# Price & Stock Monitor — Track Product Price Changes (Vigia) (`om_kh/vigia-price-stock-delta`) Actor Monitor product prices & stock from public pages. Get only changes — price up/down with %, back-in-stock, out-of-stock. Pay only for what changes. - **URL**: https://apify.com/om\_kh/vigia-price-stock-delta.md - **Developed by:** [omar khandji](https://apify.com/om_kh) (community) - **Categories:** E-commerce, Business - **Stats:** 2 total users, 0 monthly users, 50.0% runs succeeded, 0 bookmarks - **User rating**: No ratings yet ## Pricing $7.00 / 1,000 price or stock changes 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/docs.md): ```bash npm install apify-client ``` In Python projects, use official [Python client library](https://docs.apify.com/api/client/python/docs.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/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 ## Vigia Price & Stock Delta **Monitor product prices and stock — pay only for what changes.** Point Vigia at public product pages, or give it a Shopify store URL to track its entire catalog, and get only meaningful changes: price up/down (with percent), back-in-stock and out-of-stock. It reads the structured product data (schema.org JSON-LD) shops publish publicly, and Shopify's public `/products.json` catalog feed. ### Why choose Vigia - **Only changes, only charged for changes, at $0.007** — new products, price up/down, back-in-stock and out-of-stock. Removed and out-of-stock are delivered free. Most trackers bill you every run or every product checked, even when nothing moved — so the real amount you pay is usually higher than their sticker price. - **Whole-catalog Shopify coverage** — give it a store URL and Vigia reads every product and variant from the store's public catalog feed, no anti-bot fragility. - **Amazon Best Sellers Rank tracking** — give it ASINs and get price, stock, *and* BSR moves (`bsr_improved`/`bsr_declined`) — fetched via a chained, licensed Amazon actor, never scraped directly. - **"Lowest price ever" intelligence** — in monitor mode Vigia remembers each product's price history and flags `at_lowest_ever`, `pct_from_lowest` and `pct_from_average`. Know a drop is a *real* all-time low, not noise. - **Move magnitude** — every price change is tagged `minor` / `moderate` / `major` so you can filter the signal from the noise. - **Aggregate price signal** — each run returns a `price_signal`: how many up/down, average drop %, biggest mover, total value shift. The story, not just rows. - **Percent price moves** — every price change includes `previous_price`, `price_change` and `price_change_pct`. - **Delta monitoring** — turn on monitor mode; later runs return only what changed since the last run. - **Fair pricing** — hard `maxTotalChargeUsd` cap; never billed without a result. - **Clean output** — structured JSON/CSV for your CRM, n8n or Make. ### Input - `productUrls` — public product page URLs, e.g. `["https://shop.example/products/widget"]` - `shopifyStores` — Shopify store domains, e.g. `["https://shop.example"]`, to track the whole catalog - `amazonAsins` — Amazon ASINs to track, e.g. `["B01ABCDEF2"]` - `monitorEnabled` — first run stores a free baseline; later runs deliver only changes. - `monitorId` — optional name to keep separate targets independent. - `maxTotalChargeUsd` — hard spend cap for the run. You can also pass your own `currentProducts` / `previousProducts` arrays if you bring your own data. ### Output One row per change: `change_type` (new / price_up / price_down / back_in_stock / out_of_stock / removed), `name`, `price`, `previous_price`, `price_change_pct`, `magnitude`, `at_lowest_ever`, `pct_from_lowest`, `pct_from_average`, `in_stock`, `currency`, `source_url`. Plus a `RUN_SUMMARY.json` with the aggregate `price_signal`. ### Notes - Reads only publicly published structured data. Respects a 1 MB page limit and blocks redirects. - Price/stock changes are charged after delivery; removed and out-of-stock are free. # Actor input Schema ## `productUrls` (type: `array`): Public product page URLs to read. Vigia reads only the JSON-LD product data the page publishes. ## `shopifyStores` (type: `array`): Shopify store domains (e.g. https://shop.example). Vigia reads every product/variant from the store's public products.json — no anti-bot, whole catalog. ## `amazonAsins` (type: `array`): Amazon product ASINs to track (price, stock and Best Sellers Rank). Fetched via a chained, licensed Amazon actor — never scraped directly. ## `previousProducts` (type: `array`): Products from the prior run; used to return only what changed. ## `currentProducts` (type: `array`): Products you supply directly (product_id, name, price, in_stock). ## `monitorEnabled` (type: `boolean`): The first monitored run stores a free baseline. Later runs deliver and charge only changes. ## `monitorId` (type: `string`): Pins the persistent baseline to a name of your choice. Leave empty to derive it automatically. ## `maxTotalChargeUsd` (type: `number`): Hard maximum amount that this run may charge. ## `sources` (type: `array`): Declare every upstream source before this