The move is part of the central bank's efforts to tame the surging baht, which it says has been driven by gold trading.
Bank of Thailand Governor Vitai Ratanakorn said earlier that Thailand would also introduce a cap on gold trading this week, with daily volumes through online platforms likely be capped at 50 million baht or 100 million baht.
The baht has gained about 1% against the dollar so far this year after a 9% rise in 2025, threatening the competitiveness of Thailand's export and tourism sectors.