Invite code OK2707: the right way to save 20% on fees
Where to enter it, why you only get one shot, and how to check your rebate.
Once you've bought some crypto, a lot of people end up with a chunk of USDT or coins just sitting there, not doing anything for now. That's usually when you'll spot the "Earn," "Simple Earn," or "Flexible Savings" entry points inside the OKX (formerly OKEx) app, with an APR number next to them that looks pretty tempting. So the question becomes: what is this thing? If I put money in, do I earn interest just by sitting back? Can I lose money?
This piece walks through OKX's Earn products from the start. The point isn't to teach you how to "earn more" — it's to help you tell apart which products are relatively low-maintenance and which ones look tempting but can actually eat into your principal. Because almost everyone who gets burned is someone who never made that distinction.
Tap into "Earn" in the app and you'll see a pile of product names that can look dizzying at first. Group them, though, and it gets clear. From low-maintenance to brain-melting, it roughly breaks down like this:
| Product | In plain terms | Flexibility |
|---|---|---|
| Simple Earn (flexible) | Park idle coins, deposit and redeem anytime, collect a little floating interest each day | Most flexible |
| Fixed | Lock funds for a set term (e.g. 7 / 30 days), slightly higher rate but no early exit | Medium |
| Dual investment | A structured product that may convert you into another coin at maturity — can lose principal | Low |
| On-chain / DeFi | Putting coins into on-chain protocols for yield; involves smart-contract and impermanent-loss risk | Low |
Among these, Simple Earn — i.e. flexible savings — is the tier built for beginners. The logic is the simplest: you deposit, the platform pays you floating interest, and you can pull it out whenever you want. The others either lock your funds or carry price risk themselves, so they're not the kind of thing you can put money into and forget. The rest of this article digs into that distinction.
These are the two terms beginners mix up most. One line to tell them apart: flexible means "you can get it back anytime"; fixed means "you can't touch it for an agreed period."
For anyone just getting started, our advice is blunt: use flexible first. Not because fixed is bad, but because when you're new your funds often still need to move around — you might want to add to a position one day, or cash out. Having your money locked in a fixed term right then leaves you stuck. Once you've got a clear handle on your own cash flow, you can think about putting a slice of long-idle money into fixed.
You can deposit lots of coins into Earn — BTC, ETH, all kinds of altcoins. But for beginners, we only suggest you touch one to start: USDT flexible savings. The reason is a single line, and it's the most important one:
USDT is a stablecoin pegged 1:1 to the US dollar, so its price barely moves. Deposit 1,000 USDT and a while later it's still roughly 1,000 USDT, just with a bit of interest added. That means the small interest you earn from flexible savings won't be wiped out by a coin price crash.
Flip it around: if you put BTC into flexible savings, even at a 5% rate, all it takes is BTC dropping 20% over that period and you're still down in fiat terms — that bit of flexible interest is almost nothing against price swings. So:
Put simply, dropping the idle USDT you won't need short-term into flexible savings is like not letting it just sit there doing nothing — it's the closest thing to "low-maintenance" among the Earn products. If you want to first understand what USDT even is and whether it's safe, see What USDT is and why everyone buys it first.
The USDT flexible APR you see today might be different tomorrow. That's completely normal — flexible rates float by design, moving up and down with market supply and demand, platform promotions and other factors.
So in this article we deliberately don't pin down any specific rate. Any content that writes a flexible rate as "fixed X%" is either out of date or just wrong. If you really want the number, go by what the OKX official Earn page shows right now — that's the live figure that actually applies to you.
This section is the most important in the whole piece. Most people who lose money on Earn aren't unlucky — they treated a high-risk product as if it were high-yield flexible savings. Here's everything ranked from lowest to highest risk:
This is the lowest-risk tier. In the vast majority of cases you can deposit and redeem at will and the interest keeps coming. But remember one thing: it's a platform product, not a bank deposit. There's no deposit insurance, and no "guaranteed payout" promise of any kind. Think of it as "relatively low-maintenance," not "absolutely principal-protected."
The principal risk itself is close to flexible, but it adds liquidity risk: you can't pull the funds out during the lock period. If you suddenly need cash, or want to buy a dip, you're stuck.
Dual investment often dangles a particularly tempting APR, but that high number has a price. It's a structured product: in short, if at maturity the price has moved a certain way, your principal gets force-converted into another coin at an agreed price. In other words, you're carrying real price-movement risk and can lose principal. It is absolutely not "high-yield flexible savings" — beginners, steer clear.
This involves smart-contract risk, impermanent loss, protocols running off with funds and more — both the learning curve and the risk are high for beginners. Until you can judge these risks on your own, taking part isn't advisable.
The action itself is simple — three steps in the app:
Open the OKX app, find "Assets" on the bottom bar or home screen, then tap into "Earn" (some versions call it "Finance" or "Grow").
In the product list, find USDT's "Simple Earn / flexible" option. Make sure it's the flexible tier (deposit and redeem anytime), not fixed, and definitely not dual investment.
Type in how much USDT you want to deposit and confirm. From then on it accrues interest at the floating APR; when you want out, tap "Redeem" and it usually lands quickly.
That's all there is to it. The whole process has no subscription fee, and you can always see how much interest has stacked up.
It suits you if:
It doesn't suit you if:
Savings and Earn both rest on first having an OKX account. On the sign-up page, remember to open the invite-code field, enter OK2707, then submit — your trading fees get partly rebated afterward.
Sign up on OKX now →Invite code OK2707 · signing up through this site costs you nothing extra · Earn products are not principal-protected, crypto prices are highly volatile, investing carries risk — use only money you can afford and decide for yourself. See our disclaimer.