What Is an Exchange UID and How Do You Find It?

To look up your UID, log in to the exchange and open your avatar or profile menu: the UID is the string of digits next to your nickname or email, usually with a copy button beside it. On the Binance app, for example, tap the "Account Center" icon at the top left and the UID sits above your nickname; on the Bybit app, go to "Home" and tap the "Profile" icon at the top left, and the UID is at the top left of the profile page (both from the exchanges' help pages, checked 2026-10-18). Your UID stays the same until the account is closed, and nobody can log in or move your funds with it. Binding a rebate needs only the UID, never your password or an API key. The table below covers where to find it on all 15 exchanges we support.

You have opened your exchange account and you want a rebate platform to hand back part of your trading fees. The first thing you are usually asked for is a string of digits: your UID. Many people get stuck right here: they are not sure what a UID is, where to find it, or whether handing it over is safe. This guide explains what a UID is and walks you through binding your UID and starting to earn rebates on our fee-rebate data platform (Fee Otter).

What is an exchange UID?

A UID (User Identifier) is the unique numeric account ID that an exchange assigns to you automatically the moment you register. It is different from your login email, phone number or nickname: an email can be changed and a nickname can be swapped, but your UID stays fixed from sign-up to account closure. It is how the exchange recognizes you as one specific, non-duplicated identity in its system. Bitget's help page says the same: the UID is generated automatically, cannot be changed, and each account has exactly one.

Think of a UID like a bank account number. Someone who knows your account number can send money to you, but they cannot use that number to withdraw your funds. A UID works the same way: it is simply a publicly visible identity number that carries no password and no withdrawal permission, so a UID string alone can never move your assets.

How is a UID different from an API key or your password?

• UID: a read-only identity number used to recognize who you are; sharing it does not hand over control of your assets.
• Account password: your login credential, equivalent to your house key, which should never be given to any person or platform.
• API key: an authorization key for programmatic trading and queries, with permissions that can be broad; it is never needed for rebate binding, so anyone asking for an API key to "set up rebates" is a red flag.

Where to find your UID on 15 exchanges

This table follows each exchange's own help center (checked 2026-10-18). Where the official page says nothing, the cell says "not stated officially" instead of a guessed path. Menu names change after app updates, so go by what your screen shows.

For the exchanges marked "not stated officially", look under the personal center, account information or avatar menu; the UID is normally a plain string of digits. If you still cannot find it, send a screenshot to Fee Otter support and we will check it with you. KuCoin's page also says its UID has at least eight digits, which helps you check you copied all of it.

Why does binding your UID let you earn rebates?

To attract new users, exchanges run referral/affiliate programs: when a user registers through a referral code, or later binds their UID under a referrer, the exchange returns part of that user's trading fees to the referrer. A rebate platform passes that reward, which would otherwise be pocketed by the exchange or a large KOL, proportionally back to you, the person actually trading.

The exchange uses your UID to decide whose referral relationship a batch of fees belongs to. So the core of binding is having the platform register your UID as its referral in the exchange back office. From then on, every fee your trades generate can be matched to your UID, and the rebate is calculated back to you. Without a correctly bound UID, the exchange simply has no way to know who to pay the rebate to.

This is why the invite code and the UID work as a pair: the invite code decides which referrer you belong to, and the UID decides who you are. Only when the two line up does the rebate chain hold.

Binding your UID and starting rebates on Fee Otter

Most KOLs out there give you nothing but an invite code, and after you bind you cannot see how much you were actually rebated. On our fee-rebate data platform (Fee Otter), once your UID is bound, you can review every single rebate line by line, and your available balance in the dashboard, and request a withdrawal directly. The whole flow is usually three steps:

1. Register or rebind with our invite code: a brand-new sign-up goes through our link, which fills in the code; if you already have an old account, follow that exchange's rebind flow (links below) to move the referral relationship over to us.
2. Enter your UID on the platform: log in to Fee Otter and paste the UID you found on the exchange into the binding field. Remember, only the UID is needed; never provide your password or API key.
3. Wait for verification: the system checks the exchange referral back office to confirm this UID really sits under us. Once it passes, binding takes effect, and your subsequent trading fees start counting toward your rebates.

That verification step matters: it makes sure the UID you entered matches the actual referral relationship in the exchange back office, so you do not think you are bound while your fees quietly fail to count. A random KOL invite code gives you no such check; you can only take it on trust.

