Hello Hive

Hello Hive,

I'm Melissa, the founder of Coin Error Expert.

I noticed a huge bottleneck in discovery to grading and auction house submissions, so I decided to solve the problem myself.

For the last few months, I’ve been building Coin Error Expert. I build the ultimate AI-powered tool for serious numismatists, coin roll hunters, and dealers.

Our app uses highly trained AI to evaluate U.S. coins and paper currency directly under your phone’s camera. For coins, it instantly attributes known errors and varieties—complete with strict diagnostic rules to prevent false positives on famously faked varieties (like the 1958 DDO). For paper currency, it scans banknotes to identify rare seal colors, star notes, and highly sought-after fancy serial number patterns (like radars, repeaters, and trinary patterns).

Beyond AI scanning, I also built The Vault, a dedicated low-fee marketplace where collectors can buy and sell their discoveries with a 5% commission rate, complete with seamless 1-click cross-listing to eBay.

Key Features

AI Variety Scanner: Instantly detect and attribute U.S. coin errors and varieties.

Banknote & Serial Number Scanner: Identify star notes, seal colors, and fancy serial number patterns on U.S. paper currency.

The Vault Marketplace: Buy and sell with a heavily reduced 5% commission rate compared to traditional auction sites.

Digital Collection Storage: Organize and store unlimited coins and bills in your digital vault.

Whether you are a casual coin roll hunter looking for pocket change fortunes or a professional dealer evaluating estate collections, this tool pays for itself on the first scan. I would love for you guys to test it out during our beta phase and give me your brutal feedback!