Evidence row 122007

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://stats.openverbs.com/v1/regression"
    ]
  ],
  "name": "Linear regression",
  "owner_address": "0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a",
  "raw": {
    "accepts": [
      {
        "amount": "4000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A",
        "scheme": "exact"
      }
    ],
    "description": "Ordinary-least-squares linear regression of y on x: slope, intercept, correlation r and coefficient of determination r². Pass predictAt to also evaluate the fitted line at a given x. Rejected as a clean 400 if lengths differ or x has zero variance.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "predictAt": 4,
              "x": [
                1,
                2,
                3
              ],
              "y": [
                2,
                4,
                6
              ]
            },
            "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": {
                    "predictAt": {
                      "description": "Optional x at which to evaluate the fitted line.",
                      "type": "number"
                    },
                    "x": {
                      "description": "Independent variable.",
                      "items": {
                        "type": "number"
                      },
                      "maxItems": 100000,
                      "minItems": 2,
                      "type": "array"
                    },
                    "y": {
                      "description": "Dependent variable (same length as x).",
                      "items": {
                        "type": "number"
                      },
                      "maxItems": 100000,
                      "minItems": 2,
                      "type": "array"
                    }
                  },
                  "required": [
                    "x",
                    "y"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-06T16:56:21.716Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-06T16:56:21.431Z"
    },
    "resource": "https://stats.openverbs.com/v1/regression",
    "serviceName": "Linear regression",
    "tags": [
      "linear regression",
      "ordinary least squares",
      "fit regression line",
      "predict from regression",
      "slope and intercept"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Ordinary-least-squares linear regression of y on x: slope, intercept, correlation r and coefficient of determination r². Pass predictAt to also evaluate the fitted line at a given x. Rejected as a clean 400 if lengths differ or x has zero variance."
}

What the leaf hashes

{"body":"5c0d4a232e3c4cc0d55cd5fce566ed24d5df2292ecba3c989e406b1cd24c0579","id":122007,"kind":"listing","method":"baseline/1","observed_us":1793025620795892,"prev":null,"subject":"x402_bazaar:https://stats.openverbs.com/v1/regression","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. 0x02e02e70b3bb24b1eec8b404c1fe0d300d9941f3cdae1b7ccd8e4f5e5bd027b7
2. 0xc74f1a89624fd2d294210a9f73f19b8dc3d0aefb3a2e7aa63315f2cf9bbe2949
3. 0x945d7d592e6ac78971ee3b8e81f10f43d2beccde80fe7aa2a366e5df3e9017f3
4. 0x1af6a34d6fc3f42320a4c853b59dcedc885d93c7eec0c1a296a7f59dfcee52c8
5. 0x4a1ea902782e98606f794e9010b1fd48e58d55c3d9b0eb1927fb34d35cd245d5
6. 0xcca597c99f82c7a7e5c47258a2b23a80d183992d44b08fb66a24048ccb11ebda
7. 0x87167be0c0611aac2500f87764af53a1baabd6d70517213c8da960515b5fce19
8. 0x2274a1cdb943e17e6e0a5c8c3d850be13151f4ff3f223c3c2691540c9d741b54
9. 0x6d5ca59361edb5ab7954c82b8b273e7e576daad2a5692d3b1ba97fef1f47c269
10. 0x0507461ad0f3996c7ed1e50036c084ea5d5d84cc0a082dd8688f824e00fc6a5b
11. 0x4e18f6df894eff467396bfe85f6d6b90f40522629a1dd7517152c38e1c70e111
12. 0xd75ede2689ed83bbc8980becaf4f32a77c7e05567790cd351e997bb28aa0844c
13. 0x92ff7d176556ddbe3d885e2ab73948b14a6aa3568a8fd237427d4f8415235a23
14. 0xd1d3499072edb10edc68f84bcae2365d2ab534df689250cab18c751b6f13b6ff
15. 0x7ddc2fead128357f881b63e6c7c26d7fbbb84fca6c7c8e0bbfe386de86ca8d39
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae