swap_estimate_price_impact

THE RISK

Low Risk

Why swap_estimate_price_impact needs a policy

This tool only estimates/calculates price impact without executing any transaction. It is a read-only query that returns informational data about potential market impact before a trade is made.

From the tool's definition Estimate the price impact for a given swap size... Helps users understand how their trade will move the market.

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

POLICY

How to control swap_estimate_price_impact

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_estimate_price_impact:

policy.json

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

swap_estimate_price_impact 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 →

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EXPLORE

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FAQ

Questions about swap_estimate_price_impact

What does the swap_estimate_price_impact tool do? +

Estimate the price impact for a given swap size. Helps users understand how their trade will move the market. 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_estimate_price_impact? +

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

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

Can I rate-limit swap_estimate_price_impact? +

Yes. Add a rate_limit block to the swap_estimate_price_impact 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_estimate_price_impact completely? +

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

swap_estimate_price_impact 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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