swap_get_best_route

THE RISK

Low Risk

Why swap_get_best_route needs a policy

This tool only queries and compares routing information across DEXs to find the best price. It retrieves route data without executing any swap or financial transaction. No side effects are indicated.

From the tool's definition Find the optimal swap route... Compares Camelot, SushiSwap, and Uniswap V3

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

POLICY

How to control swap_get_best_route

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 swap_get_best_route:

policy.json

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

swap_get_best_route 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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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 →
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FAQ

Questions about swap_get_best_route

What does the swap_get_best_route tool do? +

Find the optimal swap route across all DEXs for the best execution price. Compares Camelot, SushiSwap, and Uniswap V3. 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 swap_get_best_route? +

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

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

Can I rate-limit swap_get_best_route? +

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

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

swap_get_best_route 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 →