AI agents call getEthBalance to retrieve information from Ethereum Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves balance data from the blockchain without modifying, executing operations, or committing financial transactions. It is a straightforward read operation. While the description is empty (reducing confidence slightly), the tool name and server context provide sufficient evidence to classify it as Read with low severity.
From the tool's definition Tool name 'getEthBalance' indicates a data retrieval operation that queries Ethereum wallet balance information.
Documented attack patterns abuse exactly the kind of access getEthBalance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ethereum Tools, and nothing reaches the server without passing your rules. This is the rule we recommend for getEthBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getEthBalance": {}
}
}getEthBalance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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getEthBalance. It is categorised as a Read tool in the Ethereum Tools MCP Server, which means it retrieves data without modifying state.
Register the Ethereum Tools MCP server in PolicyLayer and add a rule for getEthBalance: 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 Ethereum Tools. Nothing to install.
getEthBalance is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the getEthBalance 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.
Set action: deny in the PolicyLayer policy for getEthBalance. 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.
getEthBalance is provided by the Ethereum Tools MCP server (0xgval/evm-mcp-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ethereum Tools, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Ethereum Tools tools catalogued and risk-classified — across an index of 43,000+ MCP servers.