sharing an interface

No, you will just pay for him once.

Billing is done by the workspace, so any combination of workspace sharing, base sharing, or interface sharing with one particular person will only result in one charge for that person.

Hope this helps! If you’d like to hire the best Airtable consultant to help you with anything Airtable-related, please feel free to contact me through my website: Airtable consultant — ScottWorld

Hey ​@yonatan halperin,

Scott is right. For further context, please check Airtable’s pricing page as well as FAQ below. A User is pretty much an email address (e.g. mike@demo.com is still one user even if he is shared 2 interfaces, bases, or any other combination, as long as those correspond to the same workspace).
 

 
Mike, Consultant @ Automatic Nation

I have written an article on different ways you can share an interface with cost breakdown. Choose the option according to your usage and budget.

Taha, Airtable Advisor