Roundhouse AI

know.fast

Send a link, know it: any URL — article, YouTube video, X post, podcast episode, paper, PDF, GitHub repo — becomes a durable, cited knowledge page plus a token-efficient markdown packet built for agent relay. Flat $0.01 per link. Links are unique: anything any agent has ever known answers instantly from the shared knowledge base; first-ever links are processed once, for everyone (we absorb transcription costs — a 2-hour podcast is still one cent).

SearchLiveeip155:8453Exactvia cdp
https://know.fast/v1/x402/know
KnowledgeSummarizationWeb-contentCitationsResearch
Settlements · 30d
1↓ 100%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$5.96
Verified settled volume
33 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-07-07 01:44Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x45A4A9612D4d4E78703A63dC3eF36267A6c17D96

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.

Accepts

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

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0x45A4…17D96. The signed payment is good for 5 minutes.

Paid to
0x45A4…17D96
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
10000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x45A4A9612D4d4E78703A63dC3eF36267A6c17D96",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "url": "https://paulgraham.com/greatwork.html"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "url": "https://paulgraham.com/greatwork.html",
          "kind": "article",
          "runId": "ea3edbd26c16",
          "title": "How to Do Great Work",
          "cached": true,
          "packet": "# How to Do Great Work\n\n## Summary\n…\n\n## Key claims\n- … [cited]",
          "status": "succeeded",
          "costUsd": 0.01,
          "viewerUrl": "https://know.fast/ea3edbd26c16",
          "markdownUrl": "https://know.fast/ea3edbd26c16.md",
          "knowledgeReady": true
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "url"
              ],
              "properties": {
                "url": {
                  "type": "string",
                  "maxLength": 2000,
                  "description": "The link to know — an article, YouTube video, X/Twitter post or thread, podcast episode (Spotify/Apple/Overcast), academic paper, PDF, or GitHub repo."
                },
                "lang": {
                  "type": "string",
                  "maxLength": 16,
                  "description": "Optional language hint for the knowledge packet (e.g. \"en\")."
                },
                "fresh": {
                  "type": "boolean",
                  "description": "Re-read the URL from scratch because its content changed, instead of answering from the shared knowledge base. Same flat price."
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "url": {
                  "type": "string",
                  "description": "The link that was known."
                },
                "kind": {
                  "type": "string",
                  "description": "Content type: article, video, or podcast."
                },
                "runId": {
                  "type": "string",
                  "description": "Durable id of the knowledge page."
                },
                "title": {
                  "type": "string",
                  "description": "Resolved title of the content."
                },
                "cached": {
                  "type": "boolean",
                  "description": "True when the link was already known and answered instantly."
                },
                "packet": {
                  "type": "string",
                  "description": "Token-efficient markdown knowledge packet: title, summary, key claims and facts with citations, plus pointers to full text, graded evidence, and timestamped transcript files."
                },
                "status": {
                  "type": "string",
                  "description": "succeeded for instant answers; running/queued while a first-ever link processes."
                },
                "costUsd": {
                  "type": "number",
                  "description": "What this call charged (the flat price)."
                },
                "deferred": {
                  "type": "boolean",
                  "description": "True for first-ever media links (transcription runs 2-8 minutes). Poll statusUrl until knowledgeReady, then GET markdownUrl."
                },
                "statusUrl": {
                  "type": "string",
                  "description": "Public JSON status endpoint for deferred runs — no auth needed."
                },
                "viewerUrl": {
                  "type": "string",
                  "description": "Durable, citable public knowledge page."
                },
                "markdownUrl": {
                  "type": "string",
                  "description": "The knowledge packet as raw markdown."
                },
                "knowledgeReady": {
                  "type": "boolean",
                  "description": "True when `packet` is present — answer directly from it, no second fetch."
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-07-07 01:44Z
Last indexed by Roundhouse
2026-08-04 03:20Z
Last enriched (probe, favicon, geo)
2026-09-14 00:45Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 401
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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 know.fast 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=know.fast'
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://know.fast/v1/x402/know, 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.