This isn't really a question but more a suggestion; I'm not sure if this is the right place for that, but here it goes...

LastPass Support

Is there a way for a quick share a one time-only secret to someone without LastPass account?

Lastpass could have a option to share information securely with self-destructing link; The sender will get a generated link and once viewed its purged, Sender will get back a notification back with date/time when that occurred.

Best regards,

Luis

LastPass Support

Hello @LUÍS TAVARES​

Welcome to the LastPass Community .

I am afraid that this is not possible. The receiver must have a LastPass account in order for you to share an item. They can obtain a free premium trial at any time via lastpass.com. Once they do that, then you may start sharing your sites/passwords with them.

Please let us know if there is something else we can do for you.

Greetings!

Heyner | Customer Care