AI agents call getTokensBalance 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.
The 'get' prefix combined with 'Balance' strongly suggests this tool retrieves token balance information from the blockchain without modifying state. Although the description is empty, the naming pattern and server context (wallet analysis, on-chain data retrieval) indicate a read-only query operation. No side effects, no irreversible actions, no code execution, and no financial transactions are implied.
From the tool's definition Tool name 'getTokensBalance' indicates a retrieval operation (get + query). Contextually, this is part of an Ethereum analysis toolkit focused on blockchain data retrieval.
Documented attack patterns abuse exactly the kind of access getTokensBalance 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 getTokensBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getTokensBalance": {}
}
}getTokensBalance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
getTokensBalance. 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 getTokensBalance: 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.
getTokensBalance 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 getTokensBalance 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 getTokensBalance. 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.
getTokensBalance 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.
Free to start. No card required.
11 Ethereum Tools tools catalogued and risk-classified — across an index of 43,000+ MCP servers.