Build a signed MoonPay widget URL for an agent or user to complete the on-ramp in their browser. The signature binds wallet address + amount + currency so the params cannot be tampered with after generation.
AI agents use moonpay_sign_onramp_url to commit financial operations through Execution Market — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool generates a cryptographically signed URL that initiates a MoonPay on-ramp transaction, committing financial parameters (wallet address, amount, currency). While the user still completes the flow in a browser, the signing step binds the financial terms and enables a real-money purchase, placing it squarely in the Financial category.
From the tool's definition 'signed MoonPay widget URL for an agent or user to complete the on-ramp' and 'Gasless USDC payments via x402' — initiates a fiat-to-crypto on-ramp flow binding wallet address + amount + currency
Attacks that exploit this kind of access
Build a signed MoonPay widget URL for an agent or user to complete the on-ramp in their browser. The signature binds wallet address + amount + currency so the params cannot be tampered with after generation. It is categorised as a Financial tool in the Execution Market MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Execution Market MCP server in PolicyLayer and add a rule for moonpay_sign_onramp_url: 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 Execution Market. Nothing to install.
moonpay_sign_onramp_url 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 moonpay_sign_onramp_url 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 moonpay_sign_onramp_url. 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.
moonpay_sign_onramp_url is provided by the Execution Market MCP server (https://mcp.execution.market/mcp/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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