Built for Sellers Who Refuse to Fly Blind on Marketplace Fees
Marketplace platforms change rate structures constantly. From multi-tiered payment processing fees and regulatory operating surcharges to offsite ad clawbacks and fulfillment placement fees, real take-home profit is nearly impossible to predict using basic back-of-the-napkin math.
100% Deterministic Math
Every fee formula is modeled strictly from current marketplace merchant documentation. No guesswork, no hidden formulas, and zero floating-point math rounding drift.
Reverse Target Pricing
Instead of guessing a selling price and hoping for a profit, our reverse solvers tell you the exact minimum dollar price required to guarantee a healthy net margin.
Privacy & Zero Bloat
We never sell your store catalog data, customer information, or sales figures. Your spreadsheet audits process entirely in your client browser for total data privacy.
Batch CSV Catalog Audits
Upload your catalog in one click. FeeSpotter scans hundreds of listings in milliseconds to flag cash-bleeding SKUs and export professional PDF audit reports.
Why FeeSpotter Was Created
In modern e-commerce, top-line revenue is vanity, and net bank deposits are sanity. Sellers regularly generate tens of thousands of dollars in gross merchandise volume (GMV) on platforms like TikTok Shop and Etsy, only to discover at tax season that their actual margins were negative.
Between Etsy's 6.5% transaction fee on shipping, TikTok's creator affiliate splits, Amazon's Inbound Placement surcharges, eBay's final value fees on sales tax, and Shopify's third-party gateway penalties, managing spreadsheets became an exhausting daily chore.
FeeSpotter replaces cumbersome spreadsheets with a unified, high-speed profit engine. Whether evaluating a single product or auditing an entire 500-SKU catalog via CSV, FeeSpotter gives you immediate financial clarity in seconds.