Compute the Keccak-256 hash of a value. Used for hashing in Ethereum (function selectors, event topics, etc.)
AI agents call keccak256_hash 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.
Hashing is a fundamental cryptographic read operation that computes a deterministic output from input data. It neither retrieves external data, modifies state, executes arbitrary code, deletes data, nor initiates financial transactions. The hash output is used for verification and identification purposes only.
From the tool's definition Tool description states 'Compute the Keccak-256 hash of a value' for hashing in Ethereum contexts like 'function selectors, event topics'.
Documented attack patterns abuse exactly the kind of access keccak256_hash 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 keccak256_hash:
{
"version": "1",
"default": "deny",
"tools": {
"keccak256_hash": {}
}
}keccak256_hash 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 Keccak-256 hash of a value. Used for hashing in Ethereum (function selectors, event topics, etc.). 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 keccak256_hash: 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.
keccak256_hash 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 keccak256_hash 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 keccak256_hash. 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.
keccak256_hash 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.