yield_reserve_get_swap_quote

THE RISK

Low Risk

Why yield_reserve_get_swap_quote needs a policy

This tool queries the Yield Reserve to obtain swap pricing information. It does not execute a swap, transfer tokens, or modify any state — it merely reads and returns quote data. Even in a financial DeFi context, retrieving a price quote is a read-only operation with no side effects or financial commitment.

From the tool's definition Tool name contains 'get' and description states 'Get a quote' — retrieves pricing information without executing any transaction or state change. The word 'quote' indicates it returns information only.

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

POLICY

How to control yield_reserve_get_swap_quote

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 yield_reserve_get_swap_quote:

policy.json

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

yield_reserve_get_swap_quote 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.
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Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about yield_reserve_get_swap_quote

What does the yield_reserve_get_swap_quote tool do? +

Get a quote for swapping tokens through the Yield Reserve. Uses protocol oracle prices for fair value swaps. 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 yield_reserve_get_swap_quote? +

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

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

Can I rate-limit yield_reserve_get_swap_quote? +

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

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

yield_reserve_get_swap_quote 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.

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