APR vs APY in Binance and OKX Earn: How to Calculate Real Yield

APR and APY are useful comparison labels, but neither is a promise that your account will receive the headline number. The product’s rules, balance tiers, borrowing demand, fees, lock-up period and changing rate all affect the result. Read the product page and its terms before depositing funds.

APR: the simple annualized rate

APR is a non-compounded annualized rate. A rough estimate is:

estimated return = principal × APR × time

For example, 1,000 USDT at a constant 5% APR for 30 days would be approximately 4.11 USDT before product-specific fees and changes: 1,000 × 0.05 × 30 / 365. It is an estimate, not a guarantee.

Some products calculate returns hourly or use lending demand to determine the effective rate. OKX’s Simple Earn Flexible FAQ gives a product-specific example where hourly return is based on lent amount × APR / 365 / 24 × 85%. That 85% factor is part of that product’s stated rule; it must not be applied to every Earn product or every platform.

APY: annualized return with compounding

APY assumes that earned rewards are reinvested according to a specified compounding schedule. A simplified formula is:

APY = (1 + APR / n)^n − 1

where n is the number of compounding periods per year. Real products may distribute hourly, daily, at maturity or under a different rule, so the displayed APY should be read together with the product’s calculation method.

Why the headline rate can be higher than your result

• Tiered rates: the highest rate may apply only to a limited balance band.
• Variable demand: lending or on-chain reward rates can change after subscription.
• Fees: a platform may retain a share of the gross return.
• Eligibility: KYC, region, asset and account requirements can limit access.
• Lock-up or redemption rules: you may not be able to withdraw immediately.
• Product risk: smart-contract, counterparty, liquidity and market risks can affect access or value.

A 10% banner on the first tier does not mean every dollar earns 10% for a full year. Calculate each balance tier separately, then subtract the stated fee or platform share.

A five-question product check

1. Is the rate fixed or variable?
2. Does the rate apply to the whole balance or only a tier?
3. Is the displayed number APR, APY, estimated APR or a promotional rate?
4. How are returns calculated, distributed and reduced by fees?
5. Can you redeem immediately, and what risks could delay redemption or cause loss?

Record the rate, timestamp, asset amount and product rules when you subscribe. A later screenshot of a different rate is not proof that your original return was guaranteed.

Bottom line

Use APR for a simple annualized comparison and APY when compounding is explicitly defined. For a real estimate, follow the product’s own formula, tiers, fees and rate-change rules. The correct question is not "What is the biggest percentage shown?" but "What amount is eligible, for how long, under which calculation and risk conditions?"

Official references: OKX Simple Earn Flexible FAQ, OKX Auto Earn rules and OKX Earn overview.