send_concurrent_payments

THE RISK

Critical Risk

Why send_concurrent_payments needs a policy

This tool explicitly sends multiple blockchain payments in parallel. It moves real funds (TIP-20 stablecoin tokens) on the Tempo blockchain. The server description confirms this enables 'autonomously execute real-world payments.' Misuse could result in mass unauthorized financial transfers simultaneously, making this critical severity Financial category.

From the tool's definition Send multiple TIP-20 payments in parallel using different nonce keys

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

POLICY

How to control send_concurrent_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 send_concurrent_payments:

policy.json

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

Any call to send_concurrent_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

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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_concurrent_payments

What does the send_concurrent_payments tool do? +

Send multiple TIP-20 payments in parallel using different nonce keys. 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_concurrent_payments? +

Register the Tempo MCP server in PolicyLayer and add a rule for send_concurrent_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 send_concurrent_payments? +

send_concurrent_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 send_concurrent_payments? +

Yes. Add a rate_limit block to the send_concurrent_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 send_concurrent_payments completely? +

Set action: deny in the PolicyLayer policy for send_concurrent_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 send_concurrent_payments? +

send_concurrent_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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