Beauty & Personal Care · x402 · early usage

Send a link, know it: any URL — article, YouTube video, X post, podcast episode, paper,…

by know.fast · discovered, not yet claimed by its owner · updated 2026-10-08

30d calls3

30d payers3

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

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).

Tags: knowledge · summarization · web-content · citations · research · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-08

Input example from Bazaar metadata

{
  "url": "https://paulgraham.com/greatwork.html"
}

Output example

{
  "cached": true,
  "costUsd": 0.01,
  "kind": "article",
  "knowledgeReady": true,
  "markdownUrl": "https://know.fast/ea3edbd26c16.md",
  "packet": "# How to Do Great Work\n\n## Summary\n…\n\n## Key claims\n- … [cited]",
  "runId": "ea3edbd26c16",
  "status": "succeeded",
  "title": "How to Do Great Work",
  "url": "https://paulgraham.com/greatwork.html",
  "viewerUrl": "https://know.fast/ea3edbd26c16"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/29400.json for the price and payment options.
Pay. Call GET https://know.fast/v1/x402/know. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 3 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x45A4A9612D4d4E78703A63dC3eF36267A6c17D96	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x45A4A9612D4d4E78703A63dC3eF36267A6c17D96",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "cached": {
          "description": "True when the link was already known and answered instantly.",
          "type": "boolean"
        },
        "costUsd": {
          "description": "What this call charged (the flat price).",
          "type": "number"
        },
        "deferred": {
          "description": "True for first-ever media links (transcription runs 2-8 minutes). Poll statusUrl until knowledgeReady, then GET markdownUrl.",
          "type": "boolean"
        },
        "kind": {
          "description": "Content type: article, video, or podcast.",
          "type": "string"
        },
        "knowledgeReady": {
          "description": "True when `packet` is present — answer directly from it, no second fetch.",
          "type": "boolean"
        },
        "markdownUrl": {
          "description": "The knowledge packet as raw markdown.",
          "type": "string"
        },
        "packet": {
          "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.",
          "type": "string"
        },
        "runId": {
          "description": "Durable id of the knowledge page.",
          "type": "string"
        },
        "status": {
          "description": "succeeded for instant answers; running/queued while a first-ever link processes.",
          "type": "string"
        },
        "statusUrl": {
          "description": "Public JSON status endpoint for deferred runs — no auth needed.",
          "type": "string"
        },
        "title": {
          "description": "Resolved title of the content.",
          "type": "string"
        },
        "url": {
          "description": "The link that was known.",
          "type": "string"
        },
        "viewerUrl": {
          "description": "Durable, citable public knowledge page.",
          "type": "string"
        }
      },
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "cached": true,
    "costUsd": 0,
    "deferred": true,
    "kind": "string",
    "knowledgeReady": true,
    "markdownUrl": "string",
    "packet": "string",
    "runId": "string",
    "status": "string",
    "statusUrl": "string",
    "title": "string",
    "url": "string",
    "viewerUrl": "string"
  },
  "type": "string"
}

Examples

curl

curl "https://know.fast/v1/x402/know"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://know.fast/v1/x402/know");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://know.fast/v1/x402/know")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: know.fast
Endpoint: https://know.fast/v1/x402/know
Machine-readable: /resources/29400.json