There are three exceptions. BingX pays its 45% automatically, all of it, so signing up with the code is enough and no UID binding is needed. KuCoin also pays its 60% automatically; binding is optional and only confirms the account sits under our code. Bitfinex cannot be bound on Fee Otter at the moment.

Where to find your UID on each exchange

Every exchange keeps the UID on its account information page, though the exact spot differs. Here is one short section for each, with the matching rebind guide; if you already have an old account and want to move your referral over, just open that exchange's rebind page and follow it.

Binance

In the app, tap the "Account Center" icon at the top left; the UID shows above your nickname. On the website, open "Profile" → "Dashboard"; the UID is at the top of the page, and the icon beside it copies it. Binance calls it the User ID (BUID). Through Fee Otter, Binance pays 40% (20% automatic from the exchange plus a 20% Fee Otter extra rebate). See the full steps in the Binance rebind guide. Not registered yet? The Binance registration guide covers sign-up, the invite code and finding your UID.

OKX

On the website, hover over your avatar at the top right and the dropdown shows your UID; to copy it, open "Profile" → "Personal info". In the app, open the menu in the corner and go to "User Center"; the UID is in the Profile section, with a copy button. The OKX referral code is FEEOTTER, already built into our dedicated link, and it gets you OKX 20% auto-rebate + exclusive rewards; ask support about our exclusive OKX rewards and promotions. See the OKX rebind guide. Not registered yet? The OKX registration guide covers sign-up, the invite code and finding your UID.

Bitget

In the app, tap the "My Profile" icon at the top left of Home, then "Profile". On the website, hover over "My Profile" at the top right; the UID appears and one click copies it. The Bitget referral code is FEEOTTER; through Fee Otter, Bitget pays 50% (20% automatic from the exchange plus a 30% Fee Otter extra rebate). See the Bitget rebind guide. Not registered yet? The Bitget registration guide covers sign-up, the invite code and finding your UID.

Bybit

In the app, select "Home" at the bottom and tap the "Profile" icon at the top left; the UID is at the top left of the profile page. On the website, hover over the "Profile" icon at the top right and the dropdown shows it. Note carefully: Bybit's rebate is not a "20% + extra" stacked model but a single combined total of 40% (referral code FEEOTTER), all paid by Fee Otter, calculated differently from the other exchanges, so do not apply the others' logic to it. See the Bybit rebind guide. Not registered yet? The Bybit registration guide covers sign-up, the invite code and finding your UID.

Gate

On the website, click your avatar at the top right; the UID is in the first row of "Personal Information Overview". In the app, tap the avatar at the top left to open your personal homepage, then tap the top to open your profile; the UID is on the "User Center" page. Gate's help page calls the UID sensitive and asks you not to share it through unofficial channels; the reason is fraud, covered under "Can't find your UID?" below. The Gate referral code is FEEOTTER; through Fee Otter it pays 70% (20% automatic from the exchange plus a 50% Fee Otter extra rebate). See the Gate rebind guide. Not registered yet? The Gate registration guide covers sign-up, the invite code and finding your UID.

WEEX

Tap or click your avatar in the top right (the same on the app and the website); the UID is shown directly below your email address. WEEX does not require KYC, so an unverified account can be bound too. The WEEX referral code is otter123, and futures pay 70% (60% automatic from the exchange plus a 10% Fee Otter extra rebate). See the WEEX rebind guide. Not registered yet? The WEEX registration guide covers sign-up, the invite code and finding your UID.

MEXC

In the app, tap the profile icon in the top left and open "Profile"; on the website, click the user icon in the top right. The page lists your avatar, nickname, email and UID. The MEXC referral code is mexc-FEEOTTER (enter it with the prefix); through Fee Otter, MEXC pays 60% (20% automatic from the exchange plus a 40% Fee Otter extra rebate). Orders placed through the API earn no rebate at all on MEXC. See the MEXC rebind guide. Not registered yet? The MEXC registration guide covers sign-up, the invite code and finding your UID.

XT.COM

On the website, log in and open "Profile" → "Overview"; the UID is shown at the top of the page. In the app, tap the profile icon on Home, then the username area; the account information screen lists the UID. The XT.COM referral code is FEEOTTER, and futures pay 70% (60% automatic from the exchange plus a 10% Fee Otter extra rebate). See the XT.COM rebind guide. Not registered yet? The XT.COM registration guide covers sign-up, the invite code and finding your UID.

