Every marketplace publishes a percentage, and every seller compares those percentages. Taken alone that comparison is close to useless, because the fixed per-order charges sitting underneath the rate move your real cost more than the headline number does.
Headline Percentages Hide The Fixed Fees
Run a $12 sale through four platforms and the ranking is not the one the rate cards suggest.
Mercari charges 10 percent, plus 2.9 percent payment processing, plus a flat 50 cents. That comes to about 17 percent. eBay charges a 13.25 percent final value fee plus 30 cents, so about 16 percent. Poshmark charges a flat $2.95 on anything under $15, which is nearly 25 percent. Facebook Marketplace takes 5 percent on shipped orders and nothing at all on local pickup.
Poshmark carries the scariest headline at 20 percent and is the most expensive of the three here, but not because of that 20 percent. It is expensive because of a charge that is not a percentage at all.
Now run a $99 sale through the same platforms. Poshmark takes its 20 percent. Mercari lands around 13.4 percent, eBay around 13.6. The spread between cheapest and most expensive has fallen from roughly 9 points to under 7, purely because the fixed charges that dominated the small order have shrunk to rounding on the large one.
Nothing about the platforms changed. Only the order value did.
Where Each Platform Actually Wins
Fees decide margin, but they do not decide fit. Each marketplace concentrates a particular kind of buyer, and listing against that concentration matters more than shaving two points off a rate.
eBay has around 132 million active buyers and is strongest on used goods, collectibles, auto parts and refurbished electronics. Its auction format and Best Offer handle the variable pricing that unique items need, and the Authenticity Guarantee has made it the default for high value resale.
Walmart Marketplace charges referral fees of 6 to 20 percent with no monthly subscription and no listing fees, which makes it the simplest fee structure of the majors. Competition is lower than Amazon in most categories, though approval is more selective.
Poshmark works because buyers follow sellers and browse closets like a social feed, so clothing gets discovered by people who were not searching for it. Mercari has the lowest barrier to listing and a predictable flat 10 percent. Facebook Marketplace has effectively replaced Craigslist for local sales and stays free when the buyer collects in person.
Running Two Channels Without Doubling The Work
Multiplying channels multiplies exposure and it multiplies operational load at the same rate. Inventory sync, listing management, fulfillment and customer messages across three or four platforms will overwhelm a solo seller doing it by hand.
The pattern that holds up is to get one marketplace to consistent volume first, learn where its returns and disputes come from, and only then add a second. Add the multi-channel tooling when the second channel arrives, not before, because tooling bought early is a subscription paid against revenue that does not exist yet.
The full breakdown of fee structures, audience fit and multi-channel strategy across every major platform is in this guide to selling on online marketplaces.
The Takeaway
Stop comparing rate cards. Take your own typical order value, run the actual dollar cost of a sale at that number on each platform you are considering, and rank them by what you keep rather than by what they advertise. The answer changes with your price point, which is exactly why no general answer exists.
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