RFC: Transitioning from binary blocking to x402 negotiation

[arun-fairfetch]

The Problem: robots.txt is a static "keep out" sign. In an agentic web, we need a dynamic handshake.

The Proposal: Fairfetch uses the HTTP 402 code as a bridge. This discussion is for anyone who wants to debate the protocol flow. Our current implementation uses:

Content Lineage: Verified via core/signatures.py using the Ed25519 signer and SignatureBundle.

The Handshake: Enforced by payments/x402.py, which gates /content/* routes and manages the 402 "Payment Required" challenge.

Bot Steering: Handled in api/negotiation.py, which detects scrapers vs. AI agents to trigger the protocol.

Check the code: I’m looking for feedback on the middleware logic in payments/x402.py. Is the x402 flow robust enough for production agents?