When a platform advertises "12% annualised," you'd assume 10,000 USDT earns 1,200 USDT a year.
But the same "12%" can pay you 1,200 or 1,270, and the difference is one word: compounding.
Worse, some pitches say "5% monthly," which sounds modest until you realise the compounded annual yield is 79.6%, a number that simply does not exist in any honest lending market.
This piece breaks down the common rate terms with real numbers:
APR, APY, daily rate, monthly rate, quarterly rate.
By the end you'll be able to compare any two platforms apples-to-apples, spot common marketing tricks, and read Quiver's own APR display correctly.
1. APR vs APY: what's the difference?
APR (Annual Percentage Rate): a periodic rate multiplied by the number of periods in a year, no compounding.
The formula:
APR = period rate × periods per year
Examples:
- Daily rate 0.03%, APR = 0.03% × 365 = 10.95%
- Monthly rate 1%, APR = 1% × 12 = 12.00%
APY (Annual Percentage Yield): the rate when interest gets rolled back into principal and earns more interest. Always slightly higher than APR for the same underlying rate.
The formula:
APY = (1 + period rate)^periods − 1
Same examples:
- Daily 0.03%, APY = (1 + 0.0003)^365 − 1 ≈ 11.58%
- Monthly 1%, APY = (1 + 0.01)^12 − 1 ≈ 12.68%
How big is the gap? Take 10,000 USDT at 12% annual:
- APR 12%: you take home 1,200 USDT a year
- APY 12.68% (same daily rate, compounded): you take home 1,268 USDT
That's 68 USDT difference on the same capital, same underlying rate. Only the calculation method changed.
2. Why does the gap exist?
The key is whether interest gets reinvested.
Imagine you lend 10,000 USDT at 0.03% daily (= 3 USDT a day):
- No compounding (APR view): each 3 USDT sits idle. After 365 days you've collected 365 × 3 = 1,095 USDT.
- Compounding (APY view): each 3 USDT immediately joins the principal, so day 2 lends 10,003 (earns 3.0009), day 3 lends 10,006.0009, and so on. After 365 days the total is roughly 1,158 USDT.
On Bitfinex Funding, each credit pays its interest at maturity in a single lump (e.g. 2-day, 7-day, or 30-day periods). Interest does not auto-reinvest mid-credit. So your realised yield is closer to APR than APY.
CEX flexible Earn products, on the other hand, often quote APY because they accrue and roll daily (the underlying mechanism is genuinely compounding), so APY is the right number for the user.
If APR, you take that × principal.
If APY, you take that × principal, but only if interest actually auto-reinvests.
3. Converting monthly rates to annual
The most common bait is "X% monthly."
"1% a month" sounds modest, but APR is already 12% and APY 12.68%.
"5% a month" sounds amazing until you realise compounded APY is 79.6%, which doesn't exist in any sustainable lending market.
| Monthly rate | Annual APR | Annual APY (monthly compound) | Plausible? |
|---|---|---|---|
| 0.5% | 6% | 6.17% | Yes (close to banks + stablecoins) |
| 1% | 12% | 12.68% | Yes (Bitfinex Funding median) |
| 2% | 24% | 26.82% | High, occasionally on spikes |
| 3% | 36% | 42.58% | Suspect, not sustainable |
| 5% | 60% | 79.59% | 🚩 Scam pattern |
| 10% | 120% | 213.84% | 🚩🚩 Always scam |
Bitfinex Funding USDT daily rates over the past year typically sat in 0.025% to 0.045%, which translates to APR 9% to 16%.
Spike events can briefly push daily rates above 0.1% (APR 36%+), but the annual average rarely exceeds 20% APR.
Any product claiming sustained "3%+ monthly" should raise red flags.
4. How to read a daily rate
Bitfinex's UI and API both show daily rate, e.g. 0.000354, meaning 0.0354% per day.
To get APR:
APR (%) = daily_rate × 365 × 100
Examples:
- daily 0.000354 → APR 12.92%
- daily 0.000500 → APR 18.25%
- daily 0.001000 → APR 36.50% (rare spike territory)
Bitfinex's FRR (Flash Return Rate) is also expressed as a daily rate.
The "14.23% APR" you see on Quiver is daily rate × 365 of the currently active credit. It's a contracted APR, not APY, not realised yet.
5. All units side-by-side
Spread the common units in one table and the marketing tricks become easy to spot:
| Scenario | Native unit | APR equivalent | APY equivalent (daily compound) |
|---|---|---|---|
| Bank fixed deposit | Annual 1.6% | 1.60% | 1.61% |
| USDT CEX flexible Earn | APY 5% | 4.88% | 5.00% |
| Bitfinex Funding median | daily 0.000333 | 12.16% | 12.92% |
| Bitfinex Funding spike | daily 0.001000 | 36.50% | 44.07% |
| "5% monthly" | monthly 5% | 60.00% | 79.59% 🚩 |
Notice anything? Bank, CEX, and Bitfinex APR vs APY gaps are all small (under 1%), because the periodic rates themselves are small and compounding doesn't bend the curve much.
But "5% monthly" has a periodic rate and a frequency both high enough that compounding pushes APR from 60% to APY 79%+. That gap is the mathematical fingerprint of a number you shouldn't trust.
When someone tells you "5% monthly, capital guaranteed,"
they're really saying "79.6% APY with zero risk."
No legitimate lending mechanism sustains that.
If you see it, walk away.
6. Worked example: where Quiver's 12.36% comes from
Suppose your position averaged 5,000 USDT every day for the past 30 days, and you collected 50 USDT in total interest. The Quiver leaderboard and "realised 30d APR" compute it as:
APR = total interest / total position-days × 365 × 100= 50 / (5,000 × 30) × 365 × 100≈ 12.17%
That's a backward-looking APR, reflecting what you actually earned over the last 30 days.
The "weighted average APR" you see elsewhere on the dashboard is forward-looking: sum of (each active credit's contract APR × proportional amount), so it shows the contract rate of your currently running credits.
Both are correct, they measure different things:
- Realised 30d: past performance, includes the dilution from idle / pending balances
- Weighted avg APR: current active credits only, ignoring offers not yet matched
7. Which number should you actually use?
Depends on the decision:
- Judging if a platform is honest: check how they disclose. Do they distinguish APR vs APY? Show the raw daily rate? Separate "current" from "30-day average"? Vague platforms tend to have something to hide.
- Comparing platforms: convert everything to APR. APY is tied to a specific compounding frequency that varies by platform, so APR is the more apples-to-apples lens.
- Knowing how you actually did this month: look at "realised 30d APR." It captures idle, pending, and spike behaviour honestly.
- Judging the quality of your current open credits: look at "weighted average APR." That tells you the contract rate of what's running right now.
8. Bottom line
Interest rates follow formulas, not vibes.
When you see "annualised," ask if it's APR or APY.
When you see "monthly," compute (1 + r)^12 − 1 and check if the APY is plausible.
When you see "daily," multiply by 365 and check the APR.
Rough market sanity check:
- Bank fixed deposit (USD-side): 4% to 5% APR
- USDT flexible CEX Earn: 3% to 8% APY
- Bitfinex Funding average: 10% to 15% APR
- DeFi lending (Aave etc): 3% to 10% APY
Anything substantially outside these bands deserves scrutiny.
The math is objective. The real market yield for USDT lending sits in these ranges, regardless of how aggressively a platform pitches a higher number.
If you want to see Bitfinex Funding's live daily rate and the corresponding APR / APY breakdown without any marketing dressing, Quiver's dashboard exposes the raw daily rate alongside the converted APR.
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