Rein

io.github.bugiiiii11/rein

Spend limits for AI agents that pay with x402: every paywall is policy-checked before a cent moves.

View repository →Homepage →

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": {
    "rein": {
      "command": "npx",
      "args": [
        "-y",
        "@reinconsole/mcp@0.8.0"
      ],
      "env": {
        "REIN_ENGINE_API_KEY": "<your REIN_ENGINE_API_KEY>",
        "REIN_PAYER_PRIVATE_KEY": "<your REIN_PAYER_PRIVATE_KEY>"
      }
    }
  }
}
Environment variables
  • REIN_ENGINE_API_KEYsecretBearer key for the engine, ideally an evaluate key narrowed to this agent.
  • REIN_PAYER_PRIVATE_KEYsecretAgent wallet key. Omit for advisory mode: policy is checked, nothing is paid.

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

Category
Developer Tools
Version
0.8.0
Registry
active
Published
10/18/2026

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Markdown — for your README

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