No official phone numbers are published by OKJ. All communications are through email and social channels.
OKJ, formerly known as OKCoin Japan, is a Japanese-registered cryptocurrency exchange established in 2017 and officially operating under that name since 2020. In August 2024, the platform was rebranded to “OKJ.” It is licensed by Japan’s Financial Services Agency and supported by the global OK Group. OKJ offers a user-focused, secure trading environment tailored to both individual and institutional users in Japan.
First launched in 2017, fully rebranded as OKJ in 2024.
Operates under Japanese regulation as a registered crypto exchange (Kanto Bureau No. 00020).
Designed for compliance, including cold wallet asset management under strict Japanese legal standards.
Offers both exchange and sales-type trading—catering to beginners and professional traders alike.
Supports over 40 cryptocurrency assets and pairs such as BTC and ETH, including IOTX and various altcoins.
Offers staking, savings products, “FlashDeals” limited-time yields, and specialized corporate services.
Launched “Corporate Premier” services for institutional clients, offering dedicated support and enhanced limits.
Known for fast operational response and leveraging fintech expertise from the OK Group.