The inventory system that runs a real card business.

I sell thousands of cards a month on eBay and TCGplayer. Spreadsheets broke and off-the-shelf software didn't understand how card sellers actually work, so I built my own. Live eBay sync, combine listings, lot-level profit tracking, pick lists, and a photo-to-listing matcher. Public access opens August 2026.

See what it does
inventory.leumascc.com · Private Access
Multi-tenant access — coming August 2026. Join the waitlist for first access and grandfathered pricing.
62,900
Active eBay Listings
179,000
Cards Tracked
6,200
Combine Listings Managed
12,800
Orders Tracked
$116K
2026 Sales Tracked
Live, platform-wide numbers across every seller on the system · updated in real time
What it does

Everything I needed to run the business, in one place.

Every feature here is live in my own store today — not a roadmap promise. This is the system that handles thousands of cards a month.

Live eBay sync

Listings, orders, and fees pulled straight from eBay's Trading and Finances APIs, with webhooks for near-real-time updates. Your numbers match eBay, automatically. Works with both eBay.com (US) and eBay.ca (Canada), in your own currency.

Live now

Combine listings

Merge a pile of the same card into one listing and keep a full breadcrumb of what went in. Pick lists route by storage location so you find every card fast.

Live now

TCGplayer cross-listing

Export to TCGplayer with delta-aware quantity sync, and guards that catch a mispriced card before it sells for a fraction of its value.

Live now

One inventory, every channel

Your inventory is the source of truth. List, sell, and reconcile the same stock across eBay and TCGplayer without overselling a card you only own once.

Live now

Lot & profit tracking

Real per-lot profit and loss, split down to the child SKU, with a full audit log. Know what each box actually made — not a rounded guess.

Live now

Automated repricing

Set your own pricing rules and let nightly market-based repricing keep your listings competitive while protecting your floor.

Live now

Card shows & buy-back

Run a card show from your phone — sell, trade, and buy on the table. Take in bulk collections with rate-based quotes that flow straight into inventory.

Live now

Reporting & audit trail

Dashboards, year-over-year, dead-stock aging, and a revert path on every bulk operation. Trust your own numbers when it counts.

Live now
Where it's going

Built feature by feature — and still building.

What's connected today, and what's next. Priorities come from real seller demand, not a pitch deck.

Connected today

eBay · TCGplayer · Discord · YouTube

Full eBay integration (US and Canada), TCGplayer cross-listing, a community on Discord, and the build journey on YouTube.

Next

More marketplaces

Mercari, Cardmarket (EU), and COMC are on deck once the multi-tenant core is rock solid.

Next

Sports cards at scale

A first-party sports catalog with visual parallel identification — the part no free data source does well.

Next

In-app shipping

Buy labels and close out orders without leaving the app, built around what card sellers actually ship.

See it in action

A full walkthrough is landing on the Leumas Card Craze YouTube channel — subscribe to catch it.

Full walkthrough video — coming soon
Subscribe on YouTube
Pricing

Fair pricing, locked at launch.

Final tiers go live with public access in August 2026. Waitlist members get first access and stay at their original rate.

Starter

For sellers under 500 active listings. Pricing announced at launch.

Pro

For high-volume sellers running eBay and TCGplayer together. Pricing announced at launch.

Enterprise

Custom integrations and dedicated support. Let's talk.

FAQ

Questions, answered straight.

If yours isn't here, ask me on Discord.

When does public registration open?
Target: August 2026 I'm finishing the multi-tenant foundation: per-seller data isolation, per-account eBay sign-in, encrypted tokens, and webhook routing for each seller. Get one of those wrong and one account could see another's data, so I'm not opening signups until it's verified airtight. Waitlist members get first access the day it's ready.
What will pricing look like?
Three tiers: Starter (≤500 active listings), Pro (sellers running TCGplayer and eBay together), and Enterprise (custom integrations, dedicated support). I'll lock final pricing before the August 2026 launch. Waitlist members get grandfathered rates — if prices go up later, you stay at your original tier price as long as you stay subscribed.
How is my inventory data isolated from other users?
Every business table (inventory, orders, combines, lots) carries a user_id and a row-level security policy enforced at the database layer, not in app code. So even if a future bug forgot to filter by user, the database itself would refuse to hand back another seller's row. That's the foundation I'm finishing now, and it's exactly why signups aren't open yet — I won't flip them on until it's proven airtight.
What data do you share with eBay or TCGplayer?
None. Leumas is a client of those marketplaces, not a data broker for them. Your inventory and sales data lives in a Postgres database only you can read. I use your eBay sign-in (OAuth, stored encrypted) to sync your own listings and orders — and I never aggregate or sell your data to anyone.
What if I'm coming from a spreadsheet?
Onboarding imports your active eBay listings automatically through eBay's API — no spreadsheet upload needed. Past sales backfill from eBay's Finances API, and TCGplayer comes in by CSV. I migrated thousands of my own listings off spreadsheets when I built this, so the import flow is made for the messy reality of a high-volume operation.
Do you support marketplaces besides eBay and TCGplayer?
Not yet. eBay and TCGplayer cover most US trading-card commerce, so they came first. Mercari, Cardmarket (EU), and COMC are on the roadmap but won't ship until the multi-tenant core is rock solid. If your business needs a specific marketplace, tell me on Discord — demand sets my priorities.
Can I export my data if I leave?
Yes, always. You can export your full inventory, orders, combines, lots, and audit log to CSV any time, right from the app. I don't believe in data lock-in — if Leumas ever stops working for you, your data leaves with you in a format you can take anywhere.
Who is behind Leumas Live?
That's me — Sam, eBay seller leumas1993, moving high volumes of Pokémon, baseball, basketball, football, Yu-Gi-Oh, and One Piece. Leumas started as my own inventory system after years of fighting spreadsheets, sync gaps, and paid software that didn't get how card sellers actually work. There's more in the founder story below.
Founder story

Built by a high-volume seller, not a VC-funded startup.

Hi, I'm Sam — eBay seller leumas1993. I move thousands of Pokémon, baseball, basketball, football, Yu-Gi-Oh, and One Piece cards every month across eBay and TCGplayer.

Leumas Live started as my own inventory system. Spreadsheets broke around 5,000 listings, and the paid tools I tried didn't understand combine listings, lot tracking, or the audit trails I needed to trust my own numbers. So I built what I needed, one feature at a time.

As you read this, my own store is running 15,999 active listings, 5,232 combine listings, and 4,610 tracked orders — pulled live from the system right now. It runs my entire business. Next, it runs yours.

Every feature here is one I built to fix a real problem in my own store — and one I still use every single day.

Community

Sellers are already in the room.

Seller testimonials go here as beta opens up. Until then, the conversation is live on Discord and YouTube — come watch the system get built in real time.

Contact

Come talk to me.

The fastest way to reach me is Discord. Prefer email? support@leumascc.com.

Join the Discord

Questions, feature requests, and first dibs on beta access — straight from me.

Join the Discord →