fetch_account_balance

THE RISK

Low Risk

Why fetch_account_balance needs a policy

This tool retrieves data without side effects, making it a Read category. Severity is high because unauthorized exposure of account balances could enable targeted attacks, account enumeration, or inform malicious trading decisions by a compromised agent. The tool itself is read-only, preventing direct financial loss, but the information disclosed is highly sensitive in a financial context.

From the tool's definition Tool name is 'fetch_account_balance' and description states it 'Fetches the current balance' — a read operation with no modification.

Documented attack patterns abuse exactly the kind of access fetch_account_balance gives an agent:

POLICY

How to control fetch_account_balance

PolicyLayer is an MCP gateway — it sits between your AI agents and CCXT MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_account_balance:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fetch_account_balance": {}
  }
}

fetch_account_balance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register CCXT MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More CCXT MCP Server tools

Financial cancel_order Cancels an existing open order on an exchange. Financial withdraw_cryptocurrency Initiates a cryptocurrency withdrawal to a specified address. Financial create_futures_limit_order Places a new limit order in a futures/swap market. Financial create_futures_market_order Places a new market order in a futures/swap market, filled at the best available current p Financial create_spot_limit_order Places a new limit order in the spot market. Financial create_spot_market_order Places a new market order in the spot market, to be filled at the best available current p Financial set_trading_leverage Sets the leverage for a specific trading symbol, typically in futures or margin markets. Read calculate_technical_indicator Fetches OHLCV data for a given symbol and timeframe, then calculates a specified technical

All 19 CCXT MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about fetch_account_balance

What does the fetch_account_balance tool do? +

Fetches the current balance of an account from a specified cryptocurrency exchange. It is categorised as a Read tool in the CCXT MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on fetch_account_balance? +

Register the CCXT MCP Server MCP server in PolicyLayer and add a rule for fetch_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 CCXT MCP Server. Nothing to install.

What risk level is fetch_account_balance? +

fetch_account_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit fetch_account_balance? +

Yes. Add a rate_limit block to the fetch_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.

How do I block fetch_account_balance completely? +

Set action: deny in the PolicyLayer policy for fetch_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.

What MCP server provides fetch_account_balance? +

fetch_account_balance is provided by the CCXT MCP Server MCP server (jcwleo/ccxt-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CCXT MCP Server tool call.

Start from CCXT MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →