Yes, Seller Fees is free to use.

How do I install Seller Fees?

Seller Fees is a local plugin. Install it using npm package: seller-fees-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

Is Seller Fees safe to use?

Yes. Seller Fees passed MCP Marketplace's automated security scan with a score of 8.3/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with Seller Fees?

Seller Fees uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Seller Fees MCP Server

by NarwhalThePong

Developer ToolsLow Risk8.3MCP RegistryLocal

Free

Server data from the Official MCP Registry

Gumroad, Stripe, PayPal and Etsy seller fees, payouts and break-even prices. Local, no API key.

About

Gumroad, Stripe, PayPal and Etsy seller fees, payouts and break-even prices. Local, no API key.

Security Report

8.3

Low Risk8.3Low Risk

The server is a local, in-process fee calculator with no network calls, no shell execution, no file access, and no credential handling, so its behavior matches its stated purpose. The only findings are informational: a version string mismatch between server.js and package.json, unused hosted-API code bundled into the package, and promotional links to the author's own paid product in the README. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue.

7 files analyzed · 5 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-narwhalthepong-seller-fees-mcp": {
      "args": [
        "-y",
        "seller-fees-mcp"
      ],
      "command": "npx"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

seller-fees-mcp

A free Model Context Protocol (MCP) server that works out seller fees, payouts and break-even prices for Gumroad, Stripe, PayPal and Etsy (US sellers, USD). Everything runs locally: no API key, no account, no network calls.

Tools

Tool	What it does
`fee`	Fee and net for one sale. Gumroad direct includes the 2.9% + $0.30 card processing; options `discover`, `high_volume`, `processing` (`card`/`none`). PayPal `type` and `international`, Stripe `extra_pct`, Etsy `qty`, `shipping`, `sales_tax_pct`, `offsite_ads`.
`payout`	What you keep per sale and in total for `units` sales.
`price_for_target`	Lowest price that leaves at least `target` after fees.
`compare`	One price across Gumroad direct, Gumroad Discover, Stripe, PayPal (checkout, card, goods) and Etsy, best net first.
`platforms`	Default rates, options and official source pages.

Default rates are as of Oct 20, 2026. Gumroad direct: 10% + $0.50 plus card processing 2.9% + $0.30 (5% + $0.50 with high_volume); Discover: 30% all-in. Stripe: 2.9% + $0.30. PayPal Checkout: 3.49% + $0.49. Etsy: $0.20 listing, 6.5% transaction, 3% + $0.25 processing. Check each platform's pricing page before relying on a number. Planning estimates only; not tax or accounting advice.

Install

Requires Node.js 18 or newer.

npx

npx -y seller-fees-mcp

From source

git clone https://github.com/NarwhalThePong/seller-fees-mcp.git && cd seller-fees-mcp && npm install && npm test
node src/server.js

Desktop MCP clients

Add to your client's MCP config file:

{
  "mcpServers": {
    "seller-fees": { "command": "npx", "args": ["-y", "seller-fees-mcp"] }
  }
}

Cursor

Add to ~/.cursor/mcp.json (or .cursor/mcp.json in a project):

{
  "mcpServers": {
    "seller-fees": { "command": "npx", "args": ["-y", "seller-fees-mcp"] }
  }
}

For a local checkout, use "command": "node", "args": ["/path/to/seller-fees-mcp/src/server.js"].

Example

fee with { "platform": "gumroad", "amount": 19 } returns a fee of $3.25 ($2.40 Gumroad + $0.85 card processing) and a net of $15.75.

Prefer a web page?

Free Gumroad fee calculator: https://narwhalthepong.github.io/gumroad-license-check/gumroad-fee-calculator.html
Free PayPal and Stripe fee calculator: https://narwhalthepong.github.io/gumroad-license-check/paypal-stripe-fee-calculator.html
Free Etsy fee calculator: https://narwhalthepong.github.io/gumroad-license-check/etsy-fee-calculator.html
Creator Payout Calculator Pro (browser extension, paid): https://paudrudis.gumroad.com/l/ijrzbz

Disclosure: these are our own products. The calculator pages are free; Creator Payout Calculator Pro is a paid product we sell.

Prefer a spreadsheet?

Seller Fee Formulas for Google Sheets, $9: custom functions such as GUMROADFEE, STRIPEFEE, PAYPALFEE and ETSYFEE, plus price solvers for the price you need to keep a target amount, on a whole column at once. Our own paid product (the MCP server stays free).

License

MIT

Reviews

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4.8

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