io.github.halowerk/halowerk-mcp

134 paid APIs as MCP tools, billed per call in USDC on Base. No account, no login.

Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "halowerk-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "halowerk-mcp@0.1.1"
      ],
      "env": {
        "HALOWERK_PRIVATE_KEY": "<your HALOWERK_PRIVATE_KEY>",
        "HALOWERK_MAX_PREIS_USDC": "0.05",
        "HALOWERK_BUDGET_USDC": "1.00",
        "HALOWERK_MODUS": "hero"
      }
    }
  }
}

Environment variables

HALOWERK_PRIVATE_KEYsecretPrivate key of the paying wallet, hex with or without 0x. Use a throwaway wallet holding only a few dollars of USDC on Base. Without it, only the free catalogue and price tools work.
HALOWERK_MAX_PREIS_USDCCeiling per call in USDC. A more expensive service is refused, not bought. Default 0.05.
HALOWERK_BUDGET_USDCCeiling per session in USDC. Once reached the server refuses further paid calls. Default 1.00.
HALOWERK_MODUShero (12 curated services, default), gateway (3 meta-tools, smallest context) or all (70 services).

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category: Developer Tools
Version: 0.1.1
Registry: active
Published: 8/12/2026

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