Underindex API MCP Server: Install & Setup

Install Underindex API in Claude Code

Claude Code

claude mcp add underindex-api -- npx -y underindex-mcp

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

{
  "mcpServers": {
    "underindex-api": {
      "command": "npx",
      "args": [
        "-y",
        "underindex-mcp"
      ]
    }
  }
}

Verified records on 60 niche fashion subcultures for AI agents, $0.01 per lookup over x402

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 underindex-api -- npx -y underindex-mcp

m9labs-railscope/verantis-mcp

Verified directory for machine payments (x402 & MPP): check services and wallets before agents pay.

SurfEther/trustsourcex402

x402-paid domain verification for AI agents — trustscore, SSL, security headers, robots.

agente-dev/wfirma-mcp

Unofficial read-only MCP server for the wFirma API v2: invoices, contractors, expenses, payments.

transparentpt/mcp

Budget used cars in Portugal: fair-price check, running-cost (IUC) estimate, stock search, contact.

theYahia/yookassa-mcp

MCP server for YooKassa payment API — payments, refunds, receipts (54-FZ). 10 tools. First MCP for

terradeed/terradeed-mcp-server

TerraDeed MCP server — x402 web scraping & structured extraction. Pay-per-call with USDC on Base.