Evidence row 120404

Observed 26 Oct 2026, 14:40 UTC, by baseline/1.

Kind: listing
About: source_record x402_bazaar:https://saylorinnovations.com/api/math/eval
Recorded: 26 Oct 2026, 14:40 UTC
Previous row: None: the first of its kind about this subject
Body SHA-256: d1efc2afc5878e8e20cf8768f74a369db8ad0e52408dfeec1ff11cceca7ac81e
Leaf: 0x1946299e0b8cb420b527cd2e024aeaf528a4830c3aac588b483a06c3a6c135e6

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/math/eval"
    ]
  ],
  "name": "Saylor Innovations Dev Tools",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:devkit:math-eval",
          "name": "USD Coin",
          "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
          "memo": "saylor:devkit:math-eval",
          "reference": "7BhW5bedneKn4tCAWuuKiZ4qbw2iq2D3qTivUfa2Uvxc",
          "session": "eyJhcnRpY2xlSWQiOiJkZXZraXQ6bWF0aC1ldmFsIiwicmVmZXJlbmNlIjoiN0JoVzViZWRuZUtuNHRDQVd1dUtpWjRxYncyaXEyRDNxVGl2VWZhMlV2eGMiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFUGpGV2RkNUF1ZnFTU3FlTTJxTjF4enliYXBDOEc0d0VHR2tad3lURHQxdiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MTgwODIzMDkwNX0.vTiTvr_KWnBHc6zQ9nfbR9n9YmqhfMasVJbz6DNGprw"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "Math expression evaluator - arithmetic, powers, percent, factorial and functions like sqrt, log and sin",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "expr": "(1250 * 1.0725^3 - 1250) / 12 + sqrt(144)"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "expression": "(1250 * 1.0725^3 - 1250) / 12 + sqrt(144)",
              "is_integer": false,
              "method": "recursive-descent parser, IEEE-754 double precision; functions: sqrt, cbrt, abs, ln, log10, log2, exp, sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, floor, ceil, round, trunc, sign, min, max, pow, hypot, atan2, log, factorial, gcd, deg2rad, rad2deg; constants: pi, e, tau, phi",
              "result": 36.33852376302086,
              "rounded": 36.338523763
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET",
                    "POST",
                    "PUT",
                    "PATCH",
                    "DELETE",
                    "HEAD"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "expr": {
                      "description": "Expression, e.g. (2+3)*sqrt(16)/7 or 5! + log(100) (max 500 chars)",
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "expression": {
                      "type": "string"
                    },
                    "is_integer": {
                      "type": "boolean"
                    },
                    "method": {
                      "type": "string"
                    },
                    "result": {
                      "type": "number"
                    },
                    "rounded": {
                      "type": "number"
                    }
                  },
                  "required": [
                    "expression",
                    "result"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1790235422/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-12T12:28:31.178Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-12T12:28:30.019Z"
    },
    "resource": "https://saylorinnovations.com/api/math/eval",
    "serviceName": "Saylor Innovations Dev Tools",
    "tags": [
      "math",
      "eval",
      "calculator"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Math expression evaluator - arithmetic, powers, percent, factorial and functions like sqrt, log and sin"
}

What the leaf hashes

{"body":"d1efc2afc5878e8e20cf8768f74a369db8ad0e52408dfeec1ff11cceca7ac81e","id":120404,"kind":"listing","method":"baseline/1","observed_us":1793025618010765,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/math/eval","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).
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Day root: 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained: 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published: On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON