get_wallet_balance
AI agents call get_wallet_balance to retrieve information from BTCPay Server MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves wallet balance information without modifying or executing any financial transactions. Despite the empty description, the 'get_' pattern combined with sibling tools like 'get_invoice', 'get_server_info', and 'get_store_info' confirms this is a read operation. Severity is low because misuse yields only information disclosure, not unauthorized transactions or data destruction.
From the tool's definition Tool name 'get_wallet_balance' indicates a data retrieval operation. The 'get_' prefix is a standard convention for read-only queries.
Attacks that exploit this kind of access
get_wallet_balance. It is categorised as a Read tool in the BTCPay Server MCP MCP Server, which means it retrieves data without modifying state.
Register the BTCPay Server MCP server in PolicyLayer and add a rule for get_wallet_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 BTCPay Server MCP. Nothing to install.
get_wallet_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_wallet_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_wallet_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_wallet_balance is provided by the BTCPay Server MCP server (ThomsenDrake/btcpay-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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