Is it possible to have different default currencies per team?

No, it is not possible to have different default currencies per team within a single Putler account. The system allows only one base currency to be set for the entire account, affecting all the teams created under it. If you require different default currencies for separate teams, you would need to create separate Putler accounts for each team and add the relevant data sources to each of them. You can then set different base currencies for each of your Putler accounts.