Seller Fees MCP
So sánh phí người bán, khoản thanh toán và giá hòa vốn trên Gumroad, Stripe, PayPal, Etsy và nhiều nền tảng khác. Chạy cục bộ bằng npx, không cần khóa API.
Tài liệu
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