# AgentNDX
> A network registry for the agentic web. Find MCP servers, A2A agents, and x402-enabled services.

## What This Is
AgentNDX indexes tools that AI agents can connect to and use. MCP (Model Context Protocol) servers, A2A agents, and x402-enabled payment services. If you're an agent looking for a capability, search here. If you're a developer with a tool to list, submit at /submit.

## Base URL
https://agentndx.ai

## Machine-Readable Endpoints (Free)
- GET /api/servers.json — Full server index (JSON)
- GET /api/categories.json — All categories with counts
- GET /api/stats.json — Registry statistics

## Search Endpoint (x402 — $0.005 USDC)
- GET /api/search?q=... — Full-text search across 15K+ entries (Railway backend)
- Optional params: category=<slug>, protocols=MCP,A2A,x402, limit=<int>
- Returns 402 with payment instructions if unpaid

## MCP Endpoint
- POST /mcp — Full MCP server. Tools: search_servers, list_categories, get_server, get_stats
- x402 payment required for search_servers (full results). Free: list_categories, get_stats, get_server by ID.
- Price: $0.005 USDC per search query, Base mainnet

## Add to Claude Code
claude mcp add agentndx https://agentndx.ai/mcp

## Add to Claude Desktop (claude_desktop_config.json)
{
  "mcpServers": {
    "agentndx": {
      "url": "https://agentndx.ai/mcp"
    }
  }
}

## API Documentation
Full API docs at https://agentndx.ai/api

## Submit a Tool
https://agentndx.ai/submit

## Data Format
Each server entry includes: id, name, description, category, endpoint, protocols (MCP/A2A/x402/NLWeb), transport, auth, x402_price, tags, use_cases, health status.

## Categories
communication, data, web, code, ai, payments, identity, productivity, infrastructure, media

## Sitemap
https://agentndx.ai/sitemap-index.xml