x402 Universal Payer MCP Server

What this does

x402 Universal Payer 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:

MCP_BRIDGE_EVM_PRIVATE_KEY
MCP_BRIDGE_SVM_PRIVATE_KEY
MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC
MCP_BRIDGE_MAX_TOTAL_ATOMIC
MCP_BRIDGE_ALLOWED_PAYTO
MCP_BRIDGE_ALLOWED_HOSTS
MCP_BRIDGE_ALLOW_HTTP
MCP_BRIDGE_DISCOVER_LIMIT
MCP_BRIDGE_BAZAAR_URL
MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER
MCP_BRIDGE_MAX_DEPOSIT_ATOMIC
X402_MCP_BRIDGE_CHANNELS_DIR
RPC_URL_8453

Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).

How do I install x402 Universal Payer?

Run the Claude Code command in the install section to add x402 Universal Payer 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 Universal Payer?

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 Universal Payer as well.

Does x402 Universal Payer need an API key?

Yes. Before it can run, set these environment variables: MCP_BRIDGE_EVM_PRIVATE_KEY, MCP_BRIDGE_SVM_PRIVATE_KEY, MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC, MCP_BRIDGE_MAX_TOTAL_ATOMIC, MCP_BRIDGE_ALLOWED_PAYTO, MCP_BRIDGE_ALLOWED_HOSTS, MCP_BRIDGE_ALLOW_HTTP, MCP_BRIDGE_DISCOVER_LIMIT, MCP_BRIDGE_BAZAAR_URL, MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER, MCP_BRIDGE_MAX_DEPOSIT_ATOMIC, X402_MCP_BRIDGE_CHANNELS_DIR, RPC_URL_8453. They go in the env block of your MCP config.