# Track competitor product prices and stock changes

**Use case:** 

Run a prefilled public Product JSON-LD price/stock monitoring example. Establish a baseline, reuse the same monitor ID on later checks and export changes. The alertSignal field does not send notifications. Static public HTML only.

## Input

```json
{
  "urls": [
    "https://scrapeme.live/shop/Pikachu/",
    "https://scrapeme.live/shop/Bulbasaur/"
  ],
  "monitorId": "pal-demo-competitor",
  "resetBaseline": false,
  "emitUnchanged": true,
  "minPriceChangePercent": 5,
  "referencePrices": {}
}
```

## Output

```json
{
  "sourceUrl": {
    "label": "Public product page",
    "format": "string"
  },
  "eventType": {
    "label": "Detected event",
    "format": "string"
  },
  "alertSignal": {
    "label": "Alert-worthy change",
    "format": "boolean"
  },
  "alertKind": {
    "label": "Alert kind",
    "format": "string"
  },
  "stockAlertKind": {
    "label": "Additional stock change alert",
    "format": "string"
  },
  "name": {
    "label": "Product",
    "format": "string"
  },
  "metadataSource": {
    "label": "Price metadata source (JSON-LD or Open Graph)",
    "format": "string"
  },
  "price": {
    "label": "Published price",
    "format": "string"
  },
  "referencePrice": {
    "label": "Your reference price",
    "format": "string"
  },
  "referenceGapPercent": {
    "label": "Competitor price gap (%)",
    "format": "number"
  },
  "referenceComparison": {
    "label": "Same-currency price comparison status",
    "format": "string"
  },
  "currency": {
    "label": "Currency",
    "format": "string"
  },
  "previousPrice": {
    "label": "Prior published price",
    "format": "string"
  },
  "priceDeltaPercent": {
    "label": "Price change percent",
    "format": "number"
  },
  "availability": {
    "label": "Published availability",
    "format": "string"
  },
  "previousAvailability": {
    "label": "Previous availability",
    "format": "string"
  },
  "identityAmbiguous": {
    "label": "Multiple offers lack distinct identifiers",
    "format": "boolean"
  },
  "checkedAt": {
    "label": "Checked at UTC",
    "format": "string"
  },
  "summary": {
    "label": "Deterministic summary",
    "format": "string"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Competitor Price Tracker & Stock Monitor | PAL Actor is ready to run with the inputs already set for "Track competitor product prices and stock changes". [Sign up or log in](https://console.apify.com/create-task-from-example/5JqHTC016fYEI87Mk) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Track competitor product prices and stock changes" task

The Competitor Price Tracker & Stock Monitor | PAL Actor will start running based on the input automatically. You can also change all the input fields, like competitor product urls, monitor id (persistent state), and more, to match your specific use case.

### 3. Receive the "Track competitor product prices and stock changes" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as public product page, detected event, alert-worthy change, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Track competitor product prices and stock changes" task via API](https://apify.com/practical_ai_lab_jp/pal-competitor-price-stock-delta.md).

## About this Actor

This example demonstrates how to use [Competitor Price Tracker & Stock Monitor | PAL](https://apify.com/practical_ai_lab_jp/pal-competitor-price-stock-delta.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/practical_ai_lab_jp/pal-competitor-price-stock-delta.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/practical_ai_lab_jp/pal-competitor-price-stock-delta.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).