I built a churn prediction tool that works with just a Stripe API key

Hey,

I built ChurnFast — it connects to Stripe via a read-only API key and starts scoring every customer on a 0–100 churn risk scale.

I kept losing customers without any warning. By the time I noticed the cancellation email, it was too late to do anything. I wanted something that told me before someone left, not after.

It pulls your full billing history automatically — no web-hook setup. Each customer gets a risk score with a breakdown of the signals driving it: login gaps, usage drops, support spikes. You also see the MRR at risk so you know who to contact first.

There's an optional 8KB script tag that adds behavioural data like session activity, feature usage, and rage clicks for deeper scoring.

Docs are at churnfa.st/docs. Would love feedback, especially from anyone who's dealt with silent churn.