What is AgentNDX?
AgentNDX is a registry for AI tools — MCP servers, A2A agents, and x402-enabled APIs that AI assistants connect to when they need to do something: search the web, process a payment, query a database, send a message. Think of it as a phonebook for the agentic layer of the internet.
Browsing and discovering MCP servers
If you're building an AI setup — or just curious about what tools exist in the MCP ecosystem — browse and search the directory for free. No wallet, no login required.
Every server in the directory has a quality score based on how complete its metadata is — description, category, tools, and source URL. Use filters to narrow by category, protocol (MCP, A2A, x402), or source registry.
Programmatic access via x402
Agents and developers who need high-volume, programmatic directory access can query via the x402 API. Pay per query in USDC on Base mainnet — no account or API key needed.
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/api/search— FTS5 search across 52K+ servers · $0.005/query - —
/api/analyze/:id— deep service analysis with duplicates + peers · $0.05/query - —
/api/trending— ecosystem trends + category breakdown · $0.10/query - —
/api/services— free browse + keyword search · no payment
Your server is probably already listed
AgentNDX indexes from five source registries: Smithery, official MCP repos, GitHub, Bazaar, and A2A. If you've published an MCP server anywhere in the ecosystem, it's likely already here.
Claiming is free. It records you as the verified owner and puts you first in line for analytics, the verified badge, and description control as those features roll out.
Claim your listing →