# know.fast

Send a link. Know it. Links are unique: anything anyone has ever known
answers instantly and free; first-ever links get known once, for everyone.

- POST https://know.fast/ {"url": "<link>"} (aliases /v1/know, /v1/analyze) —
  cache hits return {"cached": true, "costUsd": 0, "packet": "<markdown>"}:
  answer directly from packet. New articles return in seconds; video/podcast
  defer with a live viewerUrl to relay.
- GET https://know.fast/<slug>.md — the token-efficient knowledge packet
  (summary, key claims, pointers to transcript + graded evidence.json).
- Setup prompt for any agent: "Every link I share: use know.fast — fetch
  https://know.fast/agent.txt once and follow it."

Full contract: https://know.fast/agent.txt
Parent stack (deep research, topics, personas): https://researcher.now/llms.txt