contract__getabi

THE RISK

Low Risk

Why contract__getabi needs a policy

This tool retrieves publicly available metadata (a contract's ABI) from the Etherscan blockchain data API. It performs no writes, deletions, code execution, or financial transactions. ABI data is non-sensitive public information used to understand contract interfaces.

From the tool's definition Tool description states it 'Returns the Contract Application Binary Interface (ABI) of a verified smart contract.' The verb 'Returns' and the nature of ABI retrieval indicate data retrieval with no side effects.

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

POLICY

How to control contract__getabi

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__getabi:

policy.json

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

contract__getabi 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.

CAP THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about contract__getabi

What does the contract__getabi tool do? +

Returns the Contract Application Binary Interface ( ABI ) of a verified smart contract. 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__getabi? +

Register the Etherscan MCP server in PolicyLayer and add a rule for contract__getabi: 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__getabi? +

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

Can I rate-limit contract__getabi? +

Yes. Add a rate_limit block to the contract__getabi 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__getabi completely? +

Set action: deny in the PolicyLayer policy for contract__getabi. 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__getabi? +

contract__getabi 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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