Product Price & Stock Monitor — Restock + Drop Alerts

Give it product page URLs and get told when the price or stock moves: it checks each page on a schedule, remembers what it saw last time, and writes what changed. Price up or down, back in stock, out of stock, a sale starting or ending, or the title changing under the same link.

It reads the structured data a store publishes about its own products: JSON-LD, Shopify's product JSON, WooCommerce data, or microdata. No HTML selectors to break. The flip side is the honest limit: a store that publishes none of that returns nothing useful, and you get a row saying exactly that.

Input	Product page URLs, with optional labels
Output	One row per product that is new or changed: current price, list price, sale flag, stock, title, and each change with its before and after
Ceiling	No fixed cap on the product list, so keep it to what a run can finish
Account needed	None from you
Price	$2.50 per 1,000 products checked, plus a fee for each change found. The free plan's $5 a month covers about 2,000 checks, fewer when changes are found

🔍 What Product Price & Stock Monitor does

Each run fetches every product URL, pulls the structured record out of the page, and compares it against the baseline it saved last time. The baseline lives in a named key-value store on your own account, so it survives between scheduled runs.

Six kinds of change are detected, and you can switch each family off: price_change, back_in_stock, out_of_stock, sale_started, sale_ended and title_change. A title change is the one people forget to watch, and it is how you catch a listing that has been quietly swapped for a different product under the same URL.

priceDropThresholdPct is worth understanding before you set it. At the default 0 every price move is recorded. Set it to 5 and a drop smaller than 5% is not reported, and the baseline still moves to the new price. So a product sliding 4% a run will never trip a 5% threshold, however far it falls in total. Price rises are always recorded whatever you set. If you want to catch slow slides, leave the threshold at 0 and filter on each change's pct yourself.

Alerts go out through webhookUrl. Slack and Discord formats are detected from the URL, and anything else gets the full JSON payload, which is what Zapier, Make and n8n want.

📋 What data you get from each product you monitor

What you get	Field
A stable key, your label and the URL	target, label, url
When it was checked, and how the data was read	checked_at, extraction_status, extraction_method, sync_status
The product right now: title, price, currency, list price, sale flag, stock and SKU	current
Each change, with its type and before and after values	changes, change_count
First time seen, or seen before with something different	is_new, is_changed
What went wrong, if anything	error

▶️ How to scrape product prices and stock on a schedule

1. Open Product Price & Stock Monitor and click Try for free.
2. Put your product URLs into Products to monitor, one object each, with a label you will recognise in an alert.
3. Turn Only new / changed since last run off for the first run so you can see the full shape.
4. Run it once, check the rows, then turn it back on.
5. Paste a Slack or Discord hook into Webhook URL and schedule it.

💰 How much does it cost to scrape product prices and stock?

$2.50 per 1,000 products checked, which is $0.0025 a product. Flat on every Apify plan, no volume tiers. On the free plan, the $5 Apify gives you each month covers about 2,000 checks, fewer in a run that finds changes. When something moves:

Event	Price
Product checked	$0.0025
Restock detected	$0.02
Price, stock, sale-end or title change	$0.015
Sale started	$0.015
Page had no structured data	$0.001
Run that found a change or delivered your webhook	$0.05

A product gets at most one change event per run, whatever moved. A URL that answers with an HTTP error is not charged at all, and the quiet-run notice row is free.

📥 What you give it

{
  "products": [
    { "url": "https://www.adafruit.com/product/3055", "label": "Raspberry Pi 3" },
    { "url": "https://www.allbirds.com/products/mens-wool-runners", "label": "Wool Runners" }
  ],
  "priceDropThresholdPct": 0,
  "onlyNewSinceLastRun": true,
  "webhookUrl": ""
}

Field	Default	What it is
products	none, required	One object per product: url is required, label is optional and is what appears in your alerts. The form opens with two examples.
priceDropThresholdPct	0	Ignore price drops smaller than this percentage. Read the note above before raising it.
onlyNewSinceLastRun	true	Emit only new or changed products. Turn it off to get every product's current state every run.
trackPrice	true	Detect price moves, with the old value and the percentage.
trackStock	true	Detect back in stock and out of stock.
trackSalePrice	true	Detect a sale starting or ending, from the compare-at price where the store publishes one.
trackTitle	true	Detect a title change under the same URL.
notifyOnRestock	true	Send the webhook when something comes back in stock.
notifyOnPriceDrop	true	Send the webhook on a price drop, respecting the threshold above.
webhookUrl	none	Slack, Discord, or any endpoint that wants the JSON.
proxyConfiguration	on, using Apify's own network	Most stores answer without it. Change it only if a storefront gates you by region.

