ugf_x402_build_typed_data

WHAT IT DOES

What ugf_x402_build_typed_data does on Universal Gas Framework MCP Server

AI agents invoke ugf_x402_build_typed_data to trigger actions in Universal Gas Framework MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why ugf_x402_build_typed_data needs a policy

This tool constructs a cryptographic payment authorization payload (ERC-3009 is a token transfer authorization standard). While it doesn't directly move funds, it produces the structured data that, when signed and submitted, authorizes cross-chain token transfers. It is a critical step in a financial transaction pipeline — misuse could lead to signing unintended payment authorizations.

From the tool's definition Build ERC-3009 x402 typed-data payload for local signing... Agent signs with signTypedData, then calls ugf_x402_submit_signed

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ugf_x402_build_typed_data Rate-limited

ugf_x402_build_typed_data stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ugf_x402_build_typed_data": {
      "limits": [
        {
          "counter": "ugf_x402_build_typed_data_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Universal Gas Framework MCP Server, so you can run agents against it safely.

FAQ

Questions about ugf_x402_build_typed_data

What does the ugf_x402_build_typed_data tool do? +

Build ERC-3009 x402 typed-data payload for local signing. Returns {domain, types, message, nonce, valid_after, valid_before}. Agent signs with signTypedData, then calls ugf_x402_submit_signed. It is categorised as a Execute tool in the Universal Gas Framework MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ugf_x402_build_typed_data? +

Register the Universal Gas Framework MCP Server MCP server in PolicyLayer and add a rule for ugf_x402_build_typed_data: 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 Universal Gas Framework MCP Server. Nothing to install.

What risk level is ugf_x402_build_typed_data? +

ugf_x402_build_typed_data is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit ugf_x402_build_typed_data? +

Yes. Add a rate_limit block to the ugf_x402_build_typed_data 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 ugf_x402_build_typed_data completely? +

Set action: deny in the PolicyLayer policy for ugf_x402_build_typed_data. 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 ugf_x402_build_typed_data? +

ugf_x402_build_typed_data is provided by the Universal Gas Framework MCP Server MCP server (tychiwallet/ugf-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.