Price Drop Back

Official4 tools

by GoodTurnStudio · JavaScript

Did the price drop after you bought it? Store price-adjustment rules, deadlines and a claim message.

io.github.GoodTurnStudio/pricedropback (MCP Server)

The io.github.GoodTurnStudio/pricedropback MCP server helps determine whether an item’s price dropped after purchase. It stores price-adjustment rules, deadlines, and a claim message to support later price-drop claims.

🛠️ Key Features

Stores price-adjustment rules
Stores deadlines for claims
Stores a claim message

🚀 Use Cases

Track whether the price dropped after purchase
Prepare information needed to submit a price-adjustment claim

⚡ Developer Benefits

Centralizes rule data, timing, and the claim message for downstream workflows

⚠️ Limitations

Documentation provided only describes rule/deadline/claim-message storage; no additional tools or integrations are specified.

Captured live from the server via tools/list.

get_store_policy

A store's price adjustment and price match policy. For requests like "does Target do price matching?", "does John Lewis refund if the price drops?", "Currys price promise", "what's Best Buy's price adjustment policy?", "will Costco refund the difference?". With an item name it adds links to check today's price.

Parameters3

store	string	required	Store name in everyday words, up to 60 characters.
item	string	optional	Optional item name, up to 100 characters, to link today's prices for it.
country	string	optional	Two-letter country code. GB (or UK) gives the UK policy where the store has one (Apple, Amazon, IKEA) and UK rules; it also picks the price links (US, GB and IE get local Amazon and eBay links). Default from the request.

Raw schema

{
  "type": "object",
  "properties": {
    "store": {
      "type": "string",
      "description": "Store name in everyday words, up to 60 characters."
    },
    "item": {
      "type": "string",
      "description": "Optional item name, up to 100 characters, to link today's prices for it."
    },
    "country": {
      "type": "string",
      "description": "Two-letter country code. GB (or UK) gives the UK policy where the store has one (Apple, Amazon, IKEA) and UK rules; it also picks the price links (US, GB and IE get local Amazon and eBay links). Default from the request."
    }
  },
  "required": [
    "store"
  ],
  "additionalProperties": false
}

check_price_drop_claim

Can I get the difference back? For requests like "I bought a TV at Best Buy 9 days ago for $499 and it's $449 now, can I get the difference?". Says whether a claim is likely (likely, likely_if_member, unlikely, check or no_drop), the amount, and the steps. With an item name it adds a Cheapest Price link and Amazon and eBay links to check today's price. Likely claims also get claim_message, ready to paste into the store's chat or email. policy.refund_paid_as flags stores that pay store credit (Newegg)

Parameters7

store	string	required	Store name, up to 60 characters.
days_since_purchase	integer	optional	Days since you bought it (or since delivery), 0 to 400. Give this or purchase_date.
purchase_date	string	optional	The date you bought it, YYYY-MM-DD, instead of days_since_purchase. Adds deadlines: the last day to claim with the store (and in a members' longer window) and Capital One card protection.
paid	number	optional	What you paid, 0 to 100000 (US dollars, or pounds for UK stores).
now	number	optional	Today's price, 0 to 100000 (US dollars, or pounds for UK stores).
item	string	optional	Optional item name, up to 100 characters, to link today's price on Cheapest Price, Amazon and eBay.
country	string	optional	Two-letter country code. GB (or UK) gives the UK policy where the store has one (Apple, Amazon, IKEA) and UK rules; it also picks the price links (US, GB and IE get local Amazon and eBay links). Default from the request.

Raw schema

{
  "type": "object",
  "properties": {
    "store": {
      "type": "string",
      "description": "Store name, up to 60 characters."
    },
    "days_since_purchase": {
      "type": "integer",
      "description": "Days since you bought it (or since delivery), 0 to 400. Give this or purchase_date."
    },
    "purchase_date": {
      "type": "string",
      "format": "date",
      "description": "The date you bought it, YYYY-MM-DD, instead of days_since_purchase. Adds deadlines: the last day to claim with the store (and in a members' longer window) and Capital One card protection."
    },
    "paid": {
      "type": "number",
      "description": "What you paid, 0 to 100000 (US dollars, or pounds for UK stores)."
    },
    "now": {
      "type": "number",
      "description": "Today's price, 0 to 100000 (US dollars, or pounds for UK stores)."
    },
    "item": {
      "type": "string",
      "description": "Optional item name, up to 100 characters, to link today's price on Cheapest Price, Amazon and eBay."
    },
    "country": {
      "type": "string",
      "description": "Two-letter country code. GB (or UK) gives the UK policy where the store has one (Apple, Amazon, IKEA) and UK rules; it also picks the price links (US, GB and IE get local Amazon and eBay links). Default from the request."
    }
  },
  "required": [
    "store"
  ],
  "additionalProperties": false
}

get_claim_reminder

Calendar reminder for the last day to claim a price drop. Returns a calendar file (.ics) with an all-day event on the store's last claim day, how to claim and the policy link, with alerts 3 days before and on the day. Nothing is stored. check_price_drop_claim gives this link as add_to_calendar when purchase_date is given and a claim is likely.

Parameters5

store	string	required	Store name.
purchase_date	string	required	The date you bought it, YYYY-MM-DD.
member	boolean	optional	Set to true to use the longer members' window where the store has one (for example My Best Buy Plus or Total).
item	string	optional	Optional item name for the event title, up to 100 characters.
country	string	optional	Two-letter country code. GB (or UK) uses the UK policy where the store has one. Default from the request.

