Basa Banco headquarters where it is confirmed that it can be opened by physically going there.
Until few months ago it wasn't possible to open a bank account with just the passport anywhere in Paraguay.
Now (02/06/2026) there is this exception, that maybe will be available in other banks in the near future, or it will be closed/removed again.
It is a "cuenta basica", which means that you can't deposit more then 3 times the "soldo minimo" x month on it, which is in total nearly 9M of guaranì. ($1400/$1500)
After you have the account, if your address is still not visible on the bank statement, you need to ask the support from Whatsapp to fix it:
Basa Banco Whatsapp support
After this, you will also have the proof of residency that can be used to open accounts on other fintech services.
Not tested, but it seems that even Banco Continental permit to open basic account with only passport here:
https://maps.app.goo.gl/1JdAhRYYMGPgxcQP8