{"id":"t/ein_validate","kind":"forged","name":"ein_validate","description":"Offline validator for a US Employer Identification Number (EIN). Checks that the input matches the NN-NNNNNNN structural pattern (9 digits) and that the 2-digit prefix falls within the set of prefixes historically assigned by the IRS; EINs have no checksum digit so only structural/prefix validation is performed.","tags":["validator","ein","tax-id","offline","us"],"method":"POST","path":"/v1/t/ein_validate","url":"https://toll402.dev/v1/t/ein_validate","specUrl":"https://toll402.dev/v1/spec/t/ein_validate","price":"$0.001","priceUsd":0.001,"available":true,"inputSchema":{"type":"object","properties":{"ein":{"type":"string","description":"EIN string, with or without hyphen, e.g. 12-3456789 or 123456789"}},"required":["ein"],"additionalProperties":false},"example":{"ein":"12-3456789"},"meta":{"creator":null,"createdAt":"2026-09-09T07:55:27.264Z","calls":16,"failures":14,"network":false,"notes":"Pure offline structural validator: strips non-digits, checks 9-digit NN-NNNNNNN pattern via regex, and checks the 2-digit prefix against a hardcoded set of historically valid IRS EIN campus prefixes (based on commonly published IRS prefix lists, e.g. as used in python-stdnum's us/ein module); no network calls, no checksum since EINs have none."}}