contract__checkverifystatus

THE RISK

Low Risk

Why contract__checkverifystatus needs a policy

This tool queries blockchain data to retrieve the status of a contract verification request. It performs no modifications, deletions, executions, or financial operations. It is a straightforward read operation consistent with the other account and contract query tools on the Etherscan MCP server. The low severity reflects minimal blast radius — retrieving verification status cannot harm data or systems.

From the tool's definition Tool description states it 'Returns the success or error status of a contract verification request' — a pure retrieval operation with no side effects. The verb 'Returns' and the context of checking status indicate a query operation.

Documented attack patterns abuse exactly the kind of access contract__checkverifystatus gives an agent:

POLICY

How to control contract__checkverifystatus

PolicyLayer is an MCP gateway — it sits between your AI agents and Etherscan MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for contract__checkverifystatus:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "contract__checkverifystatus": {}
  }
}

contract__checkverifystatus is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Etherscan MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about contract__checkverifystatus

What does the contract__checkverifystatus tool do? +

Returns the success or error status of a contract verification request. It is categorised as a Read tool in the Etherscan MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on contract__checkverifystatus? +

Register the Etherscan MCP server in PolicyLayer and add a rule for contract__checkverifystatus: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Etherscan MCP. Nothing to install.

What risk level is contract__checkverifystatus? +

contract__checkverifystatus is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit contract__checkverifystatus? +

Yes. Add a rate_limit block to the contract__checkverifystatus rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block contract__checkverifystatus completely? +

Set action: deny in the PolicyLayer policy for contract__checkverifystatus. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides contract__checkverifystatus? +

contract__checkverifystatus is provided by the Etherscan MCP server (xiaok/etherscan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Etherscan MCP tool call.

Start from Etherscan MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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