Set maximum amount willing to pay per request (in SOL). Set to 0 to remove limit.
AI agents use set-payment-limit to commit financial operations through AI42-MCP X402 Payment Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly configures financial spending limits denominated in SOL (Solana cryptocurrency). Modifying or removing payment limits governs how much real money can be spent per request via the X402 payment system. Misuse (e.g., setting limit to 0 to remove it, or setting an excessively high limit) could result in unbounded financial expenditure, making this a Financial category tool with high severity.
From the tool's definition Set maximum amount willing to pay per request (in SOL). Set to 0 to remove limit.
Attacks that exploit this kind of access
Set maximum amount willing to pay per request (in SOL). Set to 0 to remove limit. It is categorised as a Financial tool in the AI42-MCP X402 Payment Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the AI42-MCP X402 Payment Server MCP server in PolicyLayer and add a rule for set-payment-limit: 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 AI42-MCP X402 Payment Server. Nothing to install.
set-payment-limit 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 set-payment-limit 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 set-payment-limit. 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.
set-payment-limit is provided by the AI42-MCP X402 Payment Server MCP server (kishore-mk/ai42-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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