Bulk Card Number Validator (Luhn), Offline

Chinese Identifier Validation Toolkit

prizable_aster/chinese-identifier-validation-toolkit

Privacy-safe China ID card, USCC, bank card Luhn, mobile number, and postal code validation API with masked results.

Production-grade SA ID validation.

EU VAT Number Validator & KYB Checker

act2labs/vies-vat-verification

Bulk-validate EU VAT numbers against the official VIES service. Offline checksum pre-filtering, member-state outage detection, consultation numbers for audit evidence, and company-name matching.

Australian Medicare Number Validator

seemuapps/medicare-validator

Validate one or more Australian Medicare card numbers using the official weighted checksum algorithm and return structured results.

IBAN Validator — Structure, Checksum & Bank Code

sourcerow/iban-validator

Validate IBANs in bulk against the ISO 13616 registry — structure, length, mod-97 checksum, plus the country, the bank code and why an invalid one is invalid. No external service is called.

NL Test Data Generator: BSN, IBAN, Credit Card

codeclouds/nl-testdata-generator

Generate checksum-valid, safe-to-use test identifiers for QA: RvIG-reserved test BSNs, mod-97 NL IBANs, official Visa/Mastercard/Amex sandbox card numbers, Dutch phone numbers, and bonus KvK/BTW formats.

Intl Test Data Generator: UK NINO, BE RRN, DE Steuer-ID

codeclouds/internationale-testdata-generator

Generate checksum-valid test identifiers for UK/BE/DE software QA: UK National Insurance Numbers (HMRC-reserved ZZ prefix), Belgian Rijksregisternummer, German Steuer-ID, mod-97 IBANs and Visa/Mastercard/Amex sandbox card numbers — each record labeled with an explicit guarantee level.

EU VAT Number Validator: VIES Check with Company Name

f0rty7even/vat-validator

Validate EU VAT numbers in bulk against VIES, the European Commission's official service. Returns whether each number is registered and active, the trader name and address where the country publishes them, and a consultation number you can keep as proof of the check.

Bulk IBAN Validator & Formatter, Offline

comall-agency/iban-validator-formatter

Validate IBANs fully offline: country length from the ISO 13616 registry (78 countries), mod-97 checksum, BBAN extraction and clean 4-character formatting. The verdict says why a value failed, and expected_length beside actual_length makes a bad paste obvious. No bank lookup.

Pokemon Card Japan Sold Prices — Raw vs Graded per Card

jpmarketdata/japan-tcg-sold-comps

Type a Japanese card name and get what each card sold for on Yahoo! Auctions and Mercari, by set, number and rarity. Returns median sold prices (sold comps) for raw and graded copies apart, the PSA/BGS multiple and a shop ask. $0.02 per name, charged only when a sale matches a card. Unofficial.