# Shopify Price & Stock Monitor — Track Any Store's Products (`vertaizen/shopify-price-monitor`) Actor

Track competitor prices, stock & new products in any Shopify store via its public products.json. Monitor mode returns only CHANGES — price drops, out-of-stock, back-in-stock, new launches.

- **URL**: https://apify.com/vertaizen/shopify-price-monitor.md
- **Developed by:** [Diego Moragues](https://apify.com/vertaizen) (community)
- **Categories:** AI, E-commerce, Automation
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $2.00 / 1,000 products

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event

## What's an Apify Actor?

Actors are a software tools running on the Apify platform, for all kinds of web data extraction and automation use cases.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

In JavaScript/TypeScript projects, use official [JavaScript/TypeScript client](https://docs.apify.com/api/client/js.md):

```bash
npm install apify-client
```

In Python projects, use official [Python client library](https://docs.apify.com/api/client/python.md):

```bash
pip install apify-client
```

In shell scripts, use [Apify CLI](https://docs.apify.com/cli/docs.md):

````bash
# MacOS / Linux
curl -fsSL https://apify.com/install-cli.sh | bash
# Windows
irm https://apify.com/install-cli.ps1 | iex
```bash

In AI frameworks, you might use the [Apify MCP server](https://docs.apify.com/platform/integrations/mcp.md).

If your project is in a different language, use the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).


# README

## Shopify Price Monitor — Track Prices, Stock & New Products in Any Shopify Store

This **Shopify price tracker** and **competitor price monitoring** tool extracts the full product catalog of any Shopify store — prices, sale prices, stock availability, new arrivals — straight from the store's public `products.json` endpoint. No browser, no proxies, no fragile HTML scraping. Point it at your competitors' Shopify stores and get clean, structured **e-commerce pricing data** in seconds. Enable **monitor mode** and it becomes a **price change alert system**: scheduled runs return only what changed since the last run — price drops, price increases, out-of-stock events, back-in-stock restocks, and newly launched products.

### Why track Shopify stores directly?

- **Nearly every Shopify store exposes `/products.json` publicly** — the same data that powers the storefront, in clean JSON.
- **Real-time competitor pricing** — see price changes the moment your scheduled run fires, not days later via a pricing tool's crawl cycle.
- **Stock-outs are opportunities.** When a competitor's bestseller goes out of stock, that's your window. When your reseller's price drops below MAP, that's your alert.
- **AI-agent ready** — flat input, clean JSON output. Works out of the box via MCP for AI agents and LLM pipelines.

### What you get for each product variant

```json
{
  "store": "www.allbirds.com",
  "productId": 4547069902916,
  "title": "Men's Wool Runners",
  "handle": "mens-wool-runners",
  "url": "https://www.allbirds.com/products/mens-wool-runners",
  "vendor": "Allbirds",
  "productType": "Shoes",
  "variantId": 39250875613252,
  "variantTitle": "10",
  "sku": "WR2MNBG100",
  "price": 110,
  "compareAtPrice": 125,
  "available": true,
  "createdAt": "2020-01-14T10:42:00-05:00",
  "updatedAt": "2026-07-01T08:12:33-04:00",
  "imageUrl": "https://cdn.shopify.com/s/files/1/1104/4168/products/wool-runner.jpg",
  "checkedAt": "2026-07-02T12:00:00.000Z"
}
````

In **monitor mode**, each item additionally carries a `changeType`:

- `baseline` — first run for a store: the whole catalog is output and remembered.
- `new-product` — a variant that wasn't in the catalog last run.
- `price-change` — with `oldPrice`, `newPrice` and `priceChangePct` (e.g. `-12.5` for a 12.5% price drop).
- `stock-change` — with `stockStatus`: `back-in-stock` or `out-of-stock`.

### How to use it

1. **Add stores** — full URLs (`https://www.allbirds.com`) or bare domains (`gymshark.com`).
2. **(Optional) Set a product cap** — `maxProductsPerStore` (default 250, max 2000).
3. **(Optional) Enable monitor mode** and **schedule the actor** (e.g. daily at 6:00). The first run seeds the memory; every run after that outputs only real changes.
4. **Add a webhook** on run-succeeded to push price drops and stock alerts to Slack, email, Zapier, or your repricing engine. Filter on `changeType: "price-change"` with a negative `priceChangePct` to alert on price drops only.

