# Package io.vertx.ext.auth.otp.hotp

- Interface Summary
  Interface | Description
  --- | ---
  HotpAuth | An extension of AuthProvider which uses the one time passwords based on counter to perform authentication.

- Class Summary
  Class | Description
  --- | ---
  HotpAuthOptions | Options configuring HOTP authentication.
  HotpAuthOptionsConverter | Converter and mapper for `HotpAuthOptions`.