OKJ (OKCoin Japan) is the Japanese subsidiary of the global OKX exchange. It’s licensed by the FSA and offers one of the widest altcoin selections in Japan, along with staking. I’ve used OKJ for 12 months as my “altcoin and yield” exchange. Here’s everything you need to know.
Why I Chose OKJ as My Secondary Exchange
I use bitbank as my primary (low fees, BTC/ETH focus) and OKJ as my secondary because:
- Altcoin selection: SOL, AVAX, DOT, ATOM, NEAR, and many more — far more than bitbank or bitFlyer
- Staking yields: 3–8% APR on supported chains (no lockup on most)
- Order book fees: Maker 0.02%, Taker 0.18% — competitive
- Stability: No major outages in my 12 months of use
Account Opening (Foreign Residents Welcome)
OKJ accepts any resident of Japan with a juminhyo address. The process:
- Visit okcoin.jp and click “Open Account”
- Provide name, address (must match juminhyo), occupation, source of funds
- Upload My Number card (front + back) and residence card (foreign residents)
- Wait 1–3 business days for KYC review
- Receive PIN by physical mail (4–7 business days)
- Activate using the PIN
The PIN delivery step is the slowest, but it’s standard practice for Japanese FSA-licensed exchanges.
Fee Structure (vs. Other Japanese Exchanges)
| Service | OKJ | bitbank | Coincheck |
|---|---|---|---|
| JPY deposit | Free (bank transfer) | Free | Free |
| JPY withdrawal | ¥400 | ¥550–770 | ¥407 |
| Spot Maker fee | 0.02% | -0.02% | 0% |
| Spot Taker fee | 0.18% | 0.12% | 0% |
| Easy Buy spread | ~2–4% | ~2–4% | ~3–5% |
For order-book trading on major pairs, bitbank still wins on fees. But OKJ becomes competitive once you factor in altcoin availability — most altcoins aren’t listed on bitbank at all.
Staking on OKJ: What I Actually Earn
I stake three coins on OKJ. Indicative annualized yields:
- SOL (Solana): ~6% APR
- DOT (Polkadot): ~12% APR (highest)
- ATOM (Cosmos): ~15% APR (variable)
Important caveat for Japan tax: Staking rewards are taxable as miscellaneous income at the time of receipt, not when you sell. Track every reward distribution — Cryptact and Gtax both support OKJ staking imports.
Quirks Foreign Residents Should Know
- Mostly Japanese UI. While account opening has English forms, the trading interface and customer support are predominantly Japanese. Use Chrome’s auto-translate or Google Lens for screenshots.
- Mobile app is Japanese-only. The desktop browser version is more functional for non-Japanese readers.
- Email confirmations in Japanese. Set up auto-translation in Gmail for okcoin.jp domain.
- Withdrawal limits: ¥10 million per day after Lvl 2 verification (most users get Lvl 2 automatically).
What I Don’t Like About OKJ
- The mobile app interface feels generic and less polished than bitFlyer’s
- Customer support response in Japanese only (English requests get translated answers with delay)
- Margin/futures trading not available to Japanese residents (FSA restriction, not OKJ-specific)
My Recommendation by User Type
- Beginner, BTC-only: Stick with bitFlyer. OKJ is overkill.
- Intermediate, want altcoins: OKJ is the best Japanese option.
- Yield-seeking holder: OKJ wins on staking variety.
- Active trader (BTC/ETH): bitbank’s fees are lower.
Summary
- OKJ is FSA-licensed and safe for Japan residents (including foreign residents)
- Best Japanese exchange for altcoin selection and staking yields
- Slightly higher Taker fees than bitbank but justified by lineup
- UI mostly Japanese — auto-translate is your friend
- Pair it with a low-fee BTC/ETH exchange for a complete crypto setup
Crypto in Japan is a different game than in the US — high taxes, limited products, but solid regulatory clarity. OKJ fits cleanly into that ecosystem and earns its place in any serious Japanese crypto portfolio.
Disclaimer: This article is for informational purposes only and is not investment advice. It does not recommend any specific financial product. Investment decisions are your sole responsibility, and you may lose your principal. Tax rules and financial regulations described here reflect the situation as of 2026 in Japan and may change. Please consult a licensed advisor or the official sources (FSA, NTA, MOF) for the latest information.
