x402 Seller MCP Server

by entreprisedaney33-rgbio.github.entreprisedaney33-rgb/x402-seller-mcpv0.1.1

Pay-per-call MCP tools (crypto/DeFi data, web reading, AI tasks) in USDC over x402 on Base.

0Node.jsstdioofficial registry

context tax

queued

security

queued

cold start

queued

freshness

Maintained35d ago

Install x402 Seller MCP server

claude mcp add entreprisedaney33-rgb -e BUYER_PRIVATE_KEY='<buyer-private-key>' -- npx -y x402-seller-mcp

{
  "mcpServers": {
    "entreprisedaney33-rgb": {
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "entreprisedaney33-rgb": {
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

{
  "servers": {
    "entreprisedaney33-rgb": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "entreprisedaney33-rgb": {
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

Configuration

Variable	Required	Secret	Description
BUYER_PRIVATE_KEY	—	yes	EVM private key (0x...) of a throwaway wallet funded with a small amount of USDC on Base. Leave unset for explain-only mode (tool calls describe the 402 payment challenge instead of paying).
X402_ORIGIN	—	—	Which x402-compatible server to expose as MCP tools.

Freshness

Maintained — last maintenance signal 35d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-09-05 · 35d ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-09-02 · 38d ago · official registry · v0.1.1

FAQ

›How do I install the x402 Seller MCP server in Claude Code?

Run: claude mcp add entreprisedaney33-rgb -e BUYER_PRIVATE_KEY='<buyer-private-key>' -- npx -y x402-seller-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does x402 Seller require an API key?

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

›Can I use x402 Seller as a remote (hosted) MCP server?

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

›Is x402 Seller in the official MCP registry?

Yes, as io.github.entreprisedaney33-rgb/x402-seller-mcp.