get_swap_offers · Zerion MCP: Risk & Policy

WHAT IT DOES

What get_swap_offers does on Zerion

AI agents invoke get_swap_offers to trigger actions in Zerion. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why get_swap_offers needs a policy

This tool retrieves swap/bridge quotes AND provides 'ready-to-sign tx data', meaning it prepares executable transaction payloads that, if signed and broadcast, would perform token swaps involving financial value transfer. While the tool itself appears to be a read/quote operation, it produces ready-to-sign transaction data that directly enables financial transactions including a 0.8% fee.

From the tool's definition 'Get swap/bridge quotes with ready-to-sign tx data from aggregated providers (1inch, ParaSwap, 0x). Includes 0.8% Zerion fee.'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

get_swap_offers Rate-limited

get_swap_offers stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_swap_offers": {
      "limits": [
        {
          "counter": "get_swap_offers_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Zerion, so you can run agents against it safely.

FAQ

Questions about get_swap_offers

What does the get_swap_offers tool do? +

Get swap/bridge quotes with ready-to-sign tx data from aggregated providers (1inch, ParaSwap, 0x). Includes 0.8% Zerion fee. Use 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for native assets (ETH, MATIC etc.). It is categorised as a Execute tool in the Zerion MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on get_swap_offers? +

Register the Zerion MCP server in PolicyLayer and add a rule for get_swap_offers: 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 Zerion. Nothing to install.

What risk level is get_swap_offers? +

get_swap_offers is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit get_swap_offers? +

Yes. Add a rate_limit block to the get_swap_offers 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_swap_offers completely? +

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

get_swap_offers is provided by the Zerion MCP server (rockyale/zerion-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.