More coins, less money: coin or dollar terms
You put one ETH into an earn product. A year later you hold 1.03. Did you make money?
There is no single answer, because it depends entirely on which ruler you measure with. In coin terms you are up 3%, cleanly and unambiguously. In cash terms the answer is decided by where the price went, and it can land anywhere from a solid gain to a double-digit loss. Same position, same twelve months, two opposite verdicts — and most people never consciously pick a ruler. They just reach for coin terms when the price is down and cash terms when it is up.
That is not a semantic quibble. Picking the wrong ruler is how people end up taking a price exposure that swings forty percent in a year in exchange for three percent of yield, while telling themselves they are being conservative. This piece lays both rulers out, works out what yield is really worth once you price it in cash, and ends with one rule worth settling before you go anywhere near a product page.
Two rulers, two different questions
Coin terms count units. One ETH becoming 1.03 ETH is +3%, and nothing the price does changes that number.
Cash terms — fiat terms, if you prefer — count purchasing power in dollars, euros, pounds or whatever you actually spend. You multiply the ending unit count by the ending price, then compare that against what the position was worth on day one. Price is the load-bearing variable here.
Neither is more correct. They answer different questions. Coin terms answer do I hold more coins than I did? Cash terms answer do I hold more money than I did? Which one you actually care about comes down to what this position is eventually meant to turn back into. If it is going to be spent in your local currency, cash terms are your real profit and loss. If the goal is a larger coin count and you have no intention of converting in the foreseeable future, coin terms match the goal.
The awkward part: a product page gives you an annual rate, and that rate is native to coin terms. When it says 5% APR, it is telling you how fast the unit count grows. It says nothing whatsoever about your cash position.
A worked example with opposite answers
The numbers below are a hypothetical, built to show the gap between the two rulers. They are not the returns of any product.
Start: one ETH, priced at USD 3,000, so a starting cash value of USD 3,000. The product advertises 3% APR, leaving you with 1.03 ETH after a year. No compounding, fees or tax in this sketch.
| Price after a year (assumed) | Coin terms | Cash value | Cash terms | Same year, no yield |
| USD 2,400 (down 20%) | +3% | USD 2,472 | −17.6% | −20% |
| USD 3,600 (up 20%) | +3% | USD 3,708 | +23.6% | +20% |
Both rows give the identical coin-terms result of +3%. In cash terms one is a 17.6% loss and the other a 23.6% gain — 41 percentage points apart. Yield contributed none of that spread. Price did all of it.
The line almost nobody calculates
Look one level deeper at those two rows. The same 3% rate pulls the down year from −20% up to −17.6%, worth 2.4 percentage points. In the up year it pushes +20% to +23.6%, worth 3.6 percentage points. Same headline rate, half again as much value in one case as the other.
The reason is straightforward once you see it: the yield is paid in the coin, so when the coin falls, the extra 0.03 falls with it. As a line:
In cash terms, what yield actually contributes ≈ headline rate × (ending price ÷ starting price).
The implication is heavier than the arithmetic looks. A falling price discounts the yield at exactly the moment you were counting on it. No product page will tell you that, and it quietly demolishes a very popular idea — that earning yield on a volatile asset hedges you against a drawdown. Single-digit rates do not offset double-digit falls. The orders of magnitude are not close.
Reading the rate itself has its own set of traps — APR versus APY, prorating by actual days held, tiers that only cover part of your balance. Those are unpacked in APR vs APY. That piece is about getting the number right; this one is about which ruler you hold it against afterwards.
When coin terms are the right ruler
Coin terms fit when growing the unit count is the objective and the position is not earmarked for conversion any time soon. Long-term holders of BTC or ETH usually sit here: the scoreboard is how many coins they hold a year from now, and the cash value in between is noise.
There is a condition attached, though, and it is the hard part: short-term swings in cash value have to stay out of your evaluation entirely. Easy to say. In practice, people who cannot hold that line panic on a bad week using cash terms, then reassure themselves afterwards using coin terms, and end up honouring neither standard.
Worth saying plainly: under coin terms, price is not the risk you should be auditing. Not getting your coins back is — a lock-up you cannot exit, a receipt token that trades at a discount when you want out, a platform or protocol that fails. Coin terms define price moves as "not a loss"; being unable to redeem is a real one. Where those boundaries sit is covered in can you lose principal.
