{"id":"t/y_tunnus_validate","kind":"forged","name":"y_tunnus_validate","description":"Offline validator for a Finnish Y-tunnus (Business ID). Parses format NNNNNNN-C, computes a mod-11 weighted checksum (weights 7,9,10,5,8,4,2 applied left to right across the 7 digits), maps the remainder to an expected check digit (0->0, 1->invalid, else 11-remainder), and compares it to the supplied check digit.","tags":["validator","finland","business-id","checksum","offline"],"method":"POST","path":"/v1/t/y_tunnus_validate","url":"https://toll402.dev/v1/t/y_tunnus_validate","specUrl":"https://toll402.dev/v1/spec/t/y_tunnus_validate","price":"$0.001","priceUsd":0.001,"available":true,"inputSchema":{"type":"object","properties":{"value":{"type":"string","description":"Y-tunnus in format NNNNNNN-C, e.g. 1234567-1"}},"required":["value"],"additionalProperties":false},"example":{"value":"1234567-1"},"meta":{"creator":null,"createdAt":"2026-09-09T22:40:56.872Z","calls":3,"failures":2,"network":false,"notes":"Pure offline regex-based parser: extracts 7 digits and check digit from NNNNNNN-C, computes mod-11 weighted checksum (weights 7,9,10,5,8,4,2), derives expected check digit (0 if remainder 0, invalid if remainder 1, else 11-remainder), and compares to supplied check digit; no network calls used."}}