AI agents call get_erc20_balance to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries blockchain state to retrieve balance information. It has no side effects, cannot execute code, cannot move funds, and cannot modify data. The blast radius of misuse is minimal—an attacker could only view balance information they could already observe on the public blockchain.
From the tool's definition Tool name 'get_erc20_balance' and description 'Get ERC20 token balance for an address' indicate a read-only operation that retrieves balance data without modifying, executing, or transferring any assets.
Documented attack patterns abuse exactly the kind of access get_erc20_balance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_erc20_balance:
{
"version": "1",
"default": "deny",
"tools": {
"get_erc20_balance": {}
}
}get_erc20_balance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get ERC20 token balance for an address. It is categorised as a Read tool in the BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain MCP server in PolicyLayer and add a rule for get_erc20_balance: 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 BNB Chain MCP. Nothing to install.
get_erc20_balance 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 get_erc20_balance 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 get_erc20_balance. 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.
get_erc20_balance is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.