erc20_balanceOf

Get the ERC20 token balance for a specific address. Alternative naming for compatibility with MCP client tests.

SERVERMCP Ethers Wallet SOURCEcrazyrabbitltc/mcp-ethers-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/crazyrabbitltc-mcp-ethers-server/erc20-balanceof.md

WHAT IT DOES

What erc20_balanceOf does on MCP Ethers Wallet

AI agents call erc20_balanceOf to retrieve information from MCP Ethers Wallet without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why erc20_balanceOf is rated Low

This tool performs a read-only operation on a blockchain to fetch token balance information. It does not modify state, execute code, delete data, or move funds. The blast radius of misuse is minimal—an attacker could only enumerate wallet balances, which is already public blockchain data. This is a straightforward Read category tool.

From the tool's definition Tool name 'erc20_balanceOf' and description 'Get the ERC20 token balance for a specific address' indicate a query operation that retrieves data without side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs erc20_balanceOf safely

PolicyLayer is an MCP gateway: it sits between your AI agents and MCP Ethers Wallet, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For erc20_balanceOf, this is the rule to start with:

erc20_balanceOf Allowed

erc20_balanceOf is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "erc20_balanceOf": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect MCP Ethers Wallet, apply this rule, and every erc20_balanceOf call is checked against it from then on.

FAQ

Questions about erc20_balanceOf

What does the erc20_balanceOf tool do? +

Get the ERC20 token balance for a specific address. Alternative naming for compatibility with MCP client tests. 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 erc20_balanceOf? +

Register the MCP Ethers Wallet MCP server in PolicyLayer and add a rule for erc20_balanceOf: 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 erc20_balanceOf? +

erc20_balanceOf is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit erc20_balanceOf? +

Yes. Add a rate_limit block to the erc20_balanceOf 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 erc20_balanceOf completely? +

Set action: deny in the PolicyLayer policy for erc20_balanceOf. 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 erc20_balanceOf? +

erc20_balanceOf 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.

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