Where is the config file?

In Claude Desktop's settings under Developer → Edit Config; it opens claude_desktop_config.json for you.

Can I use the same wallet in Claude Code and Claude Desktop?

Yes. Both read the wallet the MCP server created under your home directory, so one balance serves both.

Add BlockRun to Claude Desktop with one MCP entry

One entry in claude_desktop_config.json gives Claude Desktop every BlockRun model, media generation and live data, paid per call in USDC over x402 with no API keys.

Get your agent on BlockRun Read the docs

How it works

Claude Desktop reads MCP servers from a JSON config file. Adding the BlockRun server there gives the desktop app the same tools Claude Code gets: chat with any model, image and video generation, search, prediction-market and on-chain data, and a wallet tool that shows the address, balance and a card onramp link.

The server runs locally under npx, creates its wallet under your home directory on first launch, and signs each x402 payment on your machine. Nothing about the wallet is sent to BlockRun except the signed authorization for the call being made.

Behind it is the BlockRun catalog: 78 chat models plus image, video, music and speech generation, search, market data and multi-chain RPC, priced per call. 6 open-weight models are free and need no wallet.

Setup

1. Add to claude_desktop_config.json

{
  "mcpServers": {
    "blockrun": { "command": "npx", "args": ["-y", "@blockrun/mcp@latest"] }
  }
}

2. Then restart Claude Desktop and say

Set up my BlockRun wallet

@blockrun/mcp on npm ↗

Questions

Where is the config file?: In Claude Desktop's settings under Developer → Edit Config; it opens claude_desktop_config.json for you.
Can I use the same wallet in Claude Code and Claude Desktop?: Yes. Both read the wallet the MCP server created under your home directory, so one balance serves both.