BingX

In the app, tap the profile icon at the top left; the UID is next to your avatar, with a copy icon on the right. On the website, hover over the profile icon at the top right and the dropdown shows it. The BingX referral code is FEEOTTER. BingX pays the whole 45% automatically into your account and Fee Otter has no extra layer, so you do not need to bind your UID. On BingX the UID is mainly used for internal transfers, for support, or in the "Referrer's Referral Code or UID" field on the sign-up page. See the BingX registration guide.

KuCoin

On the website, hover over the profile icon to see the UID, or click through to "User Profile". In the app, tap the profile icon at the top left to open the menu; iOS needs version 3.16.0 or later. The KuCoin referral code is FEEOTTER. KuCoin pays the whole 60% automatically, so binding your UID adds nothing; it only confirms the account sits under our code. See the KuCoin rebind guide and the KuCoin registration guide.

Pionex, HTX, Ourbit and CoinW

None of these four has an official help page we could check on where the UID is shown (HTX has one, but it would not load on the day we checked), so look for the string of digits on the personal center or account information page. Rates: Pionex 50% (15% automatic from the exchange plus a 35% Fee Otter extra rebate), code FEEOTTER; HTX futures 50% (30% automatic plus a 20% Fee Otter extra rebate), code FEEOTTER; Ourbit 70% (50% automatic plus a 20% Fee Otter extra rebate), code FEEOTTER; CoinW 60%, all automatic from CoinW, code OTTER. Step-by-step guides: Pionex registration, HTX registration, Ourbit registration and the CoinW invite code.

Bitfinex

Bitfinex is offered on Fee Otter as a referral link only, and its UID cannot be bound. Its 6% refunds the platform fee on lending (Margin Funding), is paid by Bitfinex directly, and has nothing to do with trading fees; see the Bitfinex invite code.

For a full overview of spot and futures maker and taker fees across the exchanges we support, see the table below (the platform's live display is authoritative):

Fees verified on 2026-09-24 (each exchange's official fee schedule). · Methodology

UID vs the other numbers on your account

Exchange accounts carry several identifiers, and mixing them up is the most common reason a binding fails. The UID is the only one a rebate platform needs, and it is the only one that is safe to share.

How to double-check a UID before you submit it

• Copy it, don't retype it: every exchange has a copy button next to the UID. One wrong digit points to someone else's account, and the binding will fail verification.
• Use the account you registered with the code: if you have more than one account on the same exchange, bind the one opened with the Fee Otter referral code. An account under a different referrer cannot pass verification; see the exchange late-entry and rebind rules.
• Pick the right exchange in the form: a Bybit UID submitted under Bitget will not match, even if the number looks right.
• Wait for the daily refresh: bindings are checked against the previous day's data, refreshed daily at 16:00 (UTC+8). If the UID had trading activity the day before, it is approved automatically at that refresh; a UID that has not traded yet is approved at the first refresh after its first trade.

Can't find your UID?

• Check that you are logged in: logged out, the avatar menu only offers log in and sign up, with no UID.
• Your app is out of date: KuCoin says iOS needs version 3.16.0 or later for the UID to appear where its guide describes. Other exchanges rename menus after updates too, so update the app or use the website.
• It isn't labelled "UID": Binance says User ID and Gate sometimes says "User ID" as well; it is the same string of digits. Your nickname and email are not your UID.
• You are in a sub-account: sub-accounts have their own UIDs. For rebate binding, use the main account's UID.
• Someone messages you asking for it: Gate asks users not to give their UID to unofficial channels. The UID cannot move funds, but scammers use it to pose as support or as the exchange, then ask for verification codes or passwords once you trust them. Enter your UID only in the binding field on your Fee Otter member page, and check anyone else who asks.

For Pionex, HTX and every other exchange's referral code, rebate rate and rebind route, see the exchange fact sheets. The term itself is defined in the glossary.

After binding your UID, how is your rebate rate calculated?

Once your UID is bound, each exchange has one fixed rate: the exchange's automatic rebate plus the Fee Otter extra rebate. The live table below is authoritative for each exchange's rate:

A worked example: if you pay 600 USDT in fees on Binance in a month, a 40% rebate returns 240 USDT. If you are already a VIP on an exchange and want to rebind or sign up with another exchange, contact support; we can help you apply for special trading benefits or a higher rebate rate.

Worked example: 200,000 USDT of Binance futures volume

Take a regular user (VIP 0) trading Binance USDⓈ-M futures with taker orders. Binance's help page gives regular-user rates of 0.02% maker and 0.05% taker (Binance futures fee FAQ, checked 2026-10-18; no BNB discount).

