Tag: x402

All the articles with the tag "x402".

• A Paywall for AI Agents, Built on a Forgotten HTTP Code

  Updated:May 30, 2026 |  at 09:37 AM

  HTTP 402 "Payment Required" was reserved in 1997 and never shipped. I used it to build a paywall that AI agents can pay through on their own, with on-chain settlement, non-extractable keys, and verification that runs on an edge function with no database. Here is how the handshake works and the decisions that made it safe.