know.fast
POST https://know.fast/v1/x402/know
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).
How to buy
This endpoint takes pay-per-call payments over x402. Call it once without paying to see its live price; any x402 client then pays and retries automatically.
curl -i -X POST "https://know.fast/v1/x402/know"
# HTTP/1.1 402 Payment Required: price, asset and payTo are in the responseRecent checks
| Checked (UTC) | Result | Status | Time | Live price |
|---|---|---|---|---|
| 2026-10-11 08:15 | No valid 402 | 400 | 449 ms | not listed |
| 2026-10-11 03:45 | No valid 402 | 400 | 838 ms | not listed |
| 2026-10-10 23:15 | No valid 402 | 400 | 871 ms | not listed |
| 2026-10-10 17:45 | No valid 402 | 400 | 800 ms | not listed |
Receipts
No test purchases yet. Graded test purchases are next on our list; until then every number here comes from unpaid checks.
What a check proves