io.github.davidemena-specPublished by GitHub account davidemena-specv2026.2.1Updated Nov 14, 2026
Where to sell an item on 12 US marketplaces: eligibility, fees, profit, target price, payout timing.
The publisher's own server: Calculator Tools MCP
Calculates seller fees, net payout, profit and target prices across 12 US marketplaces and advises where to list an item.
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.github.davidemena-spec%2Fmarketplace-fees/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Add this to your client's mcpServers config.
{
"mcpServers": {
"marketplace-seller-fee-calculator": {
"type": "http",
"url": "https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp"
}
}
}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.
Takes no parameters.
Calculate fees and profit
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.
detailoptionspackagecategoryitem_costsale_pricerequiredmarketplacerequiredother_costsshipping_costfulfillment_dateshipping_chargedestimated_sales_taxCompare 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.
detailpackageitem_costoverridessale_pricerequiredother_costsmarketplacesshipping_costfulfillment_dateshipping_chargedestimated_sales_taxFind the price needed for a profit goal
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.
detailtargetrequiredpackageitem_costoverridesother_costsmarketplacesshipping_costfulfillment_dateshipping_chargedestimated_sales_taxAdvise where to list an item
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.
goaldetailpackagesort_byconditionrequireditem_costitem_typerequiredoverridesattributesother_costsmarketplacesshipping_cost+5 more83% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.
A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.
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