### Use cases

- **Competitor price tracking**: monitor rival Shopify stores daily and undercut or match automatically.
- **MAP compliance monitoring**: watch resellers' prices and get alerted the moment anyone lists below your minimum advertised price.
- **Reseller & dropshipping sourcing**: spot price drops and clearance (`compareAtPrice` > `price`) across supplier stores.
- **Back-in-stock alerts**: get notified when a sold-out product returns — for buying, or for timing your own promotions against a competitor's stock-out.
- **New product launch detection**: `new-product` items reveal a competitor's roadmap the day it ships.
- **AI agents**: feed structured pricing data to LLM workflows via the Apify MCP server — every Apify actor is callable as an agent tool.

### Pricing

Pay per product checked — one event per product variant delivered to the dataset. No subscription, no minimum. Failed stores are never charged.

### FAQ

#### Is it legal to read a store's products.json?

The actor reads the same public, unauthenticated JSON endpoint that powers each store's own storefront and is served to any visitor. No login, no personal data, no rate-limit abuse — requests are throttled to one page per 500 ms with a descriptive user-agent.

#### Which stores work with this actor?

Any Shopify store with a public `/products.json` endpoint — which is the vast majority of Shopify stores. If a store is password-protected or has disabled the endpoint, it is reported in the run's `FAILED` record instead (and you're not charged for it).

#### How does monitor mode work exactly?

The actor keeps a per-store map of `{variantId: {price, available}}` in a persistent named key-value store (`SHOPIFY-MONITOR-STATE`). On each run it compares the live catalog against that map and outputs only differences, then updates the map. The very first run for a store outputs the full catalog tagged `changeType: "baseline"` so you have a starting snapshot.

#### How many products can it fetch per store?

Up to 2,000 products per store (`maxProductsPerStore`, default 250). Pagination runs at 250 products per page — Shopify's maximum — with a 500 ms politeness delay between pages. Note that output rows are per *variant*, so a store with 100 products × 5 sizes yields up to 500 rows.

#### Why do some stores fail?

Three common reasons: the store is password-protected (pre-launch or members-only), the merchant disabled the public `products.json` endpoint, or the domain isn't actually a Shopify store. Failed stores appear in the `FAILED` record of the run's key-value store with the reason — they never appear in the dataset and are never charged.

#### How do I schedule daily monitoring with alerts?

Create the actor task with your store list and `monitorMode: true`, add a Schedule (e.g. every morning), then attach a webhook or an Apify integration (Slack, email, Zapier, Make) to the run-succeeded event. Because monitor mode outputs only changes, every dataset item in a scheduled run is actionable — filter on `changeType` to route price drops, stock-outs and new launches to different channels.

#### Can AI agents use this actor?

Yes — the input schema is flat and agent-friendly, and every Apify actor is consumable via the Apify MCP server, so agents can call it as a tool ("check if any competitor dropped prices today").

# Actor input Schema

## `stores` (type: `array`):

Shopify store URLs or bare domains. Examples: `https://www.allbirds.com`, `gymshark.com`. Any store with a public `/products.json` endpoint works (the vast majority of Shopify stores).

## `maxProductsPerStore` (type: `integer`):

Safety cap on the number of products fetched per store (each product may have several variants; every variant row counts as one product check).

## `monitorMode` (type: `boolean`):

When enabled, the actor remembers each store's previous prices and stock status and only outputs changes: `new-product`, `price-change` (with old/new price and % change) and `stock-change` (back-in-stock / out-of-stock). The first run seeds the memory and outputs everything as `baseline`. Ideal for scheduled runs with webhook alerts.

## Actor input object example

```json
{
  "stores": [
    "https://www.allbirds.com",
    "gymshark.com"
  ],
  "maxProductsPerStore": 250,
  "monitorMode": false
}
```

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "stores": [
        "https://www.allbirds.com",
        "gymshark.com"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("vertaizen/shopify-price-monitor").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "stores": [
        "https://www.allbirds.com",
        "gymshark.com",
    ] }

