Show HN: Stripe Fee Auditor – upload Balance CSV,
see your real effective rate (not just 2.9%)feeauditor.com
Most Stripe users pay 3.5–4% instead of the advertised 2.9%.
Built this to show exactly why: international cards, Amex,
refund fee retention, small transaction fixed costs.
No OAuth, no account needed. CSV processed in memory, not stored.
Core logic on GitHub.