submit_marketplace_balance

THE RISK

Critical Risk

Why submit_marketplace_balance needs a policy

The tool name and description explicitly reference submitting prepayment balances, which constitutes a financial obligation or transaction. Even though the server description focuses on public API/read operations, this tool clearly involves financial commitments, warranting the Financial category at critical severity due to potential for monetary misuse by an AI agent.

From the tool's definition 'submit_marketplace_balance' and 'Submit prepayment balances' — submitting balances implies committing financial transactions or prepayments

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

POLICY

How to control submit_marketplace_balance

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

policy.json

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

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

Create a free account and register eToro 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 eToro MCP Server tools

Financial domain_buy Purchase a domain Financial marketplace_invoice_action Perform invoice actions like refund Financial submit_marketplace_billing Submit marketplace billing data Financial submit_marketplace_invoice Submit a marketplace invoice Destructive cancel_deployment Cancel a deployment which is currently building Destructive delete_access_group Delete an access group Destructive delete_access_group_project Delete an access group project Destructive delete_alias Delete an Alias with the specified ID

All 154 eToro MCP Server tools →

Financial tools on other servers

0xarchive web3_subscribe Math MCP Server financial_calculator MCP Kling generate_video MCP Uber Server uber_request_ride

Go deeper

Critical-risk tools in eToro 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.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about submit_marketplace_balance

What does the submit_marketplace_balance tool do? +

Submit prepayment balances. It is categorised as a Financial tool in the eToro MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on submit_marketplace_balance? +

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

What risk level is submit_marketplace_balance? +

submit_marketplace_balance 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 submit_marketplace_balance? +

Yes. Add a rate_limit block to the submit_marketplace_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 submit_marketplace_balance completely? +

Set action: deny in the PolicyLayer policy for submit_marketplace_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 submit_marketplace_balance? +

submit_marketplace_balance is provided by the eToro MCP Server MCP server (shlomico-tr/etoroportfoliomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every eToro MCP Server tool call.

Start from eToro 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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