binance_us_cust_available_balance

THE RISK

Low Risk

Why binance_us_cust_available_balance needs a policy

This tool retrieves account balance information without side effects. However, severity is elevated to 'medium' rather than 'low' because: (1) the custodial sub-account context and API key requirement indicate it accesses sensitive financial account data; (2) balance information could be used to infer account details or inform social engineering; (3) it operates within the Binance.US financial platform where misuse…

From the tool's definition Tool name contains 'get' action pattern (binance_us_cust_available_balance) and description states 'Get available balance' and 'Returns the balance available' — purely retrieval operations with no modification, deletion, or transaction capabilities.

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

POLICY

How to control binance_us_cust_available_balance

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

policy.json

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

binance_us_cust_available_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 Binance US 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.

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EXPLORE

Related tools and policies

More Binance US MCP Server tools

Financial binance_us_cancel_replace Cancel an existing order and place a new order on the same symbol atomically. This is usef Financial binance_us_cust_new_order Place a new trade order through the custodial solution. ⚠️ REQUIRES CUSTODIAL SOLUTION AP Financial binance_us_new_oco Place a new OCO (One-Cancels-the-Other) order on Binance.US. OCO orders combine a limit or Financial binance_us_new_order Place a new trade order on Binance.US. Supports LIMIT, MARKET, STOP_LOSS, STOP_LOSS_LIMIT, Financial binance_us_cl_transfer Transfer assets in or out of your credit line account. ⚠️ REQUIRES CREDIT LINE API KEY - Financial binance_us_cust_transfer Transfer assets from custodial partner account to Binance.US custodial sub-account. ⚠️ RE Financial binance_us_cust_undo_transfer Undo a previous transfer from your custodial partner. ⚠️ REQUIRES CUSTODIAL SOLUTION API Financial binance_us_cust_wallet_transfer Transfer assets from Binance.US exchange wallet to custodial sub-account. ⚠️ REQUIRES CUS

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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 binance_us_cust_available_balance

What does the binance_us_cust_available_balance tool do? +

Get available balance in the custodial sub-account for trading. ⚠️ REQUIRES CUSTODIAL SOLUTION API KEY Returns the balance available for placing new orders. It is categorised as a Read tool in the Binance US MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on binance_us_cust_available_balance? +

Register the Binance US MCP Server MCP server in PolicyLayer and add a rule for binance_us_cust_available_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 Binance US MCP Server. Nothing to install.

What risk level is binance_us_cust_available_balance? +

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

Can I rate-limit binance_us_cust_available_balance? +

Yes. Add a rate_limit block to the binance_us_cust_available_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 binance_us_cust_available_balance completely? +

Set action: deny in the PolicyLayer policy for binance_us_cust_available_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 binance_us_cust_available_balance? +

binance_us_cust_available_balance is provided by the Binance US MCP Server MCP server (nirholas/binance-us-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Binance US MCP Server tool call.

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

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