Guide
On eBay, the lowest-priced listing in a competitive search often sells first. But "first" is decided by minutes, not days — when a competitor drops their price, whoever responds fastest captures the next buyer. Repricing speed is the mechanical edge that converts your competitive intelligence into actual revenue. The catch: speed without a floor is just a faster race to losing money. The only repricer worth running is one that reacts in real time and stops cold at the minimum price you can afford.
eBay's Best Match algorithm surfaces recently-priced competitive listings near the top of search. When a competing seller drops below your price, you may slip from position one to position three or four in seconds. If your repricer checks prices once every 24 hours, you can spend an entire day invisible to buyers who sort by price. Repricers that run every 15 minutes return you to the front of the results 96 times a day — coverage across every buying window, including lunch breaks, evenings, and weekend traffic peaks when conversion rates are highest. Undercut's Pro and Scale plans both run on this 15-minute cycle.
Speed is only an advantage if every reprice is still profitable. Before you turn on any repricer, calculate the absolute minimum price you can accept per listing — your hard floor. The formula: Floor = Cost + Shipping + (Sale Price × eBay Fee %) + Minimum Acceptable Margin.
Worked example for a used kitchen appliance: - Item cost: $8.00 - Estimated shipping: $4.00 - eBay final value fee: 13.25% of sale price (applied to the floor price of ~$17.14 ≈ $2.27) - Minimum margin: 15% of cost ($1.20) - Floor: $8.00 + $4.00 + $2.27 + $1.20 ≈ $15.47, rounded up to $15.50 for safety
Enter $15.50 as the hard floor in Undercut. No matter how fast the repricer fires, it will never push that listing below $15.50. Competitors can race each other to zero — you stop at profit.
Not every category needs the fastest possible cycle. Matching cycle time to category volatility keeps your repricer focused where responsiveness earns its keep.
Raw speed tells the repricer when to fire. Aggressiveness tuning tells it how far to move. A repricer set to maximum aggression always matches or beats the lowest competitor price instantly — optimal when you have genuine cost advantages. A more conservative setting might undercut by only $0.01, preserve margin on slow-moving inventory, or hold price when the lowest competitor appears to be a liquidator you cannot sustainably match.
Undercut's Pro and Scale plans include AI aggressiveness tuning that lets you set, per listing, how fast and how far that listing moves toward its floor — so you can hold a conservative posture on items where you would rather not chase every momentary undercut. This helps avoid the common failure mode where a fast repricer races a one-hour clearance price down toward the floor when you would rather wait the seller out.
Undercut's plans are built around listing count and the cycle speed your catalog demands. Matching plan to catalog size ensures you pay for the throughput you actually need.
Start your 14-day free trial with 25 live listings — set your hard floors first, then let Undercut do the rest. No credit card required.
Start freeHow often does Undercut actually reprice my listings — and does the cycle time vary by plan?
Reprice frequency depends on your plan. Pro and Scale both reprice every 15 minutes — the fastest cadence Undercut runs. Free and Starter plans reprice less frequently. If your category sees rapid intraday price swings — electronics, gaming, trending collectibles — upgrading to Pro is where the 15-minute cycle translates directly into more sales; move to Scale when your catalog outgrows Pro's 1,000-listing limit.
What stops the repricer from dropping my price below what I paid for the item?
Your hard floor. Before activating repricing on any listing, you set a minimum acceptable price per SKU. Undercut will never submit a price below that floor, regardless of what competitors do. The floor is enforced at the listing level, so different items in your store can have different floors based on their individual cost basis.
Will the Scale plan help me if I only have 50 listings?
No — Scale is about capacity (up to 10,000 listings) and priority support, not faster repricing. Pro and Scale reprice on the same 15-minute cycle, so a 50-listing catalog gains nothing from Scale. For most small catalogs, 15-minute repricing on a lower tier captures the meaningful competitive moves. Start on Free or Starter, monitor how often your listings are being undercut, and upgrade to Pro if you see consistent lag.
Can I set different aggressiveness levels for different parts of my catalog?
Yes. On the Pro and Scale plans, AI aggressiveness tuning can be set on each listing individually. You might set aggressive movement toward the floor on commodity items where you have a clear cost advantage, and conservative movement on unique or near-mint items where matching a liquidator's price makes no business sense.
Does repricing speed affect my eBay seller standing or trigger any account flags?
No. Undercut submits price updates through eBay's official API, which is the same channel eBay expects third-party tools to use. Frequent price updates are normal seller behavior and do not negatively affect your seller metrics or Best Match ranking.
Related: How to Avoid Selling Below Cost on eBay · Repricing Without Losing Margin · Electronics Repricing on eBay · What Is a Price Floor? · AI Repricing on eBay: How It Works