API · Webhooks · Every plan

An Amazon monitoring API built on your own seller account.

SentryKit watches your account health, policy violations, Buy Box, hijackers, FBA fees, stock and listing changes. Each alert goes to the person or tool that deals with it: email, Slack, Teams, ClickUp, Google Sheets, Claude, ChatGPT or your own systems. Every plan, from $19/month, in 22 Amazon marketplaces.

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No credit card required

We help you set it up

No per-alert charges

What SentryKit catches, and where it sends it

Because SentryKit connects to your Seller Central account, an alert tells you what changed and why: the reason Amazon gave, the fee before and after, who took the Buy Box. Nobody has to go and look it up.

Account health

Your Account Health Rating or account status changing, in each marketplace.

Policy and compliance issues

New IP complaints, listing or restricted-product policy violations, safety and authenticity complaints, warnings and document requests.

Buy Box losses

Who took it, the price gap, and whether price, fulfilment or stock caused it. Buy Box alert

Hijackers and unauthorised sellers

The seller name and ID as soon as they join your listing. Hijacker alert

FBA fee changes

The old and new fee for each ASIN, so overcharges get spotted and claimed. FBA fee alert

Low stock

FBA and FBM stock crossing the level you set, before the listing runs dry.

Suppressed listings

Which listing, in which marketplace, and the reason Amazon gave. Suppression alert

Listing changes

Title, images, category or parent ASIN, before and after. Listing change alert

Competitive price

When Amazon's price check against other retailers drops below your price. Competitive Price alert

Price changes

Your own price and your competitors' prices, tracked separately. Price change alert

Sales stopping

A product going a set number of hours without a sale.

Where alerts go

Email to each teammate, with their own alerts, brands and timing
Slack, Teams or ClickUp channels, one per brand or client
Google Sheets as a running log
Claude or ChatGPT, to ask questions about your accounts
n8n, Make or your own systems through webhooks
Reports and dashboards through the API

Why the API matters: email and Slack tell a person. The API hands the same alert to your other tools as data they can sort and act on, and lets you pull the history whenever you need it: every Buy Box change, price move and alert, by ASIN, account and marketplace.

How brands and agencies use it

Brand with several teams

Each team gets only the alerts it acts on

Everyone works from one SentryKit account and picks their own alerts, brands and timing (real time, daily or weekly).

Compliance

Account health changes and new policy violations or IP complaints, for the marketplaces they cover.

Listings

Competitive price and listing change alerts for their brands, in real time.

Pricing

Buy Box losses with who took it and by how much, in their Slack channel.

Finance

FBA fee changes logged to a sheet by ASIN. On Pro, the FBA fee reimbursement report lists the orders to claim.

Inventory

Low-stock alerts in time to send more units in.

Owner

Hears about account status changes straight away, gets a daily or weekly digest, and asks Claude when something looks off.

Already using a profit tool? SentryKit explains the drops it shows. A higher FBA fee, a lost Buy Box or a stock-out gets flagged the day it happens, and can go to the same sheet your finance team uses.

Agency

Every client account in one place

Connect all client accounts once. Every alert names the client account and marketplace.
See account health and policy issues for every client, so a slipping account is caught before the client calls.
Send each client's alerts to its own Slack channel or ClickUp list, so the right account manager picks it up.
Pull a month of alerts per client for reports, without exporting from Seller Central.

Ask about your accounts in plain English

Connect SentryKit to Claude or ChatGPT and ask the questions you'd normally answer with an export and a spreadsheet. We set up the connection with you.

Brand · ChatGPT

Which of our UK listings lost the Buy Box this week, and why?

Three. Two went to the same reseller, who undercut you by £1.00 on Monday. The third went out of stock on your side on Wednesday, so that one needs inventory, not a price change.

Agency · Claude

Did any client's account health change this week?

One. Client B's Germany account went from Good to Fair after two new listing policy violations on Tuesday. Everyone else is unchanged. Want the violation details for the client call?

How it compares with tools you may already use

Most teams already have a research tool, and Amazon's own assistant lives inside Seller Central. SentryKit does a different job: it keeps watch on your accounts and listings in every marketplace and gets each alert to whoever fixes it.

