Buy USDT with baht

PromptPay does not buy USDT. It moves baht into an exchange, and you buy USDT there. The exchange link on this page is Bybit. Open that screen for the fee. This page does not say Bybit holds a Thai SEC licence.

Item	Bitkub	Bybit
PromptPay baht deposit	No fee	On the Bybit screen
Minimum deposit	20 baht	On the Bybit screen
Maximum per deposit	Bank limit applies	On the Bybit screen
Trading fee, baht pairs	0.25%	On the Bybit screen
Trading fee, crypto pairs	Per published schedule	On the Bybit screen
Baht withdrawal to bank	Per published schedule	On the Bybit screen

Avoid roughly 23:30 to 02:00 Thai time. Bank rails have a maintenance window then and baht deposits or withdrawals can hang. That is not the exchange failing.

First run takes thirty minutes to a day depending on the verification queue

Open the Bybit link on this page, or a Thai-licensed exchange such as Bitkub, with an email and phone number you actually use
Complete identity verification with a Thai ID card and a face scan. This is required by law and cannot be skipped
Link a bank account in your own name. Third-party accounts are rejected
Send baht via PromptPay above each platform's minimum
On the trading screen, pick the USDT and baht pair and buy. A limit order beats a market order slightly if you are not in a hurry
Only then open the casino cashier and read which network it wants before sending anything

Round-trip cost

People count one leg. You pay the trading fee twice, once buying USDT and once selling it back to baht, so around half a percent total, plus spread, plus a network fee that is trivial on Tron, plus whatever baht withdrawal fee the screen shows. This page does not print a 20 baht Bybit fee. Not large, but better known in advance.

On tax, kept separate

Ministerial Regulation No. 399 (B.E. 2568), published in the Royal Gazette on 5 September 2025, exempts personal income tax on gains from selling crypto through operators licensed by the Thai SEC, for income arising between 1 January 2025 and 31 December 2029.

Do not join those two thoughts. That exemption concerns disposal of digital assets through licensed operators. It says nothing about gambling income. I am not a tax adviser. If your amounts are meaningful, get professional advice.

Next: pick a network Legal status ฉบับภาษาไทย

Can I skip identity verification

Not legally. Licensed Thai operators must run KYC. Anyone offering a shortcut is offering you a problem.

Can I use an e-wallet instead of a bank

Deposit channels differ by platform and change often. Check the funding page of the exchange on the day you plan to do it.