Answer four quick questions. I'll tell you exactly what to charge on every platform β and where to sell first.
Most sellers price forward β pick a number, subtract fees, and hope the profit works out. The copilot prices backward. You give it your landed product cost, the package weight, and the net margin you actually want. It then solves for the selling price on each marketplace that hits that margin after the platform's real 2026 fees, and shows the take-home profit side by side.
Because every platform charges differently, the same product rarely has the same optimal price in five places. The recommendation at the end ranks where your margin is highest and where the marketplace brings buyers β not just where the fee looks lowest.
Each marketplace takes a different mix of referral, payment, and fulfillment fees. Amazon and Walmart add a weight-based FBA/WFS fee; eBay charges a percentage final-value fee; Etsy stacks several small cuts. To keep the same net margin, your selling price has to move with those fees.
Not always. Shopify and Depop can show the lowest fee, but you must bring the audience yourself. Amazon, Etsy, and Poshmark charge more yet deliver ready buyers and search traffic. The copilot balances margin against who supplies the demand.
Instead of guessing a price and checking profit later, you set the profit you need and the tool calculates the exact price that earns it after fees. This prevents underpricing β the most common reason sellers look busy but earn almost nothing.
The models use published 2026 US rates, including FBA peak fees and Etsy's Offsite Ads tiers. Marketplaces occasionally adjust fees by category, so confirm the final figure in your own seller dashboard before listing.