satoshi_balance_by_address

THE RISK

Low Risk

Why satoshi_balance_by_address needs a policy

This tool only retrieves and queries blockchain data (UTXO balance) without any side effects, state modification, or ability to execute transactions. Even though it operates on financial data (cryptocurrency balances), it is purely informational/read-only and cannot move money or create financial obligations.

From the tool's definition Tool returns balance information (total satoshis) at an address by 'summing all unspent outputs (UTXOs)' with no capability to modify, delete, or transfer funds. The description explicitly indicates it provides 'a direct snapshot' of the address state.

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

POLICY

How to control satoshi_balance_by_address

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

policy.json

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

satoshi_balance_by_address 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 Maestro 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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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 →
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FAQ

Questions about satoshi_balance_by_address

What does the satoshi_balance_by_address tool do? +

Returns the total balance in satoshis held at the specified address or script pubkey by summing all unspent outputs (UTXOs). This is a direct snapshot of the address. It is categorised as a Read tool in the Maestro MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on satoshi_balance_by_address? +

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

What risk level is satoshi_balance_by_address? +

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

Can I rate-limit satoshi_balance_by_address? +

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

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

satoshi_balance_by_address is provided by the Maestro MCP Server MCP server (maestro-org/maestro-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Maestro MCP Server tool call.

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

CHECK YOUR STACK →