A working build · 2026
Identify a coin, value a collection — without leaving the photo.
A private numismatics tool. Two photos return an attribution, an NGC grade hypothesis, and a market value sourced from manual sale comps. Built solo on Next 15, Drizzle, and Claude.
Stack
Next 15 / Drizzle
Identification
Claude · vision
Pricing source
Manual comps
Coverage
US coins
What's interesting about the build
[ Placeholder — Pavel to supply 3–4 short paragraphs ]
Recommended angles: (1) why pricing went from eBay-API-driven to manual-observation-driven, after the Developer application was rejected; (2) the NGC accuracy harness and what it taught about Claude's vision limits on Presidential dollars; (3) the sum-of-parts vs as-set valuation split for proof sets; (4) one engineering decision worth defending — the URL-state filter system, the R2/Neon split, or the migration discipline.
Recommended angles: (1) why pricing went from eBay-API-driven to manual-observation-driven, after the Developer application was rejected; (2) the NGC accuracy harness and what it taught about Claude's vision limits on Presidential dollars; (3) the sum-of-parts vs as-set valuation split for proof sets; (4) one engineering decision worth defending — the URL-state filter system, the R2/Neon split, or the migration discipline.