CS2 Profit Checker
Automated CS2 Trading Profit & Tax Manager

Supported marketplaces: CSFloat, Buff163, Youpin, DMarket, CSMoney, BuffMarket, Skinport, Skins, SkinSwap, SkinPlace

🔍 Features & What It Does

This extension operates entirely locally on your PC. It doesn't collect any data to 3rd party servers.

• 🔄 Cross-Marketplace Matching: Checks your login status with 1 click and fetches your full transaction history across all enabled marketplaces. Automatically matches purchases and sales between them.
• 💰 Balance & Fee Calculations: Automatically accounts for the specific selling fees of each marketplace to calculate your true net profit. It also calculates your total wallet balance across all connected marketplaces, including usable, pending, and frozen funds (e.g., in active bargains).
• 📈 Profit Reports: Generates a clean, formatted .xlsx file detailing your trades. Includes "Profit" and "Profit %" columns, and features auto-filters for easy sorting by Profit, Date, or Price. The Dashboard table serves as a convenient preview of this file.
• 🏛️ Pre-Tax Reports (Accounting): Generates a specialized .xlsx file structured for real legal tax processes. It supports over 20+ fiat currencies (USD, EUR, PLN, etc.) and includes a current-moment 'Stocktaking' sheet (requires manual review and adjustments).
• 📊 Dashboard: A convenient built-in Profit Report table where you can set or modify prices for any transaction. Includes a Statistics bar showcasing your best/worst deals and average profits (per deal, day, week, month). The table is fully sortable and paginated (defaults to 500 rows per page).

📊 Marketplaces Coverage

Sorted from fully to partially supported.

Marketplace	Sell	Buy	Float	Sale Fees	Notes
DMarket	✅	✅	✅	✅ (Automatic)	Fully supported.
Buff163	✅	✅	✅	✅ (Automatic)	Fully supported.
BuffMarket	✅	✅	✅	✅ (Automatic)	Fully supported.
CSMoney (Market)	✅	✅	✅	✅ (Automatic)	Fully supported.
CSMoney (Trade)	✅	✅	✅	✅ (No fees)	Should be fully supported.
CSFloat	✅	✅	✅	✅⚠️ (2%)	Fully supported. Sale fee is an approximation.
Youpin*	✅	✅	✅	⚠️ (1%, Flat)	Opens a tab to retrieve cookies. Bulk trades track up to 3 items.
Skins*	✅	✅⚠️	✅	✅ (No fees)	Opens a tab to retrieve cookies. Buys are not tested, but should work.
Skinport*	⚠️	✅	✅	⚠️	Sell transactions and fees are not tested.
SkinSwap*	❌	✅	❌	✅	Only Market Buy is supported. Float data is unavailable.
SkinPlace	✅	❌	❌	✅ (No fees)	Only Sell is supported. Float data and loyalty bonus is unavailable.
Steam	❌	❌	✅	❌	Currently used only to check inventory for "Stocktaking" sheet in the Pre-Tax report.

• ✅ Fully / Automatically supported
• ⚠️ Partially supported / Limitations apply / Untested
• ❌ Not supported / Missing from API

👁️‍🗨️ Dashboard Preview

📦 Setup / Installation

1. Download the latest extension *.zip from the Releases page.
2. Unzip the archive to a folder on your computer.
3. Open Chromium-based browser (Chrome, Brave, Edge, Opera, etc.):
   • Go to chrome://extensions/ (or usually "Menu -> Extensions -> Manage Extensions").
   • Enable Developer mode (toggle in the top right corner).
   • Click Load unpacked.
   • Select the folder where you unzipped the extension.
4. Pin the extension and click the icon to open the dashboard!

Disclaimer: This tool provides a "Pre-Tax" report structure to assist you with tracking and accounting, but it does not replace professional tax advice. Always consult a certified accountant in your jurisdiction for final tax filings.

ℹ️ Important Notes:

1. Long Fetching Times: The extension fetches your FULL transaction history from each marketplace. The slowest platforms to fetch are:

   • Buff163 - 200 transactions per request (each taking ~3 seconds).
   • Youpin - 20 transactions per request.
   • CSMoney Market - 100 transactions per request.
   • Skins - 50 transactions per request.

2. Non-fetchable Items & Limitations:

   • Fetching non-CS2 items works only on DMarket, not tested on SkinSwap, SkinPlace and Skinport.
   • Steam Community Market & Trade Histories - Multi-currency complexity, missing float data, and rate-limits makes this unfetchable.
   • Skinport: Virtual Inventory/Store is unsupported; Seller history is untested (please verify and DM me if it does not work correctly).
   • SkinSwap: Trade, Insta-Sell and Balance - I do not trade or perform instant sales here. Balance here calculated as $0.
   • Other marketplaces - Too many exist to support all of them; I don't use all of them, and some have inconvenient history formats or other limitations.

3. Commodity & Trade Matching (Profit Report & Dashboard): Since commodity items (such as TF2,Rust,Dota items, CS Stickers, Containers, Graffitis, and Charms*) dont have float values, they cannot be matched. Their profit will be set to $0 until you manually enter both purchase and sale prices, after which their profit will recalculated automatically.

   *Charms have patterns, but they are not unique enough to be matched by only this attribute.

If you have any questions, suggestions, or found a bug, please write to Issues or message me on Steam.

Created for the CS2 trading community and enthusiasts by a CS2 trader

Developed as an interesting challenge and a useful tool.