Amazon Best Sellers Tracker — Rank Movement & New Entrants

The top-100 list is on the page for anyone to read. The value is in the movement.

A product entering the chart, or climbing 40 places overnight, is a trend starting — and that is what sellers, brands and sourcing teams actually watch for. This keeps a snapshot between runs and tells you what changed.

Covers 16 marketplaces and all three Amazon charts: Best Sellers, New Releases, and Movers & Shakers.

What you get beyond the list

Field	Description
movement	new_entrant · climbing · falling · unchanged
climbedBy	Places gained — positive means it moved up. (Rank deltas are inverted and easy to misread, so this is stated the human way.)
signal	breakout · surging · rising · steady · easing · sliding · new
note	What that move usually means — e.g. a sharp fall suggests a stock-out, a price rise, or a new competitor
previousRank	Where it was last run
rank · asin · title · price · currency · stars · reviewCount · url	The listing itself

Drop-outs — products that were on the chart and no longer are — are listed in QUALITY_REPORT.

Signals are position-weighted. A new entrant at rank 3 is a breakout; the same event at rank 87 is just new. A 6-place climb inside the top 10 matters more than a 6-place climb at rank 60.

Input

{
  "categories": ["electronics", "home-garden"],
  "country": "us",
  "listType": "bestsellers",
  "trackRankChanges": true
}

Category slugs come from any Best Sellers URL. Full URLs work too.

Run it daily — that's the point. The first run has nothing to compare against, so everything is a new_entrant; the second run is where the data starts. Set moversOnly: true to turn a 100-row chart into a short list of what actually changed.

⚠️ Two honest limits, both verified on real runs

1. Amazon does not serve the whole chart in HTML

Amazon server-renders about 30 of each 50-item page; the rest load with JavaScript and are simply not in the response. Measured on a real run with pages: 2: ranks 1–30 and 51–80 came back, and 31–50 were absent.

This actor tells you which rank numbers are missing in QUALITY_REPORT rather than handing you 60 rows labelled "top 100". A partial chart presented as complete is how you end up with wrong trend analysis.

2. Amazon prices are geolocated

Prices follow the exit IP, not the domain. During development amazon.com returned prices in PKR, and an incorrectly configured proxy returned CAD — both from the US site.

So the currency is parsed from the page, never assumed, reported on every row, and QUALITY_REPORT.currencyWarning fires if it doesn't match the marketplace. The default proxy is Apify residential in the marketplace country, which is what makes it come back correct.

If you see an unexpected currency, your proxy country is wrong — the actor will say so rather than quietly giving you numbers in the wrong money.

Sample output

[
  {
    "rank": 4,
    "asin": "B0DCH8VDXF",
    "title": "Apple EarPods Headphones with USB-C Plug",
    "price": 17.99,
    "currency": "USD",
    "stars": 4.5,
    "previousRank": 22,
    "climbedBy": 18,
    "movement": "climbing",
    "signal": "surging",
    "note": "Up 18 places to rank 4. Sharp moves near the top usually mean a promotion, a review spike, or a competitor going out of stock.",
    "category": "electronics",
    "status": "ok"
  }
]

Typical uses

• Product research — new entrants are demand signals before the category gets crowded.
• Competitor monitoring — know the day a rival's product starts climbing, not the month after.
• Brand protection — a sudden fall usually means a stock-out or an unauthorised seller undercutting you.
• Sourcing and dropshipping — Movers & Shakers is the fastest-moving demand signal Amazon publishes.
• Trend datasets — daily snapshots build history that cannot be back-filled later.

Pricing

$2.00 / 1,000 products ($0.002 per result), plus a near-zero start fee. A daily run over 5 categories costs a few cents a month. Never charged beyond maxItems.

FAQ

• Do I need a proxy? Yes, effectively. Amazon blocks datacenter IPs and geolocates prices. The default (Apify residential, matched to the marketplace) is already set.
• Why only ~30 products per page? See the limit above — it's Amazon, not the parser, and the missing ranks are reported.
• Can I get the full top 100? Set pages: 2 for ranks 1–30 and 51–80. The lazy-loaded ranks cannot be retrieved from HTML.
• How often should I run it? Daily. Two runs an hour apart mostly measures noise.
• Does it work outside the US? Yes — 16 marketplaces, and the proxy country follows automatically.

Related actors

• Amazon Product Scraper — full detail for any ASIN you find here.
• Amazon Reviews Scraper — voice-of-customer on a product that is climbing.
• App Store Charts Tracker — the same movement-tracking idea for mobile apps.