CSTRADEUP Extension

Chrome extension for cstradeup.net — sync your Steam CS2 inventory and trade-up history to track your portfolio, analyze trade-ups, and claim cashback tickets.

Features

• Inventory sync — Automatically picks up your CS2 inventory from Steam and sends it to cstradeup.net so you can simulate tradeups with private skins.
• History crawl — Walks through your full Steam inventory history (trade-ups, storage unit moves, etc.) to provide a complete view of portfolio value over time and display statistics on past trade-ups.
• Cashback tickets — Claim tickets on trade-ups done after your join date. Uses TLSNotary to cryptographically prove the data came from Steam.

How it works

The extension runs offscreen scripts to steamcommunity.com on your behalf to fetch inventory and history data. Data is relayed to your cstradeup.net account and nowhere else.

For cashback tickets, we use TLS Notarization — a process that creates a cryptographic proof that inventory history genuinely came from Steam, without ever exposing your session cookies. This implementation was heavily inspired by CSFloat's extension, and we're very grateful for their work.

Privacy

Full details in PRIVACY.md.

Development

Setup

pnpm install

Build

# Production
pnpm run build:webpack

# Development (source maps, localhost:3000)
pnpm run dev

Load the build/ folder in Chrome via chrome://extensions → Load unpacked.

Acknowledgments

• CSFloat — the notarization flow in this extension is heavily inspired by their open-source implementation.
• TLSNotary — the protocol that makes trustless data verification possible.

License

MIT