batch_payments

THE RISK

Critical Risk

Why batch_payments needs a policy

This tool executes real financial transactions by sending stablecoin payments on the Tempo blockchain. The batch/atomic nature amplifies the blast radius: a single misuse could drain funds to multiple addresses simultaneously with no reversal. This clearly falls under Financial, the most severe category, with critical severity due to the multiplied impact of batch execution.

From the tool's definition 'Send multiple TIP-20 stablecoin payments in a single atomic transaction' — directly moves stablecoin funds to multiple recipients in one operation

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

POLICY

How to control batch_payments

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 batch_payments:

policy.json

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

Any call to batch_payments 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.

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EXPLORE

Related tools and policies

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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 batch_payments

What does the batch_payments tool do? +

Send multiple TIP-20 stablecoin payments in a single atomic 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 batch_payments? +

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

batch_payments 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 batch_payments? +

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

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

batch_payments 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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