Get total Bitcoin balance from an xpub/zpub key (Ledger Native SegWit). Derives all child addresses, queries each via Blockstream, and sums the balance. Scans until it hits 20 consecutive unused addresses (BIP44 gap limit).
AI agents call get_bitcoin_xpub_balance to retrieve information from Zerion without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs data retrieval and aggregation only. While it accesses financial account information (Bitcoin balance), it does not move money, execute trades, modify state, or perform destructive operations. The Financial category applies when money is moved or obligations committed; this tool merely observes balances.
From the tool's definition Tool retrieves Bitcoin balance data via public APIs (Blockstream) without modifying, deleting, or executing transactions.
Attacks that exploit this kind of access
Get total Bitcoin balance from an xpub/zpub key (Ledger Native SegWit). Derives all child addresses, queries each via Blockstream, and sums the balance. Scans until it hits 20 consecutive unused addresses (BIP44 gap limit). It is categorised as a Read tool in the Zerion MCP Server, which means it retrieves data without modifying state.
Register the Zerion MCP server in PolicyLayer and add a rule for get_bitcoin_xpub_balance: 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 Zerion. Nothing to install.
get_bitcoin_xpub_balance 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_bitcoin_xpub_balance 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_bitcoin_xpub_balance. 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_bitcoin_xpub_balance is provided by the Zerion MCP server (rockyale/zerion-mcp). 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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