READ-ONLY — current Bitcoin fee-rate recommendations in sat/vB. Returns five labels: fastestFee (~next block), halfHourFee (~3 blocks), hourFee (~6 blocks), economyFee (~144 blocks / 1 day), and minimumFee (mempool floor). Sourced from mempool.space's /v1/fees/recommended endpoint when available;...
AI agents call get_btc_fee_estimates to retrieve information from VaultPilot MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though get_btc_fee_estimates only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
READ-ONLY — current Bitcoin fee-rate recommendations in sat/vB. Returns five labels: fastestFee (~next block), halfHourFee (~3 blocks), hourFee (~6 blocks), economyFee (~144 blocks / 1 day), and minimumFee (mempool floor). Sourced from mempool.space's /v1/fees/recommended endpoint when available; falls back to per-target estimates from the standard Esplora /fee-estimates for self-hosted indexers. It is categorised as a Read tool in the VaultPilot MCP MCP Server, which means it retrieves data without modifying state.
Register the VaultPilot MCP server in PolicyLayer and add a rule for get_btc_fee_estimates: 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 VaultPilot MCP. Nothing to install.
get_btc_fee_estimates 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 get_btc_fee_estimates 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 get_btc_fee_estimates. 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.
get_btc_fee_estimates is provided by the VaultPilot MCP server (vaultpilot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.