Repricing Trading Cards on eBay When the Market Moves Every Single Day

Why Card Prices Demand Automated Repricing

Card markets are reflexive and fast. Sold comps that were accurate last week can be meaningfully wrong today, and the spread between the lowest active listing and the last sold price is often where the next sale happens. If you list a few hundred singles and reprice by hand, you simply cannot revisit each one often enough to stay at the front of search as the market moves. A repricer that continuously beats the lowest comparable live listing — while never crossing the floor you set for that exact card and condition — does the watching for you. That is the difference between catching the momentum on a spiking card and missing it because your price was a day behind.

• Tournament results and set releases can move singles 10-30% in a day
• Raw and each graded tier are distinct products with distinct floors
• The lowest active listing, not the last sold, usually wins the next sale
• Hundreds of singles make manual comp-checking impossible to sustain

Floor a Card by Its Real Cost Basis — Including Grading

For raw cards, your floor is cost plus shipping, fees, and margin. For graded cards, the floor must also absorb grading cost and the time and risk you took to submit. Worked example for a card you bought raw and graded:

Card cost (raw): $20.00 Grading cost (per card, all-in): $19.00 Shipping (carded, tracked): $5.00 eBay final value fee: 13.25% Minimum margin target: 15%

Floor = (Card + Grading + Shipping) / (1 - FVF% - Margin%) = (20 + 19 + 5) / (1 - 0.1325 - 0.15) = 44 / 0.7175 = $61.32

Round up to $61.99 and that is your floor for the graded copy. Your raw copies of the same card get a separate, lower floor without the grading line. Undercut reprices each down to beat its comparable competitors but never below its own floor.

• Graded and raw copies of the same card get separate floors
• Roll grading cost (and submission risk) into the graded floor
• Use tracked, carded shipping cost — not a flat guess
• Revisit floors as your replacement cost for the card changes

Match Like-for-Like: Grade, Grader, and Condition

A PSA 10 should not be repriced against a PSA 9 or a raw copy, and a card graded by one company should not blindly chase another grader's pricing. The cheapest 'comp' eBay shows you is frequently not the same product. Because every Undercut listing is clamped to its own floor, a non-comparable low can never force you below profitability — at worst you hold at your floor. The practical workflow for a card seller is to set accurate per-listing floors, keep grade and grader explicit in the listing, and let the repricer compete within the right tier instead of chasing the absolute lowest number on the page.

Repricing Cadence for Spikes and Slabs

During a spike, minutes matter — the lowest live listing changes fast and the sale goes to whoever is at the front when a buyer with cash shows up. A tight repricing cycle keeps you there. Undercut's Pro and Scale plans both reprice every 15 minutes, which suits sellers actively trading hot singles. For a slower long-tail inventory of commons and mid-value slabs, daily repricing on the free or Starter plan is plenty. Many card sellers split the difference: a focused, frequently-repriced set of high-value cards plus a larger, lightly-repriced long tail, scaling the plan to the listing count. Scale's edge over Pro is capacity (10,000 listings) and priority support, not a faster cycle.