When cash terms are the right ruler
Use cash terms whenever the money has a currency-denominated job — a bill coming due, a tax payment, an emergency buffer — or whenever you are lining it up against a savings account, a money-market fund or anything else quoted in your own currency. Cross-asset comparisons especially cannot mix rulers: putting a volatile asset's coin-terms rate next to a deposit rate compares two numbers in different units, and the conclusion means nothing. How that comparison should actually be run is in Earn vs a bank deposit.
The hard rule under cash terms: every rate quoted on a volatile asset gets discounted by the formula above before it enters the discussion. Three percent on something that routinely moves forty percent a year is not the deciding variable — the price is. Which means the judgement you are really making is do I want to hold this asset, not is this rate attractive. Fusing those two questions into one is where a lot of poor earn decisions begin.
Three product shapes, three places on the map
| Product shape | Principal denominated in | Yield paid in | Gap between the rulers |
| Stablecoin yield | A currency peg | Same asset | Nearly none, while the peg holds |
| Major-asset yield or staking | Volatile asset | Same asset | Entirely price-driven |
| Rewards paid in a different token | Volatile asset | A second volatile asset | Two exposures, watch both |
Row one's "nearly none" carries a condition: the peg has to hold. When it slips, the ruler itself is moving, and even "my principal is unchanged" stops being true. How to choose between stablecoins is in earning on USDT, and the size of the rate gap between the main ones is in USDT vs USDC vs FDUSD.
Row two is where a headline rate does the most damage, and staking belongs here too. Receipt tokens make it stranger still: the unit count stays flat while the redemption ratio climbs, so nothing that looks like income ever appears — the gain lives in the exchange rate. That mechanism is in staking ETH.
Row three leaves you holding two price exposures at once, one on the principal and one on the reward token. Value the reward at the current market price, not at a hoped-for listing price or a headline figure from the campaign. Those are wishes, not numbers.
Pick the ruler first and the product second — never choose a product and then reach for whichever ruler explains the result. Crypto earn products are not principal-protected and not deposit-insured, and a rising unit count is not compensation for a falling price. Advertised rates float and are often tiered so they cover only part of a balance; the rate, term, accrual and redemption rules that apply to you are whatever the official Binance Earn page shows at the time (checked August 2026). The worked example above is hypothetical and nothing here is investment advice.
Three ways people get this wrong
- "More coins means I made money." True in coin terms only, and only while you genuinely have no plans to convert. The moment you do, the statement expires.
- "Yield hedges the downside." The formula above already settled this: the harder the fall, the less the yield is worth. A single-digit rate is not insurance against a double-digit move — the cover is an order of magnitude too small.
- "Choose in coin terms, judge in cash terms." The sneakiest of the three, and the most common. You use coin terms to talk yourself into the volatility, then cash terms to decide whether it worked out, and you lose on both counts. Settle the ruler before you commit, and write it down somewhere you will see it again.
Once the ruler is settled, the next question is whether this money can be locked at all, and for how long. To see roughly what a given amount earns over different holding periods, use the earnings calculator; to pressure-test whether the money should be tied up in the first place, run it through can this money be locked up. The order in which to compare and eliminate products is in how to pick a product.
FAQ
What is the difference between coin terms and fiat terms?
Coin terms count units: one coin becoming 1.03 coins is +3%, whatever the price does. Fiat terms multiply the ending unit count by the ending price and compare that against the starting cash value. They answer different questions — coin terms answer "do I hold more coins?", fiat terms answer "do I hold more money?" Which one applies depends on what this position is eventually meant to turn back into.
My coin balance is growing, so why is my account worth less?
Because the yield is paid in the coin, and the coin fell. In fiat terms, what the yield actually contributes is roughly the headline rate multiplied by the ending price divided by the starting price. A 3% rate over a year in which the coin dropped 20% contributes about 2.4 percentage points, which does not cover a 20% fall — so the unit count rises while the cash value shrinks.
Does the unit of account still matter for stablecoin yield?
Almost, but not entirely. A stablecoin tracks a currency, so the two rulers nearly coincide — as long as the peg holds. If it slips, the ruler itself is moving. And the choice of currency still matters: a dollar-pegged stablecoin leaves anyone who spends in another currency with ordinary exchange-rate risk.