callx402 MCP Server: Install & Setup

Install callx402 in Claude Code

Claude Code

claude mcp add callx402 -- npx -y callx402

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "callx402": {
      "command": "npx",
      "args": [
        "-y",
        "callx402"
      ]
    }
  }
}

Read-only x402 payment diagnostics: diagnose, evidence, explain, recover, resolve, status. Zero deps

Probably not entirely. The listing mentions pay-per-call, credits or a subscription. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add callx402 -- npx -y callx402

joalbrecht/capitol-ledger-mcp

Read-only House stock disclosures and synthetic portfolio research. Approved pilot key required.

yolo-maxi/cabin

Search and book real flights with USDC on Base. 500+ airlines, crypto-native payments.

MayankTalwar0/carbon-footprint-mcp

An MCP server for calculating carbon footprints from bank statements using EPA GHG emission factors.

hiatys/businys-mcp

221 MCP tools across 26 practices for independent professionals. Clients, invoices, contracts.

pelazas/carrydesk

Funding-carry rankings for Hyperliquid perps, metered per call in USDC via x402.

aiindigo925/btcfi-api

Bitcoin data for AI agents. 27 tools with x402 micropayments. No API keys needed.