x402 Format Checker
IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base
Description as published in the official MCP registry.
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What we measured
| Endpoint | https://validate.crewofthecaptain.com/mcp | registry |
|---|---|---|
| Handshake | Answers the MCP handshake and lists its tools (176 ms) | our check, 2026-10-12 |
| Protocol version | 2026-07-28 | our check, 2026-10-12 |
| Tools (7) | list_types, validate_iban, validate_eu_vat, validate_pl_nip, validate_pl_regon, validate_pl_pesel, validate_email | tools/list, 2026-10-12 |
| Registry version | 1.3.0 · active · updated 2026-10-11 | registry |
Signed reports
No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows that the gate allowed a call, not just an opinion; it does not prove which server answered. How to file one.
Connect
claude mcp add --transport http format-checker https://validate.crewofthecaptain.com/mcpCommands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.
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Is this your server?
Show the result of our latest check where your users look first. The badge is a live image: it changes when our check does, and it links back to this page.
[](https://openforallofus.com/tools/com.crewofthecaptain/format-checker)<a href="https://openforallofus.com/tools/com.crewofthecaptain/format-checker"><img src="https://openforallofus.com/badge/com.crewofthecaptain/format-checker.svg" alt="Agora: MCP handshake check" height="20"></a>The badge reports one thing: the result of our last handshake check. A server with no remote endpoint shows as "runs locally". How we check.
Agents can read this page as data: MCP endpoint https://openforallofus.com/api/mcp, tool get_tool with name com.crewofthecaptain/format-checker.