What is OKJ, the Japanese cryptocurrency (virtual currency) exchange? A thorough explanation of its reliability, features, and how to use it!

In 2025, crypto assets (virtual currencies) were on a weak trend for a while. Since then, as the market has become active again, it has become important for users to trade crypto assets (virtual currencies) efficiently and profitably.

In addition, the important point for users is "which exchange to use". In particular, in Japan, there are currently a large number of crypto asset (virtual currency) exchanges that have been licensed by the Financial Services Agency for crypto asset exchange business, and users are confused about which one to use.

In this situation, an exchange that is currently attracting attention is "OKJ". In recent years, OKJ has been gaining support not only from intermediate and advanced crypto asset (virtual currency) traders but also from beginners. We will comprehensively explain its overview, features, differences from competitors, registration methods, trading functions, and convenient functions.

If you are looking to start crypto asset (virtual currency) trading or are already using other exchanges and are considering switching or using them in combination, please refer to this article.

Overview of OKJ

OKJ is an exchange under the umbrella of OKGroup, which provides cryptocurrency services globally. It is a cryptocurrency exchange that obtained a cryptocurrency exchange license from the Financial Services Agency in 2020 and entered the Japanese market (registration number: Kanto Regional Financial Bureau No. 00020).

It is operated by OKCoin Japan Co., Ltd., which initially provided cryptocurrency trading services under the name "OKCoin Japan," but rebranded to "OKJ" on August 20, 2024, when it celebrated its fourth anniversary.

Features of OKJ 

In recent years, OKJ has been gaining popularity among users for the following reasons:

A complete security and support system

OKJ manages 100% of customer assets in a cold wallet and has implemented two-step authentication and other measures to ensure a rock-solid security system. In addition, OKJ provides thorough support to users, stating "polite and prompt support."

Speedy deposits and withdrawals

The company has a system in place that allows for instantaneous deposits and withdrawals of Japanese yen and crypto assets (virtual currencies) 24 hours a day, 365 days a year. Another advantage is the wide variety of blockchains that are supported for deposits and withdrawals.

Narrow spreads and one of the largest number of stocks available in Japan

OKJ boasts narrow spreads and high liquidity, and offers a trading environment of global standards. It is also known for handling a wide range of cryptocurrency (virtual currency) issues among domestic cryptocurrency exchanges, and is often the first to handle cryptocurrency (virtual currency) in Japan.

High-performance and multi-functional API environment

It supports WebSocket and REST API, making it possible to build a flexible trading environment for various purposes. It also has a high request limit and can handle large amounts of data processing. In addition, it also provides an SDK to support development.

Comprehensive corporate services

OKJ also focuses on corporate services. In addition to handling large-scale transactions, they provide detailed support from dedicated account managers. They also provide tax support, such as handling applications for exemptions from end-of-period mark-to-market tax on crypto assets held by companies.

OKJ has several advantages compared to other domestic cryptocurrency exchanges. On the other hand, it also has disadvantages compared to other companies, which we will introduce below.

Merit

Large number of crypto assets (virtual currencies) available

OKJ currently handles 45 crypto assets (virtual currencies) (as of May 21, 2025). This is a high level compared to other exchanges, and the wide selection of trading stocks makes it possible to broaden the scope of operations.

A wide range of cryptocurrency management options

In addition to common services such as an exchange and sales office, OKJ also offers other services such as staking, flash deals, crypto asset lending, and crypto asset savings.

These services expand the options for managing crypto assets (virtual currencies), and are another motivation for using OKJ.

Generous support for large investors and corporations

OKJ also focuses on supporting large investors and corporations. On April 10, 2025, it launched a service called "OKJ Corporate Premier."

This service allows for relaxed withdrawal and withdrawal limits and immediate response according to trading needs, and also provides general support for the service from a dedicated staff member.

Demerit

Leverage trading not supported

OKJ offers a variety of services, but does not support leveraged trading. Leveraged trading allows you to trade large amounts with a small amount of capital, making it possible to increase profits while taking on more risk.

However, since OKJ does not offer leveraged trading, it is not suitable for users looking to make short-term profits.

Transaction fees are a bit high

OKJ's withdrawal fee for Japanese yen is relatively high, at a maximum of 1,320 yen. In addition, the transaction fee for crypto assets (virtual currencies) is not low compared to other companies, and the fees may become a burden if you make frequent transactions.

In addition to the "Exchange (Order Trading)" and "Sales Office," OKJ also offers several other crypto asset (virtual currency) related services. Here, we will introduce the crypto asset management services offered by OKJ.

Staking

OKJ offers a staking service that supports nine types of crypto assets (virtual currencies) (as of May 21, 2025). With this service, you can earn rewards by applying for the management of the target stocks you hold within the OKJ platform.

There are three plans, and you can choose from the lock periods of "Flexible", "30 days", and "60 days". The longer the lock period, the higher the annual percentage of rewards you can earn.

Flash Deals 

Flash Deals provided by OKJ is a campaign service that allows you to earn high rewards for a limited time. Although it varies depending on the period and the stock, there are cryptocurrencies that allow you to earn rewards of up to 188% per annum (as of May 21, 2025). Like the staking service, you can choose the lock period.

Cryptocurrency lending

This is a service that allows you to earn rental fees by depositing eligible stocks. It started on February 25, 2025, and as of May 21, 2025, it only handles financier tokens (FNCT).

The longer the rental period, the more rewards you can earn. As of May 21, 2025, you can earn an annual interest rate of 8.88% by depositing FNCT for 90 days.

Cryptocurrency savings

As the name suggests, cryptocurrency savings is a service that allows you to regularly purchase and save cryptocurrencies. By purchasing a fixed amount at a fixed time, the acquisition price will be averaged over the long term, making it possible to reduce the risk of price fluctuations.

Savings plans can be selected from "daily," "weekly," "biweekly," and "monthly," and the designated savings amount is 1,000 yen to 200,000 yen (in 1 yen increments).

Opening an account with OKJ is very simple. Account opening can be completed in as little as five minutes, and trading can begin in as little as 15 minutes. This means that if you want to trade crypto assets (virtual currencies), you can start right away with OKJ.

The specific steps are as follows:

1. Register your email address via "New Registration"
2. Set a password and enter basic information
3. Submit identification documents (driver's license, etc.)
4. Once the review is complete, your account will be opened

In this way, the registration process for OKJ is simple and easy even for beginners. Once registration is complete, you can start trading on the same day, so if you have the idea, you can open an account.

So far, we have explained the features and usage of the crypto asset (virtual currency) exchange OKJ, the types of services it offers, and how to open an account.

Considering the wide range of stocks it handles and the extensive support it provides, it is designed to be used safely not only by intermediate and advanced crypto asset (virtual currency) traders, but also by beginners. Also, taking into account the pros and cons, it is an exchange that is especially recommended for users who want to manage crypto assets (virtual currencies) in the medium to long term.

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