Check the USDC balance for your agent wallet (or any address). If X-Coal-Agent-Key is set in your Claude config header, this auto-resolves your wallet's address. Otherwise pass address or agentPrivateKey. The server holds NO long-lived keys — every payment is signed per-request.
Risk signalsBulk/mass operation — affects multiple targets
Part of the Coal — Payments for AI agents server.
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AI agents call agent_wallet_status to retrieve information from Coal — Payments for AI agents without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though agent_wallet_status only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"agent_wallet_status": {}
}
}See the full Coal — Payments for AI agents policy for all 13 tools.
These attack patterns abuse exactly the kind of access agent_wallet_status gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Check the USDC balance for your agent wallet (or any address). If X-Coal-Agent-Key is set in your Claude config header, this auto-resolves your wallet's address. Otherwise pass address or agentPrivateKey. The server holds NO long-lived keys — every payment is signed per-request.. It is categorised as a Read tool in the Coal — Payments for AI agents MCP Server, which means it retrieves data without modifying state.
Register the Coal — Payments for AI agents MCP server in PolicyLayer and add a rule for agent_wallet_status: 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 Coal — Payments for AI agents. Nothing to install.
agent_wallet_status is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the agent_wallet_status 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 agent_wallet_status. 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.
agent_wallet_status is provided by the Coal — Payments for AI agents MCP server (https://mcp.usecoal.xyz/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Coal — Payments for AI agents tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.