I applied financial market-making logic (IBKR TWS) to eBay tech deals. Here is my free extension.

Hey everyone,

As a developer and hardware enthusiast, I got tired of doing manual price research and calculation every time I wanted to buy or flip used IT gear.

So I built a free browser extension that treats the used electronics market like a financial asset class. It acts like a mini Trading Workstation (TWS) directly overlaid on eBay:

• Real-time Valuation: Instantly calculates the weighted market median price using API data.

• Smart Risk/Condition Assessment: Runs background logic and OCR image checks (detecting everything from pristine chassis to minor wear like a slightly scratched asset tag).

• Instant Margins: Shows you the exact spread, target margin, and whether a deal is a "Green Signal" buy or not.

It’s completely free and works globally for anyone buying or selling tech. Would love to hear your feedback on the logic and the UI!

chrome: https://chromewebstore.google.com/detail/fehr-algorithmus-ebay-ana/jkhefpdlgmalpdpdlbaenckegagjhbda