stellar_payment

THE RISK

Critical Risk

Why stellar_payment needs a policy

This tool moves funds between accounts on the Stellar network, which is a direct financial transaction. Misuse could result in irreversible transfer of assets to unintended recipients, making it critical severity.

From the tool's definition "Send a payment to another account"

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

POLICY

How to control stellar_payment

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

policy.json

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

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

Create a free account and register Stellar MCP — 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

Related tools and policies

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All 12 Stellar MCP tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Stellar MCP → 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 →

FAQ

Questions about stellar_payment

What does the stellar_payment tool do? +

Send a payment to another account. It is categorised as a Financial tool in the Stellar MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on stellar_payment? +

Register the Stellar MCP server in PolicyLayer and add a rule for stellar_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 Stellar MCP. Nothing to install.

What risk level is stellar_payment? +

stellar_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 stellar_payment? +

Yes. Add a rate_limit block to the stellar_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 stellar_payment completely? +

Set action: deny in the PolicyLayer policy for stellar_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 stellar_payment? +

stellar_payment is provided by the Stellar MCP server (syronlabs/stellar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Stellar MCP tool call.

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

CHECK YOUR STACK →