executeSwap

THE RISK

Critical Risk

This tool performs actual token swaps on-chain using a stored private key, which constitutes a financial transaction moving cryptocurrency assets. It commits financial obligations by exchanging tokens via a DEX aggregator, and is irreversible once submitted to the blockchain. Misuse could result in significant financial loss.

From the tool's definition Execute a token swap using Jupiter DEX aggregator (using private key from .env)

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

HOW TO CONTROL EXECUTESWAP

PolicyLayer is an MCP gateway — it sits between your AI agents and Web3 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for executeSwap:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "executeSwap": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to executeSwap is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register Web3 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.

GATE THIS TOOL →

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EXPLORE

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All 55 Web3 MCP Server tools →

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Go deeper

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All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
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FAQ

What does the executeSwap tool do? +

Execute a token swap using Jupiter DEX aggregator (using private key from .env). It is categorised as a Financial tool in the Web3 MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on executeSwap? +

Register the Web3 MCP Server MCP server in PolicyLayer and add a rule for executeSwap: 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 Web3 MCP Server. Nothing to install.

What risk level is executeSwap? +

executeSwap is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit executeSwap? +

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

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

executeSwap is provided by the Web3 MCP Server MCP server (strangelove-ventures/web3-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Web3 MCP Server tool call.

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// WHAT EXECUTESWAP ON WEB3 MCP SERVER DOES

// THE RISK

// HOW TO CONTROL EXECUTESWAP

// EXPLORE