A zero instead of the letter O
The code is OK66688: capital letters O and K, then the digits 66688. On phone keyboards O and 0 are easy to mix up.
20%off
fees↓
fees↓
Updated 2026-10-18 · OKX referral code help
OKX referral code not working?
OKX referral code not working?
Here’s the fix.
“Invalid code”, “code does not exist”, someone else’s code already in the field, or you only noticed after signing up — the most common referral code problems and how to fix each one. Our code OK66688 gives 20% off spot and futures trading fees for life.
OKX referral code OK66688Invalid · wrong · missed · applied
01 · Why OKX says the referral code is invalidCode invalid?
Code invalid?
Check these six.
Most “invalid code” errors come from how the code was entered. Work down the list — it usually takes a minute.
Spaces or full-width characters
Codes copied from chats often carry spaces or quotes, and full-width letters (ＯＫ) from CJK keyboards aren’t accepted. Switch keyboards and retype.
The account already exists
Referral codes only work at registration. OKX asks for both an email and a phone number when you sign up (OKX account registration guide, updated 11 August 2026), and the same guide says each email and each phone number can be used to register only one OKX account. If either one is already registered, going through sign-up again won’t create a new account or apply a code.
Someone else’s link got there first
If you once opened another referral link, the form may be pre-filled with that code. Clear it before submitting or use a private window.
Browser extensions or cache
Translation and ad-blocking extensions sometimes rewrite form fields. Try another browser or disable extensions.
Your region’s OKX platform differs
OKX runs different platforms and promotions by region, and some regional sites may not support this referral offer. Check that OKX serves your country first.
02 · How to check the OKX referral code appliedDid the code work?
Did the code work?
Three checks.
The code is set once, at registration. A quick look at each of these moments is all it takes.
Before you submit
The referral field shows exactly OK66688, nothing else. This is the step that matters most.
Right after sign-up
In the OKX app, open Menu → Account settings → Profile. If Referral rewards shows up there, a referral relationship is on your account (OKX Referral Program FAQ, updated 5 October 2026).
After your first trade
Open the order details and compare the fee with the standard rate on the OKX fee page. About 20% lower means it’s working.
Not applied?
Once the account exists, OKX says a referral code can’t be added or changed. You can ask Support in the app, but don’t expect a different answer, and don’t close the account or open a second one to swap codes.Why it can’t be added
03 · Is the OKX referral code worth it?What does the code do,
What does the code do,
and is it worth it?
The code doesn’t change how you sign up — it changes what you pay on every trade afterwards.
01 · How much the code saves
20% off trading fees, for life
Sign up with OK66688 and pay 20% less on spot and futures trading fees. The discount is tied to your account permanently — nothing to renew.
See how much you’d save02 · Can I change my OKX referral code?
Set once, at sign-up
OKX doesn’t let you add or change the code once the account exists, so a missed or mistyped code can’t be fixed later. The quick check before you submit is what counts.
Forgot the code?03 · Binance users joining OKX
Switching exchanges counts too
Coming from Binance or elsewhere and opening your first OKX account? You can still use a referral code.
Binance → OKX04 · Do I still get new-user rewards?
Doesn’t affect new-user rewards
Mystery Box and new-user tasks are issued by OKX under its own rules; entering a code doesn’t stop you claiming them. The Rewards Center has the details.
FAQ04 · How much an OKX referral code saves on feesHow much will
How much will
the right code save?
Estimated from OKX regular-user (Lv1) base rates and a 20% discount. Try your own monthly volume.
| Market | Standard | With OK66688 |
|---|---|---|
| Spotcrypto-to-crypto | 0.080% / 0.100% | 0.064% / 0.080% |
| USDT-margined perpetualsUSDT margin | 0.020% / 0.050% | 0.016% / 0.040% |
| Coin-margined futurescoin margin | 0.020% / 0.050% | 0.016% / 0.040% |
| Discount duration | — | For life |
The discount is bound to your account at sign-up and applies to the fees you actually pay. Higher VIP tiers get lower base rates; rates and discounts can change — the OKX fee page is the final word.
05 · Related guidesBeyond the code,
Beyond the code,
questions people ask next.
Missed the code, moving from Binance, not sure whether OKEx is OKX, or just signed up — pick the guide that fits your situation.
Can I add a referral code after sign-up?
Forgot the referral code?
Can you add an OKX referral code after sign-up? Why it can’t be added later, and why a new account won’t fix it.
Which network from Binance to OKX?Moving from Binance to OKX
Transfer crypto from Binance to OKX step by step: networks, memos, test sends and a switching checklist.
OKEx loginOKEx login: OKEx is now OKX
Where to sign in now, why an old OKEx app stops working, and how to spot a fake okex site.
How to start trading cryptoYour first month in crypto
What to do after sign-up: a week-by-week roadmap and the beginner mistakes to avoid.
06 · OKX referral code not working: FAQReferral code
Referral code
problems, answered.
Related questionsOKX referral code not workingOKX referral code invalidIs the OKX referral code worth itCheck OKX referral code appliedAdd OKX referral code after sign upChange OKX referral codeTransfer from Binance to OKXBinance to OKX networkOKEx loginIs OKEx the same as OKXOKEx app not workingFake okex sitesHow to start trading cryptoBeginner crypto mistakes
01Why does OKX say my referral code is invalid?
Usually it’s a typo: a zero instead of the letter O, a stray space, or full-width characters from a Chinese or Japanese keyboard. The other common cause is that the email or phone was already registered — codes only work on new sign-ups. Type OK66688 again (capital O and K, then 66688) or open the referral link so it fills in for you.
02OKX says the referral code does not exist. What now?
Clear the field, switch to a plain English keyboard and type it again. When pasting, make sure you didn’t copy quotes or spaces. If it still fails, open the sign-up page through the referral link, or try another browser or a private window.
03I entered the wrong referral code. Can I change it?
No. The referral relationship is locked in when you submit the sign-up form and cannot be edited afterwards — which is why it’s worth checking the field before you tap Sign up. Our forgotten-code guide explains why, and why closing the account or opening a second one isn’t the answer.
04The sign-up page already shows someone else’s code.
Your browser remembered a referral link you opened earlier. Delete what’s in the field and type OK66688, or open our referral link in a private window.
05How can I check the referral code worked?
If the field showed OK66688 when you submitted, it’s linked. After your first trade, open the order details and compare the fee you paid with the standard rate on the OKX fee page — about 20% lower means the discount is active.
06Is an OKX referral code worth it?
Yes, if you plan to trade. Skipping it doesn’t stop you from signing up, but you miss a permanent fee discount that can only be set at registration. The more you trade, the more it adds up — try the calculator on this page.
07Do all OKX referral codes give the same discount?
Not necessarily. Pick a code that states its discount clearly and doesn’t expire. OK66688 gives 20% off spot and futures trading fees for life; your account shows the actual rate after sign-up.
08Does this code work in the United States?
OKX runs a separate platform in the US with its own products and promotions, so this referral offer may not apply there. OKX also does not serve some countries — check the OKX Terms of Service for your location first.
09Can the person who referred me see my account?
No. A referral code only links the fee discount and referral relationship. The referrer can’t see your balance, password or trades, and your fees only go down.
10Is this the official OKX website?
No. This is an independent third-party help site. We offer no login, deposits or custody — all sign-ups and trading happen on OKX itself. We may earn a commission if you sign up through our links, at no extra cost to you.
OKX referral code OK66688
Go to OKX sign-up