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Guide library

Marketplace fee guides

Seller-focused breakdowns of fee structures, shipping treatment, and the margin traps that usually show up only after the listing is already live.

2026-03-17
Ebay, Etsy, Poshmark, Mercari, Depop
Which Marketplace Has the Lowest Seller Fees in 2026?

Fee rates tell part of the story. This guide ranks all five major marketplaces by actual seller cost at four different price points, then explains why lowest is not always best.

2026-03-17
Poshmark, Mercari, Depop
Poshmark vs Mercari vs Depop: Fashion Resale Fees Compared

Poshmark, Mercari, and Depop are the top fashion resale platforms, but their fee structures are wildly different. This three-way breakdown shows where each one wins.

2026-03-17
Ebay, Etsy, Poshmark, Mercari, Depop
How to Calculate Seller Profit on Any Marketplace

Most sellers know roughly what fees cost, but still miscalculate profit because they miss a step. This guide walks through the real formula with examples on every platform.

2026-03-17
Ebay
Are eBay Fees Going Up in 2026? What Sellers Need to Know

eBay fees have trended upward over the years. Here is what the current 2026 fee structure looks like, what has changed, and how to keep your margins healthy.

2026-03-15
Ebay
eBay Fees Explained: Complete 2026 Guide

eBay fees look simple until category rates, thresholds, and shipping treatment start changing the math. This guide breaks down the parts that actually move your payout.

2026-03-15
Mercari
Mercari Fees Guide for Sellers

Mercari is simpler than eBay or Etsy, but sellers still get tripped up by how shipping changes the fee base. This guide focuses on the parts that change your payout.

2026-03-15
Poshmark
Poshmark Fees: Complete Breakdown for Sellers

Poshmark is easy to understand, but that does not make it cheap. The flat-under-$15 rule and 20% commission change pricing decisions much more than most sellers expect.

From guide to calculator

Each guide explains how fee rules work in practice. Once you have the context, test your exact listing in the calculator to see whether the payout still works.

What these guides focus on

The guides are written for sellers who need practical fee clarity, not generic ecommerce theory. They focus on the parts of each marketplace that actually change payout: shipping treatment, category rules, flat-fee thresholds, and the mistakes sellers make when they price from memory.

Read a guide when you need context around a fee structure, then use the calculator page to test the exact numbers on your listing.

How to read the guides efficiently

Start with the guide that matches the platform where you list most often. If you are cross-listing, use the related comparison pages from the article to test whether a lower fee or stronger audience actually changes the result.

The article gives you the context. The calculator gives you the decision.

Over time, the guide library should make the workflow faster, not heavier. You should be able to learn the rule you are likely to forget, test the actual listing, and decide whether the item still belongs on that marketplace without bouncing between vague reference articles and separate tools.

That also means the library should expand in clusters, not randomly. When a new guide goes live, it should connect to the calculator page, the comparison pages that matter most, and the next obvious article a seller would need if the margin is still unclear.

A strong guide index should feel like a working library for sellers, not a blog roll. The page should make it obvious which guide helps with platform math today, which one helps with cross-listing decisions, and which one is meant to catch the fee rule that trips people up most often.

Who writes and reviews the guides

Founder, editor, and calculator maintainer

Maciej Dudziak

Maciej Dudziak builds and maintains FlipCalc through Maciej Dudziak IT Services in Poland for marketplace sellers who want clear fee math, current fee notes, and practical pricing guidance before they list an item.

Every guide and calculator page is written to help sellers price items before they list, compare platforms using the same assumptions, and avoid margin surprises after a sale closes.

Business details

Maciej Dudziak IT Services

Poland

NIP: 8943034011

REGON: 021741556

53-447, Wrocław, ul. Jemiołowa 15/16

maciejdzk@gmail.com

Reviewed and updated on 2026-03-15.

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