Evidence row 2201885

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://finance-calculators.x402tookit.com/rule-of-72"
    ]
  ],
  "name": "Finance Calculators",
  "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": "Years to double money at a growth rate (exact and by the rule of 72), and how long inflation takes to halve buying power.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "rate_pct": 8
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T03:59:16.045Z",
              "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.",
              "doublingYearsExact": 9.0065,
              "doublingYearsRuleOf72": 9,
              "errorOfRulePct": -0.07,
              "notChecked": [
                "taxes and fees",
                "that rates stay constant"
              ],
              "reasons": [
                "The rule of 72 is accurate within a few percent for rates between about 5 and 12 percent."
              ],
              "source": "computed locally",
              "summary": "At 8% a year money doubles in 9.01 years (rule of 72 says 9); as inflation, buying power halves in about the same time.",
              "verdict": "COMPUTED",
              "yearsTo10x": 29.919,
              "yearsToQuadruple": 18.013
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "rate_pct": {
                      "description": "Annual growth rate in percent",
                      "type": "number"
                    }
                  },
                  "required": [
                    "rate_pct"
                  ],
                  "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"
                      ]
                    },
                    "doublingYearsExact": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "doublingYearsRuleOf72": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "errorOfRulePct": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "yearsTo10x": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "yearsToQuadruple": {
                      "type": [
                        "null",
                        "number"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:54:47.37Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:54:47.207Z"
    },
    "resource": "https://finance-calculators.x402tookit.com/rule-of-72",
    "serviceName": "Finance Calculators",
    "tags": [
      "rule-of-72",
      "doubling",
      "inflation"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Years to double money at a growth rate (exact and by the rule of 72), and how long inflation takes to halve buying power."
}

What the leaf hashes

{"body":"fe7f427fe8719818085530c25164a55b561a052d732f3678d25f67d6f7b3f000","id":2201885,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646810033727,"prev":null,"subject":"x402_bazaar:https://finance-calculators.x402tookit.com/rule-of-72","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. 0x84349abec79149f3fbee40b7b83691de2d2e8ad776dfb716b030e388696eb5ac
2. 0xc4476c5caa665596aa160da796e0e86a2f7bed2d3a3c677ee9ec58d1aa0e1959
3. 0xdaacd841bdf8c303758366c65d8ac160219bdff1042cdb5170f925e1cb8ba0a5
4. 0x1f83c4fcfd139e95f2c9fbeceb4d102d962cbb8fd2c97b739bd1331706ea345e
5. 0x3a056b9011da61f1e3dbb0294f8cd56fd48c531438c621fcae3a94aaa245b392
6. 0x166fc81cba6ba4e7d242163a837a159931b90a23d19592fa44aa27b9954ec1ae
7. 0x52dad5154085f3b2441be59c348752fb2c2973456446c5e24f813125c7bf76fa
8. 0x96201ddcd1379546a0800434a260eea905bf43da6099aca1f89d707db12553b9
9. 0x0a33e5a23fb3d56398637a14d77eb7ec57568fd08f6958ff310e835ad3f054e4
10. 0xee8140a4af5fd19a317e13534bd0e922295d0f1f5cc9850e2f66ade55cd9dc15
11. 0x12ff09872c679eab51e9b79706a062ddca4539eb3c562b934a1040c62d4e3d28
12. 0x0d7ce903c884125a82bd6ab17048d38483542df814fefc95fd38be505ba8d991
13. 0x01026267e0e47b54aad32519d39da32ac6f5740a40f20ce4f9f7312a7268ad12
14. 0x45296e5ab7be6d8163e528d05039d4c685fc8962fc80b797c1d68574b10b444c
15. 0x510fa2c647d18bb802da12cf41e17d136163e6624e69ed77e15235c4284b69c7
16. 0x5e23ec5954c11a4530aab8c635a72b12bcfeb6fcb03c6cb1a990cc1743424543
17. 0x1805ef693fbdb2c23fcb61616f830408ca89bec1dc5b68ee47a770ffc0b9760a
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af