AI agents use eth_swap_tokens to commit financial operations through PortalMCP — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool performs DeFi token swaps on Uniswap V3, directly committing financial transactions using the user's wallet. It moves real cryptocurrency assets between token pairs, constituting a financial obligation/transfer. Misuse by an AI agent could result in significant financial losses through unfavorable swaps, draining wallet funds, or manipulation into malicious token swaps.
From the tool's definition Swap any tokens using Uniswap V3... Automatically executes the transaction using your configured wallet
Attacks that exploit this kind of access
Swap any tokens using Uniswap V3. Can handle ETH, WETH, and any ERC-20 tokens. Automatically executes the transaction using your configured wallet. It is categorised as a Financial tool in the PortalMCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Portal MCP server in PolicyLayer and add a rule for eth_swap_tokens: 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 PortalMCP. Nothing to install.
eth_swap_tokens is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the eth_swap_tokens 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.
Set action: deny in the PolicyLayer policy for eth_swap_tokens. 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.
eth_swap_tokens is provided by the Portal MCP server (portalfnd/portalmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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