Check the prepaid x402 credit balance for a wallet address. SIWX-ONLY: this endpoint rejects API key auth and requires X-Sign-In-With-X (forwarded from VENICE_SIWX_TOKEN). The wallet in the path must match the SIWX-authenticated wallet.
AI agents call venice_x402_balance to retrieve information from Venice MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves account balance information for an authenticated user's wallet. While it involves financial data (credit balance), the operation itself is purely informational and does not move money, commit financial obligations, or modify any state. The authentication requirement (SIWX token matching wallet address) ensures access control.
From the tool's definition Tool description states 'Check the prepaid x402 credit balance' — a retrieval operation with no modification or side effects. The 'Check' verb and 'balance' query are read-only operations.
Documented attack patterns abuse exactly the kind of access venice_x402_balance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Venice MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for venice_x402_balance:
{
"version": "1",
"default": "deny",
"tools": {
"venice_x402_balance": {}
}
}venice_x402_balance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check the prepaid x402 credit balance for a wallet address. SIWX-ONLY: this endpoint rejects API key auth and requires X-Sign-In-With-X (forwarded from VENICE_SIWX_TOKEN). The wallet in the path must match the SIWX-authenticated wallet. It is categorised as a Read tool in the Venice MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Venice MCP Server MCP server in PolicyLayer and add a rule for venice_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 Venice MCP Server. Nothing to install.
venice_x402_balance 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 venice_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.
Set action: deny in the PolicyLayer policy for venice_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.
venice_x402_balance is provided by the Venice MCP Server MCP server (veniceai/venice-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 27 Venice MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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27 Venice MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.