get_erc20_balance | PolicyLayer

WHAT IT DOES

What get_erc20_balance does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents call get_erc20_balance to retrieve information from Sperax Ecosystem Crypto & DeFI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why get_erc20_balance needs a policy

This tool performs a read-only operation on blockchain data. It retrieves the token balance associated with a specific address. There are no side effects, state modifications, or financial transactions involved. The worst-case misuse would be information disclosure about token holdings, which has limited impact compared to write, execute, or destructive operations.

From the tool's definition Tool name 'get_erc20_balance' and description 'Get ERC20 token balance for an address' indicate a query operation that retrieves balance information without modifying state or executing transactions.

Documented attack patterns abuse exactly the kind of access get_erc20_balance gives an agent:

POLICY

How to control get_erc20_balance

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_erc20_balance:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_erc20_balance": {}
  }
}

get_erc20_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 Sperax Ecosystem Crypto & DeFI 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.

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EXPLORE

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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_balance

What does the get_erc20_balance tool do? +

Get ERC20 token balance for an address. It is categorised as a Read tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_erc20_balance? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for get_erc20_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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is get_erc20_balance? +

get_erc20_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_erc20_balance? +

Yes. Add a rate_limit block to the get_erc20_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_balance completely? +

Set action: deny in the PolicyLayer policy for get_erc20_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_balance? +

get_erc20_balance is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.