Asin

Asin MCP Server

Official Model Context Protocol server for the Asin Amazon price tracking API.

Track Amazon prices and products with a scheduled watchlist, price history, offers and alerts.

It lets Claude, Cursor, VS Code, Windsurf and any MCP client call the API as tools. Runs over stdio (local) or Streamable HTTP (self-hosted).

Requirements

• Node.js 20 or newer
• a Asin API key — sign up, then copy it from the dashboard

Hosted server (recommended)

Asin runs this server for you at https://www.asin.dev/api/mcp (Streamable HTTP). Send your API key as a Bearer token in the Authorization header; nothing to install.

claude mcp add --transport http asin https://www.asin.dev/api/mcp --header "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "asin": {
      "url": "https://www.asin.dev/api/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

The hosted server and this package expose the same API; run the package locally when you want stdio, your own network egress, or to self-host it.

Run it locally

Claude Code

claude mcp add asin --env ASIN_API_KEY=YOUR_API_KEY -- npx -y @asindev/mcp

Claude Desktop, Cursor, Windsurf and other clients

Add the server to the client's MCP configuration (claude_desktop_config.json, .cursor/mcp.json…):

{
  "mcpServers": {
    "asin": {
      "command": "npx",
      "args": ["-y", "@asindev/mcp"],
      "env": {
        "ASIN_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

VS Code

{
  "servers": {
    "asin": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@asindev/mcp"],
      "env": {
        "ASIN_API_KEY": "${input:asin-api-key}"
      }
    }
  },
  "inputs": [
    {
      "type": "promptString",
      "id": "asin-api-key",
      "description": "Asin API key",
      "password": true
    }
  ]
}

Claude Desktop extension

Download the .mcpb bundle from the releases page and open it; Claude Desktop asks for your API key.

Docker

docker build -t asin-mcp .
docker run -i --rm -e ASIN_API_KEY=YOUR_API_KEY asin-mcp

Tools

Tool	Description
check_product	Asks for a check right away (1 credit), at most once per 5 minutes; earlier calls return the product unchanged. A paused product has to be resumed first. The check runs in the background; with wait=t…
delete_product	Removes the product and its price history.
fetch_offers	Reads the offers on Amazon for 1 credit, refunded if it doesn't answer. A read made in the last 3 hours, by anyone, is returned instead, for free (charged: false). The answer is the same as GET /offe…
get_account	Your plan, the credits left (monthly allowance and packs), how many products you track and the credits they use per month.
get_asin_history	Every price Asin read for an ASIN on a marketplace over the period, whoever tracks it, oldest first, with the lowest, highest and average of those prices. A history of more than 5000 points is thinne…
get_offers	Who sells the product and at what price, as last read, cheapest first, with Amazon's own price and the cheapest new and used offers (used is only known for Amazon's own outlet). Free: this never read…
get_product	The product's latest state and every price read of the period, oldest first. The history covers every read of this ASIN on this marketplace, including those made before you added it, so a product add…
list_products	Your watchlist, newest first, with each product's latest state and its recent prices (trend). Filter with asin (and marketplace) to know if a product is tracked, or with filter to get the same lists…
search_amazon	Amazon search results (up to 60, sponsored included), to find the ASIN of a product. Free, limited to 30 searches per hour.
track_product	Adds an ASIN, an Amazon link or a short link (amzn.to, a.co…) to your watchlist. The first check runs in the background within seconds (checking is true until then): poll GET /products/{id}, or send…
update_product	Target price, drop alerts, check interval, or pause. Send only what changes.

Every tool that calls the API consumes credits. JSON results are returned as text; images are returned inline and other files (PDF…) as embedded resources, up to 4 MB.

Streamable HTTP

npx @asindev/mcp --http --port 3000

The endpoint is POST /mcp (stateless, JSON responses). Each client sends its own key in the x-api-key header (or Authorization: Bearer <key>); the server never uses a key of its own. It binds to 127.0.0.1 by default and rejects browser origins unless you allow them — put it behind TLS before exposing it.

createHttpHandler() is exported for Fetch-compatible runtimes (Cloudflare Workers, Deno, Bun):

import { createHttpHandler } from "@asindev/mcp";

export default { fetch: createHttpHandler({ allowedOrigins: [] }) };

Security

• The API key is read from ASIN_API_KEY (stdio) or the request headers (HTTP) and removed from error messages.
• Content fetched from websites is untrusted: the server instructions tell the model to treat it as data, not instructions.
• See SECURITY.md to report a vulnerability.

Development

npm install
npm test
npm run build
npx @modelcontextprotocol/inspector node dist/stdio.js

Built on the SDK

The server uses the official Node.js SDK (@asindev/sdk).

All Asin SDKs

SDK	Package	Install
Node.js	@asindev/sdk	npm install @asindev/sdk
Python	asindotdev	pip install asindotdev
Go	asin-go	go get github.com/asindotdev/asin-go
.NET	Asin	dotnet add package Asin
Ruby	asindotdev	gem install asindotdev
PHP	asindotdev/sdk	composer require asindotdev/sdk
Java	asin-java	build from source, see its README
CLI	@asindev/cli	npm install -g @asindev/cli
MCP server	@asindev/mcp	npx -y @asindev/mcp

License

MIT — see LICENSE.