ListMath: Marketplace Seller Fees

Connect Remote server

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

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

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

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

Tools 5 found in our last check

• 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.

• 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.

• 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.

• 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.

• 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…

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