Our method and sources

Every number on ResaleMath comes from the platform's own help pages or terms, and every table shows the date we last checked it.

Platform	Last verified	Official sources
Whatnot	2026-10-02	Whatnot seller fees (Help Center, updated 21 Sep 2026) Reduced commission on high-value orders Reduced commission on electronics (ended 1 Jan 2026)
Depop	2026-10-02	Depop seller fees and charges (Help Center)
Poshmark	2026-10-02	What are the fees for selling on Poshmark? (Help Center) What are the shipping rates on Poshmark? (Help Center) Poshmark Terms of Service
Mercari	2026-10-02	Mercari selling fees (Help Center article 169)

How we calculate

Fees are applied exactly as each platform describes them, including what each fee is charged on (item price only, or item plus shipping and tax). Amounts are rounded to the cent. Results are estimates: your platform statement is the final word.

Found a change?

Platforms change fees often. If you spot a difference, tell us and we will re-check the official page within 24 hours.