estimatePriorityFee

THE RISK

Low Risk

Why estimatePriorityFee needs a policy

This tool only estimates/calculates a fee value - it retrieves information without executing any transaction or modifying state. It's a read/query operation that returns fee data to inform decision-making.

From the tool's definition Estimate priority fee for a transaction involving specific accounts

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

POLICY

How to control estimatePriorityFee

PolicyLayer is an MCP gateway — it sits between your AI agents and Boosty MCP DeFi Platform, and nothing reaches the server without passing your rules. This is the rule we recommend for estimatePriorityFee:

policy.json

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

estimatePriorityFee 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 Boosty MCP DeFi Platform — 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 estimatePriorityFee

What does the estimatePriorityFee tool do? +

Estimate priority fee for a transaction involving specific accounts. It is categorised as a Read tool in the Boosty MCP DeFi Platform MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on estimatePriorityFee? +

Register the Boosty MCP DeFi Platform MCP server in PolicyLayer and add a rule for estimatePriorityFee: 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 Boosty MCP DeFi Platform. Nothing to install.

What risk level is estimatePriorityFee? +

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

Can I rate-limit estimatePriorityFee? +

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

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

estimatePriorityFee is provided by the Boosty MCP DeFi Platform MCP server (nirholas/boosty). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Boosty MCP DeFi Platform tool call.

Start from Boosty MCP DeFi Platform, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →