send_sponsored_payment

THE RISK

Critical Risk

Why send_sponsored_payment needs a policy

This tool executes a blockchain payment transaction, transferring stablecoin value on the Tempo blockchain. It directly moves financial assets between parties, which qualifies as Financial — the highest severity category. The 'gasless' aspect means an AI agent could trigger real-world payments without even needing gas funds, lowering the barrier to misuse.

From the tool's definition Send a TIP-20 payment with gas fees paid by a sponsor (gasless transaction)

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

POLICY

How to control send_sponsored_payment

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 send_sponsored_payment:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_sponsored_payment": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to send_sponsored_payment is blocked until a human approves it. The rest of the server keeps working.

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.

GATE THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Govern MCP payment tools → Approval gates, spend caps, and per-identity scopes on every refund, payout, and charge your agents make.
Critical-risk tools in Tempo → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about send_sponsored_payment

What does the send_sponsored_payment tool do? +

Send a TIP-20 payment with gas fees paid by a sponsor (gasless transaction). It is categorised as a Financial tool in the Tempo MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on send_sponsored_payment? +

Register the Tempo MCP server in PolicyLayer and add a rule for send_sponsored_payment: 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 send_sponsored_payment? +

send_sponsored_payment is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit send_sponsored_payment? +

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

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

send_sponsored_payment 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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