🏆
Harper Hobbies
PSA ARBITRAGE RESEARCH
🔒
Unlock
Incorrect password. Try again.
Harper Hobbies
PSA Arbitrage Research
⚙️
🔍
Browse by Category
✕ Cancel
Analyzing cards…
Claude is searching eBay for current pricing.
Batch 0 of 3
Cancel
‹ Home
↻ Refresh
Card Search
Instant ROI Lookup
⚙️
Enter a card to analyze
🔍
Year · Player · Set · Card number
Target PSA Grades
5
6
7
8
9
10
PSA Submission Tier
Minimum ROI Target
2×
3×
4×
5×
Shipping Cost (all-in)
Buy + ship to PSA + return
$
Analyze Card →
Recent Searches
Watchlist
Saved cards
🗑️
🏠
Home
⭐
Watchlist
Settings
Cloudflare Worker URL
Paste the URL of your deployed cloudflare-worker.js here. The worker keeps your Anthropic API key secure server-side.
Category ROI Target
2×
3×
4×
5×
Minimum return used when filtering category results.
Default PSA Tier
Shipping Cost
All-in shipping (buy → PSA → return)
$
About
Category lists sourced from hobby community research (allvintagecards.com, sportscollectorsdaily.com, psacard.com).
Each category refresh = 3 Claude API calls (~$0.30–0.60). Results are cached for 24 hours per device.