USDT Interest Rates: Compare Tiered APR and Actual Earnings

The best USDT interest rate is the one that produces the most usable income for your balance and holding period under terms you can meet, with acceptable custody and liquidity risks. A headline APR alone cannot answer that question: balance tiers, promotional limits and trading requirements can change the result.

A live USDT offer shows why the balance matters

MEXC's Earn Plus event beginning November 12, 2026 advertises 12% APR on the first 50,000 USDT and 13% on the next 50,000 USDT. Promotional principal is capped at 100,000 USDT. The announcement describes benefits lasting at least 20 days; the product display, eligibility and final settlement govern actual payments.

These are balance portions: crossing 50,000 USDT does not reprice the first portion at 13%. The table uses the published tiers over a 20-day horizon.

Calculation: add each tier's principal multiplied by its APR, then multiply by 20/365. This illustration assumes unchanged rates, full eligibility for 20 complete earning days and no compounding. Actual hourly accrual, subscription timing, rate changes and rounding can produce a different payment.

Keep promotional capacity separate from subscription capacity

The flexible Earn Plus FAQ says there is no maximum subscription limit. That does not override a campaign's 100,000 USDT promotional cap or establish the rate for a larger balance. Check the treatment of every amount above a promotional limit before estimating income.

For 100,000 USDT, applying 13% to the entire balance would produce a 20-day estimate of 712.33 USDT. Under the two published tiers, it is 684.93 USDT: a 27.40 USDT difference. The highest rate is therefore not the blended rate.

Futures Earn answers a different cash-management need

The Futures Earn upgrade describes USDT at 5% base APR plus up to 15% additional rewards, for a maximum 20% APR. Bonus requirements and principal caps apply; personalized terms can differ. Read the applicable rate on MEXC Futures Earn rather than treating 20% as an automatic rate on every USDT.

Those funds remain in the Futures account. Earn Plus instead requires a product subscription. Opening a leveraged position solely to unlock bonus APR can add trading losses, fees and funding payments that exceed the interest benefit.

USDT itself does not supply either product's return. USDT Earn explained separates the token from the yield strategy.

Compare the planned holding period, not a full-year projection

A campaign APR annualizes a temporary rate. Compare fixed and variable offers over your planned holding period, include conversion and redemption costs, and keep trading profit or loss separate from interest.

For APR-based simple estimates, use principal × APR × days/365. An APY includes an assumed compounding schedule; dividing an APY by 365 does not reproduce that schedule. Also verify whether rewards are paid in USDT or in another token whose price can change.

MEXC's assessment follows from the campaign arithmetic: compare each offer's eligible principal and expected USDT payment before ranking the displayed percentages. The guide to crypto interest accounts adds custody and repayment checks. A higher modeled payment still does not establish lower risk or guaranteed access to funds.