Risk-check counterparties before an AI agent pays; pay x402 resources only after a verified allow
To add x402check 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 5 environment variables, listed below.
Install
npx -y @x402check/mcp@0.3.3Environment variables
X402CHECK_CREDIT_TOKENSet in your MCP configX402CHECK_PAYER_KEYSet in your MCP configX402CHECK_BUDGET_USDSet in your MCP configX402CHECK_PINNED_KEYSSet in your MCP configX402CHECK_MAX_PAYMENT_USDSet in your MCP configInstall with your client
claude mcp add x402check --env X402CHECK_CREDIT_TOKEN=<YOUR_X402CHECK_CREDIT_TOKEN> --env X402CHECK_PAYER_KEY=<YOUR_X402CHECK_PAYER_KEY> --env X402CHECK_BUDGET_USD=<YOUR_X402CHECK_BUDGET_USD> --env X402CHECK_PINNED_KEYS=<YOUR_X402CHECK_PINNED_KEYS> --env X402CHECK_MAX_PAYMENT_USD=<YOUR_X402CHECK_MAX_PAYMENT_USD> -- npx -y @x402check/mcp@0.3.3
Run this in a terminal to add the server to Claude Code.
What this does
x402check 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:
X402CHECK_CREDIT_TOKEN X402CHECK_PAYER_KEY X402CHECK_BUDGET_USD X402CHECK_PINNED_KEYS X402CHECK_MAX_PAYMENT_USD
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install x402check?
Run the Claude Code command in the install section to add x402check 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 x402check?
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 x402check as well.
Does x402check need an API key?
Yes. Before it can run, set these environment variables: X402CHECK_CREDIT_TOKEN, X402CHECK_PAYER_KEY, X402CHECK_BUDGET_USD, X402CHECK_PINNED_KEYS, X402CHECK_MAX_PAYMENT_USD. 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-caiovicentino-x402check)<a href="https://clauderules.net/mcp/io-github-caiovicentino-x402check" target="_blank" rel="noopener noreferrer"><img src="https://clauderules.net/api/badge/io-github-caiovicentino-x402check" 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.