You see a staking pool advertising a triple-digit APY (Annual Percentage Yield — the yearly return if rates held steady). It looks incredible. A month later, that same pool shows a fraction of the original number. What happened?
Nothing broke. It was designed this way.
Why APYs Start High
Most new staking pools and DeFi (decentralised finance) protocols attract early users by handing out their own project tokens as bonus rewards. This is called token emissions — the protocol is essentially printing extra tokens and distributing them to anyone who stakes early.
The math works like this: when a pool is new and small, the same fixed bucket of reward tokens is shared among fewer people. Each staker gets a bigger slice. The APY looks enormous. As more people pile in — drawn by that headline number — the reward bucket gets split more ways, and the APY falls. This is front-loading, and it happens on nearly every new protocol.
The catch is that those emission rewards are often separate from any real fee income the protocol generates. When emissions slow down or stop, what's left is the genuine, sustainable yield — which is usually far lower.
The Question Sustainability Actually Answers
Before getting excited about a rate, it helps to ask: where does this yield actually come from?
There are two broad sources. The first is real economic activity — trading fees, lending interest, network validation rewards. These tend to be lower but more durable. The second is token emissions — reward tokens paid out to attract liquidity. These can be generous early on, but they depend on the protocol continuing to mint and distribute tokens at that rate, and on those tokens holding their value.
A high APY built entirely on emissions is a yield that exists only as long as the project chooses to keep printing. If the reward token also falls in price, your percentage return can look fine on paper while your actual holdings shrink in real terms.
One Practical Way to Think About It
When you're looking at any staking option, try to separate the base yield from the bonus token rewards. The comparison table shows APY figures side by side — but the more useful question is whether the protocol behind that number has genuine activity sustaining it, or whether you're looking at an early-stage incentive that's already fading.
That distinction won't make the decision for you, but it will stop a big number from making it for you instead.