ListMath: Marketplace Seller Fees

io.github.davidemena-spec/marketplace-feesVersion 2026.2.3

Where to sell an item on major US marketplaces: eligibility, fees, profit, target price, payouts.

Status

Responds192 msNov 14, 2026, 14:49 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:49 UTC
Latency: 192 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

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Connect

Streamable HTTP

https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcpResponds192 msNov 14, 2026, 14:49 UTC

No sign-in

Claude Code

claude mcp add --transport http marketplace-fees https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: marketplace-fees
Remote MCP server URL: https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp

Cursor

{
  "mcpServers": {
    "marketplace-fees": {
      "url": "https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"marketplace-fees","type":"http","url":"https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp"}'

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Tools

5 tools

Tools of ListMath: Marketplace Seller Fees
	Description		Read-only	Idempotent	Open world
`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.	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.	No	Yes	Yes	No
`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.	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.	No	Yes	Yes	No
`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.	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.	No	Yes	Yes	No
`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.	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.	No	Yes	Yes	No
`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.	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.	No	Yes	Yes	No

Details

Registry status: Active
Published: Nov 15, 2026
Updated: Nov 15, 2026
Website: https://listmath.com/developers⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): E-commerceSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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