Compute the topic0 hash for a Solidity event signature
AI agents call get_event_topic 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 is a utility function that derives a hash value from an event signature string. It retrieves no data from external systems, modifies nothing, executes no transactions, and has no destructive, financial, or operational side effects. The output is a read-only computed value useful for EVM event log analysis.
From the tool's definition Tool computes topic0 hash for a Solidity event signature—a deterministic cryptographic operation with no state changes or side effects.
Documented attack patterns abuse exactly the kind of access get_event_topic 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_event_topic:
{
"version": "1",
"default": "deny",
"tools": {
"get_event_topic": {}
}
}get_event_topic is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Compute the topic0 hash for a Solidity event signature. 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_event_topic: 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_event_topic 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_event_topic 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_event_topic. 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_event_topic 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.
Free to start. No card required.
1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.