Binance's 20 USDT goes straight back into your Binance account. Fee Otter's 20 USDT is settled daily into your Fee Otter dashboard and paid out on request as USDT over BEP20 to the address you bound, with a 1 USDT minimum per request and a 0.015 USDT network fee paid by you. Rebates apply to trading fees only, not to funding or liquidations.

Before binding your UID, look closely at the fee-versus-rebate gap

The real point of binding your UID is to claw back part of the fees you were going to pay anyway. So before choosing which exchange to bind, look closely at each one's raw fee rates and the real rebate gap after binding. See the fee-and-rebate comparison in the table below:

Measured against the common 20% invite code, most exchanges pay 2 to 3.5 times as much through Fee Otter: Binance and Bybit at 40% are 2 times, and Gate, WEEX, XT.COM and Ourbit at 70% are 3.5 times. OKX is a 20% automatic rebate + exclusive rewards, and Bitfinex's 6% covers lending platform fees only, so neither belongs in this comparison. For a fuller comparison of each exchange's program, see our crypto exchange fee rebate comparison; to understand the whole picture of rebates from the ground up, start with the pillar guide, the complete guide to crypto exchange fee rebates.

Our team keeps real trading capital at every exchange and verifies the order and rebate chain with real money, which is what lets us reconcile rebate data line by line.

Common mistakes and cautions when binding a UID

• Entering the wrong UID: one digit too many or too few fails verification, so always use the exchange's one-click copy rather than typing it by hand.
• Binding someone else's UID: the UID must belong to your own account; binding another person's routes the rebate to them.
• Handing over a password or API key by mistake: rebate binding only ever needs the UID; be wary of anyone asking for your password, API key or verification code.
• Entering the UID before rebinding an old account: if your account already sits under another referrer, you usually have to complete the rebind flow first (see each exchange's link above) before binding takes effect.

FAQ

Is there any asset risk in sharing my UID?

No. A UID is only a read-only identity number with no password and no withdrawal or trading permission, so no one can touch your assets with a UID string alone. What you really need to protect are your password, API key and two-factor codes, none of which are needed for rebate binding, only the UID.

Do I need to log in to look up my UID?

Yes. The UID is shown in the avatar menu or profile page after you log in. Every official guide we checked describes a logged-in path, and none offers a way to see your own UID without logging in.

Does my UID ever change, for example if I change my phone number or email?

No. Bitget's help page says the UID is generated automatically and cannot be changed; changing your email, phone number or nickname leaves it the same. Only a new account gets a new UID.

How long does rebinding a UID take to take effect?

Plain UID binding is checked against the previous day's data at the daily 16:00 (UTC+8) refresh: if the UID traded the day before, it passes then; otherwise it passes at the first refresh after its first trade. When it involves rebinding away from a previous referrer, processing times vary by exchange: some are instant, others take several days up to a binding cycle. The actual timing follows each exchange's rules and platform announcements; see the relevant rebind guide.

Can one UID be bound to several rebate platforms at once?

No. An exchange back office recognizes only one referral relationship per UID at a time, so once it is bound under us it cannot simultaneously count for someone else. That is why you should confirm your current referral attribution and rebind first if needed.

After binding, how do I confirm the rebates are actually coming in?

Log in to the Fee Otter dashboard and you can see, line by line, the rebate matched to each trade and your available balance, and request a withdrawal directly. A KOL who only hands over an invite code can't show you this.

How often is my rebate settled?

Daily. The exchange's automatic rebate goes straight back into your exchange account. The Fee Otter extra rebate builds up in your dashboard, and you can request a USDT withdrawal at any time (BEP20, 1 USDT minimum per request, 0.015 USDT network fee).

I already registered with someone else's invite code. Can I still move over?

In most cases yes: use each exchange's rebind flow to move the referral relationship under us. The corresponding steps are in the Binance, OKX, Bitget, Bybit, Gate, WEEX and MEXC rebind-guide links above. Each exchange's late-entry windows and rebind methods are summarized in the referral code late-entry and rebind rules table (including the HTX rebind guide). Official references: Bybit's guide to adding and checking a referral code and the MEXC self-service referrer linking guide.

Rules follow each exchange's official and platform announcements. UID paths checked 2026-10-18.

ⓘ Rates shown are for futures; spot: Gate 65%, Bitget 45%, WEEX 45%, XT.COM 45%, HTX 45%.