Where Exchange Earn Yield Comes From: Borrowing Demand, Staking and the Platform's Cut

The short answer

An exchange earn rate has a payer. There are only two payers in this market, and a product that will not tell you which one it is using has not told you anything about its risk.

1. A borrower. Someone is paying interest to hold a leveraged position, and your deposit is the other side of that loan.
2. A network. A proof-of-stake protocol pays for validation, and your deposit is the stake that earns it.

Both are real cash flows. Neither is free money, and neither is a deposit account. The rate you see is the gross cash flow minus the platform’s cut, quoted as an annual figure, accrued on a clock the platform defines.

This article is about where the number comes from. It is not a product comparison — the OKX Simple Earn versus On-Chain Earn guide covers the choice between the two and their withdrawal terms.

Source one: borrowing demand

OKX’s Simple Earn agreement is unusually explicit about this, and the definition is the most useful sentence on the subject. Returns are defined as “the interest, yield and/or return that a User may receive by depositing its Digital Assets in the Service, provided such Digital Assets are successfully matched with borrowing demand.”

That is a lending product described as a lending product. The payer is a borrower on the venue — someone who has taken the asset to hold a position — and the yield is the price of that borrowing. Like any price it moves with supply and demand: when borrowing demand is high and lendable supply is thin, the rate rises; when a market deleverages, the same product can fall to a rate that does not cover the risk.

Two details in the agreement matter for reading the number correctly.

The first is that the matching language is a condition, not a guarantee of a rate. The agreement also states that the calculation and distribution methodology applies “regardless of whether, or to the extent to which, such Digital Assets have been matched to specific borrowing demand at any given time”. Read together, the two sentences say: the source of the return is borrower demand, and the rate you are paid is produced by a methodology that pools that demand rather than tying your specific coins to a specific loan. That is how a pooled lending product works. It also means your deposit is exposed to the pool, not to a named borrower.

The second is the fee. OKX’s terms state that, as at the time of the terms, the fee for the flexible version of the service “is equivalent to 15% of the Returns generated for you by your use of the Service”, and that the fee is not charged on the fixed-term version. Fifteen percent of the return, not fifteen percent of the principal — a distinction that changes the arithmetic completely.

Source two: staking rewards

The staking route has a different payer and a different failure mode. OKX’s On-chain Earn agreement describes a service that stakes digital assets “on a Staking Protocol(s)”, with OKX acting as a validator, exercising voting rights attached to the staked assets, and holding them for the duration.

The return comes from the network. On Ethereum, as ethereum.org describes it, staking means depositing ETH to activate a validator, and validators earn “rewards in the form of fees and MEV when proposing blocks”. Ethereum requires at least 32 ETH to run a validator, allows up to 2,048 ETH per validator, and offers pooled staking from 0.01 ETH. The same page, last updated February 12, 2025, showed 35% of ETH staked and a 2.5% current APR — a number that moves with the amount staked and with network activity, and which the venue does not control.

That is the structural difference from lending. A staking rate is set by a protocol’s security budget and by how much of the asset is competing to validate. It does not rise because leverage demand rises, and it does not fall to zero when a bull market ends. It does fall when more capital stakes, because the same reward is split among more validators.

The cost structure is also different, and the agreement is candid about the mechanism while leaving the number to the platform. The service fee “shall be published on the OKX Platform”, is deducted from rewards “prior to distribution”, and “may contain fee(s) charged by the corresponding Staking Protocol”. So the APR you see is net of a fee whose composition — platform cut versus protocol cut — is not disclosed line by line. The liquid staking versus native staking guide covers what the protocol-level fee buys and what it does not.

The waterfall, with numbers

Take a gross annual return of 6.00% and run it through the two structures the agreements describe. The example is constructed for arithmetic; it is not a quote for any product on any date.

The point of the table is not the numbers. It is that “6%” appears in a marketing slot and “5.10%” is what accrues, and the difference is a fee on the return rather than on the principal. A 15% performance fee on a 6% gross return costs 90 basis points a year; the same 15% headline on a 12% gross return costs 180. The fee scales with the success of the product, which is why gross rates are the number worth comparing and net rates are the number worth holding.

There is a third component that does not appear in either agreement and does appear in every rate table: promotional tranches. A headline rate assembled from a base rate plus a new-user bonus is a blended number with an expiry date, and the base rate is what remains. If a rate looks high relative to the venue’s other products, the first question is how much of it is a bonus.

The accrual clock decides your first hour

The rate is annual; the accrual is hourly. OKX’s agreement sets the rule precisely:

• Returns accrue and are distributed hourly on a clock-hour basis.
• No returns are generated for parts of an hour.
• If an order is matched during hour T, accrual begins at the start of the next clock hour (T+1) and is distributed after T+1.

The agreement’s own example: an order matched at 09:30 begins accruing from 10:00 and the return is credited after 11:00.

That is a clean rule, and it has a practical consequence that is easy to miss. Two subscriptions placed a minute apart, at 09:59 and 10:01, begin accruing an hour apart. Over a year the difference is noise; for anyone moving a balance between products frequently, the boundary is where the days are lost. The same logic means that a deposit timed just before the hour is not “earning from now” — it is earning from the top of the next hour.

The distribution convention also matters for record-keeping. Hourly crediting produces many small entries rather than one monthly payment, which is good for compounding and awkward for reconciliation. The guide to reconciling an exchange statement treats those small credits as a category of their own, because they rarely match a user’s mental model of “interest paid”.

What each source does when it goes wrong

The two sources fail in different ways, and the failure is the part the rate does not price.

Lending fails through credit. The borrower’s position is liquidated, the loan is repaid, and the pool takes any shortfall. OKX states plainly that Simple Earn is not principal-protected and that users risk losing principal in whole or in part. A venue that ran a tighter liquidation engine than its peers is a better counterparty than one that did not, and that difference does not show up in the APY.

Staking fails through the protocol. Slashing, an unbonding queue, a validator outage, or a withdrawal queue that runs for days are all outside the platform’s control. The On-chain Earn agreement says staked assets may not be redeemed until a period has elapsed and that fast redemption may draw on user order quantity and can be suspended without notice. A 5% APR with a two-week queue is a different asset from a 4% APR available today.

Both fail through the platform. An earn balance is a claim on an intermediary. That is why the proof of reserves versus proof of liabilities question matters even for a product that looks like a savings account: whether the intermediary’s balance sheet covers the claim is a separate question from whether the yield is real.

A four-question check before subscribing

1. Who pays the rate? A borrower or a network. If the product page will not say, the terms usually will.
2. What is the fee, and on what? A percentage of the return is not a percentage of the principal.
3. When does accrual start, and when does it stop? Clock-hour rules, cut-offs, and redemption queues all change the realised rate.
4. What happens to principal in the bad case? “Not principal-protected” is a legal sentence with a meaning, and the meaning is that the risk sits with the depositor.

Risk note. All product terms in this article were read from OKX’s Simple Earn and On-chain Earn user agreements on 2026-10-29, including the fee figures stated as being in force at the time of those terms, and from ethereum.org’s staking page, whose own last-update date is February 12, 2025. Fees, rates, bonus tranches and accrual rules change; the agreements are the operative documents, not this summary. The waterfall table is constructed arithmetic, not a quotation for any product. Digital asset balances are not deposits and are not insured; this article is not investment advice.