getNFTOwner

THE RISK

Low Risk

Why getNFTOwner needs a policy

This tool queries blockchain data (NFT ownership) without creating, modifying, deleting, or executing any transactions. It is a simple read operation that retrieves publicly available blockchain information. While the server grants access to a wallet and blockchain interactions, this specific tool has no capability to move funds, execute code, modify state, or trigger external operations—it only fetches data.

From the tool's definition Tool name and description indicate a read-only query operation: 'Get the current owner' and 'Returns the Ethereum address' perform data retrieval with no state modification or side effects.

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

POLICY

How to control getNFTOwner

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

policy.json

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

getNFTOwner 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 MCP Ethers Wallet — 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Ethers Wallet tools

Financial prepareERC1155BatchTransfer Prepare an ERC1155 batch transfer transaction for signing. Returns transaction data that c Financial safeBatchTransferERC1155 Safely transfer multiple tokens from the connected wallet to another address in a single t Financial safeTransferERC1155 Safely transfer tokens from the connected wallet to another address Financial safeTransferERC721 Safely transfer an NFT from the connected wallet to another address, with additional data Financial transferERC20 Transfer ERC20 tokens from the connected wallet to another address Financial transferERC721 Transfer an NFT from the connected wallet to another address Financial transferFromERC20 Transfer ERC20 tokens from one address to another (requires approval) Financial transferNFT transferNFT

All 69 MCP Ethers Wallet tools →

Read tools on other servers

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
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 →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about getNFTOwner

What does the getNFTOwner tool do? +

Get the current owner of a specific ERC721 NFT token. Returns the Ethereum address that owns the specified token ID. It is categorised as a Read tool in the MCP Ethers Wallet MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on getNFTOwner? +

Register the MCP Ethers Wallet MCP server in PolicyLayer and add a rule for getNFTOwner: 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 MCP Ethers Wallet. Nothing to install.

What risk level is getNFTOwner? +

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

Can I rate-limit getNFTOwner? +

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

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

getNFTOwner is provided by the MCP Ethers Wallet MCP server (crazyrabbitltc/mcp-ethers-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Ethers Wallet tool call.

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

CHECK YOUR STACK →