Which marketplace takes the smallest cut?

On commission alone, Vinted wins (0%), then Depop in the US (3.3% plus a fixed fee), then eBay (about 13%), then Poshmark (20%). None of that tells you where to list your product.

Fixed fees change everything at the bottom of the price range

Depop's $0.45 fixed charge is 3% of a $15 sale and 0.2% of a $200 sale. Poshmark's 20% has no fixed component, so on a $14 sale it would cost $2.80, while the platform actually charges a flat $2.95 below $15. The practical effect is that cheap items behave completely differently from expensive ones.

Commission rates punish high-ticket items

20% of a $200 sale is $40. That is a month of postage for most sellers. On high-value items the percentage is the dominant cost, which is why luxury resellers gravitate to platforms with flat or near-zero commissions even when the audience is smaller.

What the buyer pays is not what you listed

Vinted's zero seller fee is funded by a buyer protection fee, so a $22 listing costs the buyer more than $22. Poshmark bundles a flat-rate shipping label that the buyer pays. Etsy's offsite ads can take another 15%. The headline number on your listing is not the number the customer sees, and conversion depends on the number they see.

The two rules that actually work

1. Compare net profit, not margin or commission. A 40% margin on a $20 item is $8. An 18% margin on a $90 item is $16.
2. Decide per product, not per shop. Low-cost, high-volume inventory belongs where fees are percentage-only. High-ticket inventory belongs where the percentage is small.

Put one product into the marketplace comparison tool and it will rank every platform by what you keep. Then take the winner and open its individual calculator to find the break-even price.