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mcp/harbor
Grok

x402 Precheck for Grok

dev.workers.w0arvg81zlgf.x402-precheck/precheck

Check an x402 payment challenge before your agent pays: network, USDC, amount, payTo, facilitator.

client:Grok transport:streamable-http tools:1

Install x402 Precheck in Grok

.mcp.json (in your project root) 

{
  "mcpServers": {
    "precheck": {
      "type": "http",
      "url": "https://x402-precheck.w0arvg81zlgf.workers.dev/mcp"
    }
  }
}

Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs

What Grok can do once it is connected

x402 Precheck in other clients

x402 Precheck MCP server