How a GET probe makes working x402 endpoints look broken

A census of x402 endpoints is only as good as the request it sends. Send the wrong one and a perfectly healthy payment server reads as dead. We run a read-only census of the MCP registry every Monday, and we separate the x402 payment endpoints inside it from the rest. While building the drift check for that cohort, we hit a false negative class... Weiterlesen: How a GET probe makes working x402 endpoints look broken