binance_us_subaccount_transfer

THE RISK

Critical Risk

Why binance_us_subaccount_transfer needs a policy

This tool directly moves cryptocurrency assets between accounts, which constitutes a financial transaction that commits funds and has irreversible effects on account balances. An AI agent misusing this tool could transfer substantial sums without proper authorization or to incorrect addresses, causing direct financial loss. This is the most severe risk category applicable.

From the tool's definition Tool description explicitly states 'Execute an asset transfer between master account and a sub-account' and warns '⚠️ This moves funds between accounts!' The tool name includes 'transfer' which is a financial operation.

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

POLICY

How to control binance_us_subaccount_transfer

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for binance_us_subaccount_transfer:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "binance_us_subaccount_transfer": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to binance_us_subaccount_transfer is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register Sperax Ecosystem Crypto & DeFI 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

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Go deeper

Critical-risk tools in Sperax Ecosystem Crypto & DeFI MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
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FAQ

Questions about binance_us_subaccount_transfer

What does the binance_us_subaccount_transfer tool do? +

Execute an asset transfer between master account and a sub-account. ⚠️ This moves funds between accounts!. It is categorised as a Financial tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on binance_us_subaccount_transfer? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for binance_us_subaccount_transfer: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is binance_us_subaccount_transfer? +

binance_us_subaccount_transfer is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit binance_us_subaccount_transfer? +

Yes. Add a rate_limit block to the binance_us_subaccount_transfer 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_subaccount_transfer completely? +

Set action: deny in the PolicyLayer policy for binance_us_subaccount_transfer. 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_subaccount_transfer? +

binance_us_subaccount_transfer is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI 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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