Returns the current amount of an ERC-20 token in circulation.
AI agents call stats__tokensupply 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 performs a read-only query to fetch token supply information from the Etherscan API. It retrieves data but has no side effects, does not execute code or commands, does not modify data, and does not involve financial transactions or irreversible actions. It is clearly in the 'Read' category. Severity is low because misuse would only result in information disclosure with minimal blast radius.
From the tool's definition Tool name 'stats__tokensupply' and description 'Returns the current amount of an ERC-20 token in circulation' indicate a query operation that retrieves blockchain data without modifying state or executing code.
Documented attack patterns abuse exactly the kind of access stats__tokensupply 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 stats__tokensupply:
{
"version": "1",
"default": "deny",
"tools": {
"stats__tokensupply": {}
}
}stats__tokensupply 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 current amount of an ERC-20 token in circulation. 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 stats__tokensupply: 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.
stats__tokensupply 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 stats__tokensupply 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 stats__tokensupply. 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.
stats__tokensupply 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.