Reseller True-Profit & Fee Calculator

io.github.tylerscomic-labv1.0.0Updated Oct 2, 2026

True net profit and breakeven price for eBay, Etsy, Poshmark, Mercari, Depop, Whatnot, TikTok Shop.

VerifiedStreamable HTTPWeb executableFinanceBusiness & Commerce

Overview

AI-generated overview

Calculates true net profit, platform fee breakdowns, and breakeven prices for resellers selling on seven US marketplaces.

What it does
Itemises marketplace fees for eBay, Etsy, Poshmark, Mercari, Depop, Whatnot and TikTok Shop, then subtracts shipping, item cost and supplies to give net profit, margin and ROI. Tools include calculate_net_profit, compare_platforms (same item ranked across all seven), find_breakeven_price for a target profit, and get_fee_schedule showing the schedule used with its as-of date. Custom fee percentage or flat fee can be passed to adjust for account-specific or changed fees.
When to use it
Useful when pricing or sourcing resale inventory and you want to know what a sale actually nets after platform fees, or when comparing which marketplace leaves the most profit for the same item. Also helpful for setting a minimum list price that still hits a target profit.
Requirements
A remote streamable HTTP endpoint; the README says it is hosted on MCPize with a free tier of 10 calls a day and an API key from MCPize. It can alternatively be run locally with Node.js (npm install, node server.js, listening on port 8080 with MCP at /mcp).
Before you install
The README states sales tax and income tax are not included, and that fees change often, so results carry an as-of date and should be verified against official fee pages. The hosted endpoint requires an MCPize API key; the free tier is limited to 10 calls a day.

Installation

In SourceWeft

  1. Open Reseller True-Profit & Fee Calculator in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "reseller-fees-mcp": {
      "type": "http",
      "url": "https://reseller-fees-mcp.mcpize.run/mcp"
    }
  }
}

README

Reseller True-Profit & Fee Calculator

True net profit for resellers across eBay, Etsy, Poshmark, Mercari, Depop, Whatnot and TikTok Shop. Every fee itemised from current 2026 schedules, plus platform comparison and the minimum price that hits your target profit.

What did that sale actually make you?

Sale price is not profit. Each marketplace stacks different fees, and they changed a lot in 2026. This itemises every one, then subtracts shipping, what you paid for the item and supplies.

Platforms and fees covered (US, as of 2026-10-01)

  • eBay: final value fee by category tier (standard, sports cards, handbags, watches, athletic shoes), per-order fee, Promoted Listings.
  • Etsy: listing fee, 6.5% transaction, payment processing, Offsite Ads (15% or 12%).
  • Poshmark: flat fee under $15, 20% above.
  • Mercari: 10% selling fee.
  • Depop: no US selling fee, payment processing, boosted listings.
  • Whatnot: category commission plus payment processing.
  • TikTok Shop: referral fee (8% for most categories since Aug 2026), per-order fee, affiliate commission.

Tools

  • calculate_net_profit: every fee line, net profit, margin, ROI, what you keep.
  • compare_platforms: the same item on all seven, ranked by net profit.
  • find_breakeven_price: the lowest list price that reaches your target profit.
  • get_fee_schedule: the schedule used, with the date and official page to verify.

Fees change often. Every result carries its as-of date, and you can pass custom_fee_pct or custom_flat_fee to adjust for anything that has changed or applies to your account. Sales tax and income tax are not included.

Use it

Hosted on MCPize with a free tier (10 calls a day). Remote MCP endpoint (streamable HTTP, API key from MCPize):

https://reseller-fees-mcp.mcpize.run/mcp

Or run it yourself:

bash
npm installnode server.js   # listens on :8080, MCP at /mcp

MIT licensed.

Source: README.md at commit c5d6125

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Version history

1
  1. v1.0.0LatestOct 2, 2026