Raw schema

{
  "type": "object",
  "properties": {
    "store": {
      "type": "string",
      "description": "Store name."
    },
    "purchase_date": {
      "type": "string",
      "format": "date",
      "description": "The date you bought it, YYYY-MM-DD."
    },
    "member": {
      "type": "boolean",
      "description": "Set to true to use the longer members' window where the store has one (for example My Best Buy Plus or Total)."
    },
    "item": {
      "type": "string",
      "description": "Optional item name for the event title, up to 100 characters."
    },
    "country": {
      "type": "string",
      "description": "Two-letter country code. GB (or UK) uses the UK policy where the store has one. Default from the request."
    }
  },
  "required": [
    "store",
    "purchase_date"
  ],
  "additionalProperties": false
}

list_stores

Every store covered, plus card price protection. For requests like "which stores give you money back if the price drops?" or "does my credit card have price protection?". With country=GB, lists the UK policies.

Parameters1

country

string

optional

Two-letter country code. GB (or UK) lists only stores with a UK policy. Default from the request.

Raw schema

{
  "type": "object",
  "properties": {
    "country": {
      "type": "string",
      "description": "Two-letter country code. GB (or UK) lists only stores with a UK policy. Default from the request."
    }
  },
  "required": [],
  "additionalProperties": false
}

README.md4 KBView on GitHub

goodturn-mcp

Remote MCP servers for 25 free, read-only everyday helpers by Good Turn Studio: money, health, jobs, travel, shopping, halal checks, football and scripture reading. One Cloudflare Worker turns each product's public OpenAPI spec into an MCP server, so any assistant that speaks MCP (Claude, ChatGPT, Alexa+, Cursor, VS Code and others) can use them.

One server per product: https://goodturn-mcp.pages.dev/<slug>/mcp
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Every tool is read-only, with a title and annotations (readOnlyHint: true, destructiveHint: false, idempotentHint: true)
Nothing about the user is stored. Privacy: https://goodturn-mcp.pages.dev/privacy

Products

Product	Slug	What it does
Mizan	`mizan`	Shariah screening of US stocks under four standards, halal alternatives, purification, zakat
Halal or Not	`halalornot`	Halal checks for food, ingredients, medicines, stocks, funds and crypto
Fare Deals	`faredeals`	Cheap flights from any city, and the cheapest days to fly
Cheapest Price	`cheapestprice`	The lowest current price for a product, checked live
Spin My Day	`spinmyday`	A whole day out in any city, matched to weather, mood and diet
Cancel My Sub	`cancelmysub`	How to cancel US and UK subscriptions, and what a card charge is
Lower My Bill	`lowermybill`	Call scripts and low-cost plans to lower household bills
Price Drop Back	`pricedropback`	Store price-adjustment rules, deadlines and a claim message
Find My Money	`findmymoney`	Official unclaimed money searches in the US and UK
Supplement Check	`supplementcheck`	Supplement labels and doses against official upper limits
Plate Pal	`platepal`	Calories and nutrition for foods, chain meals and barcodes
Plan My Workout	`planmyworkout`	Workout plans and how to do any exercise
Med Bill Check	`medbillcheck`	US medical bills against Medicare rates, with dispute letters
Appeal My Claim	`appealmyclaim`	US health insurance denials, rights, deadlines and appeal letters
Job Spotter	`jobspotter`	Current US and UK job listings
Sync My Cycle	`syncmycycle`	Likely cycle phase today, with food and workout ideas
Wardrobe Connect	`wardrobeconnect`	Clothes that match a description or a picture
Form Guide	`formguide`	Football form, fixtures, results and tables
Books Like This	`bookslikethis`	Books like one you enjoyed, and screen adaptations
Talmud Scroller	`talmud`	Daily Talmud with Daf Yomi, and tractates in English
Scroll the Gurbani	`gurbani`	Daily Gurbani with English, any Ang or shabad
Gita Scroller	`gita`	Daily Bhagavad Gita verses with English
Scroll the Lore	`lore`	Greek and Norse myth, Homer, Hesiod and the Poetic Edda
Stoic Scroller	`stoics`	Marcus Aurelius, Epictetus and Seneca
Bible Swipe	`bible`	Daily Bible readings and any passage

How it works

build.py reads each product's live openapi.json and writes products.js: one tool per GET operation, named from its operationId, with inputs from its parameters. Descriptions are tidied into plain tool descriptions.
worker.mjs is the MCP server: initialize, tools/list and tools/call, which calls the product's own API and returns its answer. Answers with a say field carry a ready-made summary.
servers.json lists every server for the official MCP Registry (as io.github.GoodTurnStudio/<slug>). The Publish to the MCP Registry workflow logs in with GitHub OIDC and runs publish.py; publish.ps1 does the same from Windows.

Build and test

code

npm install
npm run build          # python3 build.py, then bundle to deploy/_worker.js
npm test               # every product through the worker, against the live APIs
npm run test:live      # every tool through the deployed servers with the MCP SDK client

Deploy deploy/ as a Cloudflare Pages project in advanced mode (_worker.js).

Licence

MIT for this code. Each product's API, data and answers belong to that product and are served under its own terms, linked from its page at https://goodturn-mcp.pages.dev/<slug>.

Install

Tools (4)

get_store_policycheck_price_drop_claimget_claim_reminderlist_stores

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://goodturn-mcp.pages.dev/pricedropback/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "pricedropback": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://goodturn-mcp.pages.dev/pricedropback/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.

io.github.GoodTurnStudio/pricedropback (MCP Server)

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

get_store_policy

check_price_drop_claim

get_claim_reminder

list_stores

goodturn-mcp

Products

How it works

Build and test

Licence

Install

Remote endpoint

Related servers