swap_stablecoins

THE RISK

Critical Risk

Why swap_stablecoins needs a policy

This tool executes a financial transaction (swap) on a decentralized exchange involving stablecoins. Swaps commit real financial value and are largely irreversible once executed on-chain. The server context of real-world payments and the presence of sibling tools like batch_payments and burn_tokens confirm this is a high-stakes financial operation environment.

From the tool's definition "Execute a stablecoin swap on Tempo DEX" and server description "enabling AI agents to autonomously execute real-world payments"

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

POLICY

How to control swap_stablecoins

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 swap_stablecoins:

policy.json

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

Any call to swap_stablecoins 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

More Tempo tools

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All 61 Tempo tools →

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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 swap_stablecoins

What does the swap_stablecoins tool do? +

Execute a stablecoin swap on Tempo DEX. 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 swap_stablecoins? +

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

swap_stablecoins 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 swap_stablecoins? +

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

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

swap_stablecoins 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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