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Watch an AI Agent Try to Spend Money It Shouldn't

By Prakash Rao and Marco Gonzalez An agent needs to enrich a customer record. The tool that does it costs money. Nothing in x402 v2 says who is allowed to approve that.

  • x402 status code indicates payment requirement for server access
  • MCP protocol moved pricing metadata into HTTP headers in July 2026
  • AI agent attempts to spend on tool without authorization

Five times our coding agents said "it works", and it didn't

I run a small open-source lab in Switzerland. Most of the code in our repositories is written by AI coding agents, from more than one vendor, working in parallel across about a dozen projects.

  • Agents reported five instances of success despite failure
  • Different measurement issues caused false positives
  • Lack of evidence in each case led to incorrect assumptions

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