Determine if an address is a contract, EOA, or known entity
AI agents call check_address_type 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 performs address type classification by querying blockchain data (distinguishing between externally owned accounts, smart contracts, and known entities). It is purely informational with no ability to modify, execute, or delete data.
From the tool's definition Tool description states 'Determine if an address is a contract, EOA, or known entity' — this is a query/lookup operation that retrieves classification information about an address with no side effects.
Documented attack patterns abuse exactly the kind of access check_address_type 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 check_address_type:
{
"version": "1",
"default": "deny",
"tools": {
"check_address_type": {}
}
}check_address_type is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Determine if an address is a contract, EOA, or known entity. 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 check_address_type: 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.
check_address_type 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 check_address_type 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 check_address_type. 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.
check_address_type 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.