Keybrake

The Keybrake newsletter

A build-log on giving AI agents real power on real APIs without losing real money. One issue every three to four weeks — what we shipped, what we measured on staging, one idea you could steal.

Public archive. Every issue lives at /newsletter/issue-NN. Sign up at the bottom — same waitlist that gets the v1 beta key.

Issue #01

How long your kill switch actually takes to kill

The per-vendor revoke-propagation tail nobody warned us about — Stripe p95 3m12s, Twilio ~2m, OpenAI 1-5m, Resend near-instant. At one call per 400ms, that's about 480 Stripe charges leaked after you click Delete. Plus what shipped in the first three weeks of keybrake.com (one landing, four long-form posts, fourteen reference pages, six competitor comparisons, the agent blowout calculator), and the two questions to ask of any agent you've handed an API key.

Read issue #01 →

Get future issues

Same waitlist gets the beta key when the proxy ships. Free for six months for the first ten teams that point a real agent at it. We mean real — we'll be checking the audit log.