Validates PESEL/NIP/REGON/IBAN/Luhn/ISBN/EAN/SWIFT-BIC/VAT; RPN calc, date math, hashing, tokens
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9 MCP servers, ordered by installs. 9 of 9 are free to start.
Validates Luhn, IBAN, ISBN, EAN/UPC, SWIFT/BIC, and EU VAT checksums and formats.
Date arithmetic: day differences, business days, age, leap years, day-of-week, add/subtract.
Computes MD5, SHA1, SHA256, SHA512, and CRC32 digests from text, base64, or hex input.
Validates Polish PESEL, NIP, and REGON checksums; PESEL also decodes birth date and sex.
Regex matching, email/URL format validation, and JSON Schema validation.
Evaluates Reverse Polish Notation (postfix) expressions: arithmetic, trig, logs, bitwise ops.
Exact character/word counting, reversal, palindrome checks, indexing, sorting; Unicode-safe.
Counts tokens under OpenAI-compatible (tiktoken) encodings, by model or encoding name.
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0 of 9 use OAuth
The rest either hold an API key issued by the publisher or ask for nothing.
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