77 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Validate a currency amount: tests the value against a well-known currency amount pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks...
Validate email address: checks syntax, whether the domain exists and accepts mail (MX records), disposable or temporary email domains, role addresses (info@, admin@), free webmail providers and SPF/DMARC presence, then r...
JSON validator and formatter: parses the text, reports the error with position if invalid, otherwise returns pretty-printed and minified versions, the top-level type, key count, depth and size. Fix agent-generated JSON f...
Cheap structural IBAN validation: ISO 13616 checksum + per-country structure/length. Returns valid plus, on rejection, a granular error_type (invalid_checksum, invalid_length, invalid_structure, invalid_country), the cou...
Postal / ZIP code format check: the expected pattern and an example for 30 countries, and whether a given code matches it. Address validation without an address API. $0.01 per check.