Set a spend cap on your wallet. Once the daily or monthly USDC limit is reached, further paid API calls return 429 before payment is attempted. Set limits to null to remove a cap.
AI agents use wallet_set_cap to commit financial operations through APIMesh MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly modifies financial controls on a cryptocurrency (USDC) wallet, governing how much money can be spent on pay-per-call API services. Misuse could remove spending caps entirely (setting limits to null), allowing unlimited financial expenditure.
From the tool's definition 'Set a spend cap on your wallet', 'daily or monthly USDC limit', 'Set limits to null to remove a cap'
Attacks that exploit this kind of access
Set a spend cap on your wallet. Once the daily or monthly USDC limit is reached, further paid API calls return 429 before payment is attempted. Set limits to null to remove a cap. It is categorised as a Financial tool in the APIMesh MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the APIMesh MCP Server MCP server in PolicyLayer and add a rule for wallet_set_cap: 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 APIMesh MCP Server. Nothing to install.
wallet_set_cap 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 wallet_set_cap 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 wallet_set_cap. 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.
wallet_set_cap is provided by the APIMesh MCP Server MCP server (mbeato/apimesh). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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