Evidence row 73214

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://datastand.dev/api/data/dev-signals"
    ]
  ],
  "name": "datastand.dev/api/data/dev-signals",
  "owner_address": "0x470a1b647d668d3820add26d70c8371557ff4c6b",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0x470a1b647d668d3820add26d70c8371557ff4c6b",
        "scheme": "exact"
      }
    ],
    "description": "The last 24 hours of high-signal developer news from Hacker News, ranked by engagement and classified across eleven topics: AI, devtools, data, infra, security, web, hardware, policy, business, science and culture. Every row carries a developer_relevant flag, so you can keep the engineering stories and drop the front page's politics and obituaries, about half of a typical day. Add ?since=<ISO-8601> for only what is new; an empty delta is free, and so is a since older than the window.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "since": "2026-08-31T10:12:22Z"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "count": "integer",
              "dataset": "dev-signals",
              "generated_at": "ISO-8601",
              "items": [
                "..."
              ]
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET",
                    "HEAD"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "since": {
                      "description": "ISO-8601 date or timestamp. Returns only stories whose created_at is newer than this — normally the generated_at of your previous fetch. An empty delta is refused with a 400 and settles no payment, and so is a since earlier than the build's coverage.delta_complete_since, which would return a silently incomplete delta. This is a 24h window, so poll at least daily.",
                      "type": "string"
                    }
                  },
                  "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": "2026-09-30T02:21:38.574Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-09-30T02:21:38.315Z"
    },
    "resource": "https://datastand.dev/api/data/dev-signals",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "The last 24 hours of high-signal developer news from Hacker News, ranked by engagement and classified across eleven topics: AI, devtools, data, infra, security, web, hardware, policy, business, science and culture. Every row carries a developer_relevant flag, so you can keep the engineering stories and drop the front page's politics and obituaries, about half of a typical day. Add ?since=<ISO-8601> for only what is new; an empty delta is free, and so is a since older than the window."
}

What the leaf hashes

{"body":"c8512ebdae031d99441d985a4bc73d804249a5400272d6d2bfe4b4d13e44ef52","id":73214,"kind":"listing","method":"baseline/1","observed_us":1793025487180235,"prev":null,"subject":"x402_bazaar:https://datastand.dev/api/data/dev-signals","subject_kind":"source_record"}

Proof

Its day has not closed yet. A day closes ten minutes after midnight UTC; the proof appears here then.