MarginGlass
Guides
Deeper explainers behind the fee math — what a platform's fee schedule actually says, why it's structured that way, and where sellers most often misread it. Every guide cites its sources and links to the calculator that runs the math for you.
Amazon's cut of an FBA sale is two genuinely different fees, not one — here's what each one covers, a worked line-item example, and where the 2026 fuel & logistics surcharge actually lands.
Read guide →Amazon vs. Etsy vs. Shopify vs. eBay: Which Platform Keeps You More Margin?One $50 sale run through all four platforms' real published fee formulas, side by side — plus why the ranking isn't the fair "cheapest platform" verdict it looks like.
Read guide →Etsy Fees Explained: Listing, Transaction & Payment ProcessingEtsy's 6.5% transaction fee is only one of three stacked fees on every sale — including a listing fee that recharges per unit sold, not once per listing. A worked example shows the real total.
Read guide →Shopify Fees by Plan: What Actually Changes Between Basic, Grow & AdvancedThe Shopify Payments rate drops as you move up plans, and the third-party transaction fee adds a second charge on top of your own gateway's fee rather than replacing it — most explainers get this backwards.
Read guide →Stripe vs. PayPal Fees: Why There's No Break-Even PointPayPal publishes two different domestic rates, and neither beats Stripe's flat 2.9% + $0.30 at any order size — the actual formulas, run side by side, instead of an assumed crossover.
Read guide →eBay's Final Value Fee: The $10 Cliff Most Explainers MisseBay's 13.6% final value fee comes with a per-order fee that jumps from $0.30 to $0.40 at a hard $10 threshold, not a smooth curve — a worked example on each side of the cliff.
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