US EIN validation API

One GET, one JSON body, no registry fee and no rate limit: the IRS Employer Identification Number (United States) verified against its own check digits - nine digits with a valid IRS campus prefix.

Request

curl -H "Authorization: Bearer $API_KEY" \
  "https://autorev.rohnelt.dev/v1/identity/validate?type=ein&value=12-3456789"

Response

{
  "type": "ein",
  "valid": true,
  "formatted": "12-3456789",
  "details": { ... }
}

valid is a boolean you can branch on at the form boundary; formatted is the canonical rendering to store, so your database stops holding six spellings of the same number.

Try the response without a key

Result appears here.

Important limitation, stated plainly

A checksum proves the number is well-formed. It does not prove the number was ever issued, nor that it belongs to the person presenting it. Any vendor claiming otherwise from a checksum alone is overselling. Use this to reject the ~90% of bad input that is simply mistyped, then use an official registry for the rest.