Plug InFor developers

Wire your LLM into the agent

● MCP endpoint · drop-in config for Claude / Cursor / OpenAI

MCP endpoint

https://pay-on-arc.vercel.app/mcp

Server launching with Vercel deploy · stub for now

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (Mac) or %APPDATA%/Claude/claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "arc-agent": {
      "url": "https://pay-on-arc.vercel.app/mcp",
      "transport": "sse"
    }
  }
}

Cursor

In Cursor Settings → MCP, add a new server:

{
  "mcpServers": {
    "arc-agent": {
      "url": "https://pay-on-arc.vercel.app/mcp"
    }
  }
}

OpenAI / generic function-calling

Or expose the agent directly as a tool to any LLM with function calling:

{
  "type": "function",
  "function": {
    "name": "pay",
    "description": "Send USDC from the agent's wallet to a recipient on Arc.",
    "parameters": {
      "type": "object",
      "properties": {
        "to":     { "type": "string", "description": "Recipient address (0x…)" },
        "amount": { "type": "number", "description": "USDC amount (max 1.00)" },
        "memo":   { "type": "string", "description": "Optional reason" }
      },
      "required": ["to", "amount"]
    }
  }
}

What the agent will accept

Any payment instruction within the rules on the Constitution. Outside the rules, the agent rejects with a structured error the LLM can read and try again with adjusted parameters.