x402_balance

SERVERX402 Buyer SOURCE8randonpickart5/x402-buyer-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/8randonpickart5-x402-buyer-mcp/x402-balance.md

WHAT IT DOES

What x402_balance does on X402 Buyer

AI agents call x402_balance to retrieve information from X402 Buyer without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why x402_balance is rated Low

This tool only reads and returns the current wallet balance. It performs no writes, executions, or financial transactions — it is a pure read/query operation with no side effects.

From the tool's definition Check your AgentCash USDC wallet balance on Base... Returns current balance available for x402 payments... No parameters required.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs x402_balance safely

PolicyLayer is an MCP gateway: it sits between your AI agents and X402 Buyer, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For x402_balance, this is the rule to start with:

x402_balance Allowed

x402_balance is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "x402_balance": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect X402 Buyer, apply this rule, and every x402_balance call is checked against it from then on.

FAQ

Questions about x402_balance

What does the x402_balance tool do? +

Check your AgentCash USDC wallet balance on Base. Returns current balance available for x402 payments and approximate number of calls you can afford. No parameters required. If AgentCash is not set up, provides instructions to create and fund a wallet. It is categorised as a Read tool in the X402 Buyer MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on x402_balance? +

Register the X402 Buyer MCP server in PolicyLayer and add a rule for x402_balance: 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 X402 Buyer. Nothing to install.

What risk level is x402_balance? +

x402_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit x402_balance? +

Yes. Add a rate_limit block to the x402_balance 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 x402_balance completely? +

Set action: deny in the PolicyLayer policy for x402_balance. 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 x402_balance? +

x402_balance is provided by the X402 Buyer MCP server (8randonpickart5/x402-buyer-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on X402 Buyer, and thousands of servers like it.

This server

All 4 X402 Buyer tools →

Across the catalogue

The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →