getNFTTokenURI

THE RISK

Low Risk

Why getNFTTokenURI needs a policy

This tool retrieves metadata (URI) associated with an NFT, which is a read-only operation on blockchain data with no state change, no code execution, and no financial impact. The description is empty, but the name and context from similar sibling tools (particularly 'erc1155_uri') strongly indicate a read operation. Severity is low because it only exposes publicly available blockchain metadata.

From the tool's definition Tool name 'getNFTTokenURI' indicates retrieval of a URI/metadata for an NFT token. Sibling tools like 'erc721_balanceOf', 'erc20_balanceOf', and 'erc1155_uri' are all read-only queries that retrieve blockchain data without modification or execution of…

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

POLICY

How to control getNFTTokenURI

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 getNFTTokenURI:

policy.json

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

getNFTTokenURI 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.

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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 →

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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 getNFTTokenURI

What does the getNFTTokenURI tool do? +

getNFTTokenURI. 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 getNFTTokenURI? +

Register the MCP Ethers Wallet MCP server in PolicyLayer and add a rule for getNFTTokenURI: 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 getNFTTokenURI? +

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

Can I rate-limit getNFTTokenURI? +

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

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

getNFTTokenURI 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.

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