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Scans Base L2 smart contracts for security risks. Risk score 0-100, detects backdoors & proxies.
About
Scans Base L2 smart contracts for security risks. Risk score 0-100, detects backdoors & proxies.
Security Report
7.2
Moderate7.2Low RiskValid MCP server (2 strong, 4 medium validity signals). 3 known CVEs in dependencies (0 critical, 2 high severity) ⚠️ Package registry links to a different repository than scanned source. Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
4 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
BaseScan API key for source code analysis (optional — basic bytecode scan works without it)Required
Environment variable: BASESCAN_API_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-fino-oss-contract-scanner": {
"env": {
"BASESCAN_API_KEY": "your-basescan-api-key-here"
},
"args": [
"-y",
"contract-scanner-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
Contract Security Scanner — MCP Server
Scan any Base L2 smart contract for security risks directly from your AI assistant.
3 tools exposed:
scan_contract— Full security scan (source verification, risky selectors, age, activity)batch_scan— Compare up to 5 contracts side by sideinterpret_risk— Get an actionable recommendation (SAFE / CAUTION / HIGH_RISK / DO_NOT_USE)
Risk score: 0-100. Analyzes: mint/blacklist/backdoor functions, proxy patterns, source verification, contract age, transaction activity.
Installation
Claude Desktop
Add to ~/Library/Application Support/Claude/claude_desktop_config.json:
{
"mcpServers": {
"contract-scanner": {
"command": "node",
"args": ["/Users/sam/Desktop/samDev/p8/mcp/server.js"]
}
}
}
Restart Claude Desktop. The tools appear automatically.
Cursor
Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):
{
"mcpServers": {
"contract-scanner": {
"command": "node",
"args": ["/Users/sam/Desktop/samDev/p8/mcp/server.js"]
}
}
}
Cline (VS Code extension)
- Open Cline settings → MCP Servers → Add server
- Set type:
stdio - Command:
node /Users/sam/Desktop/samDev/p8/mcp/server.js
Any MCP client (generic)
The server uses stdio transport — just pipe JSON-RPC messages:
node /Users/sam/Desktop/samDev/p8/mcp/server.js
Usage examples
Once connected, just ask your AI assistant naturally:
"Scan this contract before I approve: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
"Compare the risk of these 3 Aave clones: 0x... 0x... 0x..."
"Is this token safe to buy? 0x4ed4e862860bed51a9570b96d89af5e1b0efefed"
What gets analyzed
| Check | Source |
|---|---|
| Source code verified? | BaseScan API |
| Mint / burn functions | Bytecode selector scan |
| Pause / freeze | Bytecode selector scan |
| Blacklist / whitelist | Bytecode selector scan |
| Backdoors (rescueTokens, withdrawAll) | Bytecode selector scan |
| Upgradeable proxy | BaseScan + delegatecall detection |
| Contract age | BaseScan transaction history |
| Activity level | BaseScan recent txs |
Risk scoring
| Score | Label | Meaning |
|---|---|---|
| 0-9 | SAFE | No red flags |
| 10-29 | LOW | Minor concerns |
| 30-49 | MEDIUM | Elevated risk — review before interacting |
| 50-69 | HIGH | Significant risk — small amounts only |
| 70+ | CRITICAL | Avoid — potential rug or backdoor |
Technical notes
- Chain: Base L2 only (
https://mainnet.base.org) - API: BaseScan free tier (no key needed for basic checks; set
BASESCAN_API_KEYenv var for full source analysis) - No wallet needed: read-only RPC calls only
- Latency: ~2-5s per contract (network dependent)
Built on Base. Agent wallet: 0x804dd2cE4aA3296831c880139040e4326df13c6e
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