Store Price Tracker in Claude

Questions it answers

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.

Short questions this server answers, each with a direct answer: Track an online store's prices and stock changes.

What it can do

• Lists the products, prices, variants and availability of a Shopify store
• Shows new products, removed products, price changes and stock changes since the previous daily snapshot
• Keeps a daily snapshot of every store it is asked about, so price history builds up
• Reads the price and availability history of one product
• Compares up to five stores in one answer
• Compares store catalogs for price gaps, currency differences, and landed margins

Tools

• check_store_prices, Check a store's products and price changes. Read an online store's products, prices and availability, and what changed since its previous daily snapshot. Use it for questions like "track competitor prices on allbirds.com", "what did gymshark.com change?", "what is new or sold out at this store?". Pass store addresses, up to 5: a bare host such as "allbirds.com", an https link to any page of the store, or a myshopify.com address. Works only for Shopify stores that publish their public product feed (/products.json). Calling it adds the store to a daily snapshot list, so its history builds up. Optional: query (text in a product's title, brand, type or handle), limit. Returns per store a status, the snapshot date, product count, currency, change counts and lists of new, removed, repriced and restocked or sold-out variants, plus matching products. The first snapshot has no changes. Not for one product's history (use get_product_price_history) or for comparing two stores (use compare_store_prices).
• get_product_price_history, Get a product's price history. Read how one product's price and availability moved over the days a store has been tracked. Use it for questions like "how has the price of this hoodie changed?", "when did this product go on sale?", "has this been out of stock?". It is most useful after check_store_prices has tracked the store: history starts on the first snapshot, so a store never read before has one day only. Calling it reads the store when there is no snapshot for today and adds it to the daily snapshot list. Pass the store's address and the product's link, handle or title; an exact handle or title wins over part of a title. Returns per variant the price, the compare-at (was) price and availability on each day something changed. Status ambiguous returns candidates: ask the user to pick one, then call again with that title. Not for a whole store's changes (use check_store_prices) or for comparing stores (use compare_store_prices).
• compare_store_prices, Compare prices and find gaps across stores. Compare product prices between two online stores to find price gaps and margin differences. Use it for questions like "compare prices between allbirds.com and allbirds.co.uk" or "which store sells this item cheaper?". Pass source_store (the benchmark) and target_store addresses. Products are paired by title by default; use match_by "handle" for two regional stores of one brand. Other currencies are converted into the target currency with the latest ECB reference rate unless fx_rate is given. Returns matched pairs with both prices, the gap and percent spread (positive when the target store is dearer), stock, links and the landed gap: the gap left after the shipping and duty allowances per item. Status no_matches means no product paired: try another match_by, a shorter query or a lower min_gap_pct. It adds both stores to the daily snapshot list. Not for one store's changes (use check_store_prices) or one product's history (use get_product_price_history).

Add Store Price Tracker in Claude

Claude connects to a remote MCP server as a custom connector. The connection is made from Anthropic's cloud, not from your laptop, so the server must be on the public internet. Store Price Tracker is. These steps were checked against Claude's custom-connector article (updated 2026-08-11) and the Claude Code MCP docs on 2026-10-01.

On a Pro or Max plan:

1. Open Customize, then Connectors.
2. Select the plus button, then Add custom connector.
3. Paste this URL. Leave Advanced settings empty: this server does not need an OAuth client id or secret.

   https://stores.openkrill.app/mcp

4. Select Add. The connector is yours. Anthropic has not reviewed it, and it is not a Directory listing.
5. In a conversation, open the plus button, then Connectors, and enable Store Price Tracker. Ask: Track competitor prices on allbirds.com

On Team and Enterprise, an Owner adds the connector first at Organization settings, then Connectors, then Add, then Custom, then Web, and pastes the same URL. Members then connect it from Customize. A Free plan can add one custom connector.

In Claude Code, add it from the project directory:

claude mcp add --transport http store-prices https://stores.openkrill.app/mcp

That writes a local or user config. A JSON entry needs "type": "http" (or streamable-http) plus the url. An entry with a url and no type is skipped. Confirm with claude mcp get store-prices. The tools you should see are check_store_prices, get_product_price_history, compare_store_prices.

If Claude tries to fetch https://stores.openkrill.app/mcp from its code sandbox and reports HTTP 403, the block is Claude's sandbox network allowlist, not this server. The sandbox proxy answers 403 with x-deny-reason: host_not_allowed for every host outside the allowlist. Use the connector above instead: connector calls come from Anthropic's cloud and do not pass the sandbox proxy. To let the sandbox reach it as well, an Owner adds stores.openkrill.app under Settings, then Capabilities, then Additional allowed domains.

Enable the connector only in conversations that need it. Claude can call the tools while you work, including during research, so turn off any tool you do not want invoked. Store Price Tracker does not write to your accounts. It still receives the arguments of each call. Read the privacy page before you paste anything that is not public.

If it does not work

A call checked on 2026-10-17

allbirds.com is a public Shopify store used in the plugin's own starter prompts. The request below was posted to https://stores.openkrill.app/mcp as tools/call. HTTP 200. Source: the Store Price Tracker server, read 2026-10-17.

{
  "method": "tools/call",
  "params": {
    "name": "check_store_prices",
    "arguments": {
      "stores": [
        "allbirds.com"
      ],
      "limit": 2
    }
  }
}

• stores. 1 returned
• stores status. stale

Repeat the call yourself if you need a newer reading. Cached answers expire. A rate limit is not a result: wait and try again. Nothing in the call is a ranking, a filing, or advice.

Using it in production

Nothing to install and nothing to run: no package, no Python or Node.js version and no environment variable. Store Price Tracker runs on our servers, and your client only needs the URL https://stores.openkrill.app/mcp.

Use it in other apps

• Store Price Tracker in ChatGPT
• Store Price Tracker in Cursor
• Store Price Tracker in VS Code
• Store Price Tracker in Pi

Roles that use Store Price Tracker

• Shopify operator guide

Frequently asked questions

Words on this page

• MCP (Model Context Protocol) definition
• Streamable HTTP transport definition
• Tool primitive definition
• Rate limit policy definition

Source: plugin listing for store-prices in this repository, and a live tools/call on 2026-10-17. As of 2026-10-17.