Estimate energy and bandwidth cost for a smart contract call.
AI agents call estimate_contract_call to retrieve information from MERX - TRON Resource Exchange without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/computes an estimate based on input parameters. It does not execute a contract call (which would be Execute), approve transactions (Write), or commit financial obligations (Financial). The word 'estimate' indicates it provides informational output only. The blast radius of misuse is minimal—an agent could request estimates maliciously, but no funds move and no data is altered.
From the tool's definition Tool name 'estimate_contract_call' and description 'Estimate energy and bandwidth cost for a smart contract call' indicate a read-only operation that calculates and returns cost projections without executing transactions or modifying any state.
Attacks that exploit this kind of access
Estimate energy and bandwidth cost for a smart contract call. It is categorised as a Read tool in the MERX - TRON Resource Exchange MCP Server, which means it retrieves data without modifying state.
Register the MERX - TRON Resource Exchange MCP server in PolicyLayer and add a rule for estimate_contract_call: 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 MERX - TRON Resource Exchange. Nothing to install.
estimate_contract_call 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 estimate_contract_call 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 estimate_contract_call. 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.
estimate_contract_call is provided by the MERX - TRON Resource Exchange MCP server (Hovsteder/merx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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