Price Monitoring

Given a list of products (ASINs, Walmart URLs, or free-text Google Shopping queries) and an optional baseline file, fetch current prices via ScraperAPI's structured endpoints, compare against the baseline, and produce a structured change report.

You — Claude — execute the API calls using the Bash tool. Do not generate a script for the user to run; fetch the data yourself in this turn and report findings as you go. If the user explicitly asks for a CLI/cron-able script instead, point them at scraperapi-cli and stop.

Auth: All transports authenticate against ScraperAPI. The MCP server reads the key from its own configured environment when the user set it up. The curl fallback reads $SCRAPERAPI_API_KEY from the shell. Do not run a standalone check for the key — just make the first real request. ScraperAPI returns 401 if the key is missing or invalid, and Phase 3's failure-handling table already covers that case. Adding a pre-flight echo only costs the user an extra permission prompt without learning anything you wouldn't learn from the first call.

Phase 1 — Parse the watchlist

Before fetching anything, classify each target. Different inputs route to different ScraperAPI endpoints, and routing wrong wastes credits.