Get available balance in the custodial sub-account for trading. ⚠️ REQUIRES CUSTODIAL SOLUTION API KEY Returns the balance available for placing new orders.
AI agents call binance_us_cust_available_balance to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves account balance information without creating, modifying, deleting, or executing any financial transactions. Despite high sensitivity due to the custodial financial context and API key requirement, the core function is read-only data retrieval.
From the tool's definition Tool description states 'Get available balance' - a retrieval operation with no modification or side effects. The custodial context and requirement for API key indicate access to sensitive financial data.
Documented attack patterns abuse exactly the kind of access binance_us_cust_available_balance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for binance_us_cust_available_balance:
{
"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.
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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 BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain 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 BNB Chain MCP. Nothing to install.
binance_us_cust_available_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 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.
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.
binance_us_cust_available_balance is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.