Circle Agent Stack MCP Server: Install & Setup

Install Circle Agent Stack in Claude Code

Claude Code

claude mcp add circle-agent-stack -e CIRCLE_API_KEY=... -- npx -y circle-agent-stack-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "circle-agent-stack": {
      "command": "npx",
      "args": [
        "-y",
        "circle-agent-stack-mcp"
      ],
      "env": {
        "CIRCLE_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Circle Agent Stack MCP server do?

Circle Agent Stack via the Circle CLI: create USDC wallets, set spend policies, send stablecoins and pay x402-gated endpoints.

Is the Circle Agent Stack MCP server free?

Probably not entirely. The listing mentions pay-per-call, credits or a subscription. Check the provider for current pricing.

Does Circle Agent Stack run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Circle Agent Stack to Claude Code?

Run: claude mcp add circle-agent-stack -e CIRCLE_API_KEY=... -- npx -y circle-agent-stack-mcp

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