Amazon Best Sellers & Movers Tracker

Track the top 100 Best Sellers in any Amazon category or sub-category — and see exactly what moved since your last run: climbers, new entries and products that dropped out.

Built for FBA sellers and affiliates doing winning-product research, where the interesting signal is not "what is #1 today" but "what is climbing fast".

No login, no API key. HTTP-only — no browser.

What a run gives you

{
  "rank": 41,
  "asin": "B088Z22VYF",
  "title": "Fire TV Stick 4K streaming device",
  "price": 24.99,
  "rating": 4.6,
  "reviewCount": 412903,
  "productUrl": "https://www.amazon.com/dp/B088Z22VYF",

  "previousRank": 71,
  "rankChange": 30,
  "movementType": "RISING",
  "isNewEntry": false,
  "isSignificantMove": true,

  "category": "electronics",
  "listType": "bestsellers",
  "marketplace": "com",
  "hasDetails": true
}

rankChange is positive when a product climbs (a lower rank number is better). Set onlyMovers: true and the dataset contains just the shortlist:

RISING       rank=41  prev=71  change=+30   Fire TV Stick 4K
FALLING      rank=6   prev=1   change=-5    Fire TV Stick 4K Plus
NEW_ENTRY    rank=81  prev=—   change=—     (new to the top 100)
DROPPED_OUT  rank=—   prev=77  change=—     (fell out of the top 100)

DROPPED_OUT products appear nowhere on Amazon's page by definition — they are only visible by diffing against the previous run.

⚠️ About "Movers & Shakers"

Amazon's own Movers & Shakers pages returned no data in any category tested (electronics, books, toys, home, beauty), each showing "Sorry, there are no movers and shakers available in this category."

So this actor computes the movers itself from rank snapshots between runs, which is more dependable than a page Amazon isn't populating — and gives you drop-outs too, which Amazon's page never showed. Amazon's own percentageChange fields are still read and passed through when present; they were empty throughout testing.

You can still select listType: movers-and-shakers; it will fail with a row telling you to use bestsellers rather than returning an empty dataset.

Input

{
  "categories": ["electronics", "toys-and-games", "electronics/172541"],
  "listType": "bestsellers",
  "marketplace": "com",
  "maxRank": 100,
  "trackMovement": true,
  "onlyMovers": false
}

Field	Description
categories	Slugs, sub-category node paths (electronics/172541), or full Amazon list URLs — a URL overrides marketplace and list type, so one run can mix marketplaces
listType	bestsellers (recommended), new-releases, most-wished-for, movers-and-shakers
marketplace	com, co.uk, de, fr, it, es, ca, com.au, co.jp, in
maxRank	Up to 100 (Amazon's ceiling). 50 costs one request, 100 costs two
trackMovement	Compare against the previous run and label every product
onlyMovers	Emit only significant moves, new entries and drop-outs
includeDroppedOut	Emit rows for products that left the list
stateStoreName	Named store for the snapshot — use different names for independent watchlists
delaySeconds	Pacing; Amazon serves CAPTCHAs to traffic it dislikes
proxyConfiguration	Residential recommended for scheduled runs

Read this before relying on the output

About 40% of rows carry rank + ASIN only. Amazon server-renders just 30 of the 50 product tiles per page; the rest lazy-load. Every product in the top 100 gets rank, asin and productUrl — but title, price, rating and reviewCount cover roughly 60 of 100. hasDetails marks which rows are complete, so filter on it if your pipeline needs price.

(A crawler User-Agent renders all 50 tiles, but that view drops price, rating and reviews entirely — measured 0/50 on each. More rows, less data, so it isn't used.)

Movement quality depends on run cadence. On the first run everything is NEW_ENTRY because there's nothing to compare against. Schedule it consistently — daily at the same hour works well — and the deltas become meaningful.

CAPTCHAs are reported, never solved. If Amazon challenges a request the actor retries with a rotated fingerprint and IP, then emits CAPTCHA_ESCALATION for that list and carries on with the others.

Known limits

• Rank 100 is Amazon's ceiling — no deeper list is served.
• Detail coverage ~60% per the tile split above.
• Amazon's own Movers & Shakers metrics are empty in practice.
• One snapshot per list per run; sub-hourly cadence will mostly capture noise rather than signal.

See CRAWLING_METHOD.md for the profile ladder results, the crawler-UA trade-off measurements, and the Movers & Shakers evidence.