Get the native token (ETH) balance for an address. If chainId is omitted, returns balances across all supported chains.
AI agents call getBalance to retrieve information from Agentek Eth without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves balance information for a blockchain address without any ability to transfer, spend, or modify funds. It is a read-only query operation with no side effects. While the server context involves cryptocurrency, this specific tool does not move money, execute transactions, or perform any write/execute/destructive operations.
From the tool's definition Tool description: 'Get the native token (ETH) balance for an address.' The verb 'Get' and the function of retrieving/querying balance data with no modification capability.
Documented attack patterns abuse exactly the kind of access getBalance gives an agent:
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 getBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getBalance": {}
}
}getBalance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the native token (ETH) balance for an address. If chainId is omitted, returns balances across all supported chains. It is categorised as a Read tool in the Agentek Eth MCP Server, which means it retrieves data without modifying state.
Register the Agentek Eth MCP server in PolicyLayer and add a rule for getBalance: 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.
getBalance 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 getBalance 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 getBalance. 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.
getBalance 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.
Start from Agentek Eth, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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165 Agentek Eth tools catalogued and risk-classified — across an index of 43,000+ MCP servers.