What is the required bank deposit for a one-year extension on a Guardian Non-O visa in Thailand?

I’m pretty sure it’s 400K for guardian visa. It might be 500 but certainly not 800

For 1-year extension based on supporting a foreign child (Guardian), you need to have 500K baht in your account (800K is for a retirement visa/extension).

The general rule is, you must have 500K baht in your account for 30 days before your first application for a 1-year extension from Non-O visa 90 days stamp.

Then, you have to keep 500K baht in your Thai bank account for 3 months for every subsequent yearly extension application.