Roundhouse AI

datastand.dev

A ranked, tagged digest of the last 24h of high-signal Hacker News stories, scored by engagement, with links and discussion volume. Every row is classified across eleven topics — ai, devtools, data, infra, security, web, hardware, plus policy, business, science, culture — and carries a developer_relevant flag, so you can keep the engineering stories and drop the front page's politics, science and obituaries, which are about half of a typical day. Built from public Hacker News data. Add ?since=<ISO-8601> to get only the stories that appeared since your last fetch, with the tag counts recomputed over that slice; an empty delta is not charged. Every build carries a `coverage` block stating the window it actually swept, the points threshold it was built with, and whether upstream's page came back full — and `delta_complete_since` is the point back to which a ?since= delta is complete. This is a 24h SKU, so ask for anything older and it is refused for free rather than answered short. The block also says outright what a created_at delta cannot see: the threshold is applied at fetch time, so a story that crosses it days after it was posted arrives with its original timestamp and a delta skips it. That block is on this free listing (info.output.example.coverage) at the current build's own figures, so you can check the bound against your polling interval before you pay for anything.

SearchLiveeip155:8453Exactvia wellknown:datastand.dev
https://datastand.dev/api/data/dev-signals
Calls · 30d
4↑ 16%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.
$0.91
Verified settled volume
49 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x470a1b647d668d3820add26d70c8371557ff4c6b

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x470a1b647d668d3820add26d70c8371557ff4c6b",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://datastand.dev/api/data/dev-signals",
      "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.",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 120
    }
  ],
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "since": "2026-08-31T10:12:22Z"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "count": "integer",
            "items": [
              "..."
            ],
            "dataset": "dev-signals",
            "generated_at": "ISO-8601"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "since": {
                    "type": "string",
                    "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."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 1
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.02USDC≈ $0.02 USD
on Base · exact scheme

Pay 0.02 USDC on Base to 0x470a…f4c6b. The signed payment is good for 2 minutes.

Paid to
0x470a…f4c6b
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
20000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x470a1b647d668d3820add26d70c8371557ff4c6b",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "since": "2026-08-31T10:12:22Z"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "count": 70,
          "items": [
            {
              "url": "https://openai.com/index/astra-for-law/",
              "tags": [
                "policy"
              ],
              "title": "Astra for Law",
              "points": 532,
              "signal": 1806,
              "comments": 637,
              "created_at": "2026-09-17T20:17:48Z",
              "discussion": "https://news.ycombinator.com/item?id=49745940",
              "developer_relevant": false
            }
          ],
          "dataset": "dev-signals",
          "coverage": {
            "rows": 70,
            "truncated": false,
            "window_to": "2026-09-18T14:22:07.097Z",
            "checked_at": "2026-09-18T14:22:07.097Z",
            "created_to": "2026-09-18T13:06:30.000Z",
            "window_from": "2026-09-17T14:22:07.000Z",
            "created_from": "2026-09-17T15:13:30.000Z",
            "points_above": 20,
            "window_hours": 24,
            "notes_omitted": [
              "note",
              "delta_complete_note"
            ],
            "upstream_matched": 70,
            "upstream_returned": 70,
            "upstream_page_size": 200,
            "delta_complete_known": true,
            "delta_complete_since": "2026-09-17T14:22:07.000Z",
            "notes_omitted_reason": "Prose only: sentences explaining the figures above. They are in this SKU's catalog description, and verbatim in the paid file. No fact is omitted here.",
            "upstream_matched_exact": true,
            "delta_misses_late_entrants": true
          },
          "generated_at": "2026-09-18T14:22:07.097Z"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "since": {
                  "type": "string",
                  "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."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
—
Last indexed by Roundhouse
2026-09-19 03:15Z
Last enriched (probe, favicon, geo)
2026-09-19 03:45Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service datastand.dev and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=datastand.dev'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://datastand.dev/api/data/dev-signals, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.