# 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.

## What This Is

AgentNDX is a curated directory of 143+ Model Context Protocol (MCP) servers, A2A agents, and x402-payable services. Every entry is verified, schema-normalized, and machine-readable. Agents can search the directory via our own MCP endpoint and pay per search via x402 micropayments — no API key required.

## Base URL

https://agentndx.ai

## Machine-Readable Endpoints (Free)

- GET /api/servers.json — Full server index (JSON, all 137+ entries)
- GET /api/categories.json — All categories with counts
- GET /api/stats.json — Registry statistics (total, MCP, A2A, x402, verified counts)

## MCP Endpoint

The AgentNDX directory is itself an MCP server. Agents can call it to discover other agents.

- **URL:** https://agentndx.ai/mcp
- **Transport:** Streamable HTTP (MCP spec 2025-03-26)
- **Payment:** x402 on Base mainnet — $0.005 USDC per search (search tool only)
- **Auth:** None — x402 handles authorization at call time
- **Free tools:** get_server_details, list_categories, get_stats

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

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

## Tools

### search_mcp_servers
Search 143+ 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:
- `id` (string) — server ID from search results

### list_categories
List all categories with server counts. Free.

### get_stats
Registry statistics: total servers, protocol counts, verified count. Free.

## Categories

- **communication** (10) — Slack, Discord, Twilio, Resend, SendGrid, Zendesk, Gmail, Teams, Mailchimp, Intercom
- **data** (17) — PostgreSQL, Supabase, MongoDB, Redis, Neon, HubSpot, Salesforce, Shopify, Mapbox, OpenWeather, Filesystem, Memory, AgentNDX, Snowflake, Elasticsearch, Airtable, Pinecone
- **web** (11) — Playwright, Firecrawl, Fetch, Exa, Brave Search, Tavily, Google Maps, AWS Docs, Algolia, Contentful, Sanity
- **code** (9) — GitHub, GitLab, Sentry, Semgrep, CircleCI, Terraform, Confluence, Nx, Bitbucket
- **ai** (12) — Context7, Sequential Thinking, Qdrant, Replicate, Perplexity, Mem0, OpenAI, Groq, HuggingFace, Cohere, Mistral, Anthropic
- **payments** (5) — Stripe, PayPal, Coinbase AgentKit, Square, Lemon Squeezy
- **identity** (5) — 1Password, HashiCorp Vault, Auth0, Okta, AWS Secrets Manager
- **productivity** (12) — Notion, Linear, Google Drive, Jira, Cal.com, Asana, Figma, Monday, Todoist, Calendly, Typeform, Trello
- **infrastructure** (9) — Cloudflare, Docker, AWS, Kubernetes, Vercel, Datadog, Grafana, PagerDuty, Render
- **media** (7) — Cloudinary, Unsplash, YouTube, ElevenLabs, fal.ai, Stability AI, Deepgram

## Data Format

Each server entry includes:
- id, name, description, category
- endpoint (install_cmd for stdio servers, URL for remote)
- protocols: MCP | A2A | x402 | NLWeb
- transport: stdio | http | sse
- auth: none | api-key | oauth | x402
- tags (4-6), use_cases (3), related_ids
- verified (bool), health: active | unknown | inactive
- added, updated (ISO dates)

## Submit a Tool

https://agentndx.ai/submit

## Full Server List

https://agentndx.ai/llms-full.txt

## Sitemap

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