payment

THE RISK

Critical Risk

Why payment needs a policy

This tool moves XRP or tokens between accounts on the XRP Ledger, which constitutes a direct financial transaction. Payments on a blockchain are irreversible, making misuse potentially catastrophic. The blast radius is critical as an AI agent could drain funds from an account.

From the tool's definition "Send a payment from one account to another on the XRP Ledger"

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

POLICY

How to control payment

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

policy.json

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

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

Create a free account and register Xrpl 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

More Xrpl mcp tools

Financial amm-deposit Deposit assets into an existing Automated Market Maker (AMM) on the XRP Ledger Financial transfer-token Transfer tokens between addresses Financial transfer-xrp Transfer XRP between accounts using the connected wallet or a named wallet Financial check-cash Cash a Check to receive funds from it Financial amm-bid Place a bid on an Automated Market Maker Financial amm-clawback Clawback assets from an Automated Market Maker (AMM) Financial amm-create Create a new Automated Market Maker (AMM) on the XRP Ledger Financial approve-transaction Approve a pending transaction, signing and submitting it to the XRP Ledger. This is a dest

All 71 Xrpl mcp tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Xrpl 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 payment

What does the payment tool do? +

Send a payment from one account to another on the XRP Ledger. It is categorised as a Financial tool in the Xrpl mcp MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on payment? +

Register the Xrpl MCP server in PolicyLayer and add a rule for 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 Xrpl mcp. Nothing to install.

What risk level is payment? +

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 payment? +

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

Set action: deny in the PolicyLayer policy for 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 payment? +

payment is provided by the Xrpl MCP server (romthpt/mcp-xrpl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Xrpl mcp tool call.

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

CHECK YOUR STACK →