setDefaultDepositToAccount

THE RISK

Medium Risk

Why setDefaultDepositToAccount needs a policy

This tool modifies account configuration (default deposit destination) which is a reversible write operation. It doesn't move funds directly but changes where future deposits are routed, which could have significant financial implications if misconfigured. Severity is medium because it affects fund routing but doesn't directly move money or delete data.

From the tool's definition Set the default account type for receiving on-chain deposit funds

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

POLICY

How to control setDefaultDepositToAccount

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "setDefaultDepositToAccount": {
      "limits": [
        {
          "counter": "setdefaultdeposittoaccount_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

setDefaultDepositToAccount stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Bybit 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

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about setDefaultDepositToAccount

What does the setDefaultDepositToAccount tool do? +

Set the default account type for receiving on-chain deposit funds.\n- Only main UID API key can call this endpoint\n- Sub-accounts are not allowed\n- Funds default to. It is categorised as a Write tool in the Bybit MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on setDefaultDepositToAccount? +

Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for setDefaultDepositToAccount: 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 Bybit MCP Server. Nothing to install.

What risk level is setDefaultDepositToAccount? +

setDefaultDepositToAccount is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit setDefaultDepositToAccount? +

Yes. Add a rate_limit block to the setDefaultDepositToAccount 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 setDefaultDepositToAccount completely? +

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

setDefaultDepositToAccount is provided by the Bybit MCP Server MCP server (bybit-exchange/trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bybit MCP Server tool call.

Start from Bybit 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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