estimateGasCost

THE RISK

Low Risk

Why estimateGasCost needs a policy

This tool only reads/estimates data about gas costs; it does not execute transactions, write to blockchain state, delete data, or commit financial obligations. The estimation is informational and has no side effects on the blockchain or user's assets.

From the tool's definition The tool is described as 'Estimate the gas cost for a transaction' — it performs a calculation/query operation that retrieves information about hypothetical transaction costs without executing any actual transactions, modifying state, or moving funds.

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

POLICY

How to control estimateGasCost

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

policy.json

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

estimateGasCost 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 Agentek Eth — 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 →

Free to start. No card required.

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 estimateGasCost

What does the estimateGasCost tool do? +

Estimate the gas cost for a transaction in both native token and USD. It is categorised as a Read tool in the Agentek Eth MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on estimateGasCost? +

Register the Agentek Eth MCP server in PolicyLayer and add a rule for estimateGasCost: 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 Agentek Eth. Nothing to install.

What risk level is estimateGasCost? +

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

Can I rate-limit estimateGasCost? +

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

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

estimateGasCost is provided by the Agentek Eth MCP server (nanidao/agentek). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Agentek Eth tool call.

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

CHECK YOUR STACK →