get_erc20_token_balance

THE RISK

Low Risk

Why get_erc20_token_balance needs a policy

ERC20 token balance queries retrieve financial data but do not modify state, execute code with side effects, or move funds. The tool simply reads token balances from a blockchain or account. Despite the empty description, the naming convention and sibling context strongly indicate this is a read operation with minimal risk of misuse.

From the tool's definition Tool name 'get_erc20_token_balance' indicates a query/retrieval operation. The prefix 'get_' is characteristic of Read operations.

Documented attack patterns abuse exactly the kind of access get_erc20_token_balance gives an agent:

POLICY

How to control get_erc20_token_balance

PolicyLayer is an MCP gateway — it sits between your AI agents and Story SDK MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_erc20_token_balance:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_erc20_token_balance": {}
  }
}

get_erc20_token_balance 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 Story SDK MCP Server — 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 →

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EXPLORE

Related tools and policies

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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 get_erc20_token_balance

What does the get_erc20_token_balance tool do? +

get_erc20_token_balance. It is categorised as a Read tool in the Story SDK MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_erc20_token_balance? +

Register the Story SDK MCP Server MCP server in PolicyLayer and add a rule for get_erc20_token_balance: 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 Story SDK MCP Server. Nothing to install.

What risk level is get_erc20_token_balance? +

get_erc20_token_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_erc20_token_balance? +

Yes. Add a rate_limit block to the get_erc20_token_balance 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 get_erc20_token_balance completely? +

Set action: deny in the PolicyLayer policy for get_erc20_token_balance. 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 get_erc20_token_balance? +

get_erc20_token_balance is provided by the Story SDK MCP Server MCP server (piplabs/story-mcp-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Story SDK MCP Server tool call.

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

CHECK YOUR STACK →