Circle Agent Stack MCP Server

by kinanceio.github.kinance/circle-agent-stack-mcpv0.1.1

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

1Node.jsstdioofficial registry

context tax

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security

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cold start

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freshness

Slowing4mo ago

Install Circle Agent Stack MCP server

claude mcp add circle-agent-stack -e CIRCLE_API_KEY='<circle-api-key>' -- npx -y circle-agent-stack-mcp

{
  "mcpServers": {
    "circle-agent-stack": {
      "command": "npx",
      "args": [
        "-y",
        "circle-agent-stack-mcp"
      ],
      "env": {
        "CIRCLE_API_KEY": "<circle-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "circle-agent-stack": {
      "command": "npx",
      "args": [
        "-y",
        "circle-agent-stack-mcp"
      ],
      "env": {
        "CIRCLE_API_KEY": "<circle-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "circle-agent-stack": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "circle-agent-stack-mcp"
      ],
      "env": {
        "CIRCLE_API_KEY": "<circle-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "circle-agent-stack": {
      "command": "npx",
      "args": [
        "-y",
        "circle-agent-stack-mcp"
      ],
      "env": {
        "CIRCLE_API_KEY": "<circle-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
CIRCLE_API_KEY	yes	yes	Your Circle API key from developers.circle.com

Freshness

Slowing — last maintenance signal 4mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-06-04 · 4mo ago · GitHub
Latest release
2026-06-04 · 4mo ago · GitHub · v0.1.3
Package published
no data · npm/PyPI
Registry entry updated
2026-05-31 · 4mo ago · official registry · v0.1.1

FAQ

›How do I install the Circle Agent Stack MCP server in Claude Code?

Run: claude mcp add circle-agent-stack -e CIRCLE_API_KEY='<circle-api-key>' -- npx -y circle-agent-stack-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Circle Agent Stack require an API key?

Yes. It expects CIRCLE_API_KEY, of which 1 is a secret.

›Can I use Circle Agent Stack as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Circle Agent Stack in the official MCP registry?

Yes, as io.github.kinance/circle-agent-stack-mcp.