is_contract · Sperax Ecosystem Crypto & DeFI MCP Server MCP

WHAT IT DOES

What is_contract does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents call is_contract 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 is_contract needs a policy

This tool performs a simple lookup/verification of blockchain address properties. It retrieves information about whether an address holds contract code but does not modify state, execute code, move funds, or delete data. The operation is purely informational with minimal risk even if misused by an agent.

From the tool's definition Tool description states it 'Check[s] if an address is a smart contract or an externally owned account (EOA)' — a read-only query operation with no side effects or data modification.

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

POLICY

How to control is_contract

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 is_contract:

policy.json

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

is_contract 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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All 1318 Sperax Ecosystem Crypto & DeFI MCP Server 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 is_contract

What does the is_contract tool do? +

Check if an address is a smart contract or an externally owned account (EOA). 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 is_contract? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for is_contract: 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 is_contract? +

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

Can I rate-limit is_contract? +

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

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

is_contract 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.

CHECK YOUR STACK →

Free to start. No card required.

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