sendEvmTransaction

THE RISK

Critical Risk

This tool transfers cryptocurrency (native tokens) on EVM-compatible blockchains, which constitutes a financial transaction that moves real monetary value. It uses a stored private key to sign and broadcast transactions, meaning misuse could result in irreversible loss of funds. The blast radius is critical since an AI agent could drain wallet funds across any supported EVM network.

From the tool's definition Send native tokens on any supported EVM network (using private key from .env)

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

HOW TO CONTROL SENDEVMTRANSACTION

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 sendEvmTransaction:

policy.json

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

Any call to sendEvmTransaction 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.

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EXPLORE

More Web3 MCP Server tools

Financial executeSwap Execute a token swap using Jupiter DEX aggregator (using private key from .env) Financial transfer Transfer SOL from your keypair (using private key from .env) to another address Financial approveEvmToken Approve ERC-20 token spending on any supported EVM network (using private key from .env) Financial createXrpTrustline Create a trustline for a token on the XRP Ledger using private key from .env Financial sendCardanoAda Send ADA from your wallet to a recipient address Financial sendCardanoTokens Send Cardano native tokens from your wallet to a recipient address Financial sendEvmToken Send ERC-20 tokens on any supported EVM network (using private key from .env) Financial sendTonTransaction Send TON from your wallet to another address using mnemonic from .env

All 55 Web3 MCP Server tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Web3 MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

What does the sendEvmTransaction tool do? +

Send native tokens on any supported EVM network (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 sendEvmTransaction? +

Register the Web3 MCP Server MCP server in PolicyLayer and add a rule for sendEvmTransaction: 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 sendEvmTransaction? +

sendEvmTransaction 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 sendEvmTransaction? +

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

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

sendEvmTransaction 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 SENDEVMTRANSACTION ON WEB3 MCP SERVER DOES

// THE RISK

// HOW TO CONTROL SENDEVMTRANSACTION

// EXPLORE