What are the requirements for proving funds when entering Thailand without a visa?

Okay, let's go over the times you're likely to be asked for proof of funds and what you can use to meet those requirements

When you enter the country you can be asked for proof of funds and in that instance it HAS to be cash. While the posted rule is 10K baht entering visa exempt immigration officers have been known to ask to see 20K baht (or the equivalent).

The other time is when you BUY a visa from a thai consulate in another country and in that instance it HAS to be banked money.

If I stay in a family house, how can I prove my accommodation when I get in on visa exception?

if you're asked, cash.

And it can be in any currency. EURs are the best for transporting that amount - especially if you got a 500 EUR note.

Cash is required. They don’t care what’s in your bank account.

I heared lady's talking about walk-in closets. a Walk-in Visa does not exist. If you come to Thailand without a Visa 54 countries are eligible for the 30 day Visa Exempt Entry. The Immigration Officer can ask for proof of funds: 20.000 Thb or equivalent curreny in CASH, proof of accommodation and onward travel.