x402 Seller MCP Server
API key requiredPay-per-call MCP tools (crypto/DeFi data, web reading, AI tasks) in USDC over x402 on Base.
To add x402 Seller 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 2 environment variables, listed below.
Install
npx -y x402-seller-mcp@0.1.1Environment variables
BUYER_PRIVATE_KEYSet in your MCP configX402_ORIGINSet in your MCP configInstall with your client
claude mcp add x402-seller --env BUYER_PRIVATE_KEY=<YOUR_BUYER_PRIVATE_KEY> --env X402_ORIGIN=<YOUR_X402_ORIGIN> -- npx -y x402-seller-mcp@0.1.1
Run this in a terminal to add the server to Claude Code.
What this does
x402 Seller 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:
BUYER_PRIVATE_KEY X402_ORIGIN
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install x402 Seller?
Run the Claude Code command in the install section to add x402 Seller 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 x402 Seller?
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 x402 Seller as well.
Does x402 Seller need an API key?
Yes. Before it can run, set these environment variables: BUYER_PRIVATE_KEY, X402_ORIGIN. 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.
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