Card Seller Tool
Trading card prices don't wait for you. A hot Pokemon alt-art or a rookie card can swing 20–40% in a single afternoon when new sales comps roll in. Manually checking competitors every few hours is a full-time job on top of your actual grading, sourcing, and listing work. Undercut watches every listing you have, finds the lowest live competitor price, and undercuts it automatically — but only down to the floor you set per card, so a sudden market crash never forces you to sell a PSA 10 below your buy-in cost.
Most eBay repricers were built for commodity retail — the same SKU repeated a thousand times. Trading cards don't work like that. A Charizard Base Set is not the same listing as a Charizard Base Set PSA 9, and neither is comparable to a raw lightly-played copy. Three different comps, three different floors, three different competitive landscapes. Undercut lets you set a hard floor on each individual listing, not just a blanket percentage rule. That matters when a graded card trades at 3x its raw counterpart and you can't afford to let a blanket 5%-off rule collapse your graded inventory into raw pricing territory.
A raw near-mint Mew ex might comp at $18. The same card in a PSA 10 slab might comp at $65. If your repricer doesn't know the difference — or worse, doesn't respect the floor you paid for that slab — you're one competitor price-drop away from selling a $40 graded card for $17. With Undercut, you enter a hard floor for every listing: your cost, plus eBay's 13.25% TCG fee (eBay's special category rate for trading cards), plus a minimum margin. The repricer will race to the bottom on your behalf, but it physically cannot cross that line. Floor-first design is the whole point.
When a card gets announced for a tournament meta — say a new Elden Beast in One Piece TCG or a newly discovered print error — comps on eBay can jump or crash within two hours of the announcement. A repricer that only checks once a day is essentially useless for active card sellers. Undercut's Free plan reprices hourly, which catches most intraday moves. If you're actively flipping during spoiler season or tournament weekends, the Pro plan's 15-minute cycle ($79/month, up to 1,000 listings) is worth it. You're not trying to win every millisecond like a stock trader — you just need to not wake up having sold twenty copies at yesterday's price when today's comp is 30% higher.
eBay's trading cards category carries a 13.25% final value fee (applied to item price, shipping, and tax) for most card sales, compared to the 13.6% rate in many other categories. That half-point difference sounds minor, but on a $200 graded card it's a dollar, and across a month of volume it adds up. More importantly, your floor calculation has to use the right fee or you'll systematically under-floor your listings. The free eBay fee calculator at /ebay-fee-calculator lets you plug in your card's sale price and see the exact fee before you set your floor. Set floor wrong once and you can lose money on every sale while thinking you're profitable. It's worth spending five minutes getting this right per card tier.
Before you can set a floor, you need to know what the card is actually selling for — not what it's listed at, but what it last sold for. The free price checker at /ebay-price-checker pulls recent sold comps so you can see the actual market, not just aspirational listings. For trading cards specifically, it helps you separate the raw comps from the graded comps that pollute search results. Once you have a realistic sold price, you can subtract the 13.25% fee, your shipping cost, and your minimum margin to land on a defensible floor. Doing that math manually is slow; Undercut's profit calculator at /ebay-profit-calculator automates the subtraction so you get a floor number in seconds.
14-day Starter trial, no card. Undercut competitors automatically — never below your minimum.
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Can Undercut handle both raw and graded versions of the same card separately?
Yes. Each eBay listing gets its own floor and repricing rules in Undercut, regardless of what the title says. A raw LP Charizard and a PSA 9 Charizard are two separate listings with two separate floors. There's no shared rule that groups them. You set the floor individually, which is the only safe approach when graded copies trade at 2–4x the raw price.
What happens when a card crashes and every competitor is below my floor?
Undercut holds your price at the floor and does not reprice below it. You won't win the sale at that moment, but you won't sell at a loss either. You can review your floor manually — maybe the crash is permanent and your buy-in cost needs to be written down — but that's your decision to make, not something the repricer does automatically. The floor is a hard wall, not a soft suggestion.
Is the 14-day trial enough to test repricing on my card inventory?
For most card sellers, yes. The Starter trial gives you 100 listings and hourly repricing for 14 days with no credit card required. That's enough to run your top 50–100 singles through a full repricing cycle and see how the floors hold up. If you have sealed product alongside singles, you may want to prioritize which listings to load first during the trial period to get representative data.
Does Undercut work for sports cards and MTG, or only Pokemon?
Any trading card listed on eBay in the trading cards category works. Pokemon, MTG, One Piece TCG, sports cards (NBA, NFL, MLB), wrestling cards — the repricer doesn't care about the game, it cares about the eBay listing. The 13.25% TCG fee applies across the trading cards category, so your floor calculation method is the same regardless of which game you're selling.
How does Undercut compare to manually repricing with eBay's bulk edit tool?
eBay's bulk edit requires you to export, edit a spreadsheet, and re-import — typically a 20–30 minute process that you'd have to repeat multiple times a day to stay competitive on hot cards. Undercut runs continuously in the background with no manual steps after the initial setup. For sellers with 50+ active listings, the time savings alone justify the cost within the first week of use.
Related: eBay Fee Calculator · How to Set an eBay Price Floor · eBay Price Checker · Avoid Selling Below Cost on eBay