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know.fast URL Knowledge Extraction
x402
know.fast URL Knowledge Extraction is a paid API for AI agents from know.fast, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Converts any URL (article, video, podcast, paper, PDF, GitHub repo) into a cited knowledge page and token-efficient markdown packet for agent use, at $0.01 per link.
Price / call$0.01
Success—
StatusUnknown
How this service works
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).
Output
A durable cited knowledge page and a token-efficient markdown packet containing the extracted, structured content of the submitted URL, ready for agent relay and downstream use. For previously processed URLs, results are returned instantly from a shared knowledge base without reprocessing.
Example use cases
Research paper ingestion for agent
“I need you to extract and summarize this arXiv paper into a knowledge page I can reference later — here's the link: https://arxiv.org/abs/2301.00001. Give me the key findings in markdown.”
Podcast episode to readable notes
“Can you turn this 2-hour Joe Rogan podcast episode into readable notes with cited timestamps? Here's the YouTube link: https://www.youtube.com/watch?v=abc123.”
GitHub repo context for coding agent
“I want you to process this GitHub repo and give me a structured knowledge summary of what it does, its main files, and how to use it: https://github.com/someuser/somerepo.”
Technical details
Endpoint
POSThttps://know.fast/v1/x402/knowWhen to prefer
Choose this endpoint when an agent needs to ingest and understand arbitrary URLs — articles, videos, podcasts, PDFs, or repos — as structured, cited knowledge in a single flat-rate call. Ideal when you want token-efficient markdown output ready for LLM relay, benefit from a shared global cache (previously seen links return instantly), and want transcription costs (e.g. long podcasts) absorbed by the provider rather than billed separately.
Side effects
- URL is inaccessible or returns an error (404, 403, paywall)
- URL points to unsupported content type or malformed page
- Transcription or extraction fails for certain media formats
- Payment of $0.01 USDC not completed or rejected via x402
- Rate limiting or service unavailability
Tags
x402
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