A title edited, an image swapped, a hijacker on your ASIN, a suppressed listing, a price move, low stock, the Buy Box slipping — SentryKit tracks every signal the moment it happens. Monitoring is the insurance your listings need.
First month free, then $15/mo flat · unlimited ASINs · every marketplace
The best sellers don't react faster — they know first, and they know what they're looking at. SentryKit watches every signal on your listings in real time and delivers each one with context: what changed, who caused it, and what it means for your margin. A hijacker worth fighting, or a three-day-old account that'll be gone by the weekend. A real Buy Box loss, or a suppression that needs Seller Central — not a price cut. Half the competitors who undercut you aren't worth matching, and SentryKit tells you which half. You act on facts, the moment they matter — not days later, from the revenue.
Won, lost, or suppressed — with the exact price gap, competitor fulfillment type, and whether matching is above your floor.
New seller on your ASIN profiled instantly — account age, feedback, FBA/FBM — so you know a real threat from noise.
Title edited, main image swapped, category changed, search results suppressed — each one affects Buy Box eligibility directly. SentryKit catches every change before it costs you ranking or revenue.
FBA stock tracked against your live sales velocity — including units in transit. Get alerted before stock depletion hits your Buy Box eligibility, not after. A quiet day in sales doesn't go unnoticed either.
The precise dollar amount between your price and the Buy Box winner. Not an estimate — the exact number, so you know whether a $1.50 move wins it back or a $6 drop is needed.
Set your minimum based on landed cost. Every single alert shows whether matching to win the Buy Box is above your floor or below it. Intelligence, not autopilot.
FBA or FBM, feedback score, fulfillment type — for every competing offer. A zero-feedback FBM seller undercutting by $11 is a completely different situation from an established FBA brand $1.50 below you.
Every signal, one platform — the coverage your listings have been missing.
Most tools watch one or two signals. SentryKit covers everything that can quietly cost you — across Buy Box, competitors, listing health, content, inventory, badges and pricing — all at once, for every product in your portfolio. One blind spot is all it takes. This is the coverage that closes them.
What you need to watch depends on how you sell. Private-label brands face hijackers and listing tampering. Wholesale fights a crowded offer landscape. Online arbitrage runs thin margins at high velocity. Agencies juggle all of it across many accounts — SentryKit tunes its alerts to each.
Your biggest threats are hijackers, unauthorised resellers, and listing changes you didn't make. When a hijacker appears on your ASIN, you need their account age, feedback count, and fulfillment type in the same alert — not just that they're there.
You're competing on someone else's ASIN with sellers who know the listing as well as you do. Knowing their FBA status, account standing, and how their price compares to your floor changes your entire pricing strategy for how to win the buy box.
OA is high velocity with tight margins. Amazon inventory alerts that catch stock depletion early and sales velocity drops that signal a Buy Box problem before your payout report does — that's the difference between a profitable month and a write-off.
Managing multiple seller accounts means listing health across all of them — not 15 separate dashboards. Every issue flagged before a client notices a revenue dip. Separate enterprise pricing for agencies managing 5+ accounts.
Every tier includes all 20+ alert types. Start with 30 days free — then $15/mo flat, unlimited everything.
No hard cutoffs — ever. If orders spike during Q4 or a flash sale and you exceed your monthly limit, alerts keep running. You'll see a clear dashboard notification. We're not in the business of going dark when you need us most.
Wherever you sell on Amazon, SentryKit monitors your Buy Box. Connect multiple marketplaces to one account.
20+ marketplaces · more being added regularly
I manage 6 seller accounts. The portfolio-level view is the thing — I know every morning what needs attention across all my clients before any of them message me. Buy Box status, stock warnings, listing issues in one place.
Caught a hijacker on a Sunday night within minutes. My old tool flagged it Monday morning. The price floor feature is the thing I didn't know I needed — I can see whether matching actually makes sense before doing anything. I've stopped three unnecessary price wars since switching.
After my repricer made some unexpected moves overnight I needed something that showed me what was happening without automating anything else. SentryKit is exactly that — visibility without interference. I use both now.
Every critical event fires the moment it happens. By the time your morning coffee brews, you've already responded.
Every single alert — Buy Box Lost, Competitor Price Change, Price Floor Breach — shows your margin floor alongside the gap. Match or hold is your call, made with full context.
Account age, feedback count, FBA or FBM — every competing offer profiled. Know before you decide.
20+ alert types. Full context on every alert, your price floor always visible. 30 days free, then $15/mo flat.
Start free — then $15/mo flat →