Your Buy Box lost to a competitor. A hijacker on your listing. Amazon changing your description. A listing search suppressed, with Amazon's reason. A fee that quietly went up. SentryKit catches it in real time and tells you which changes are actually costing you money.
14 days free, no card. Then $19/mo · unlimited ASINs · every marketplace · See pricing →
🇬🇧 🇩🇪 🇫🇷 🇮🇹 🇪🇸 Prices in your marketplace's currency, across 22 Amazon marketplaces.
“The notification arrived even before I saw it in Seller Central, so perfect!”
“Really like how you listen … I definitely recommend including few of the community groups I’m in.”
“…the change details are very clear, with the ‘before/after’ comparison making everything easier to interpret.”
One flat price per storefront. Unlimited ASINs, every marketplace included — no per-ASIN bills as your catalog grows.
“The team is starting to wake up and everybody is interested!”
“They offer FBA fee alerts along with customizable listing alerts, restriction monitoring and reporting. We’ve found it very useful…”
Selling in the UK and across Europe, or in North America? SentryKit monitors every listing in every marketplace you sell in — and speaks your sellers' language.
22 marketplaces · more being added regularly
Pick a category to see the alert that lands in your inbox. Each one says what changed, who's on the listing, and Amazon's own reason when Amazon gives one. Every signal is also in our Amazon product monitoring library.
The alert names the seller, their price, fulfilment and feedback. Mark authorised resellers once and they stop showing up as threats.
You get the issue code and the field Amazon named, so you know what to fix. When Amazon gives no reason, we say so rather than guess.
main_product_image_locatorgeneric_keywordcountry_of_originTitle, images, bullets and the backend fields buyers never see. Each change shows the old value, the new one, and the raw Amazon field name.
Losing to another seller and Amazon showing no Featured Offer at all come as separate alerts, because the fix is different.
Old fee next to new fee, for each ASIN, as soon as it changes. Catch a wrong re-measure early instead of finding it in your payout.
Low stock means little on its own. The alert puts units left next to your current sales pace, so you know how many days you really have.
Account Health Rating, defect and shipping rates, and new policy or IP complaints, flagged while there's still time to act.
New and negative reviews, star rating drops and seller feedback, so a product problem doesn't pile up for weeks.
Badges, Best Seller Rank and Subscribe & Save status change quietly. You hear about it when it happens.
14 days free, no card. Every signal is included on every plan, and every alert is customizable.
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.
Your biggest threats are hijackers, unauthorised resellers, and listing changes you didn't make. When a hijacker appears on your ASIN, you need their feedback rating, 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.
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.
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.
Start with 14 days free. Every plan includes all 50+ signals, unlimited ASINs, every marketplace, and the full API and webhooks. Your price is based on one simple thing — how many storefronts you run.
| Storefronts | Per storefront | Volume saving |
|---|---|---|
| 1–5 | included in base | — |
| 6–15 | +$19 each | — |
| 16–30 | +$14 each | ~26% lower |
| 31–60 | +$10 each | ~47% lower |
| 61+ | +$7 each | ~63% lower |
Managing many client accounts? Custom volume pricing with white-label alerts, consolidated invoicing, an uptime SLA, and a dedicated onboarding partner — from ~$199/mo.
No hard cutoffs, ever. Unlimited ASINs, orders and marketplaces on every plan — only storefronts affect your price. The API and webhooks are included on every plan, and there are no overage charges: if you pass your monthly call allowance we slow you down for the rest of the cycle, we never bill you. Your coverage keeps running through Q4 peaks and flash sales.
Amazon, other sellers and your own team change your listings every day, usually without telling you. Amazon listing monitoring watches every ASIN you sell and alerts you the moment something that affects sales or margin changes, with what changed and why.
It is automated tracking of your Amazon listings for changes you did not make or did not expect: a lost Buy Box, a new seller on your ASIN, a listing that drops out of search, an edited title or main image, a higher FBA fee. Instead of checking Seller Central by hand, you get an alert with the before and after, and Amazon's stated reason where Amazon gives one.
50+ signals on every plan: Buy Box lost and won (and lost vs suppressed as separate alerts), hijackers and new sellers, search suppression with Amazon's reason, issue code and field name, title, bullet, image, category and variation changes with before and after, FBA fee changes old vs new, price changes, stock, reviews, and account health (AHR, ODR, late shipment rate). See every signal in the Amazon product monitoring library.
Yes. Connect each storefront once and SentryKit runs automated Amazon catalog health monitoring on every ASIN, with no per-ASIN limit, across 22 Amazon marketplaces with prices in the local currency. Alerts can be routed per storefront or per brand, so each team only sees its own listings.
Alerts are real time: SentryKit acts on Amazon's live notifications rather than a once-a-day check. They arrive by email, Slack, Microsoft Teams or ClickUp, and every plan includes webhooks and a REST API.
The main differences are check speed, pricing model and depth: some listing monitors check on a schedule and price per ASIN, while SentryKit alerts in real time with flat per-storefront pricing and unlimited ASINs. We compare all five tools on pricing, alert speed and coverage in Amazon listing monitors compared.
Yes. Turn any alert type on or off, set your own thresholds (for example, how big a sales drop should trigger an alert), tag sellers as authorised, watchlist or ignore so resellers you trust stop setting off alerts, and send each alert to email, Slack, Microsoft Teams, ClickUp or a webhook, per storefront or brand. Not sure what to watch? Tell us what matters and we'll help you tune it.
From $19/month, with unlimited ASINs. Start with a 14-day free trial, no credit card needed. See pricing.
50+ signals on every listing, with what changed and why on every alert. 14 days free, then $19/mo. Cancel anytime.
Start free — 14 days, no card →