Helicopter Humans is a privacy-focused project creating tools and protocols to help give AI agents more privacy. Its free expose402 command-line tool helps users find possible x402 payment traces in supported local LangGraph SQLite history. Designed for Node.

js 24 or newer, it guides users through selecting a history file, previewing possible matches, choosing threads, and confirming cleanup. Removal affects the selected threads’ entire saved history and pending writes, while leaving other threads intact. The tool runs locally, does not upload history or use telemetry, and does not search the entire computer.

Its matches may include payment challenges or failed attempts, so they do not establish that a payment was completed. Helicopter Humans also develops z402, a payment and transport protocol intended to improve payment privacy by protecting the connection between an x402 payment and an agent. The protocol’s proof, settlement, and transport flow is in testing; the local history cleaner is available today.

The project provides documentation, source and tests, package checksums, and a public Zcash node status page