My AI API bill jumped, and I can't tell which feature caused it

AI-native founders see model API bills rise but cannot link spend to a feature, customer, retry, or agent run. Provider breakdowns by project, key, or model lack product labels, so unit margins and pricing stay guesswork without deliberate tagging.

This is a researched blocker from The 50x Founder. Below is the solution path — from understanding it to a paste-ready asset.

Previews, briefings, and blueprints are open to everyone and indexed. Lessons open inside the Space once you join.