# Services from validate.crewofthecaptain.com on Zero

> validate.crewofthecaptain.com serves 6 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/validate.crewofthecaptain.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/validate.crewofthecaptain.com/health.json

## Services

- [EU VAT Number Format Validator](https://www.zero.xyz/c/eu-vat-number-format-validator-eb9b50b1/llms.txt): $0.001/call via x402. Validates the format and checksum of a European Union VAT number, returning validity status and normalized form.
- [x402 Format Checker – Email Validation](https://www.zero.xyz/c/x402-format-checker-email-validation-c0938e24/llms.txt): $0.001/call via x402. Validates the format and syntax of an email address and returns a validity flag, reason, and normalized form, paid per-call via x402 in USDC.
- [Polish PESEL Validator](https://www.zero.xyz/c/polish-pesel-validator-e7e6554a/llms.txt): $0.001/call via x402. Validates the format and checksum of a Polish PESEL national identification number, returning validity status and normalized form.
- [IBAN Validator via x402](https://www.zero.xyz/c/iban-validator-via-x402-40c1c2e3/llms.txt): $0.001/call via x402. Validates the format and checksum of an IBAN (International Bank Account Number) string and returns a normalized form, paid per-call via x402 in USDC.
- [Polish NIP Format & Checksum Validator (x402)](https://www.zero.xyz/c/polish-nip-format-checksum-validator-x402-fbc3aa8b/llms.txt): $0.001/call via x402. Validates the format and checksum of a Polish NIP (tax identification number) via a pay-per-call API using x402 micropayments.
- [Polish REGON Number Validator](https://www.zero.xyz/c/polish-regon-number-validator-8078b225/llms.txt): $0.001/call via x402. Validates the format and checksum of a Polish REGON business registration number via pay-per-call API

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)