Current sat/vB fee recommendations.
AI agents call recommended_fees to retrieve information from Mcp Mempool Space without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries current fee recommendation data from the mempool. It has no side effects, does not execute code or commands, does not modify any blockchain or application state, and does not involve financial transactions. It is purely informational, similar to other sibling tools like 'mempool_stats' and 'hashrate' which are likewise data retrieval operations.
From the tool's definition Tool description states 'Current sat/vB fee recommendations' - a query operation that retrieves fee data without modifying state.
Attacks that exploit this kind of access
Current sat/vB fee recommendations. It is categorised as a Read tool in the Mcp Mempool Space MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mempool Space MCP server in PolicyLayer and add a rule for recommended_fees: 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 Mcp Mempool Space. Nothing to install.
recommended_fees 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 recommended_fees 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 recommended_fees. 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.
recommended_fees is provided by the Mcp Mempool Space MCP server (pipeworx-io/mcp-mempool-space). 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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