Amazon Price Tracker: price drop and back-in-stock alerts

Amazon Price Tracker watches the price and stock of any Amazon products by ASIN and tells you what changed since the last check. Run it on an Apify Schedule (for example every 6 hours or daily). It remembers each product's price history between runs and can send price drop alerts and back-in-stock alerts to Slack, Discord or any webhook.

No database, no spreadsheet formulas and no Amazon API key. Add ASINs, schedule it, and get alerts.

What it does

Each run checks every ASIN on your list and compares it with the previous run:

• Price drop and price increase with the change in money and in %
• Back in stock and out of stock events
• Lowest and highest price seen, plus an isLowestEver flag
• One alert message per run to Slack, Discord or your endpoint, for drops above your threshold and for restocks
• Works on 11 marketplaces: amazon.com, .ca, .co.uk, .de, .fr, .it, .es, .co.jp, .com.au, .in, .com.mx

Who it's for

• Amazon sellers and brands: watch competitor prices and stock-outs on the products you compete with.
• Deal hunters and resellers: get notified when a product hits a new low or comes back in stock.
• Repricing and analytics teams: build a price history dataset without running your own scraper.
• Agencies: one watchlist per client using trackerName.

Why this Actor

• Change detection built in. Most Amazon scrapers give you today's price only, and you have to diff it yourself. This tracker stores state in your Apify account and returns the event (price_drop, back_in_stock, ...) with previous price, change and lowest/highest price.
• Alerts out of the box. Paste a Slack or Discord webhook URL; no Zapier or Make needed. Other endpoints get the full JSON.
• Real local prices. The proxy country is pinned to the marketplace and the local currency is requested, so you see what a local shopper sees instead of a "doesn't ship to your country" page.
• Fewer false alerts. Captcha and empty pages are retried with a new session instead of being recorded as "out of stock". You set the minimum drop % that triggers an alert.
• Flat, predictable price. $0.009 per product checked. No monthly rental.

How to use

1. Add ASINs (e.g. B0764MS2Q2) or full Amazon product URLs.
2. Pick the Marketplace the products belong to.
3. Optional: paste a Slack or Discord webhook URL and set the drop threshold (default 5%).
4. Click Start. The first run records starting prices (event: "first_seen").
5. Open Schedules in Apify Console and run it every few hours or daily. Each later run reports changes and sends alerts.

Example input:

{
  "asins": ["B0764MS2Q2", "https://www.amazon.com/dp/B000GTFOBA"],
  "marketplace": "com",
  "dropThresholdPercent": 5,
  "webhookUrl": "https://hooks.slack.com/services/XXX/YYY/ZZZ",
  "onlyChanges": false,
  "trackerName": "my-watchlist",
  "proxyConfiguration": { "useApifyProxy": true, "apifyProxyGroups": ["RESIDENTIAL"] }
}

Tip: turn on Output only changes to keep the dataset small. Unchanged products are then skipped in the dataset (they are still checked).

Output sample

{
  "asin": "B0764MS2Q2",
  "title": "Nutricost Vitamin D3 5,000 IU (125mcg), 240 Softgels, GMO-Free",
  "url": "https://www.amazon.com/dp/B0764MS2Q2",
  "price": 10.95,
  "currency": "$",
  "inStock": true,
  "availability": "In Stock",
  "event": "price_drop",
  "previousPrice": 12.95,
  "change": -2,
  "changePercent": -15.44,
  "lowestPrice": 10.95,
  "highestPrice": 12.95,
  "isLowestEver": true,
  "alert": true,
  "marketplace": "com",
  "checkedAt": "2026-10-17T08:00:00.000Z"
}

Field	Description
event	first_seen, price_drop, price_increase, back_in_stock, out_of_stock or no_change
alert	true if this row triggered an alert (drop at or above the threshold, or back in stock)
price, currency	Current price and currency symbol
previousPrice, change, changePercent	Price at the last check and the difference
lowestPrice, highestPrice, isLowestEver	Price range seen by this tracker, and whether today is the lowest
inStock, availability	Stock flag and Amazon's stock text
asin, title, url, marketplace, checkedAt	Product and check details

Webhook message. One POST per run when there are alerts. The JSON body has text (Slack), content (Discord) and the full alerts array. Slack/Discord message example:

Amazon price alerts (1)
🔻 -15.44%: Nutricost Vitamin D3 5,000 IU ... — $12.95 → $10.95 (lowest ever) https://www.amazon.com/dp/B0764MS2Q2

Pricing

Pay-per-event. You pay only for products checked:

Event	Price
Price check (one product checked: price, stock and history update)	$0.009
Actor start	$0.00005 per GB of memory, once per run

Worked example. You watch 10 ASINs once a day for 30 days: 10 x 30 = 300 checks x $0.009 = $2.70 per month. Checking 10 ASINs every 6 hours costs 4 times that, $10.80 per month.

The run stops by itself when it reaches the maximum charge you set for the run.

API and integrations

Python (pip install apify-client):

from apify_client import ApifyClient

client = ApifyClient("<YOUR_APIFY_TOKEN>")
run = client.actor("deanko/amazon-price-tracker").call(run_input={
    "asins": ["B0764MS2Q2"],
    "marketplace": "com",
    "dropThresholdPercent": 5,
})
for row in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(row["asin"], row["event"], row["price"], row["previousPrice"])

JavaScript / Node.js (npm install apify-client):

import { ApifyClient } from 'apify-client';

const client = new ApifyClient({ token: '<YOUR_APIFY_TOKEN>' });
const run = await client.actor('deanko/amazon-price-tracker').call({
    asins: ['B0764MS2Q2', 'B000GTFOBA'],
    marketplace: 'com',
    onlyChanges: true,
});
const { items } = await client.dataset(run.defaultDatasetId).listItems();
console.log(items.filter((r) => r.alert));

You can also send results to Google Sheets, Make, Zapier, n8n or email from the Integrations tab.

FAQ

Is it legal to track Amazon prices? The Actor reads only publicly visible product pages (price, title, stock). It doesn't log in and collects no personal data. You are responsible for using the data lawfully and in line with the terms that apply to you.

Where is the price history stored? In a key-value store named amazon-price-tracker in your own Apify account, one record per tracker name and marketplace. Nothing is shared with other users.

Why does the first run show no alerts? The first run only records starting prices (first_seen). Alerts start from the second run.

Can I track products from several countries? Yes. Run one task per marketplace. History is kept separately for each marketplace.

How do I get alerts by email? Use an Apify integration or a Make/Zapier webhook that forwards the alerts array to email.

Do I need a Keepa or Amazon API subscription? No. Prices come directly from the public product page at the time of each check. Earlier history starts when you start tracking.

Limitations

• History starts from your first run; past prices before that are not available.
• The price is the main (buy box) price shown on the product page. Other sellers' offers and coupons are not collected.
• A product with no price shown is treated as out of stock.
• Prices can vary slightly by delivery location within a country.

Support and feedback

Found a bug or need another field? Open an issue in the Issues tab. Include a run link if you can. Feature requests are welcome.

Related Actors: Amazon Product Scraper (search, ASIN details, reviews), Amazon Keyword Rank Tracker, Amazon Best Sellers Tracker.