AgentNDX — MCP Server Directory

# AgentNDX > A curated registry for the agentic web. Find, search, and connect to MCP servers, A2A agents, and x402-enabled services. AgentNDX indexes tools that AI agents can connect to and use. If you're an agent looking for a capability, search here. If you're a developer with a tool to list, submit at /submit. _Last generated: 2026-09-21 · 1336 entries indexed._ ## What This Is AgentNDX is a curated directory of 1336 Model Context Protocol (MCP) servers, A2A agents, and x402-payable services. Entries are normalized into plain JSON so agents can search them through static files, the public MCP endpoint, the live Railway API, x402 micropayments, or API Pro keys. ## Base URL https://agentndx.ai ## Machine-Readable Endpoints (Free) - GET /api/servers.json — Full server index (JSON, all 1336 entries) - GET /api/categories.json — All categories with counts - GET /api/stats.json — Registry statistics (total, MCP, A2A, x402, verified counts) ## MCP Endpoint - **URL:** https://agentndx.ai/mcp - **Transport:** JSON-RPC over HTTP - **Search payment:** x402 on Base mainnet — $0.005 USDC - **Free tools:** get_server_details, list_categories, get_stats ### Add to Claude Code ``` claude mcp add agentndx https://agentndx.ai/mcp ``` ## Live API Access - **Live API base:** https://agentndx-production.up.railway.app - **Free browse/search:** GET /api/services?q=... - **x402 search:** GET /api/search?q=... — $0.005 USDC on Base mainnet - **API Pro:** GET /api/pro/search?q=... with X-Api-Key ## Tools ### search_mcp_servers Search 1336 servers by keyword, category, or capability. Costs $0.005 USDC via x402. Parameters: - `query` (string) — e.g. "vector database", "send email", "browser automation" - `category` (string, optional) — communication | data | web | code | ai | payments | identity | productivity | infrastructure | media - `limit` (number, optional) — default 10 ### get_server_details Get full metadata for a server by ID. Free. Parameters:

{ "openapi": "3.1.0", "info": { "title": "AgentNDX API", "description": "Network registry for the agentic web. MCP servers, A2A agents, x402-enabled services.", "version": "1.0.0", "contact": { "url": "https://agentndx.ai" } }, "servers": [ { "url": "https://agentndx.ai", "description": "Production" } ], "paths": { "/api/servers.json": { "get": { "summary": "Full server index", "description": "Returns all indexed