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Fortytwo MCP

Official registry Developer tools

Ask high-complexity questions where the best answer is required — coding, hard reasoning, and more.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http fortytwo-mcp 'https://mcp.fortytwo.network/mcp' --header 'X-PAYMENT: <x402Escrow payment header (USDC on Base or Monad). Required for paid tool calls.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "fortytwo-mcp": {
            "type": "http",
            "url": "https://mcp.fortytwo.network/mcp",
            "headers": {
                "X-PAYMENT": "<x402Escrow payment header (USDC on Base or Monad). Required for paid tool calls.>"
            }
        }
    }
}

Frequently asked questions

What is Fortytwo MCP?

Ask high-complexity questions where the best answer is required — coding, hard reasoning, and more.

How do I install Fortytwo MCP?

It runs as a remote server. In Claude Code: claude mcp add --transport http fortytwo-mcp 'https://mcp.fortytwo.network/mcp' --header 'X-PAYMENT: <x402Escrow payment header (USDC on Base or Monad). Required for paid tool calls.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Fortytwo MCP need an API key?

Yes. It expects X-PAYMENT, which you set in its configuration.

Who maintains Fortytwo MCP?

It is published by network.fortytwo. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.