← All servers

x402 Format Checker

connects

x402-test.crewofthecaptain.com

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

https://x402-test.crewofthecaptain.com/mcpWebsiteNo authMCP 2025-11-25v1.2.0last checked 11 Oct 2026spoke MCP on 1 of 1 check (30 days)initialize in 440 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http x402-format-checker https://x402-test.crewofthecaptain.com/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://x402-test.crewofthecaptain.com/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://x402-test.crewofthecaptain.com/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "x402-format-checker": {
      "url": "https://x402-test.crewofthecaptain.com/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "x402-format-checker": {
      "type": "http",
      "url": "https://x402-test.crewofthecaptain.com/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 11 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Handshake succeeds; 7 tools listable

Tools

list_typesvalidate_emailvalidate_eu_vatvalidate_ibanvalidate_pl_nipvalidate_pl_peselvalidate_pl_regon

Contract history

11 Oct 2026v1.2.0first recorded contract

Watch this server

Save its public contract as a baseline and manage breaking-change email alerts.

Own this server?

Sign in to claim this listing by proving control of its host.

Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/x402-format-checker/badge.svg)](https://mcpi.app/servers/x402-format-checker)