Evidence row 2201271

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://grades-calc.x402tookit.com/final-grade-needed"
    ]
  ],
  "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": "Score needed on a final exam (or any remaining work) to reach a target class grade, from current grade and its weight.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "currentGrade": 85,
              "finalWeight": 30,
              "targetGrade": 80
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T01:53:41.493Z",
              "currentGrade": 85,
              "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.",
              "gradeIfPerfect": 89.5,
              "gradeIfZero": 59.5,
              "notChecked": [
                "your teacher's rounding (some round 89.5 up to 90)",
                "dropped lowest scores, extra credit and grade replacement policies",
                "…1 more"
              ],
              "rawComputedScore": 68.333,
              "reachable": true,
              "reasons": [
                "Needed = (target - current x (1 - weight)) / weight."
              ],
              "remainingWeightPercent": 30,
              "scoreNeededPercent": 68.333,
              "source": "computed locally (weighted average solved for the last score)",
              "summary": "You need 68.33% on the remaining 30% to finish with 80%.",
              "targetGrade": 80,
              "targetLetter": "B-",
              "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": {
                    "currentGrade": {
                      "description": "Your current class grade in percent (for example 85)",
                      "type": "number"
                    },
                    "finalWeight": {
                      "description": "Weight of the remaining work as a percent of the whole grade (for example 30)",
                      "type": "number"
                    },
                    "targetGrade": {
                      "description": "The class grade you want, in percent (for example 90)",
                      "type": "number"
                    }
                  },
                  "required": [
                    "currentGrade",
                    "finalWeight",
                    "targetGrade"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "currentGrade": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "gradeIfPerfect": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "gradeIfZero": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "rawComputedScore": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "reachable": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "remainingWeightPercent": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "scoreNeededPercent": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "targetGrade": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "targetLetter": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-02T04:06:50.704Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-02T04:06:50.492Z"
    },
    "resource": "https://grades-calc.x402tookit.com/final-grade-needed",
    "serviceName": "Grades & Study Calc",
    "tags": [
      "grades",
      "final-exam",
      "school",
      "homework"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Score needed on a final exam (or any remaining work) to reach a target class grade, from current grade and its weight."
}

What the leaf hashes

{"body":"3e45b74e766079ecd6bd9a75a6e96ce2fb7b83b83ae9e005b38cd96767f57e6a","id":2201271,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646803127536,"prev":null,"subject":"x402_bazaar:https://grades-calc.x402tookit.com/final-grade-needed","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. 0x63f121eedc26e00a2e962e39debb46dc66f9cf1a1602e57fb7dd73b60faa4def
2. 0x7271c379433fa2901279c9a06ad7e20eb6fac9b0ed888a418aceee4ca0c39098
3. 0x3d222c95bf3f10f01e81974ac363d7bed1046ec755058f3fbbe7d40aeec9946a
4. 0x478303a2936865876ac46cb99bde6dc27b12e77f74179effaa6e3d3ae0c4b796
5. 0xc777680372e3b3a34e68e7fca43bf3d82a7ea2b3ac9288796480de254c615eaa
6. 0xbd8f6498bfb8aed840f67594547d551b6512f1b790e1dd28659edcaa286f036d
7. 0x311556158f4de00e48992f6e45bf881a3e0fc6ed9f04dd450ea383550bb6ecab
8. 0xe6372cb0b86c9c44d37692e234d9d1ecd34f3e7a429fde269a8b30213a61cd4a
9. 0x64f578509decd8636b96bac085406ae43d77a01a0c99dc4d3ed1b95dcba521ef
10. 0xb94f60c3c1c6fb95901f6c84b3f4abb58d511e8a0a85f44e788b32c606bce302
11. 0xf81dc1310967bf542292c765db8667421bee570fbbd8edd052bd6c2646bdc377
12. 0xeaef14903698d949a2f8825a96ee470a4b81b85c938c299d424667f8cfdda5be
13. 0x43843187ed08d9e521651cb9dfff6531be94049b43e391bab5e05b93fc4383d3
14. 0xfb5ea8fd7d0c463ff98fdc93228854845802421c0e3865536227edf756498fcd
15. 0x23f4763e8db2efe57fbc28dfc68f2b97b65f54a03425994e68157763af649a50
16. 0x0e5696ae625571c52ddcd8dc09aa6c994b4ab38f2086df20d56f1f01c603e501
17. 0xf9973981f80219d4f00fa9186b40a8144accc0c9875572fb79eaea312a21a187
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af