gas__gasoracle

THE RISK

Low Risk

Why gas__gasoracle needs a policy

This tool queries current gas price information from the Ethereum blockchain, which is a read-only operation with no side effects, no code execution, and no financial transactions. It simply retrieves and returns publicly available data. The gas prices themselves are informational and do not authorize any fund movement or irreversible actions when accessed.

From the tool's definition Tool name 'gas__gasoracle' and description 'Returns the current Safe, Proposed and Fast gas prices' indicate a read-only query operation that retrieves blockchain gas price data without modifying state or executing transactions.

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

POLICY

How to control gas__gasoracle

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 gas__gasoracle:

policy.json

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

gas__gasoracle 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

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 gas__gasoracle

What does the gas__gasoracle tool do? +

Returns the current Safe, Proposed and Fast gas prices. 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 gas__gasoracle? +

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

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

Can I rate-limit gas__gasoracle? +

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

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

gas__gasoracle 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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