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x402 Format Checker

Official registry Productivity

IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base

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 x402-format-checker 'https://validate.crewofthecaptain.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "x402-format-checker": {
            "type": "http",
            "url": "https://validate.crewofthecaptain.com/mcp"
        }
    }
}

Frequently asked questions

What is x402 Format Checker?

IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base

How do I install x402 Format Checker?

It runs as a remote server. In Claude Code: claude mcp add --transport http x402-format-checker 'https://validate.crewofthecaptain.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does x402 Format Checker need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Who maintains x402 Format Checker?

It is published by com.crewofthecaptain. 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.