esplora_address_utxos

Get the list of unspent transaction outputs associated with the address/scripthash. Available fields: txid, vout, value, and status (with the status of the funding tx).

ServerMaestro MCP Server
CategoryRead

How to control esplora_address_utxos ↓

WHAT IT DOES

What esplora_address_utxos does on Maestro MCP Server

AI agents call esplora_address_utxos to retrieve information from Maestro MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why esplora_address_utxos needs a policy

This tool performs a read-only query of blockchain data. It retrieves information about UTXOs without modifying state, executing code, or affecting assets. The blast radius of misuse is minimal—at worst, an attacker gains visibility into transaction history or wallet composition, which is already public on the blockchain. No financial transactions, state changes, or irreversible actions are possible.

From the tool's definition Tool retrieves a list of unspent transaction outputs (UTXOs) associated with an address. Description explicitly states 'Get the list' and 'Available fields: txid, vout, value, and status'. No modification, deletion, or execution of commands.

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

POLICY

How to control esplora_address_utxos

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 esplora_address_utxos:

policy.json

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

esplora_address_utxos 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.

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EXPLORE

Related tools and policies

More Maestro MCP Server tools

Destructive EventManagerService_DeleteTrigger Remove a trigger Deletes a specific trigger identified by its unique \ Execute esplora_broadcast_transaction Broadcast a raw transaction to the network. The transaction should be provided as hex in t Execute rpc_submit_transaction Pushes a signed raw transaction to the network. Write EventManagerService_CreateTrigger Create a new trigger Adds a trigger to a manager to listen for specific blockchain activ Write EventManagerService_UpdateTrigger Update a trigger Allows modification of a trigger Read rpc_block_range_info Fetches basic info for a contiguous block range (start and end height). Read brc20_transfer_inscriptions_by_address Returns all unspent BRC20 transfer inscriptions residing at the address. This endpoint is Read activity_by_inscription Lists all transactions that have involved the given inscription, starting from its origin

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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.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about esplora_address_utxos

What does the esplora_address_utxos tool do? +

Get the list of unspent transaction outputs associated with the address/scripthash. Available fields: txid, vout, value, and status (with the status of the funding tx). 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 esplora_address_utxos? +

Register the Maestro MCP Server MCP server in PolicyLayer and add a rule for esplora_address_utxos: 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 esplora_address_utxos? +

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

Can I rate-limit esplora_address_utxos? +

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

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

esplora_address_utxos 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.

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117 Maestro MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.