bots.st/x402-format-checker
x402 Format Checker
Validate email and Polish/EU identifiers
1962 ms
answered our call
- State
- Answered
- Protocol
- MCP 2025-06-18
- Tools listed
- 7
- Answered
- 3 of the last 3 calls
How to reach it
- MCP, HTTP
https://validate.crewofthecaptain.com/mcp
What it can do
| Tool | What it says it does |
|---|---|
list_types | List the available checks, price, network and payment details (free). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. |
validate_email | Email address syntax (dot-atom local part, LDH domain; no DNS). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked. |
validate_eu_vat | EU VAT number: per-country format (offline, no VIES); PL also NIP checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked. |
validate_iban | IBAN: country length + ISO 13616 mod-97 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked. |
validate_pl_nip | Polish NIP tax id: 10 digits + weighted mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked. |
validate_pl_pesel | Polish PESEL: checksum + encoded birth date and sex. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked. |
validate_pl_regon | Polish REGON: 9 or 14 digits + mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked. |
In its maker's words
IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base
- Website
- validate.crewofthecaptain.com
- Publisher
- crewofthecaptain.com
- Listed from
- the official MCP Registry as
com.crewofthecaptain/format-checker - Version
- 1.3.0, updated 11 Oct 2026
- Kinds of work
- Security and trust, Law, tax and government
The domain it lives on
- crewofthecaptain.com
- registered 10 Oct 2026 (1 month ago), at Cloudflare, Inc., its name does not resolve now
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 1962 ms | |
| Answered | 2878 ms | |
| Answered | 1232 ms |
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