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Rein

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

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★ 0 stars Last pushed 2026-10-18 License: MIT

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Review any command before running it. Package names and URLs come from the server's own registry entry.

Package (npm 0.7.0)

npx -y @reinconsole/[email protected]

Or add to your MCP client config:

{
  "mcpServers": {
    "rein": {
      "command": "npx",
      "args": [
        "-y",
        "@reinconsole/[email protected]"
      ],
      "env": {
        "REIN_AGENT_FILE": "<YOUR_VALUE>",
        "REIN_ENGINE_URL": "<YOUR_VALUE>",
        "REIN_AGENT_ID": "<YOUR_VALUE>",
        "REIN_ENGINE_API_KEY": "<YOUR_VALUE>",
        "REIN_PAYER_PRIVATE_KEY": "<YOUR_VALUE>",
        "REIN_NETWORK_PROFILE": "<YOUR_VALUE>"
      }
    }
  }
}

REIN_AGENT_FILE — Path to the rein-agent.json written by `npx @reinconsole/init` (engine URL, agent id, API key, wallet).
REIN_ENGINE_URL — Policy engine base URL. Required unless REIN_AGENT_FILE is set.
REIN_AGENT_ID — The one agent this server speaks for. Required unless REIN_AGENT_FILE is set.
REIN_ENGINE_API_KEY secret — Bearer key for the engine, ideally an evaluate key narrowed to this agent.
REIN_PAYER_PRIVATE_KEY secret — Agent wallet key. Omit for advisory mode: policy is checked, nothing is paid.
REIN_NETWORK_PROFILE — testnet (default) or mainnet: which network's 402s this server will pay.