# Run the Actor and wait for it to finish
run = client.actor("vertaizen/shopify-price-monitor").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "stores": [
    "https://www.allbirds.com",
    "gymshark.com"
  ]
}' |
apify call vertaizen/shopify-price-monitor --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=vertaizen/shopify-price-monitor",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

```json
{
    "openapi": "3.0.1",
    "info": {
        "title": "Shopify Price & Stock Monitor — Track Any Store's Products",
        "description": "Track competitor prices, stock & new products in any Shopify store via its public products.json. Monitor mode returns only CHANGES — price drops, out-of-stock, back-in-stock, new launches.",
        "version": "1.0",
        "x-build-id": "3H0BeoRd0br7LaPbV"
    },
    "servers": [
        {
            "url": "https://api.apify.com/v2"
        }
    ],
    "paths": {
        "/acts/vertaizen~shopify-price-monitor/run-sync-get-dataset-items": {
            "post": {
                "operationId": "run-sync-get-dataset-items-vertaizen-shopify-price-monitor",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for its completion, and returns Actor's dataset items in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        },
        "/acts/vertaizen~shopify-price-monitor/runs": {
            "post": {
                "operationId": "runs-sync-vertaizen-shopify-price-monitor",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor and returns information about the initiated run in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/runsResponseSchema"
                                }
                            }
                        }
                    }
                }
            }
        },
        "/acts/vertaizen~shopify-price-monitor/run-sync": {
            "post": {
                "operationId": "run-sync-vertaizen-shopify-price-monitor",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "inputSchema": {
                "type": "object",
                "required": [
                    "stores"
                ],
                "properties": {
                    "stores": {
                        "title": "Shopify stores",
                        "type": "array",
                        "description": "Shopify store URLs or bare domains. Examples: `https://www.allbirds.com`, `gymshark.com`. Any store with a public `/products.json` endpoint works (the vast majority of Shopify stores).",
                        "items": {
                            "type": "string"
                        }
                    },
                    "maxProductsPerStore": {
                        "title": "Max products per store",
                        "minimum": 1,
                        "maximum": 2000,
                        "type": "integer",
                        "description": "Safety cap on the number of products fetched per store (each product may have several variants; every variant row counts as one product check).",
                        "default": 250
                    },
                    "monitorMode": {
                        "title": "Monitor mode — only CHANGES",
                        "type": "boolean",
                        "description": "When enabled, the actor remembers each store's previous prices and stock status and only outputs changes: `new-product`, `price-change` (with old/new price and % change) and `stock-change` (back-in-stock / out-of-stock). The first run seeds the memory and outputs everything as `baseline`. Ideal for scheduled runs with webhook alerts.",
                        "default": false
                    }
                }
            },
            "runsResponseSchema": {
                "type": "object",
                "properties": {
                    "data": {
                        "type": "object",
                        "properties": {
                            "id": {
                                "type": "string"
                            },
                            "actId": {
                                "type": "string"
                            },
                            "userId": {
                                "type": "string"
                            },
                            "startedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "finishedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "status": {
                                "type": "string",
                                "example": "READY"
                            },
                            "meta": {
                                "type": "object",
                                "properties": {
                                    "origin": {
                                        "type": "string",
                                        "example": "API"
                                    },
                                    "userAgent": {
                                        "type": "string"
                                    }
                                }
                            },
                            "stats": {
                                "type": "object",
                                "properties": {
                                    "inputBodyLen": {
                                        "type": "integer",
                                        "example": 2000
                                    },
                                    "rebootCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "restartCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "resurrectCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "computeUnits": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "options": {
                                "type": "object",
                                "properties": {
                                    "build": {
                                        "type": "string",
                                        "example": "latest"
                                    },
                                    "timeoutSecs": {
                                        "type": "integer",
                                        "example": 300
                                    },
                                    "memoryMbytes": {
                                        "type": "integer",
                                        "example": 1024
                                    },
                                    "diskMbytes": {
                                        "type": "integer",
                                        "example": 2048
                                    }
                                }
                            },
                            "buildId": {
                                "type": "string"
                            },
                            "defaultKeyValueStoreId": {
                                "type": "string"
                            },
                            "defaultDatasetId": {
                                "type": "string"
                            },
                            "defaultRequestQueueId": {
                                "type": "string"
                            },
                            "buildNumber": {
                                "type": "string",
                                "example": "1.0.0"
                            },
                            "containerUrl": {
                                "type": "string"
                            },
                            "usage": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "integer",
                                        "example": 1
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "usageTotalUsd": {
                                "type": "number",
                                "example": 0.00005
                            },
                            "usageUsd": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "number",
                                        "example": 0.00005
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}
```