# Seiko Watch Price Drop Monitor on Mercari Japan

**Use case:** 

Seiko watch price drops on Mercari Japan are easy to miss when listings change every day. This example runs as a named monitor against active Seiko watch searches and emits only new or changed listings, including the direction of any price move, on each scheduled run. Watch flippers catch a price cut without rechecking the search page. Pair it with Apify's Scheduler for a recurring alert feed.

## Input

```json
{
  "keywords": [
    "セイコー 腕時計"
  ],
  "sort": "score",
  "order": "desc",
  "status": [
    "on_sale"
  ],
  "shippingPayer": "any",
  "fetchItemDetails": false,
  "maxItemsPerQuery": 25,
  "maxResults": 25,
  "monitorMode": true,
  "monitorName": "seiko-watch-price-drops",
  "emitUnchanged": false,
  "proxyConfiguration": {
    "useApifyProxy": true
  }
}
```

## Output

```json
{
  "monitoring_change": {
    "label": "Change",
    "format": "string"
  },
  "price_change": {
    "label": "Price direction",
    "format": "string"
  },
  "changed_fields": {
    "label": "Changed fields",
    "format": "array"
  },
  "previous_values": {
    "label": "Previous source values",
    "format": "object"
  },
  "title": {
    "label": "Title",
    "format": "string"
  },
  "price": {
    "label": "Price",
    "format": "number"
  },
  "listing_status": {
    "label": "Listing status",
    "format": "string"
  },
  "source_query": {
    "label": "Source query",
    "format": "string"
  },
  "updated_at": {
    "label": "Updated at",
    "format": "string"
  },
  "url": {
    "label": "Listing",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [Mercari Japan Scraper: Listings and Prices](https://apify.com/getascraper/mercari-japan-scraper.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/getascraper/mercari-japan-scraper.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/getascraper/mercari-japan-scraper.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`).