📤 What you get back

A real row from a run on 22 August 2026:

{
  "target": "snap-www.adafruit.com-fda349aa961c",
  "label": null,
  "url": "https://www.adafruit.com/product/3055",
  "checked_at": "2026-08-22T07:52:20.183033+00:00",
  "extraction_status": "ok",
  "extraction_method": "json-ld",
  "sync_status": "ok",
  "current": {
    "title": "Raspberry Pi 3 - Model B - ARMv8 with 1G RAM",
    "price": 35,
    "currency": "USD",
    "list_price": null,
    "on_sale": false,
    "availability_raw": "http://schema.org/InStock",
    "in_stock": true,
    "sku": "3055"
  },
  "changes": [],
  "change_count": 0,
  "is_new": false,
  "is_changed": false,
  "error": null
}

Field	How to read it
current	The product as it is right now. list_price and on_sale are filled in only where the store publishes a compare-at price.
changes	One entry per detected move, each with a change_type and the before and after values. Empty when nothing moved.
extraction_method	json-ld, shopify, woocommerce or microdata, so you can see which source the numbers came from.
extraction_status	ok, no_structured_data when the page publishes none, or error when the store answered with an HTTP error.
availability_raw	The store's own wording, kept beside the tidy in_stock boolean so you can check it.
target	A stable key built from the URL. Use it to join runs together.

🧾 Reading the output

Row	How to spot it	Billed
A product	No _diagnostic key, and an extraction_status	when extraction_status is ok or no_structured_data
The run notice	_diagnostic: true and a status	no

On a quiet run with onlyNewSinceLastRun on, the only row you get is the notice, which reads status: "no_changes" and counts what was checked. That row is never billed.

Two things to know about status. A URL that answers with an HTTP error comes back with extraction_status: "error" and is not charged. And a page that answers normally but carries no structured data comes back as no_structured_data, billed at $0.001, which also covers a consent or interstitial page that answered in place of the product, so check the URL in a browser if a store you expect to work reports it.

💡 What people use it for

• Watching a sold-out item and getting a Slack ping the minute it is back, which is what back_in_stock plus notifyOnRestock is for.
• Tracking another store's list prices across a few dozen product pages, with the threshold at 0 so nothing is missed.
• Catching a supplier quietly relisting a different item under the same URL, using title_change.
• Watching when seasonal sales start and end across a set of stores, with sale_started and sale_ended.

From a Shopify catalogue to restock alerts, in three steps:

1. Run Shopify Products Scraper on the store and keep the url of the products you care about.
2. Paste them into Products to monitor here, one {"url": ..., "label": ...} each.
3. Put your Slack or Discord hook into webhookUrl and schedule the run.

🚧 What it does not do

• It needs the store to publish structured product data. No JSON-LD, Shopify, WooCommerce or microdata means no usable row.
• No HTML fallback. That is the design: selectors break silently and give you wrong prices.
• A price-drop threshold moves the baseline anyway, so a slow slide under the threshold is never reported. Leave it at 0 if that matters.
• No product search or discovery. You supply the URLs.
• No variant-level tracking. It reads the product record the page publishes, not every size and colour.
• No stock counts, only in stock or not, because most stores publish only that.
• No screenshots and no price history chart. The history is whatever you keep from the rows.
• The product list has no cap in the schema, so a very long list can run out of time. Split it across several scheduled runs.

🧭 Which monitor do you need?

If you want	Use
Restock and price-drop alerts on product pages you name	This one
Every product in a Shopify store's catalogue	Shopify Products Scraper
Which domains run Shopify, with each store's contact details	Shopify Store Leads
Target products with promotions and pickup stock	Target.com Product Scraper
Lowe's products with store price, stock and specs	Lowe's Product Scraper
Amazon products by keyword or ASIN, with the on-page reviews	Amazon Scraper

❓ Questions people ask

Will the price monitor work on any store?

Only on stores that publish structured product data, which is most Shopify and WooCommerce shops and a lot of others. Test one URL before you build a list on it.

How does it remember the last price?

A named key-value store on your own account holds the baseline between runs. Nothing is kept on our side.

What happens the first time?

Every product is new, so you get a full snapshot and no change events. Changes start from the second run.

Can I get Slack alerts?

Yes, paste your Slack hook into webhookUrl and the format is picked up automatically. Discord too.

Why did a price drop not alert me?

Check priceDropThresholdPct. A drop under the threshold is suppressed, and the baseline still moves.

Can I call it from code or connect it to an AI assistant?

Yes. The API tab has ready-made code for Python, JavaScript and the command line. For Claude, ChatGPT or another MCP client, connect https://mcp.apify.com/?tools=fetch-actor-details,dami_studio/structured-product-price-stock-monitor. Either way the run happens on your Apify account at the same price.

Is monitoring public product pages legal?

They are public pages and the data is what the store publishes about itself. Apify's write-up on the legality of web scraping is a sensible starting point, and we are not lawyers.

🆘 If something breaks

Open the Issues tab on the actor page. Send the run ID and the product URL; the row's extraction_status and extraction_method usually narrow it down on their own.