Evidence row 2201775

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://grades-calc.x402tookit.com/percent-to-letter"
    ]
  ],
  "name": "Grades & Study Calc",
  "owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "transactionVersions": [
            0
          ]
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:137",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:42161",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      }
    ],
    "description": "Letter grade and 4.0 GPA points for a percentage on the common US scale, with plus/minus, and points to the next grade.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "percent": 92.9
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T01:53:42.274Z",
              "degraded": false,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "gpaPoints": 3.7,
              "letter": "A-",
              "lowestPercentForThisLetter": 90,
              "nextLetterUp": "A",
              "notChecked": [
                "your school's own cut-offs (many use 93/90 or 94/90 or 92.5)",
                "teacher rounding policy",
                "…1 more"
              ],
              "passingTypical": true,
              "percentUsed": 92.9,
              "pointsToNextLetter": 0.1,
              "reasons": [
                "Plus and minus bands: 97 and up A+, 93 A, 90 A-, then the same pattern at each tens boundary."
              ],
              "source": "computed locally (common 10-point scale: 90 A, 80 B, 70 C, 60 D, with plus/minus at 3 and 7)",
              "summary": "92.9% is A- (3.7 GPA points). 0.1 more percentage point(s) reach A.",
              "verdict": "COMPUTED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "percent": {
                      "description": "Score in percent, 0 to 120",
                      "type": "number"
                    },
                    "plusMinus": {
                      "description": "false for a plain A/B/C/D/F scale (default true)",
                      "type": "string"
                    },
                    "roundHalfUp": {
                      "description": "true to round to the nearest whole percent first, the way many teachers do (default false)",
                      "type": "string"
                    }
                  },
                  "required": [
                    "percent"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "gpaPoints": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "letter": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "lowestPercentForThisLetter": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "nextLetterUp": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "passingTypical": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "percentUsed": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "pointsToNextLetter": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:26:31.698Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:26:31.409Z"
    },
    "resource": "https://grades-calc.x402tookit.com/percent-to-letter",
    "serviceName": "Grades & Study Calc",
    "tags": [
      "grades",
      "letter-grade",
      "percent",
      "school"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Letter grade and 4.0 GPA points for a percentage on the common US scale, with plus/minus, and points to the next grade."
}

What the leaf hashes

{"body":"6b62d87a2b7342659775b9f4a8db9b68f9d303ec2584c7d564c465ed673cf749","id":2201775,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646808859631,"prev":null,"subject":"x402_bazaar:https://grades-calc.x402tookit.com/percent-to-letter","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-02 (444186 rows).

1. 0xcb7400ce7b2dea94d691dc9b58dd1cfa38508bedb9e49729d8b308b64545188e
2. 0x5b2a7bb99a1f1165702526e6af0d664a457cb0e6333ec60dfed71fca1e338be7
3. 0xe9893e1ce43786535e37565ffed2c96b13c52bc3a3d598f272089182fd375aa7
4. 0x9986ebd67da3f90fe220025c0018a8607a5b4532fd6061cb9d386e6402ea4d1e
5. 0x7e3e4c7432b093a7bf8db3d6faad67dccaeb9d346310797409c0ae3014dfb2db
6. 0x96d70158732d69a8e70baf95467669203cc4c0817968296495f6980635212a91
7. 0x04f4df474dddc33181022912c5977af92a768c176d140520722b68a0d5a94486
8. 0x32d1b91aea57980d1394f23e217def8a9a99300a70e2121cb4ca40aae9261f99
9. 0xcacb85349fbbeb77b7c9327ec763ab13bafcd8a791bcf6abba62027e8e0e52bc
10. 0x8ae3523a41e14888e464b37062fe2fa44823911194e0d808ec9c1aa0b99a342d
11. 0xabd368b1af1bd1ca3ab90a16fccfbf2fe1617353b26e16f1051c9e19a1ab7ab1
12. 0x7f7e67ddaa239b7f47a381ca645be7874e814b886fdf50b97ae25602f2ebb785
13. 0x959c0d70f3f85beefd7b1347751e6e712eeaefce78a57d80eda6882038b85a52
14. 0x4f21464039902a4044b17c93873adb5a93eecc8e977b4e039acb8cd5f4210b4b
15. 0x5b456020389d8e0ef67f16a492c600b5b88189e59398bba308734db7e873e7e4
16. 0x37d31d28d0bd3743650d57e9fbf999efa4592cac831267f83aa125335b35a16b
17. 0xdb8bd933619a267f9790faac9839143d202be46af284371cc369cdf683f897ba
18. 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
19. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af