"Self-Hosting Stripe Anomaly Detection: Building a Multi-Tenant BillingWatch with FastAPI"
python
dev.to
Why Self-Host Billing Monitoring? SaaS billing monitoring tools exist. They're fine. They also cost money, send your billing data to someone else's servers, and lock you into their alerting UX. If you're running multiple Stripe accounts — or just care about controlling sensitive financial telemetry — self-hosting is worth the hour of setup. BillingWatch is what I built to replace a paid tool: a FastAPI + SQLite stack that ingests Stripe webhooks, runs 7 real-time anomaly detectors, a