estimate_sponsored_gas

THE RISK

Low Risk

Why estimate_sponsored_gas needs a policy

This tool performs a read-only estimation of gas costs for a hypothetical TIP-20 transfer. It retrieves or calculates information without creating, modifying, deleting, or executing any actual transactions or state changes. The word 'estimate' confirms it is informational only.

From the tool's definition Tool name 'estimate_sponsored_gas' and description 'Estimate the gas cost' indicate a query/calculation operation with no state changes or side effects.

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

POLICY

How to control estimate_sponsored_gas

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

policy.json

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

estimate_sponsored_gas 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 Tempo — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

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FAQ

Questions about estimate_sponsored_gas

What does the estimate_sponsored_gas tool do? +

Estimate the gas cost that a sponsor would pay for a TIP-20 transfer. It is categorised as a Read tool in the Tempo MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on estimate_sponsored_gas? +

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

What risk level is estimate_sponsored_gas? +

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

Can I rate-limit estimate_sponsored_gas? +

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

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

estimate_sponsored_gas is provided by the Tempo MCP server (arome3/tempo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tempo tool call.

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

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