Returns the balance of a given address for a specific ERC6909 token ID from the Coins contract.
AI agents call getCoinBalance 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 queries balances from a blockchain contract, which is a read operation. It retrieves information about token holdings at a given address and does not create, modify, delete, or execute code. The blast radius is minimal—an incorrect query returns inaccurate data but cannot cause financial loss or irreversible damage on its own.
From the tool's definition Tool name 'getCoinBalance' and description 'Returns the balance' indicates a read-only query operation that retrieves data without modifying state or triggering external side effects.
Documented attack patterns abuse exactly the kind of access getCoinBalance 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 getCoinBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getCoinBalance": {}
}
}getCoinBalance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns the balance of a given address for a specific ERC6909 token ID from the Coins contract. 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 getCoinBalance: 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.
getCoinBalance 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 getCoinBalance 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 getCoinBalance. 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.
getCoinBalance 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.
Free to start. No card required.
165 Agentek Eth tools catalogued and risk-classified — across an index of 43,000+ MCP servers.