Self-custodial x402 wallet for AI agents: pay any service in USDC or $THREE from your own key.
To add x402 Wallet 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 @three-ws/x402-mcp@0.2.3Environment variables
SOLANA_SECRET_KEYSet in your MCP configSOLANA_RPC_URLSet in your MCP configMAX_PAY_USDSet in your MCP configREQUIRE_CONFIRMSet in your MCP configTHREE_WS_BASESet in your MCP configInstall with your client
claude mcp add x402-wallet --env SOLANA_SECRET_KEY=<YOUR_SOLANA_SECRET_KEY> --env SOLANA_RPC_URL=<YOUR_SOLANA_RPC_URL> --env MAX_PAY_USD=<YOUR_MAX_PAY_USD> --env REQUIRE_CONFIRM=<YOUR_REQUIRE_CONFIRM> --env THREE_WS_BASE=<YOUR_THREE_WS_BASE> -- npx -y @three-ws/x402-mcp@0.2.3
Run this in a terminal to add the server to Claude Code.
What this does
x402 Wallet 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:
SOLANA_SECRET_KEY SOLANA_RPC_URL MAX_PAY_USD REQUIRE_CONFIRM THREE_WS_BASE
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 Wallet?
Run the Claude Code command in the install section to add x402 Wallet 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 Wallet?
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 Wallet as well.
Does x402 Wallet need an API key?
Yes. Before it can run, set these environment variables: SOLANA_SECRET_KEY, SOLANA_RPC_URL, MAX_PAY_USD, REQUIRE_CONFIRM, THREE_WS_BASE. 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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