X402 API MCP Server

by fernsugiio.github.fernsugi/x402-apiv1.0.5

Eight paid DeFi tools: prices, gas, swaps, token security, holders, yields, funding and wallets

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Active9d ago

Install X402 API MCP server

claude mcp add x402-api -e X402_WALLET_PRIVATE_KEY='<x402-wallet-private-key>' -- npx -y @x402-api/mcp-server

{
  "mcpServers": {
    "x402-api": {
      "command": "npx",
      "args": [
        "-y",
        "@x402-api/mcp-server"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "<x402-wallet-private-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "x402-api": {
      "command": "npx",
      "args": [
        "-y",
        "@x402-api/mcp-server"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "<x402-wallet-private-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "x402-api": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@x402-api/mcp-server"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "<x402-wallet-private-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "x402-api": {
      "command": "npx",
      "args": [
        "-y",
        "@x402-api/mcp-server"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "<x402-wallet-private-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
X402_API_BASE_URL	—	—	x402 API base URL (default: https://x402-api.fly.dev)
X402_WALLET_PRIVATE_KEY	—	yes	Base wallet private key for optional EIP-3009 auto-pay. Default mode inspects payment requirements without paying.
X402_MAX_PER_CALL_USDC	—	—	Maximum USDC allowed per automatic tool call (default: 0.01)
X402_REFERRAL_SOURCE	—	—	Optional referral label: github, glama, nohumans, bazaar, mcp, eliza, demo or test. Default mcp.
X402_EXPECTED_PAY_TO	—	—	Expected payment recipient; defaults to the official x402-api wallet. Change only when using a trusted alternative deployment.

Freshness

Active — last maintenance signal 9d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-09-30 · 9d ago · GitHub
Latest release
2026-09-30 · 9d ago · GitHub · v1.0.5
Package published
no data · npm/PyPI
Registry entry updated
2026-09-30 · 9d ago · official registry · v1.0.5

FAQ

›How do I install the X402 API MCP server in Claude Code?

Run: claude mcp add x402-api -e X402_WALLET_PRIVATE_KEY='<x402-wallet-private-key>' -- npx -y @x402-api/mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does X402 API require an API key?

Yes. It expects X402_WALLET_PRIVATE_KEY, of which 1 is a secret.

›Can I use X402 API as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is X402 API in the official MCP registry?

Yes, as io.github.fernsugi/x402-api.