Not advice, and not another explainer of how selling online works. Each of these publishes something this site’s fee database can prove and, as far as we can tell, nobody else has run.
Poshmark charges a flat $2.95 below $15 and 20% at $15 and above. Because 20% of $15 is more than $2.95, there is a narrow band where charging more leaves you with less.
Listing at $15.00 nets less than listing at $14.99, and the band does not close until $15.05.
Most marketplace percentages are billed on the order total, which includes the shipping you charged. Raising your shipping price raises your fee bill. Two platforms do not do this at all.
On an identical $10 of buyer-paid shipping, the fee it generates ranges from $1.50 on Amazon to nothing at all, depending on the platform.
Every fixed fee — a listing fee, a per-order fee, a flat processing charge — is a bigger share of a small sale. On 22 of 29 platforms the real rate on a $3 item is materially higher than on a $100 one, and on Poshmark it is 98%.
22 of 29 platforms charge a materially higher real rate on a $3 sale than on a $100 one — Grailed 8.6x its $100 rate, Poshmark 98.3% — while seven charge the same rate at every price.
The standard comparison article names a price where the cheaper platform swaps. We tested every pair on this site from $0.50 to $20,000. Seven of nine never cross.
Seven of nine platform pairs have no crossover at any price. The winner is decided by settings, not by how much you charge.
A cap or a lower top band is the reverse of a fixed fee: it makes a big sale cheaper as a share. Of 29 platforms, three have one — and on most of those it caps the marketplace fee but not the payment processing.
Three of 29 platforms take a smaller share of a $20,000 sale than of a $100 one — Discogs 4.2%, Reverb 5.7% and eBay 6.6%. On two of them only the selling fee is capped, so above $4,285 on Discogs and $15,659 on Reverb payment processing costs more than the marketplace itself.
Every figure in these pieces is computed at build time by the same engine that answers the calculators, from rates last verified 2026-10-20. None is typed by hand, so a guide cannot drift away from the tool it describes — and when a platform changes a rate, the prose changes with it.