MCP server
Marketplace Seller Fee Calculator
By davidemena-spec
Where to sell an item on 12 US marketplaces: eligibility, fees, profit, target price, payout timing.
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First seen 14 Nov 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| advise_marketplaces | Answer "where should I sell this?" for one item. For each US marketplace: whether it accepts the item under its published policies (prohibited and restricted items, condition rules, approval-only categories), the fees and profit at the expected price, the lowest price that meets an optional profit goal, and when the seller gets paid. Every rule cites the official page. Returns picks (highest profit, best margin, fastest payout), ranked marketplaces, ones needing approval, and excluded ones with reasons. Doesn't model demand or the price buyers will pay. | Read-only |
| calculate_fees | Calculate the seller fees, net payout, profit, margin and ROI for selling one item at a given price on one US marketplace, itemized fee by fee from the marketplace's official fee schedule. For Amazon FBA and Walmart WFS, include package dimensions to add fulfillment fees. | Read-only |
| compare_marketplaces | Rank every supported US marketplace (or a chosen subset) by the profit the seller keeps when selling one item at the same price. Returns the best marketplace, each marketplace's fees, payout and margin, and any marketplaces skipped or rejected with the reason. | Read-only |
| find_target_price | Find the lowest list price on each US marketplace that reaches a goal: a profit in USD, a profit margin percent, or an ROI percent. Results are sorted from cheapest required price; marketplaces where the goal can't be reached are listed with the reason. | Read-only |
| list_marketplaces | List the supported US marketplaces with their valid categories, options, whether package dimensions are needed, the official fee pages used as sources and the date each was verified. Call this first to find valid category and option values. | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | ListMath: Marketplace Seller Fees | - | 14 Nov 2026 |