getERC20Allowance

Get the amount of tokens approved for a spender to use from an owner

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/geterc20allowance.md

WHAT IT DOES

What getERC20Allowance does on MCP Ethers Wallet

AI agents call getERC20Allowance 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 getERC20Allowance is rated Low

This tool queries blockchain state to retrieve an ERC20 allowance value. It has no side effects and does not modify, execute, or delete anything. While it operates in a financial domain (ERC20 tokens), the tool itself performs no financial transaction or movement of value — it only reads approval metadata. Thus it is categorized as Read with low severity, as an agent cannot cause direct harm by calling this tool.

From the tool's definition Tool description states 'Get the amount of tokens approved for a spender to use from an owner' — this retrieves existing allowance data without modifying state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs getERC20Allowance 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 getERC20Allowance, this is the rule to start with:

getERC20Allowance Allowed

getERC20Allowance 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": {
    "getERC20Allowance": {}
  }
}

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 getERC20Allowance call is checked against it from then on.

FAQ

Questions about getERC20Allowance

What does the getERC20Allowance tool do? +

Get the amount of tokens approved for a spender to use from an owner. 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 getERC20Allowance? +

Register the MCP Ethers Wallet MCP server in PolicyLayer and add a rule for getERC20Allowance: 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 getERC20Allowance? +

getERC20Allowance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit getERC20Allowance? +

Yes. Add a rate_limit block to the getERC20Allowance 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 getERC20Allowance completely? +

Set action: deny in the PolicyLayer policy for getERC20Allowance. 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 getERC20Allowance? +

getERC20Allowance 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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