Amazon Category New-Entrant Watch

Amazon competitor analysis as a monitor: track a keyword search or category and get only the new competitor products (ASINs) that entered since last check — and which dropped out.

Which new competitor products just entered my Amazon category or search?

Give this Actor a search term or category URL and a monitorId. On each run it compares the current ASIN set against your saved baseline and returns only the new entrants — with title, brand, price, and the product URL as evidence — plus the products that dropped out. You learn what's new, not what ranks today.

When an MCP agent should use this

• "Which new competitor products entered my Amazon category this week?"
• "Alert me when a new ASIN shows up in my tracked keyword search."
• "Watch this Amazon search for new competitors before they rank."
• "Which products dropped out of and which entered my category?"

When to use something else

You want	Use instead
New size/color/pack variants on products you already track	Amazon Variant Launch Watch
Price / stock / buy-box / rating drift on known ASINs	a free Amazon product monitor
Opportunity scoring, sales estimates, or a product research / finder tool	a dedicated Amazon product research tool
A one-off pull of every product in a category	a raw Amazon category scraper

How it works

1. Collect — fetches the current products in each tracked search or category, with title, brand, and price.
2. Snapshot & diff — compares the ASIN set against your saved baseline for this monitorId.
3. Classify — turns each new ASIN into a new_entrant row and each gone ASIN into a dropped_off row.
4. Emit — writes export-ready rows (JSON / CSV / XLSX) and updates the snapshot.

Inputs

Field	Required	Example
searchTermsOrCategoryUrls	yes	["wireless gaming mouse", "https://www.amazon.com/s?k=mechanical+keyboard"]
marketplace	yes	"US"
monitorId	yes	"gaming-mice-niche"
mode	no	"check_for_changes" (default) or "reset_baseline"

Baseline run:

{ "searchTermsOrCategoryUrls": ["wireless gaming mouse"], "marketplace": "US", "monitorId": "gaming-mice-niche", "mode": "reset_baseline" }

Refresh run (the recurring job):

{ "searchTermsOrCategoryUrls": ["wireless gaming mouse"], "marketplace": "US", "monitorId": "gaming-mice-niche", "mode": "check_for_changes" }

Example output

A detected new entrant:

{
  "asin": "B0CXYZ1234",
  "marketplace": "US",
  "productTitle": "RGB Wireless Gaming Mouse",
  "brand": "Logitech",
  "price": 29.99,
  "firstSeen": "2026-06-05",
  "evidence": ["Not present in 2026-05-28 baseline ASIN set", "New entrant in 'wireless gaming mouse' search"],
  "sourceUrls": ["https://www.amazon.com/dp/B0CXYZ1234"],
  "snapshotDate": "2026-06-05",
  "changeType": "new_entrant"
}

Modes

• check_for_changes (default) — compare against the baseline and return which ASINs newly entered (and which dropped out). Auto-creates the baseline on the first run, so use this almost every time.
• reset_baseline — save a fresh starting point and report nothing. Use only to re-baseline after you intentionally changed the searches you monitor.

Billing

Event	Price	When
product-checked	$0.030	One product in the tracked category is checked against the ASIN baseline and a result row is emitted.

First 10 result rows of every run are free — track at least 30 products so billable rows clear the free tier.

FAQ

Is this an Amazon product research or competitor analysis tool?

It's the new-entrant layer of one — an Amazon product tracker for a niche. It doesn't score opportunity or estimate sales — it watches a fixed search or category for brand monitoring and tells you which competitor ASINs are new since your last check, with title, brand, price, and URL.

How is this different from a raw category scraper?

A raw scraper returns what ranks now. It can't tell you which products are new without remembering last week's set. This Actor holds the ASIN baseline across runs and diffs it, so you spot new entrants before they gain rank.

Can I track a keyword search and a category page together?

Yes. searchTermsOrCategoryUrls accepts plain keywords or full Amazon search/category URLs in the same list.

Does it tell me when a product leaves the category?

Yes — drop-outs come through as dropped_off rows alongside the new entrants.

Limits & support

• Tracks category entry and exit only — no keyword-rank / A9 position or BSR / sales-rank tracking.
• No price, stock, buy-box, or rating monitoring of known ASINs.
• The first run on a new monitorId is a baseline; the diff begins on the next run.
• A failed fetch is reported clearly, never silently treated as "no new entrants".