run. ## Actor input object example ```json { "productUrls": [], "shopifyStores": [], "amazonAsins": [], "previousProducts": [], "currentProducts": [ { "product_id": "SKU-1", "name": "Example Product", "price": 19.99, "currency": "USD", "in_stock": true } ], "monitorEnabled": false, "monitorId": "", "maxTotalChargeUsd": 1, "sources": [ { "name": "Public product page", "authorization": "public_structured_data", "estimated_cost_usd": 0 }, { "name": "Amazon product data (via ryanclinton/amazon-product-scraper)", "authorization": "public_search_results", "estimated_cost_usd": 0.004 } ] } ```` # 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 '' with your token const client = new ApifyClient({ token: '', }); // Prepare Actor input const input = {}; // Run the Actor and wait for it to finish const run = await client.actor("om_kh/vigia-price-stock-delta").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 '' with your token. client = ApifyClient("") # Prepare the Actor input run_input = {} # Run the Actor and wait for it to finish run = client.actor("om_kh/vigia-price-stock-delta").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 '{}' | apify call om_kh/vigia-price-stock-delta --silent --output-dataset ``` ## MCP server setup ```json { "mcpServers": { "apify": { "command": "npx", "args": [ "mcp-remote", "https://mcp.apify.com/?tools=om_kh/vigia-price-stock-delta", "--header", "Authorization: Bearer " ] } } } ``` ## OpenAPI specification ```json { "openapi": "3.0.1", "info": { "title": "Price & Stock Monitor — Track Product Price Changes (Vigia)", "description": "Monitor product prices & stock from public pages. Get only changes — price up/down with %, back-in-stock, out-of-stock. Pay only for what changes.", "version": "0.1", "x-build-id": "onG4QYYzLMMa2633i" }, "servers": [ { "url": "https://api.apify.com/v2" } ], "paths": { "/acts/om_kh~vigia-price-stock-delta/run-sync-get-dataset-items": { "post": { "operationId": "run-sync-get-dataset-items-om_kh-vigia-price-stock-delta", "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": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK" } } } }, "/acts/om_kh~vigia-price-stock-delta/runs": { "post": { "operationId": "runs-sync-om_kh-vigia-price-stock-delta", "x-openai-isConsequential": false, "summary": "Executes an Actor and returns information about the initiated run in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$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": { "$ref": "#/components/schemas/runsResponseSchema" } } } } } } }, "/acts/om_kh~vigia-price-stock-delta/run-sync": { "post": { "operationId": "run-sync-om_kh-vigia-price-stock-delta", "x-openai-isConsequential": false, "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$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": [ "maxTotalChargeUsd" ], "properties": { "productUrls": { "title": "Product page URLs", "type": "array", "description": "Public product page URLs to read. Vigia reads only the JSON-LD product data the page publishes.", "default": [], "items": { "type": "string" } }, "shopifyStores": { "title": "Shopify store URLs", "type": "array", "description": "Shopify store domains (e.g. https://shop.example). Vigia reads every product/variant from the store's public products.json — no anti-bot, whole catalog.", "default": [], "items": { "type": "string" } }, "amazonAsins": { "title": "Amazon ASINs", "type": "array", "description": "Amazon product ASINs to track (price, stock and Best Sellers Rank). Fetched via a chained, licensed Amazon actor — never scraped directly.", "default": [], "items": { "type": "string" } }, "previousProducts": { "title": "Previous products", "type": "array", "description": "Products from the prior run; used to return only what changed.", "default": [] }, "currentProducts": { "title": "Current products", "type": "array", "description": "Products you supply directly (product_id, name, price, in_stock).", "default": [ { "product_id": "SKU-1", "name": "Example Product", "price": 19.99, "currency": "USD", "in_stock": true } ] }, "monitorEnabled": { "title": "Monitor only new changes", "type": "boolean", "description": "The first monitored run stores a free baseline. Later runs deliver and charge only changes.", "default": false }, "monitorId": { "title": "Monitor ID (optional)", "type": "string", "description": "Pins the persistent baseline to a name of your choice. Leave empty to derive it automatically.", "default": "" }, "maxTotalChargeUsd": { "title": "Maximum Vigia charge (USD)", "minimum": 0, "type": "number", "description": "Hard maximum amount that this run may charge.", "default": 1 }, "sources": { "title": "Declared upstream sources and estimated costs", "type": "array", "description": "Declare every upstream source before this run.", "default": [ { "name": "Public product page", "authorization": "public_structured_data", "estimated_cost_usd": 0 }, { "name": "Amazon product data (via ryanclinton/amazon-product-scraper)", "authorization": "public_search_results", "estimated_cost_usd": 0.004 } ] } } }, "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 } } } } } } } } } } ```