Tool	What it's for	Account health alerts	API access	Alerts sent to your tools
SentryKit	Watching your own accounts and listings: account health, policy issues, Buy Box, hijackers, FBA fees, stock, listing and price changes	Yes, per marketplace	Every plan, from $19/month	Yes: email, Slack, Teams, ClickUp, Sheets, webhooks
Amazon Seller Assistant (Claude plugin)	Asking about and acting on your Seller Central data, with workflows you set up	Yes, inside Seller Central	Free. The Claude plugin is in beta for US stores	Workflows inside Amazon's tools
SellerSonar	Listing monitoring	Not listed	From the Business plan, $74.98/month	Webhooks on Enterprise
Keepa	Price and sales-rank history for any product	No	Paid token plans	Price and stock tracking
Helium 10	Product and keyword research	Not listed	Claude/ChatGPT connection on Diamond and above, 1,000 calls/month	None listed
Jarvio	AI operations assistant for Amazon brands	Yes: performance metrics and policy warnings	None listed	Slack, email, task tools, webhooks
Jungle Scout	Market and keyword research	Not listed	First 100 requests free, then from $29/month	No

Checked October 2026 on each company's own pricing, API and help pages.

Keep Keepa or Jungle Scout for research and Amazon's assistant for quick questions. Add SentryKit to keep watch on your accounts and listings and get each alert to the person who fixes it.

We set it up with you

Tell us where your team works, whether that's Claude, ChatGPT, ClickUp, Slack, n8n, Make, a sheet or your own systems, and we'll connect SentryKit to it. Every plan, from $19/month, with a 14-day free trial and no credit card.

Start 14-day free trial See pricing

Questions about the SentryKit API

Yes. SentryKit has an API and webhooks for Amazon seller alerts. Alerts can go to your own tools as they happen, and you can pull alerts, tracked ASINs, Buy Box history and competitor price history at any time. Both are included on every plan.

Every plan, from $19/month, including the 14-day free trial with no credit card. There's no sales call, add-on or per-alert charge.

Yes. SentryKit alerts when your Account Health Rating or account status changes in a marketplace, and when new policy issues appear: IP complaints, listing and restricted-product policy violations, product safety and authenticity complaints, warnings and document requests. Each alert can go to the person who handles it, or to Slack, Teams, ClickUp, Claude or your own systems.

Amazon's notices go to whoever is set up on that one seller account. SentryKit checks the account health report for every account you connect every few hours and tells you exactly what changed, for example: Germany, listing policy violations 0 to 2, rating Good to Fair. That change goes straight to the person who deals with it, and an agency sees every client's accounts in one place.

Yes. Once connected, you can ask questions like whether any account's health changed this week, which listings lost the Buy Box and why, or which FBA fees went up this month. We set up the connection with you, based on how your team wants to use it.

Yes. Each brand, client or team can have its own channel or list, and each person can choose which alerts they get and how often. We help you set it up.

Yes. Alerts can be sent to any of them as they happen, with the ASIN, marketplace, seller account and alert details. We can help you build the workflow.

Amazon's plugin lets you ask about and act on your Seller Central data, and it's in beta for US stores. SentryKit keeps a constant watch on Buy Box, hijackers, FBA fees, stock, suppressions and listing changes across all your accounts and 22 marketplaces, and sends each alert to the person who handles it. Many teams use both.

Keepa's API covers price and sales-rank history for any product, paid in tokens. SellerSonar's API starts on its Business plan at $74.98/month, with webhooks on Enterprise. SentryKit's API is on every plan from $19/month and works from your connected seller account, so alerts include details like account health changes, the reason Amazon gave for a suppression, your old and new FBA fee, and your stock when the Buy Box changed hands.

Yes. Keep Keepa for research and your profit tool for margins. SentryKit tells you when something changes on your listings, like an FBA fee increase or a lost Buy Box, and can send it to the same sheet or dashboard.

All 22 Amazon marketplaces SentryKit monitors. Every alert names its marketplace and seller account, so one setup covers your US, UK, EU and other stores.

A REST API with an API key, and webhooks signed with HMAC-SHA256. Failed deliveries are retried for up to 12 hours, each alert keeps one ID across retries, and every delivery is logged. Keys and webhooks are created in Settings, and you can send a test event before going live.

All 50+ alerts For agencies SellerSonar alternative Pricing