I built a small tool to calculate a maximum bid for €2 Proof / Reverse Proof auctions — looking for collector feedback
Hi everyone,
I collect €2 commemorative coins and I kept running into the same problem when looking at auctions:
A coin may look cheap at €20–30, but once buyer fees, shipping and recent sold prices are considered, it can actually be a bad deal.
So I built a small experimental tool called EuroCoin Radar.
For selected Proof and Reverse Proof €2 auctions it checks:
• current auction price
• buyer fees
• shipping
• recent sold comparable auctions
• estimated fair value
• a conservative maximum bid
It then gives the listing a simple:
🟢 BUY
🟠 WATCH
🔴 PASS
For example, during my latest test I found two identical Belgian SNCB Reverse Proof listings.
One was still attractive around €20.
Another had already reached €65, so the model marked it PASS even though the coin itself is scarce.
I'm currently testing the tool completely free and I'm mainly interested in feedback from actual euro coin collectors.
Would something like this be useful when you buy Proof / Reverse Proof coins, or do you normally calculate this yourself?
I have a small public prototype with three current examples if anyone wants to test it — I'll add the link below.
Any criticism is welcome, especially about the way fair value and maximum bids should be calculated.
EuroCoin Radar prototype