OKJ exchange profile: Japan accounts, trading fees and platform migration

OKJ’s dealer screen uses the funding account and presents buying and selling quotes. Its order book uses the trading account and mainly matches customer orders. The two routes can produce different execution conditions; available balances in one account should not be confused with funds already available to the other. Dealer execution can also fail temporarily when liquidity is insufficient.[33]

The migration notice inspected on 21 October leaves the end date undecided, despite retaining an earlier 16 October target. Upgrade cancels outstanding orders, transfers trading balances to the funding account, and requires a transfer back before order-book trading. Old and upgraded order books are separate, with possible liquidity and spread effects during the transition.[4]

From 8 October 2026, OKJ began stopping trading in 30 assets on the old screen, including LINK, SUI and BNB. The notice directs customers to the upgraded screen and cancels unfilled orders in the affected legacy markets. An asset remaining listed therefore does not mean it remains tradable through an account’s old interface.[5]

The 10 October NIGHT announcement scheduled its start for 13 October and described a total catalogue of 55 assets after listing. NIGHT’s order-book availability was limited to the upgraded environment, alongside dealer, recurring-purchase and transfer services. That catalogue count is a dated company figure, not a measure of active users or trading volume.[6]

The upgraded purchase guide documents both app and PC order submission. The user selects the market, side and order type, reviews the proposed instruction and confirms with the trading password. The final confirmation is separate from selecting a market or viewing an available balance.[32]

Conditional limits include post-only, which cancels a would-be taker execution; FOK, which requires an immediate full fill; and IOC, which cancels an unfilled remainder. A triggered stop submits a limit instruction, so its trigger is not a guaranteed execution price.[9]

Rates include tax. Tiers use all order-book pairs and update at 16:00 daily. Fees are deducted from the received asset: base crypto on purchases, quote currency on sales, rounded upward beyond eight decimals. For a 0.2 BTC purchase at 0.14%, commission is 0.00028 BTC and receipt is 0.19972 BTC, before any withdrawal.[8]

Account opening and maintenance are free. That published account charge is separate from trading, withdrawal and programme costs; it does not establish a guarantee that an account can never be restricted or closed.[31]

Dealer trading has no separately stated commission, but uses different buy and sell quotes. The quoted conversion cost therefore matters alongside the order-book commission comparison.[33][8]

Large OTC uses individually accepted prices. Its quote orders cannot be cancelled once submitted under that mechanism.[7]

OKJ describes yen deposits and withdrawals as available around the clock, with possible delays and bank maintenance exceptions. Only accounts in the customer’s own name are accepted. Its stated GMO Aozora maintenance window runs from 21:50 on the second Saturday to 06:00 on Sunday. Bank maintenance can prevent crediting even while a trading interface remains accessible.[12]

The yen-deposit FAQ imposes neither a minimum deposit nor a maximum deposit amount. That concerns incoming yen only: it should not be interpreted as an unlimited trade size or as the absence of withdrawal fees, bank limits or compliance checks.[26]

Crypto withdrawals require the asset, matching network, address, any required memo or destination tag, recipient relationship and transfer purpose. The documented confirmation process uses a trading password and verification codes. The screen also lets the customer select a withdrawal fee within the permitted range; this should be read as a transfer cost, not a guarantee of a particular confirmation time.[13]

OKJ’s 15 October LSK notice scheduled a transfer suspension from 19 October 2026 at 12:00 and resumption of transfers, dealer trading and recurring purchases on 22 October at 17:00 as it moved to Ethereum-based LSK. The scheduled restart date has passed. The notice still presents that timetable with a possible timing change; it does not independently confirm that resumption completed.[34]

After that migration, OKJ says it will support only Ethereum-based LSK and delete saved LSK withdrawal addresses. Customers will need to verify the receiving service’s Ethereum support and register the destination again. An address retaining a familiar format does not make the old transfer route valid.[34]

The 30 July Travel Rule notice lists restricted destinations, including Binance Japan, bitFlyer, Coincheck and Crypto Garage, and imposes restrictions linked to overseas providers and recipient residence. Previously saved addresses can become unavailable. Destination eligibility should be checked separately from blockchain compatibility; a technically valid address can still be disallowed by the exchange’s transfer controls.[27]

The current spot agreement names SBI Clearing Trust as trustee for segregated customer money. It describes business-day procedures to hold 100% of customer cryptoassets in cold wallets, with multiple-department approval and at least two people for movements. This is the operator’s custody description, not a customer-specific insurance guarantee.[9]

