive isContract, the bytecode size in bytes and its keccak-256 hash. Useful before sending funds to an unfamiliar address.",
    "extensions": {
      "bazaar": {
        "category": "Infra",
        "coverImage": "https://x402-echo-service.onrender.com/icon.png",
        "info": {
          "input": {
            "body": {
              "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "codeSize": 1234,
              "isContract": true
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "address": {
                      "type": "string"
                    }
                  },
                  "required": [
                    "address"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json"
                  ]
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http"
                }
              },
              "required": [
                "type",
                "bodyType",
                "body",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "address": {
                      "type": "string"
                    },
                    "codeSize": {
                      "type": "integer"
                    },
                    "isContract": {
                      "type": "boolean"
                    }
                  },
                  "required": [
                    "address",
                    "isContract",
                    "codeSize"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json"
                }
              },
              "required": [
                "type",
                "example"
              ],
              "type": "object"
            }
          },
          "required": [
            "input",
            "output"
          ],
          "type": "object"
        },
        "serviceName": "Contract Check",
        "summary": "Whether an address is a contract, with bytecode size.",
        "tags": [
          "contract",
          "bytecode",
          "base",
          "onchain",
          "eoa"
        ]
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1787754105/bazaar-icons/222b7a4262b684da.png",
    "lastUpdated": "2026-10-09T12:44:19.299Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-09T12:44:19.144Z"
    },
    "resource": "https://x402-echo-service.onrender.com/chain/code",
    "serviceName": "Contract Check",
    "tags": [
      "contract",
      "bytecode",
      "base",
      "onchain",
      "eoa"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Determine whether an address on Base is a contract or an externally owned account. POST {\"address\":\"0x...\"} and receive isContract, the bytecode size in bytes and its keccak-256 hash. Useful before sending funds to an unfamiliar address."
}

What the leaf hashes

{"body":"f7a6a9986839207998be5bbdec1f04746464bffe5cf61ec7678a164dc0a08c3e","id":125068,"kind":"listing","method":"baseline/1","observed_us":1793025625763762,"prev":null,"subject":"x402_bazaar:https://x402-echo-service.onrender.com/chain/code","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. 0x7df67bc1d8966514bd18df899d5278e1c9627b69e1146fc7510792ccecbca415
2. 0xa7dee29880eb4218c2b0a07073a51d894a3af805c0d888c2ba9321a278a4bf0e
3. 0xc8cae1327737976a1812ea5b605169b8e43b6ea81dd2922985443f71fd520d98
4. 0x920fb133256e052dae6240553ae219675908eed61e6b9c4446c6e39c0cfc2f0b
5. 0x3ba111d3a1e642707d577320ce2bf354d50bb59f3fa68ab3e72e5988024ea368
6. 0xc47e941b66ec27a2fe223c010f91ae358f8a706074ff92ce9be0fd216d42e51e
7. 0x38efec7b0d1daef0d6f8698e862693b5bd35785348060578a8a22259af931f6c
8. 0x5e59d5d3237733535afb494dde629d1db8849e1e5affbabf657f9de4f68d2e7c
9. 0x5dfe7ef8c83bbb998c208ea7d7d89ff8b783da931ec5ae5dae5ebce0c67f2787
10. 0x2718d6dca57166b1f1fa238e8a139e4cdbab7b7485a09970fff985d3b3878bfd
11. 0xaf10e841089e5989890dc77ffce42a46564d25ef15f30d1e35bf53a495483ad4
12. 0xab729e4203b650f2a3c15efd6fd44eb2482232373bc1de662fd9d496869eb2d3
13. 0x0bffb634300aa5609bddaa79e8d31d7cde36c0a5a4465472f809b9f5287e40d2
14. 0x7721d38652b6444b18e1193824e50490ade04851ce6221771f6e374c4527d80f
15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae