Evidence row 76909

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://karte.halowerk.com/v1/air-quality"
    ]
  ],
  "name": "karte.halowerk.com/v1/air-quality",
  "owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
  "raw": {
    "accepts": [
      {
        "amount": "5000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "asset": "USDC",
          "assetTransferMethod": "eip3009",
          "eip712Domain": {
            "chainId": 8453,
            "name": "USD Coin",
            "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "version": "2"
          },
          "name": "USD Coin",
          "network_name": "Base Mainnet",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
        "scheme": "exact"
      }
    ],
    "description": "Returns hourly surface concentrations from the CAMS European air-quality ensemble for a point in the cached DACH and Central Europe area. Available pollutants are CO, NO2, NO, O3, PM2.5, PM10 and SO2. Values come from the nearest 0.1 degree model cell and are labelled as a regional forecast rather than a street-level sensor reading. The local cutout is refreshed independently of paid calls, so Copernicus processing latency is not passed to the caller.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "latitude": 45,
              "longitude": 5
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "hours": {
                      "default": 24,
                      "description": "Number of hourly forecast values.",
                      "maximum": 48,
                      "minimum": 1,
                      "type": "integer"
                    },
                    "latitude": {
                      "description": "Latitude inside the cached DACH and Central Europe area.",
                      "maximum": 56,
                      "minimum": 45,
                      "type": "number"
                    },
                    "longitude": {
                      "description": "Longitude inside the cached DACH and Central Europe area.",
                      "maximum": 18,
                      "minimum": 5,
                      "type": "number"
                    },
                    "pollutants": {
                      "description": "Optional subset; default returns all seven pollutants.",
                      "items": {
                        "enum": [
                          "co",
                          "no2",
                          "no",
                          "o3",
                          "pm2_5",
                          "pm10",
                          "so2"
                        ],
                        "type": "string"
                      },
                      "maxItems": 7,
                      "minItems": 1,
                      "type": "array",
                      "uniqueItems": true
                    }
                  },
                  "required": [
                    "latitude",
                    "longitude"
                  ],
                  "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"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-08T06:15:05.882Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-08T06:15:05.464Z"
    },
    "resource": "https://karte.halowerk.com/v1/air-quality",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Returns hourly surface concentrations from the CAMS European air-quality ensemble for a point in the cached DACH and Central Europe area. Available pollutants are CO, NO2, NO, O3, PM2.5, PM10 and SO2. Values come from the nearest 0.1 degree model cell and are labelled as a regional forecast rather than a street-level sensor reading. The local cutout is refreshed independently of paid calls, so Copernicus processing latency is not passed to the caller."
}

What the leaf hashes

{"body":"7bf8bf4a96f2e2c72e4b6688b67c62499c4d340bad7694c63016cba980b5490b","id":76909,"kind":"listing","method":"baseline/1","observed_us":1793025493113410,"prev":null,"subject":"x402_bazaar:https://karte.halowerk.com/v1/air-quality","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. 0xffff4e8b74bddb49ee9f0c19b298598e65df1bce340a9886fd03583826bd1537
2. 0x9b62196afb6017e15f125110712df4d34348f49ce579b8f92cc03ea0c2f19f5e
3. 0xa4a378412b774fb6507cf941498b9ce4d5fd44f7b186eddc7bb81cce135aa6ea
4. 0xc7974d9d4bbb84071fe1027832dd23494c6508b0dc42318b0e27d3110bea85f4
5. 0x63cf881bb8944108d71a7da7575a0a3f84db9e008f018edaf2df8ebf3d381d9f
6. 0xf4fb9cd7f6cafa116444587d7e8468b150eebb874f8c7858a898c70f82c714e0
7. 0x7771cb689eda4b828dfd1a1a0dd85050c37b504175b8b829ecba1f8f6239a75b
8. 0x30d89b61ad236029e9a9118345b845d924bffcf0bf31e1b1b9eaf6c2fdc129b4
9. 0xd3a4547616d40f6cf22a3f69647bc5fe7630b638881a5ae1ce088b336fd0e181
10. 0xbd264414f726ecec85a6b231446a7d5db56b5a61f8c3f471b7913d982daa291d
11. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae