Create an invoice for another agent or human to pay. Returns payment URL, address, and QR code. Payment is detected automatically via ZeroMQ (<3 seconds).
AI agents use create_invoice to commit financial operations through MERX - TRON Resource Exchange — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool initiates a financial transaction request by creating a payment invoice. It directly involves financial obligations — requesting payment from another party — which places it firmly in the Financial category. Misuse could lead to fraudulent invoices being sent to agents or humans, resulting in unauthorized financial transfers.
From the tool's definition 'Create an invoice for another agent or human to pay' and 'Returns payment URL, address, and QR code. Payment is detected automatically via ZeroMQ'
Attacks that exploit this kind of access
Create an invoice for another agent or human to pay. Returns payment URL, address, and QR code. Payment is detected automatically via ZeroMQ (<3 seconds). It is categorised as a Financial tool in the MERX - TRON Resource Exchange MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the MERX - TRON Resource Exchange MCP server in PolicyLayer and add a rule for create_invoice: 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 MERX - TRON Resource Exchange. Nothing to install.
create_invoice is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the create_invoice 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.
Set action: deny in the PolicyLayer policy for create_invoice. 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.
create_invoice is provided by the MERX - TRON Resource Exchange MCP server (Hovsteder/merx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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