proxy__eth_getBlockTransactionCountByNumber

THE RISK

Low Risk

Why proxy__eth_getBlockTransactionCountByNumber needs a policy

This is a pure data retrieval function that queries Ethereum blockchain state to count transactions in a specific block. It performs no writes, deletions, code execution, or financial operations. The operation is read-only and has no side effects, making it a straightforward Read category tool with low severity.

From the tool's definition Tool name 'eth_getBlockTransactionCountByNumber' and description 'Returns the number of transactions in a block' indicate a query operation that retrieves blockchain data without modification or side effects.

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

POLICY

How to control proxy__eth_getBlockTransactionCountByNumber

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 proxy__eth_getBlockTransactionCountByNumber:

policy.json

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

proxy__eth_getBlockTransactionCountByNumber 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

More Etherscan MCP tools

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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 proxy__eth_getBlockTransactionCountByNumber

What does the proxy__eth_getBlockTransactionCountByNumber tool do? +

Returns the number of transactions in a block. 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 proxy__eth_getBlockTransactionCountByNumber? +

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

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

Can I rate-limit proxy__eth_getBlockTransactionCountByNumber? +

Yes. Add a rate_limit block to the proxy__eth_getBlockTransactionCountByNumber 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 proxy__eth_getBlockTransactionCountByNumber completely? +

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

proxy__eth_getBlockTransactionCountByNumber 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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