Queries the balance of a specific ERC-20 token for the current account on the specified chain.
AI agents call getTokenBalance to retrieve information from Token Minter without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves account balance information without modifying, executing, or affecting any state. It is a straightforward read operation. The low severity reflects minimal risk even if misused by an AI agent, as querying balances cannot cause harm.
From the tool's definition Tool name is 'getTokenBalance' and description states it 'Queries the balance of a specific ERC-20 token' — a pure data retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access getTokenBalance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Token Minter, and nothing reaches the server without passing your rules. This is the rule we recommend for getTokenBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getTokenBalance": {}
}
}getTokenBalance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Queries the balance of a specific ERC-20 token for the current account on the specified chain. It is categorised as a Read tool in the Token Minter MCP Server, which means it retrieves data without modifying state.
Register the Token Minter MCP server in PolicyLayer and add a rule for getTokenBalance: 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 Token Minter. Nothing to install.
getTokenBalance 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 getTokenBalance 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 getTokenBalance. 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.
getTokenBalance is provided by the Token Minter MCP server (kukapay/token-minter-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Token Minter, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Token Minter tools catalogued and risk-classified — across an index of 43,000+ MCP servers.