Guide
At 500 or more active listings, the math changes. You can't manually review every price, and a single misconfigured rule can silently erode margin across hundreds of SKUs overnight. The answer isn't faster hands — it's a per-listing hard floor on every item, so the repricer can chase competitors aggressively while never crossing the minimum you set. This guide shows exactly how to structure that, including the floor formula that keeps every sale profitable, and where automation stops so your margins don't.
Below 100 listings, a single flat rule — beat the lowest price by 2% — works well enough. Above 500, it doesn't, for two reasons. First, your catalog is heterogeneous: a lot of electronics might carry 8% margin while a vintage camera lot runs 35%. A single repricing posture across the whole catalog punishes your high-margin inventory. Second, listing churn accelerates: new competitors appear, old ones sell out, and buy-box positions shift faster than any weekly review cycle can track. High-volume repricing requires a hard floor on every item, with the floor calculated from each item's own cost so the repricer can chase competitors without ever crossing it.
Before you configure a single repricing rule, calculate the hard floor for each item. The formula is: Floor = (Item Cost + Shipping Cost) / (1 − eBay Fee Rate − Minimum Margin Rate). For a practical example: cost $8.00, shipping $4.00, eBay fees 13.25% (a typical combined rate for most categories including FVF and PayPal/managed payments), minimum acceptable margin 15%. Floor = ($8 + $4) / (1 − 0.1325 − 0.15) = $12 / 0.7175 = $16.73. Round up to $16.74 to avoid rounding-down losses at scale. In Undercut, you set this as the hard floor on that listing. The repricer will never go below it — not even if a competitor lists at $10.00. At 1,000 listings, running this formula once per SKU (easily done in a spreadsheet export) takes less time than recovering from a week of below-cost sales.
Every listing carries its own hard floor, which is the real control layer for high-volume sellers. You set each listing's Floor Price in the dashboard, and Undercut respects that specific floor on every reprice. This matters when your catalog spans categories with very different fee structures or cost bases. A book category might carry 13% eBay fees; a collectibles category might carry 10%. A floor that's safe for your highest-fee category leaves money on the table in lower-fee categories, so calculating the right number per listing — rather than reusing one figure everywhere — is what protects margin without underpricing.
Repricing speed is only a meaningful lever in fast-moving categories. On a 1,000-listing electronics catalog where competitors sell out and relist within hours, a 15-minute repricing cycle (Undercut Pro and Scale both run on this cadence) is often sufficient — most buy-box shifts stabilize within one cycle. For categories like trading cards, sneakers, or trending media where inventory moves in minutes, the 15-minute cycle still keeps you from extended periods of being undercut, because the engine matches or beats a competitor's drop within one check rather than the next time you log in. The counterintuitive rule: responsive repricing on thin-margin, high-competition listings is where it pays most. On high-margin, low-competition listings, slower cycles cost you nothing and reduce unnecessary price changes that confuse buyers browsing your store. As your catalog grows, Scale's value is capacity (up to 10,000 listings) and priority support, not a faster cycle.
Undercut Pro and Scale include per-listing AI aggressiveness tuning, which sets how fast and how far each listing moves toward its hard floor. It does not read sell-through, stock levels, or demand — you set the aggressiveness, and the AI controls the pace and depth of the move toward the floor you already defined. For high-volume sellers, that means a listing you expect to clear can be set to move aggressively toward its floor, while a high-margin item you'd rather hold can be set to move conservatively. As a unit ages and you decide to move it, you raise its aggressiveness or lower its floor yourself — the tuning never escalates on its own, and your hard floor is never crossed.
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How do I set floor prices across my entire catalog?
Undercut imports your active listings when you connect your eBay account, then you set the Floor Price on each listing in the dashboard. The practical workflow is to calculate floors in your own spreadsheet first so you have the right number ready for each item, and to update a listing's floor in the dashboard whenever your costs change.
What happens if every competitor lists below my floor?
Your listing stays at your floor price and will not undercut further. You won't win the buy box in that moment, but you also won't execute a loss-making sale. Undercut is designed on the assumption that a sale below floor is worse than no sale at all.
How do I set safe floors when my catalog spans multiple categories with different fee rates?
Set each listing's floor from its own category fee rate — because floors are per-listing, a lower-fee media item can carry a lower floor than an electronics item, and each stays protected. For a fast start, floor everything using your highest-fee category's rate, then revisit the lower-fee listings to recover the margin a blanket number leaves behind.
Does the Scale plan reprice faster than Pro, and does the cadence apply to all my listings?
No — both Pro and Scale reprice on the same 15-minute cycle, and that cycle applies across every listing on your plan. Scale's advantage is capacity (up to 10,000 listings) and priority support, not a faster cycle. Choose Scale when your catalog size exceeds Pro's 1,000-listing limit, not because you expect quicker repricing.
Will AI aggressiveness tuning ever override or ignore my floor?
No. The hard floor is inviolable — AI aggressiveness tuning controls how aggressively Undercut positions your price relative to competitors, but all adjustments are calculated above the floor. The AI cannot instruct the repricer to cross the floor under any circumstances.
Related: How to Avoid Selling Below Cost on eBay · What Is a Price Floor? · Repricing Without Losing Margin · Multi-Listing Repricing Strategy · AI Repricing on eBay