Stax - Track every subscription your AI app runs on

Hey, I build AI products, and every one of them quietly runs on a pile of paid services OpenRouter, Exa, OpenAI, a vector DB, Slack, the list grows every week. The problem: I had no idea what any of it actually cost until the invoices hit. Usage lived in five dashboards, renewals snuck up on me, and "how much is this app costing me to run?" was a question I couldn't answer. So I built Stax. Connect once and Stax tracks every SaaS & AI subscription your app depends on plan, cost, usage and renewals — in one panel. The part I'm most proud of: a drop-in SDK that meters real API usage straight from your code (no proxy, no rerouting your traffic), so you see live spend per provider as the calls happen. It also pulls your actual invoices from Gmail and flags idle or over-budget services before they bill you. It started as a script to track my own OpenRouter spend and turned into the tool I wish I'd had from day one. Rocket Money, but for the stack your AI app runs on. Would genuinely love your feedback what's the most painful subscription to keep track of in your stack? I'm here all day answering everything 🙏