Recovery of a deleted or reset Google Authenticator requires contacting OKJ and providing a selfie with identification and a dated note identifying the requested removal. A recovery request and a crypto withdrawal are distinct processes. The cited recovery page does not promise a completion time or specify a fixed post-reset withdrawal hold.[14]

For an account lock, the operator instructs customers to contact support so that it can carry out the unlock procedure. Repeatedly resubmitting a trade or withdrawal is not the documented account-recovery process. The help page does not establish an automatic unlock interval.[29]

The US-person FAQ includes a residence test rather than restricting the rule to passport nationality alone. An applicant with US residence or permanent-residence connections needs to check that definition. Japanese residence by itself does not override the separate US-person exclusion.[24]

Corporate applicants provide a company registry certificate, identification for the trading representative, and a power of attorney when that representative differs from the company representative. OKJ can request additional material according to the business and legal form. Corporate access therefore requires a separate application rather than treating an individual account as a business account.[25]

A support form is a route for reporting a problem. It should not be treated as an accepted replacement order or a promise to execute at an earlier price. During the present migration, customers also need to establish which environment held the order before asking the operator to investigate its status.[5]

The Financial Services Agency’s register dated 30 September 2026 identifies オーケーコイン・ジャパン株式会社 under Kanto Local Finance Bureau registration 00020, registered on 30 March 2020. Its Japanese corporate number is 8030001122337. This entry concerns the Japanese cryptoasset exchange operator; it does not extend global-group permissions or product access to this account.[2]

The company profile identifies the operator’s English name as OKCoin Japan K.K. and gives 19 September 2017 as its establishment date. Its disclosed Tokyo office is at Toranomon 1-2-10, Minato-ku. The local legal identity is the relevant reference for contracts, support and regulatory checks.[1]

A July notice changed the public domain from okcoin.jp to okj.com from 22 July 2026, following the August 2024 service-brand change. Old links were to redirect to the new domain. Current help and contractual documents use the OKJ domains; this change of web address should not be interpreted as a newly issued financial permission.[3]

Operator

OKCoin Japan K.K.

Exchange model

Centralised

Service scope

Japanese order-book and quoted cryptoasset trading.

Client types

Retail clients; Institutional clients

Pricing publication

Public and quoted pricing

Other names

OKCoin Japan; OKCoinJapan

Pricing scope

Published order-book commissions; dealer and OTC quotes require price comparison.

Funding scope

Own-name yen bank transfers and supported crypto routes.

Custody and asset handling

Client money in a segregated trust; custodial crypto balances.

Client eligibility

Japan residents, subject to screening and US-person exclusions; corporate accounts available.

Support

Online support form; verification required for account recovery.

Authorisation and registration scope

Japanese cryptoasset exchange registration 00020.

Exchange metadata checked 29 Oct 2026Source 1Source 2Source 33Source 23Source 24Source 25Source 9Source 12Source 14

The annual report describes a 16:00 reporting boundary and yen conversions for specified non-yen transactions and rewards. It is an exchange-generated record, not a determination of every customer’s tax liability. Cross-platform transfers and activity outside OKJ may require reconciliation with records held elsewhere.[11]

API v5 is for upgraded accounts; the reference directs non-upgraded accounts to v3 and provides a compatibility path. It supports REST and WebSocket access and allows up to 20 IP addresses per key. The exchange-wide pending-order ceiling is 4,000, with 500 per instrument for the listed ordinary order types. Unused fields in the documentation do not establish additional live products.[30]

Staking assets remain locked until cancellation and the applicable unlock processing completes. The release time depends on the asset and when cancellation is requested. A displayed cancellation instruction therefore should not be equated with an immediately spendable funding balance.[16]

For fixed staking plans, early cancellation incurs a charge equal to 100% of rewards received during staking. The charge is taken from the staked assets before unlocking. For example, if the relevant rewards total 0.04 units, the stated early-cancellation charge is 0.04 units; reward receipts should be considered when assessing what becomes available after cancellation.[17]

Recurring purchases can include an optional staking instruction, but the minimum staking quantity may prevent that follow-on application. The purchase schedule and the later staking status should therefore be checked separately. Buying an asset through a schedule does not itself show that the entire purchased quantity has entered a staking plan.[19]

Lending uses its own contractual agreement and locks the selected assets. Its terms should be assessed separately from ordinary spot custody or staking: this profile does not import a spot-account protection claim into the lending arrangement or present an unverified current annualised yield.[20]

To close an account, OKJ asks the customer to log in and submit the request through the enquiry form after withdrawing yen and disposing of or transferring crypto balances. Download any needed CSV files and reports before requesting closure. Free maintenance and account closure are separate subjects; the closure instructions do not establish a fixed inactivity countdown.[28]