What is an x402 MCP server?

An MCP server that exposes x402-payable APIs as tools for an AI agent. @2sio/mcp turns every 2s endpoint into an MCP tool and pays per call from your wallet, so the agent needs no per-API keys.

How do I add it to Claude Desktop?

Add a "2sio" entry to mcpServers in claude_desktop_config.json with command npx and args ["-y", "@2sio/mcp"], plus your EVM_PRIVATE_KEY in env. Restart the host and the tools appear.

Can the agent try tools for free?

Yes. Run npx -y @2sio/mcp --trial (or set TWOS_TRIAL=1) and each tool can make one free real call per hour before you fund a wallet.

x402 MCP server: give your agent paid tools

The @2sio/mcp server exposes every 2s endpoint as a Model Context Protocol tool. Point Claude Desktop (or any MCP host) at it and your agent can call real APIs and pay per call — no per-tool API keys.

Add the server to your MCP host

Drop this into your MCP host config (Claude Desktop shown). The wallet key funds x402 payments; each endpoint becomes a callable tool:

MCP configjson

// Add @2sio/mcp to any MCP host (Claude Desktop shown). Every 2s endpoint
// becomes a tool the model can call; payments settle per call from your wallet.
{
  "mcpServers": {
    "2sio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": { "EVM_PRIVATE_KEY": "0x..." }
    }
  }
}

Try it free

Run the server in trial mode to let the agent make free real calls (one per endpoint per hour) before you fund a wallet:

MCP — trial modebash

npx -y @2sio/mcp --trial   # or set TWOS_TRIAL=1

What the agent gets

Every endpoint in the catalog shows up as a tool with a typed input schema, so the model knows when and how to call it — weather, patents, sanctions screening, SEC filings, CVEs, geocoding, and the rest. Payment happens automatically per call; you stay in control of the wallet.

Call a live x402 API right now — no signup.

Browse the full endpoint directory, grab the quickstart, or read the llms.txt manifest. Every endpoint is keyless and pay-per-call.

FAQ

What is an x402 MCP server?: An MCP server that exposes x402-payable APIs as tools for an AI agent. @2sio/mcp turns every 2s endpoint into an MCP tool and pays per call from your wallet, so the agent needs no per-API keys.
How do I add it to Claude Desktop?: Add a "2sio" entry to mcpServers in claude_desktop_config.json with command npx and args ["-y", "@2sio/mcp"], plus your EVM_PRIVATE_KEY in env. Restart the host and the tools appear.
Can the agent try tools for free?: Yes. Run npx -y @2sio/mcp --trial (or set TWOS_TRIAL=1) and each tool can make one free real call per hour before you fund a wallet.

Topics: x402 mcp · x402 mcp server · mcp x402 · x402 model context protocol · paid mcp tools · mcp pay per call

x402 MCP server: give your agent paid tools

Add the server to your MCP host

Try it free

What the agent gets

FAQ

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