Evidence row 64712

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://api.agentstools.dev/scholar/oa"
    ]
  ],
  "name": "scholar-oa",
  "owner_address": "0xf22e558a00d91ee12a1f50c52186fecb8ddff493",
  "raw": {
    "accepts": [
      {
        "amount": "8000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493",
        "scheme": "exact"
      }
    ],
    "description": "Locate a free open-access PDF for a DOI. Returns whether an open-access copy exists and the best PDF link with its license, version and host type, from Unpaywall and OpenAlex. A cheap, focused open-access locator.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "doi": "10.1038/nature14539"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "attribution": [
                "Data from Unpaywall (unpaywall.org)"
              ],
              "best_oa": {
                "host_type": "repository",
                "is_oa": true,
                "landing_page": "https://example.org/paper",
                "license": "cc-by",
                "pdf_url": "https://example.org/paper.pdf",
                "source": "unpaywall",
                "version": "publishedVersion"
              },
              "found": true,
              "is_oa": true,
              "query": {
                "doi": "10.1038/nature14539"
              },
              "sources": {
                "partial": false,
                "used": [
                  "unpaywall",
                  "openalex"
                ]
              },
              "title": "Deep learning"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "doi": {
                      "description": "DOI, with or without a doi.org prefix",
                      "type": "string"
                    },
                    "id": {
                      "description": "A DOI (alias for doi)",
                      "type": "string"
                    }
                  },
                  "required": [],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-08T06:08:13.985Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-08T06:08:13.756Z"
    },
    "resource": "https://api.agentstools.dev/scholar/oa",
    "serviceName": "scholar-oa",
    "tags": [
      "scholar",
      "research",
      "open-access",
      "oa",
      "pdf"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Locate a free open-access PDF for a DOI. Returns whether an open-access copy exists and the best PDF link with its license, version and host type, from Unpaywall and OpenAlex. A cheap, focused open-access locator."
}

What the leaf hashes

{"body":"6101892e871c6b736f9c38c86365e525554ee95620e054cdb2a5467d1f0e30c6","id":64712,"kind":"listing","method":"baseline/1","observed_us":1793025457200823,"prev":null,"subject":"x402_bazaar:https://api.agentstools.dev/scholar/oa","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. 0x06865a28d73b84f6b8247128efc647bd53be43878055e189081a092f146c301d
2. 0x05497ae70d17257cac9b215d12d1490aad9ea100ae8b26b08a23e795557271bf
3. 0xf5ced59da2c683276615e4da4f281aedf1727dc750ae18e1d3eb715fdea01630
4. 0xf84bfc729883f91c70518ee45c220aa3b94ab6bf317e7042ebb3ab13d3601fae
5. 0x21673c6e67e65f8bc0ae73cd6fce40d38d5744841426b508a480217be3dff914
6. 0xe8d5249299e7793bb358b357d5190203d8dd82a3b9e2b5ff87fe3e79f62e9570
7. 0xd0d27b4fe2e9078afbfea2a79657606dd702ce926d73cff88a7fe17866236b44
8. 0xeb5116fcdfc617f37b007756ab07da0d1e503fa047bf54688aa81a7c0d02947d
9. 0x6e538db4f1455c6d04905f64f86fb450c3bbff3587230abde981dd4508ce1db1
10. 0x9abec6ee1635bb27b43d1d28ce76f43acecbee7bd987ce66e0f56f906bd1efb6
11. 0xdd6d5f87470c9b64b375ecc2fb3ff4a65fedf3d6a0bd40f365da40a6a41b103d
12. 0x7910a200eb458bec3c3badb3b2ead3e75cec5f3ba263800cea6b9f32efb53f25
13. 0x610fdf3e989af0a6b4a400a3a8aab9156d757f8c96efe4e9d0594dfd04de1cc0
14. 0xd1d3499072edb10edc68f84bcae2365d2ab534df689250cab18c751b6f13b6ff
15. 0x7ddc2fead128357f881b63e6c7c26d7fbbb84fca6c7c8e0bbfe386de86ca8d39
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae