Get Account Balance: all cash balances, net of pending withdrawals.
AI agents call account_balance to retrieve information from Kraken Pro MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Although this tool operates in a financial context (Kraken Pro trading platform), it performs only data retrieval—querying account balances—with no side effects. No transactions occur, no money moves, and no orders are placed or modified. The tool is informational only. While the server as a whole contains Financial tools (add_order, cancel_order, etc.), this specific tool is strictly Read.
From the tool's definition Tool name 'account_balance' and description 'Get Account Balance: all cash balances, net of pending withdrawals' indicate a read-only query operation that retrieves account balance information without modifying or moving funds.
Documented attack patterns abuse exactly the kind of access account_balance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kraken Pro MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for account_balance:
{
"version": "1",
"default": "deny",
"tools": {
"account_balance": {}
}
}account_balance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get Account Balance: all cash balances, net of pending withdrawals. It is categorised as a Read tool in the Kraken Pro MCP MCP Server, which means it retrieves data without modifying state.
Register the Kraken Pro MCP server in PolicyLayer and add a rule for account_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 Kraken Pro MCP. Nothing to install.
account_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 account_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 account_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.
account_balance is provided by the Kraken Pro MCP server (oilst/kraken-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kraken Pro MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
17 Kraken Pro MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.