Transfer STX to a recipient. Amount in micro-STX (1 STX = 1,000,000 uSTX).
AI agents use stx_transfer_stx to commit financial operations through Bitcoin wallet MCP server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool moves cryptocurrency (Stacks tokens) from one wallet to another, which constitutes a financial transaction that commits monetary value. Misuse by an AI agent could result in unauthorized fund transfers, theft, or loss of user assets. This is the most severe category applicable and warrants critical severity due to direct financial risk and irreversibility of blockchain transactions.
From the tool's definition Tool name 'stx_transfer_stx' performs a transfer operation. Description states 'Transfer STX to a recipient' with amounts specified in micro-STX, indicating actual currency movement.
Attacks that exploit this kind of access
Transfer STX to a recipient. Amount in micro-STX (1 STX = 1,000,000 uSTX). It is categorised as a Financial tool in the Bitcoin wallet MCP server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for stx_transfer_stx: 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 Bitcoin wallet MCP server. Nothing to install.
stx_transfer_stx is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the stx_transfer_stx 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 stx_transfer_stx. 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.
stx_transfer_stx is provided by the Bitcoin wallet MCP server MCP server (markmhendrickson/mcp-server-bitcoin). 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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