getAllowance

THE RISK

Low Risk

Why getAllowance needs a policy

This tool performs a read-only query of ERC20 token allowance state on the blockchain. It retrieves information about how much token a spender is allowed to transfer on behalf of an owner, but makes no state changes. The blast radius is minimal—misuse cannot alter balances, approve additional spending, or move funds. It is purely informational.

From the tool's definition Tool name 'getAllowance' and description 'Gets the ERC20 token allowance between an owner and spender' indicate a query operation that retrieves existing allowance data without modification.

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

POLICY

How to control getAllowance

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

policy.json

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

getAllowance 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 Agentek Eth — 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 Agentek Eth tools

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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.
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 →

FAQ

Questions about getAllowance

What does the getAllowance tool do? +

Gets the ERC20 token allowance between an owner and spender. It is categorised as a Read tool in the Agentek Eth MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on getAllowance? +

Register the Agentek Eth MCP server in PolicyLayer and add a rule for getAllowance: 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 Agentek Eth. Nothing to install.

What risk level is getAllowance? +

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

Can I rate-limit getAllowance? +

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

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

getAllowance is provided by the Agentek Eth MCP server (nanidao/agentek). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Agentek Eth tool call.

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

CHECK YOUR STACK →