The SoftBank capital raise comes at a time when investor sentiment on cryptocurrencies has soured amid regulatory crackdowns in China, Britain and Japan.
Mercado Bitcoin will use the funds to scale its operations, expand offerings, and invest in infrastructure to meet rising demand for crypto in the region, 2TM said in a statement.
Amazon saw over $5.6 billion in total online sales in the United States on the first day of its Prime promotional event, according to Adobe Digital Economy Index.
The world's largest and most popular cryptocurrency last traded down more than 6% at $38,293 after holding the $40,000 level for most of the Asian and London sessions.
"Four administrators and personnel of the company were detained on Saturday on allegations of fraud," Mehmet Nadir Yagci, a prosecutor in the southwestern city of Mugla said in a statement.
Vebitcoin announced on Friday that it had stopped all activities "in order to fulfil all regulations and claims".