By Rob Fogarty, Amazon FBA seller (OA and wholesale) and founder of Opero3P · October 2026
The Buy Box moves all day. A competitor drops a few cents, sells out, restocks, or raises their price, and the Buy Box can change hands in minutes. If your repricer only looks at the listing every so often, you spend the gap either priced too high to win or priced lower than you need to be.
This week Amazon approved Opero3P to receive live offer-change alerts, so I can finally put real numbers on how fast my repricer reacts. Here's what I measured, what actually makes a repricer fast, and why speed alone isn't the point.
The numbers
I measured the time from the moment a competitor's offer changed on one of my listings to the moment Opero3P decided what to do about it:
| Time | |
|---|---|
| Fastest | 7 seconds |
| Typical | 10 to 30 seconds |
| Slowest (normal running) | about 60 seconds |
After the decision, the new price goes to Amazon in a few seconds. Amazon then takes a few minutes to show it on the listing, and no repricer can speed that part up.
A real example from the first afternoon: a seller changed their offer on one of my listings. 57 seconds later, Opero3P raised my price from $38.99 to $43.42, because it saw there was no other Prime seller on the listing anymore. A repricer that only knows how to undercut would have left that money on the table.
What makes a repricer fast
There are two ways a repricer can find out the market moved:
- Checking on a schedule. Every so often it asks Amazon for the current offers on each listing. Simple, but anything that happens between checks waits for the next one.
- Listening for Amazon's alerts. Amazon can send an approved app a notification every time the offers on one of your listings change: price, shipping, a seller joining or leaving. A repricer that listens reacts to the change itself, not to a timer.
Opero3P does both. It reacts to Amazon's alerts within seconds, and it still runs a full check every 15 minutes as a backstop, so nothing is missed if an alert is late.
Why speed alone isn't the point
A fast repricer with a bad floor just loses money faster. The two things that matter more than speed:
It has to know your real cost. Most repricers only know the minimum price you typed in, and that number goes stale the moment your cost changes: a new purchase at a different price, prep fees, inbound freight. Opero3P sets each floor from the actual landed cost of the units you hold, so when your costs change, the floor changes with them. You can also set a minimum ROI or a minimum profit in dollars per product.
It has to know when not to drop. Some of the best moves a repricer makes are upward:
- Room above the Buy Box: when there's no other Prime seller, or the sellers ahead of you are about to run out, price above the Buy Box instead of matching it.
- Hold until live: while your stock is still inbound, hold a higher price instead of racing sellers who have units on the shelf.
- Crowded listings: when five or more Prime sellers sit within 1% of the Buy Box, match it instead of undercutting, so you don't start a race to the bottom.
The strategies it runs
I built these because my old repricers wouldn't. Each product gets its own:
- Auto: wins the Buy Box at the best price the listing allows, creeping back up when it can.
- Match Buy Box and Undercut next Prime seller.
- Go get sales: when a product hasn't sold in a while, steps the price down carefully to find what wins, never below your floor.
- Learning mode: tests prices and learns what actually wins the Buy Box on that listing.
- Hold, then reprice: holds a price for 30, 45 or 60 days before repricing.
- Yo-yo: at random times during the day, dips just under the cheapest Prime seller to grab the Buy Box and comes back up a few minutes later, or raises to see if other repricers follow.
- Your own rules: WHEN something happens on the listing, DO something, within LIMITS you set. Plus schedules, like a night-time lift.
Safety checks on every change
Fast is only good if it can't run away. Every price change in Opero3P goes through the same checks:
- Never below your floor, minimum ROI or minimum profit.
- At least 5 minutes between changes on the same listing.
- No single change bigger than 15%, unless it lands close to the Buy Box.
- No more than 25% total movement on a listing in a day.
- Amazon's own check runs first, before the real update.
- Every change, and every change it refused, is logged with the reason.
FAQ
How fast should an Amazon repricer react? Fast enough that you're never priced wrong for long. Reacting within a minute of a competitor's change is a good target. My repricer typically reacts in 10 to 30 seconds after Amazon's offer-change alert.
Do Amazon repricers react instantly? No repricer is instant. Amazon has to send the offer-change alert, the repricer has to decide, and Amazon takes a few minutes to show the new price on the listing. The part a repricer controls can be done in seconds.
Does a faster repricer always mean lower prices? No. A good repricer also raises your price when it can, for example when no other Prime seller is on the listing or competitors are running low on stock.
What is a repricer floor price? The lowest price the repricer is allowed to set. It should come from your real cost per unit plus fees and the minimum profit you want, and it should update when your costs change.
Can a repricer lose me money? Yes, if its floor is wrong or out of date. That's why the floor should be calculated from your actual landed cost rather than a number typed in months ago.
What is a yo-yo repricing strategy? Briefly dropping just under the lowest Prime seller to win the Buy Box and pick up a sale, then returning to the higher price a few minutes later. It works best on fast-moving listings.
Opero3P is my company. The timing numbers are from my own store in October 2026 and depend on Amazon's alert timing.