Store Price Tracker

Description

From the marketplace listing

Ask what an online store sells, what it charges and what changed since the last time anyone looked. Ask "track competitor prices on allbirds.com", "what did gymshark.com change this week?", "which products on this store are sold out?" or "how has the price of this hoodie moved?". Store Price Tracker reads the public product feed that Shopify stores publish at /products.json, the same list any visitor's browser can fetch without logging in. It reports products, prices, variants and availability, and compares each daily snapshot with the one before it: new products, removed products, price changes and stock changes, per variant. A store you ask about is added to a daily snapshot list, so its price history grows over time and can be read back for any product. It checks the store's robots.txt first, identifies itself with a clear User-Agent, pauses between requests and backs off when a store asks for fewer. When comparing stores across borders quoting in different currencies, it normalizes prices using daily foreign exchange reference rates of the European Central Bank (ECB, https://www.ecb.europa.eu), read through the keyless Frankfurter API (https://frankfurter.dev; URL: https://api.frankfurter.dev/v2/providers/ecb/rates; checked 2026-10-02). Data is reused under the ECB Conditions for Reuse of Public Sector Information with attribution. Stores that are not on Shopify, or that keep their feed private, are reported as unavailable. It stores only public product data (titles, prices, variants, availability) and the store's address. Nothing about you is kept: no prompts, no account and no IP address, only a daily count of calls per tool.