01
Record the buy
Capture the card or sealed product, its source, quantity, and the cost that starts its story.
Built for card sellers
Monkey Margin
Know what you actually made.
Track inventory, grading, sales, and the costs in between—so you can see the real margin behind your card business.
For sports-card and TCG sellers moving beyond the spreadsheet.
The number that matters
The sale price is not the profit.
The original purchase, grading, marketplace fees, and shipping rarely live in the same place. That makes a strong sale feel clear while the actual result stays fuzzy.
Monkey Margin keeps the operating history connected, helping you separate money still tied up in inventory from profit you have actually realized.
How it works
Follow the card. Keep the costs with it.
One dependable lifecycle from acquisition to realized result.
02
Track what happens next
Keep inventory status, grading activity, and added costs connected as the item changes.
03
See the real result
Tie the sale back to cost basis, fees, and shipping to understand the margin you actually realized.
Operational clarity
More than a collection total.
Collection apps focus on what a card might be worth. Listing tools focus on getting it online. Monkey Margin helps you understand the business between the buy and the final payout.
Inventory lifecycle
One card, one connected history
1
Acquired
Purchase and source recorded
2
Grading
Submission activity and costs attached
3
Returned
Grade and certification connected
4
Sold
Proceeds and selling costs reconciled
Real margin
Sale proceeds − acquisition − grading − fees − shipping
Made for the hobby as it operates
Business discipline without enterprise weight.
Inventory lifecycle
Built around the inventory card sellers actually carry
Keep raw cards, graded cards, sealed products, and card lots in one operational view without flattening them into generic retail stock.
Grading continuity
Let grading change the card—not erase its history
Follow submissions and returns while keeping the original purchase and relevant grading costs attached to the resulting inventory.
Realized results
Connect the payout to the costs behind it
Bring cost basis, marketplace fees, shipping, and other tracked selling costs into the same picture as the completed sale.
Built from real use
Built because the spreadsheet stopped being enough.
Monkey Margin grew from the real operating workflow behind Lucky Monkey Cards, a father-and-son card business tracking raw purchases, grading decisions, sealed inventory, marketplace sales, and true profitability.
It is being shaped into software other card sellers can make their own: familiar with the hobby, careful with the numbers, and focused on the work that happens between buying and getting paid.
Early access
Your cards are already working. Your numbers should too.
Join the Monkey Margin beta and start building a more dependable view of your card business.