AI agents call estimate_gas to retrieve information from 0g without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries blockchain data (gas prices, network conditions) to compute an estimate. It produces no side effects, does not execute a transaction, and does not modify any data. It is a standard query operation found on blockchain networks to help users understand transaction costs before committing them.
From the tool's definition The tool name is 'estimate_gas' and description states it 'Estimate gas for a transaction on 0G network'. The verb 'estimate' and the sibling tools (get_balance, get_block, get_network_info, get_transaction) all indicate read-only query operations.
Attacks that exploit this kind of access
Estimate gas for a transaction on 0G network. It is categorised as a Read tool in the 0g MCP Server, which means it retrieves data without modifying state.
Register the 0g MCP server in PolicyLayer and add a rule for estimate_gas: 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 0g. Nothing to install.
estimate_gas 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_gas 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_gas. 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_gas is provided by the 0g MCP server (opencolin/0g-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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