Contract Guard MCP README
The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Contract Guard MCP listing page.
contract-guard-mcp
MCP server for a pre-interaction risk check on any EVM contract/token — what an agent needs before it approves, swaps, or trusts an address.
Tool: check_contract(address, chain="base") →
- is-contract vs EOA / self-destructed
- EIP-7702 delegated-EOA detection
- upgradeable proxy detection (EIP-1967 + legacy zeppelinos)
- ERC20 metadata (name / symbol / decimals / totalSupply)
- risk score + actionable flags
Chains: Base, Ethereum. Pure public JSON-RPC, zero dependencies, no signing.
Also available as a pay-per-call x402 HTTP endpoint:
https://eltociear-contract-guard.hf.space (POST /check, $0.005 USDC on Base).
Run
MIT licensed.
Tools
check_contract(address, chain)— is-contract/EOA, EIP-7702, proxy, ERC20 metadata, risk scorecheck_approval(token, owner, spender, chain)— ERC20 allowance audit; flags unlimited approvals (the #1 drain vector)
Free MCP vs paid x402
This MCP server is free (run it locally / via your client). For server-side, batch, or no-install use, the same engine is a pay-per-call x402 HTTP API — POST https://eltociear-contract-guard.hf.space/check ($0.005 USDC on Base, no signup). Your agent's wallet pays per call.
Professional audit services
Maintained by the same author — paid services on Polar (Stripe checkout):
- MCP Security Audit Report — $5 — one-off audit of your MCP server: 68 attack patterns, severity-rated PDF report with concrete fixes.
- Security Pulse — $5/mo (annual $50) — monthly briefing on newly disclosed MCP server vulnerabilities, scan stats across 100+ tracked repos, mitigation playbooks.
- Pro Audit Stack — $20/mo — for teams running MCP servers in CI/CD: 50 hosted scans/month, Discord access, 24h SLA on vulnerability questions.
Full catalog: polar.sh/eltociear
Also live: clean-read ($0.005 / call)
Same operator, same x402 rails: clean-read turns any URL into clean Markdown for AI agents — fetches the page, strips nav/ads/boilerplate (trafilatura), returns the main content with title and word count. POST https://eltociear-skill-audit.hf.space/read — $0.005 USDC on Base, no signup.