Marketplace seller tools
Run the decisions that happen before and after a marketplace fee check: which platform pays most, what price breaks even, how much margin is left, and whether a buy has enough upside to source again.
Pair seller tools with citable fee data
Tools solve listing-level decisions with your sale price, shipping, item cost, and sourcing assumptions. Use the Fee Index for same-input marketplace rows, Fee Changes for recent policy updates, and Seller Reports for dated summaries of fee pressure.
This keeps a workflow separate from a citation: run the tool for your own listing, then reference the baseline data asset when you need a shareable source.
Use tools with the fee calculators
The marketplace calculators answer the platform fee question. These tools answer the sourcing and pricing questions around that fee: what the listing has to sell for, how much room is left after costs, and which route deserves the first listing attempt.
Start with the best payout calculator when the same item could fit multiple marketplaces. Then move into a platform calculator once the likely winner needs category, shipping, or promotion details.