About ProfitStamp
ProfitStamp makes Google Sheets that work out what a resale actually pays you: the marketplace fees, the label, the packaging and what the item cost, for eBay, Poshmark, Mercari, Depop and Etsy.
Who we are
ProfitStamp is made by ProfitStamp LLC, a Wyoming limited liability company. Its address is 30 N Gould St Ste N, Sheridan, WY 82801, USA.
For anything about the sheets, the fees or an order, email [email protected]. We typically reply within 2 business days.
How we check the fees
Every rate in the sheets and on this site comes from one fee register. Each row records the marketplace's official fee page, the date the rate took effect when the page gives one, and the date we last checked it. The last full check was on October 31, 2026.
We recheck the rates before each release of the sheet and when a marketplace announces a change. When a rate changes, we add a new dated row instead of editing the old one, so the sales you already recorded keep the fee they were charged.
Each release of the sheets is built from one master file, so the three editions share the same formulas. Automated checks run every fee formula against the register, and the calculator on this site is tested to the cent against the fee engine that builds the sheets, on 135 sample sales. Then each edition is opened as a fresh copy, the way a buyer gets it, and checked by hand.
The changelog lists every rate on record with its date and each fee-change notice, and the free fee calculator shows every rate with its source.
What we don't do
ProfitStamp at profitstamp.com is not connected to profitstamp.org or to any investment or trading service.
We are not affiliated with, endorsed by or sponsored by eBay, Poshmark, Mercari, Depop or Etsy. The sheets are formulas only: no scripts, macros or add-ons, and nothing connects to your marketplace accounts. We don't give tax, accounting or legal advice.