Name: MCP Smart Contract Analyst
Author: RockYuan

LABSCO SUMMARY

The unverified case is the reason to use it.

Reading a verified contract is easy enough anywhere; the value here is that an address with no published source still produces something to read, because the server falls back to decompilation. Treat recovered source as a lead rather than ground truth — it is reconstructed, not the original — and keep the analysis as one input into a review rather than the review itself.

What it is

A Node MCP server that interacts with the Monad blockchain to retrieve smart contract source code and analyse it for functionality and security.

What you get

Contract source fetched by address from the configured BlockVision endpoint
A decompilation fallback for unverified contracts, so an address without published source is still reviewable
Analysis covering both what the contract does and where it is risky, rather than only a listing
Setup paths for both Cursor and Claude Desktop, with the same environment block

Requirements

Node.js v16 or later, npm install and npm run build. Three environment variables in the client: API_URL for the contract source endpoint, API_KEY for it, and DECOMPILE_URL for the decompiler used on unverified contracts.

Setup effort

Build from source — git clone https://github.com/rockyuan/mcp-contract-analyst.git

See installation options

USE CASES

01

Vetting a contract before interacting with it

Hand over the address and ask what the contract does and where its risks are.

02

Reading an unverified contract

Let the decompilation fallback recover source, then review the reconstructed logic.

03

Comparing two deployments

Fetch both addresses and ask which behaviours differ.

BEFORE YOU INSTALL

What to know first

Requires

Node.js
API_KEY in your environment

Where it runs

Both documented clients run the server on your machine.

INSTALLATION

Connect your client

You clone and build this one yourself.

Server setup

TERMINAL

git clone https://github.com/rockyuan/mcp-contract-analyst.git
cd mcp-contract-analyst
npm install
npm run build

MCP Clients

Cursor, Claude Desktop

JSON

{
  "mcpServers": {
    "mcp-contract-analyst": {
      "command": "node",
      "args": [
        "/<YOUR_PATH_TO_PROJECT>/build/index.js"
      ],
      "env": {
        "API_URL": "https://api.blockvision.org/v2/monad/contract/source/code?address=",
        "API_KEY": "<YOUR_API_KEY>",
        "DECOMPILE_URL": "https://www.ethervm.io/decompile"
      }
    }
  }
}

MCP Smart Contract Analyst