Returns the events log in a block range, filtered by topics.
AI agents call logs__getLogsByTopics to retrieve information from Etherscan MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves blockchain event logs filtered by topics within a specified block range. It performs a read-only query against Etherscan's blockchain data APIs with no side effects, no state modification, and no code execution. The low severity reflects minimal blast radius—an AI agent misuse would only result in retrieving potentially sensitive event data, not financial loss or system damage.
From the tool's definition Tool name 'getLogsByTopics' and description 'Returns the events log in a block range, filtered by topics' indicate a data retrieval operation. This queries blockchain event logs without modifying or executing transactions.
Documented attack patterns abuse exactly the kind of access logs__getLogsByTopics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Etherscan MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for logs__getLogsByTopics:
{
"version": "1",
"default": "deny",
"tools": {
"logs__getLogsByTopics": {}
}
}logs__getLogsByTopics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns the events log in a block range, filtered by topics. It is categorised as a Read tool in the Etherscan MCP MCP Server, which means it retrieves data without modifying state.
Register the Etherscan MCP server in PolicyLayer and add a rule for logs__getLogsByTopics: 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 Etherscan MCP. Nothing to install.
logs__getLogsByTopics 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 logs__getLogsByTopics 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 logs__getLogsByTopics. 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.
logs__getLogsByTopics is provided by the Etherscan MCP server (xiaok/etherscan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Etherscan MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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56 Etherscan MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.