Amazon Price & Review Monitor

Monitors the price, rating and review count of Amazon ASINs. Notifies a webhook when the price drops beyond a threshold, with optional LLM-based sentiment analysis of recent reviews. Like generic page monitoring, designed to be scheduled in a loop — recurring revenue proportional to the number of products and users monitored.

⚠️ Before you publish

Amazon aggressively detects and blocks unproxied requests beyond low volume (CAPTCHA, IP blocking). This actor uses the built-in Apify proxy (proxyConfiguration, enabled by default) — the proxy cost is absorbed into the platform usage paid by the end user of the actor, not by you. Do not disable the proxy in production; the failure rate climbs very fast without it.

Input

Field	Type	Description
asins	array	ASINs to monitor
domain	string	Amazon domain (default: amazon.com)
priceDropThresholdPercent	int	Drop threshold to trigger an alert (default: 5%)
webhookUrl	string	Optional — notified on price drop
analyzeReviewSentiment	bool	Enable LLM sentiment analysis
llmModel	string	OpenRouter model (required if sentiment enabled)
openrouterApiKey	string	Required if sentiment enabled
proxyConfiguration	object	Apify proxy (enabled by default, strongly recommended)

How it works

1. On each run, fetches the product page of every ASIN through the Apify proxy.
2. Compares the current price to the last known price, stored in the actor's default Key-Value Store (persists between scheduled runs).
3. If the drop exceeds the threshold, notifies webhookUrl.
4. If enabled, sends a sample of recent reviews to an LLM for a sentiment summary (positive/neutral/negative + recurring strengths/weaknesses).

Pricing (pay-per-event)

• product-checked — $0.004 — per ASIN checked, on every scheduled run
• price-drop-alert — $0.01 — additionally, if an alert is sent successfully
• review-sentiment-analyzed — $0.008 — additionally, if the sentiment analysis succeeds

Example: 10 products monitored daily (300 checks/month), with sentiment enabled and ~5 price-drop alerts in the month ≈ (300 × $0.004) + (300 × $0.008) + (5 × $0.01) = $1.20 + $2.40 + $0.05 = $3.65/month per user — grows with the number of products and users.

Technical notes

• No GPU required. The proxy and the LLM call are the only two variable costs, both delegated (Apify Proxy, OpenRouter) rather than hosted by you.
• Amazon CSS selectors (#productTitle, .a-price, etc.) can change depending on the A/B layout Amazon tests — plan for occasional maintenance, as with Google Maps and TikTok.
• A fetch failure (CAPTCHA, invalid ASIN) is never charged.