# Track Price Changes on Any Web Page

**Use case:** 

Enter a public page URL and the CSS selector of its price, and get the price, the change since the last check in percent and whether it reached your target. The example reads the first fee in the GOV.UK passport fees table, so the first run works as it is. Put the task on a schedule to get a new row at every check. No login and no API key.

## Input

```json
{
  "startUrls": [
    {
      "url": "https://www.gov.uk/passport-fees"
    }
  ],
  "sourceType": "feed",
  "idField": "recall_number",
  "itemsPath": "results",
  "webhookUrl": "https://hooks.example.com/changes",
  "selector": "main table",
  "priceSelector": "main table tbody tr:first-child td:first-of-type",
  "stockSelector": ".availability",
  "priceBelow": 100,
  "monitorName": "price-alert",
  "ignoreSelectors": [
    ".cookie-banner",
    "#live-clock"
  ],
  "ignorePatterns": [
    "Updated on .*",
    "\\d+ visitors"
  ],
  "maxDiffLines": 50,
  "maxUrls": 10,
  "resetBaseline": false
}
```

## Output

```json
{
  "url": {
    "label": "URL",
    "format": "string"
  },
  "status": {
    "label": "Status",
    "format": "string"
  },
  "changed": {
    "label": "Changed",
    "format": "boolean"
  },
  "summary": {
    "label": "Summary",
    "format": "string"
  },
  "price": {
    "label": "Price",
    "format": "number"
  },
  "currency": {
    "label": "Currency",
    "format": "string"
  },
  "availability": {
    "label": "Stock",
    "format": "string"
  },
  "checkedAt": {
    "label": "Checked at",
    "format": "string"
  }
}
```

## How it works

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

The Website Change Monitor: Diff, Price & Stock, $3/1K Actor is ready to run with the inputs already set for "Track Price Changes on Any Web Page". [Sign up or log in](https://console.apify.com/create-task-from-example/ItqCcjgfjx0GivpgK) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Track Price Changes on Any Web Page" task

The Website Change Monitor: Diff, Price & Stock, $3/1K Actor will start running based on the input automatically. You can also change all the input fields, like page urls, source type, and more, to match your specific use case.

### 3. Receive the "Track Price Changes on Any Web Page" 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 URL, status, changed, 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 Price Changes on Any Web Page" task via API](https://apify.com/conserving_celerytop/website-change-monitor.md).

## About this Actor

This example demonstrates how to use [Website Change Monitor: Diff, Price & Stock, $3/1K](https://apify.com/conserving_celerytop/website-change-monitor.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/conserving_celerytop/website-change-monitor.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/conserving_celerytop/website-change-monitor.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`).