# Amazon Price and Stock Change Monitor Alerts (`redfoxxie/amazon-price-stock-change-monitor`) Actor Monitor public Amazon product pages and emit only detected price or availability changes across scheduled runs, with persistent baselines, bounded inputs, free previews, and explicit source diagnostics. - **URL**: https://apify.com/redfoxxie/amazon-price-stock-change-monitor.md - **Developed by:** [João Ferreira](https://apify.com/redfoxxie) (community) - **Categories:** E-commerce, Automation, Developer tools - **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks - **User rating**: No ratings yet ## Pricing $5.00 / 1,000 amazon 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 web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows. 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 This independent product is not affiliated with, sponsored by, or endorsed by Amazon. ### Amazon price and availability changes, not repeated snapshots Amazon Price and Stock Change Monitor Alerts watches a bounded list of public Amazon product pages and emits records only when a tracked price or availability value differs from the previous successful baseline. It is designed for competitor monitoring, purchasing alerts, reseller operations, catalog research, and automation workflows that need changes rather than a complete product scrape every time. Provide up to 20 HTTPS Amazon product URLs containing valid ASINs. The Actor fetches each public page, extracts its title, visible price, availability text, and stock interpretation, then compares those values with state retained under the selected `monitorId`. Separate monitor IDs maintain independent watchlists. A source-status summary shows which pages succeeded and which failed. ### Baselines and billing safety `previewOnly=true` is the default. Preview mode verifies current source access and returns diagnostics without charging custom events or changing persistent state. On the first non-preview run, the Actor creates the baseline without describing the existing values as changes. Later runs emit only genuine differences. This prevents a fresh watchlist from billing every product immediately. The Actor uses limited-permission named key-value storage for its baseline. State is bounded, inputs are capped, requests use timeouts, and Amazon verification pages cause explicit source failures rather than misleading empty output. If every page fails, the run fails visibly. Partial failures preserve successful observations and are disclosed in the summary. ### Output Change records contain ASIN, title, current and previous price, current and previous availability, changed fields, product URL, and observation time. The `changes` dataset view is arranged for webhooks, spreadsheets, alerting systems, and downstream price-history stores. ### Pricing Pricing is **Pay per event + usage** with **no start fee**. A delivered change uses event `amazon_price_stock_change` at **$0.005**. Unchanged products do not emit paid events. Apify platform usage is charged separately to the runner under normal compute and storage rules. Free preview mode emits no paid event. Public retail pages can change structure or challenge automated access. This Actor detects common verification responses, exposes source health, and avoids claiming observations it could not parse. Users are responsible for lawful usage, appropriate schedules, and compliance with applicable terms and policies. # Actor input Schema ## `productUrls` (type: `array`): HTTPS Amazon product pages containing a valid ASIN. ## `maxAlerts` (type: `integer`): Maximum paid change records emitted in one run. ## `monitorId` (type: `string`): Stable identifier for independent persistent baselines. ## `previewOnly` (type: `boolean`): Fetch snapshots without charging or mutating state. ## Actor input object example ```json { "productUrls": [ "https://www.amazon.com/dp/B0D1XD1ZV3" ], "maxAlerts": 50, "monitorId": "airpods-prices", "previewOnly": true } ```` # Actor output Schema ## `changes` (type: `string`): No description # API You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup. ## JavaScript example ```javascript import { ApifyClient } from 'apify-client'; // Initialize the ApifyClient with your Apify API token // Replace the '' with your token const client = new ApifyClient({ token: '', }); // Prepare Actor input const input = {}; // Run the Actor and wait for it to finish const run = await client.actor("redfoxxie/amazon-price-stock-change-monitor").call(input); // Fetch and print Actor results from the run's dataset (if any) console.log('Results from dataset'); console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${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 '' with your token. client = ApifyClient("") # Prepare the Actor input run_input = {} # Run the Actor and wait for it to finish run = client.actor("redfoxxie/amazon-price-stock-change-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 '{}' | apify call redfoxxie/amazon-price-stock-change-monitor --silent --output-dataset ``` ## MCP server setup ```json { "mcpServers": { "apify": { "command": "npx", "args": [ "mcp-remote", "https://mcp.apify.com/?tools=redfoxxie/amazon-price-stock-change-monitor", "--header", "Authorization: Bearer " ] } } } ``` ## OpenAPI specification ```json { "openapi": "3.0.1", "info": { "title": "Amazon Price and Stock Change Monitor Alerts", "description": "Monitor public Amazon product pages and emit only detected price or availability changes across scheduled runs, with persistent baselines, bounded inputs, free previews, and explicit source diagnostics.", "version": "0.1", "x-build-id": "lnBl6vEhebEjWLbFh" }, "servers": [ { "url": "https://api.apify.com/v2" } ], "paths": { "/acts/redfoxxie~amazon-price-stock-change-monitor/run-sync-get-dataset-items": { "post": { "operationId": "run-sync-get-dataset-items-redfoxxie-amazon-price-stock-change-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": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK" } } } }, "/acts/redfoxxie~amazon-price-stock-change-monitor/runs": { "post": { "operationId": "runs-sync-redfoxxie-amazon-price-stock-change-monitor", "x-openai-isConsequential": false, "summary": "Executes an Actor and returns information about the initiated run in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$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": { "$ref": "#/components/schemas/runsResponseSchema" } } } } } } }, "/acts/redfoxxie~amazon-price-stock-change-monitor/run-sync": { "post": { "operationId": "run-sync-redfoxxie-amazon-price-stock-change-monitor", "x-openai-isConsequential": false, "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$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": [ "productUrls" ], "properties": { "productUrls": { "title": "Amazon product URLs", "minItems": 1, "maxItems": 20, "type": "array", "description": "HTTPS Amazon product pages containing a valid ASIN.", "items": { "type": "string", "maxLength": 1000 }, "default": [ "https://www.amazon.com/dp/B0D1XD1ZV3" ] }, "maxAlerts": { "title": "Maximum change alerts", "minimum": 1, "maximum": 200, "type": "integer", "description": "Maximum paid change records emitted in one run.", "default": 50 }, "monitorId": { "title": "Monitor state ID", "maxLength": 60, "type": "string", "description": "Stable identifier for independent persistent baselines.", "default": "default" }, "previewOnly": { "title": "Free preview", "type": "boolean", "description": "Fetch snapshots without charging or mutating state.", "default": true } } }, "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 } } } } } } } } } } ```