Seller Fees Calculator

io.github.NarwhalThePong由 GitHub 帳號 NarwhalThePong 發布v1.0.1更新於 Oct 29, 2026

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

發布方自己的服務：Calculator Tools MCP

已驗證STDIO僅桌面金融商業與電商

服務詳細資訊

識別碼: io.github.NarwhalThePong/seller-fees-mcp
傳輸: STDIO
執行環境: Desktop only
信任: Verified
發布於: Oct 29, 2026

安全提示

MCP 服務會接收對話中的工具呼叫請求，並可能執行外部操作。啟用前請先了解該服務能做什麼，並只授予它所需的權限。

註冊中心已驗證此條目所屬的 GitHub 帳號 NarwhalThePong。這並不表明該帳號就是產品方。

SourceWeft 的檢查只涵蓋條目是否完整、端點是否回應；不審查伺服器的程式碼，也不審查其工具的行為。

在 README 中新增徽章

向讀者展示該 MCP 服務已收錄於 SourceWeft，徽章連結到本頁。

[![Listed on SourceWeft](https://sourceweft.com/badge/mcp/io.github.NarwhalThePong%2Fseller-fees-mcp.svg)](https://sourceweft.com/mcp/io.github.NarwhalThePong%2Fseller-fees-mcp?utm_source=readme&utm_medium=badge)

概覽

AI 產生的概覽

本機 MCP 伺服器，用來計算 Gumroad、Stripe、PayPal 與 Etsy 的賣家手續費、實際入帳金額與損益兩平價格（美國賣家，美元）。

可以做什麼: 計算 Gumroad、Stripe、PayPal 或 Etsy 單筆銷售的手續費與淨收入，支援 Discover、高銷量、信用卡處理、國際交易、數量、運費、銷售稅與站外廣告等平台選項
依銷售數量計算每筆及總計的實際入帳金額
反推在扣除手續費後仍能達到目標金額的最低售價
將同一價格在 Gumroad 直連、Gumroad Discover、Stripe、PayPal 與 Etsy 之間比較，並依淨收入由高到低排序
查詢各平台的預設費率、可用選項與官方來源頁面
適用情境: 適合透過 Gumroad、Stripe、PayPal 或 Etsy 販售數位或實體商品，並希望在規劃價格時直接在助理中快速估算手續費、入帳金額或損益兩平價格的人。
執行需求: 以本機程序方式執行，可透過 npx 或原始碼啟動，需要 Node.js 18 或更新版本。不需要 API 金鑰、帳號或網路連線。

安裝前請注意

結果僅為規劃估算，不構成稅務或會計建議；預設費率有截止日期，使用前應核對各平台目前的定價頁面。README 揭露作者另販售相關付費產品（瀏覽器擴充功能與 Google 試算表外掛）並附有連結。

安裝

在 SourceWeft 中

開啟儀表板中的 Seller Fees Calculator，將其新增到工作區。
為需要使用其工具的對話啟用該服務。

Desktop only，透過 STDIO。 STDIO 服務會啟動本機處理程序，因此需要 SourceWeft 桌面主機。

其他 MCP 客戶端

參照儲存庫中的啟動說明。

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

From source

bash

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

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

Desktop MCP clients

Add to your client's MCP config file:

Cursor

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

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).