78trust / 100

Know

by know.fast in News & content

x402 APIPassing, checked 2 h ago

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).

POST https://know.fast/v1/x402/know

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
522 ms typical, 566 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://know.fast/v1/x402/know" \
  -H "content-type: application/json" \
  -d '{"url":"https://paulgraham.com/greatwork.html"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fknow.fast%2Fv1%2Fx402%2Fknow
const res = await pay("https://know.fast/v1/x402/know", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"url":"https://paulgraham.com/greatwork.html"}),
});
console.log(await res.json());

Example input

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

Example output

{
  "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"
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402566 ms$0.01
6 h agoPassed402499 ms$0.01
10 h agoPassed402646 ms$0.01
13 h agoPassed402489 ms$0.01
17 h agoPassed402556 ms$0.01
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28 h agoPassed402519 ms$0.01