Spend limits for AI agents that pay with x402: every paywall is policy-checked before a cent moves.
To add Rein to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 6 environment variables, listed below.
Install
npx -y @reinconsole/mcp@0.8.0Environment variables
REIN_AGENT_FILESet in your MCP configREIN_ENGINE_URLSet in your MCP configREIN_AGENT_IDSet in your MCP configREIN_ENGINE_API_KEYSet in your MCP configREIN_PAYER_PRIVATE_KEYSet in your MCP configREIN_NETWORK_PROFILESet in your MCP configInstall with your client
claude mcp add rein --env REIN_AGENT_FILE=<YOUR_REIN_AGENT_FILE> --env REIN_ENGINE_URL=<YOUR_REIN_ENGINE_URL> --env REIN_AGENT_ID=<YOUR_REIN_AGENT_ID> --env REIN_ENGINE_API_KEY=<YOUR_REIN_ENGINE_API_KEY> --env REIN_PAYER_PRIVATE_KEY=<YOUR_REIN_PAYER_PRIVATE_KEY> --env REIN_NETWORK_PROFILE=<YOUR_REIN_NETWORK_PROFILE> -- npx -y @reinconsole/mcp@0.8.0
Run this in a terminal to add the server to Claude Code.
What this does
Rein exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
REIN_AGENT_FILE REIN_ENGINE_URL REIN_AGENT_ID REIN_ENGINE_API_KEY REIN_PAYER_PRIVATE_KEY REIN_NETWORK_PROFILE
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install Rein?
Run the Claude Code command in the install section to add Rein to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with Rein?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to Rein as well.
Does Rein need an API key?
Yes. Before it can run, set these environment variables: REIN_AGENT_FILE, REIN_ENGINE_URL, REIN_AGENT_ID, REIN_ENGINE_API_KEY, REIN_PAYER_PRIVATE_KEY, REIN_NETWORK_PROFILE. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
Is this your MCP server?
Claim this listing to see its traffic, fix details yourself, and skip the review queue on future updates.
Add this badge to your README
Show visitors this server is listed in the ClaudeRules directory. The badge links straight to this listing.
[](https://clauderules.net/mcp/io-github-bugiiiii11-rein)<a href="https://clauderules.net/mcp/io-github-bugiiiii11-rein" target="_blank" rel="noopener noreferrer"><img src="https://clauderules.net/api/badge/io-github-bugiiiii11-rein" alt="Listed on clauderules.net" /></a>More AI MCP servers
GitHub
Connect AI assistants to GitHub - manage repos, issues, PRs, and workflows through natural language.
Serena MCP: the IDE for your agent
A powerful toolkit for coding, providing semantic retrieval and editing capabilities.
MCP Toolbox for Databases
MCP Toolbox for Databases enables your agent to connect to your database.
Figma-Context-MCP
Give your coding agent access to your Figma data. Implement designs in any framework in one-shot.