You open a yield comparison table, see dozens of pools on Arbitrum, and immediately spot one offering triple-digit APY. The sensible-looking 3.6% option suddenly feels boring. That instinct — to chase the biggest number — is exactly what gets beginners into trouble.

What the Numbers Are Actually Telling You

APY (Annual Percentage Yield) is the return you'd earn over a year if everything stayed constant. It rarely does. A high APY can come from genuine protocol revenue, but more often it's paid out in the protocol's own reward tokens. When those emissions slow down, or when the token's price drops, the real return shrinks fast.

TVL (Total Value Locked) is the total amount of money sitting inside a pool or protocol. Think of it as a rough measure of how much scrutiny a protocol has received. A pool with hundreds of millions of dollars locked has been used by a lot of people — that's not a safety guarantee, but it does mean more eyes have looked at it.

On Arbitrum right now, the largest pool by TVL is USDS on Spark Savings, sitting at roughly $360 million with a 3.6% APY. That combination — large pool, modest yield — tells a story worth understanding. The APY is low partly because the pool is large and well-established. More capital chasing the same yield compresses the rate. A smaller pool with a 40% APY is telling you the opposite: high reward, far fewer participants, and far more uncertainty about whether that yield lasts.

Why Comparing Beats Picking

No single number tells you whether a pool is right for your situation. APY without TVL context is just noise. A stablecoin pool at 3.6% and a volatile-asset pool at 3.6% carry completely different risk profiles. Smart-contract bugs, liquidity thin enough to trap your funds, and token prices that erode your gains are all real possibilities — on any chain, including Arbitrum.

The most useful habit you can build is looking at multiple pools side by side before forming any opinion. The comparison table lets you filter Arbitrum pools and see APY and TVL together in one view.

Before you look at any single yield, ask yourself: what's the TVL, what asset is involved, and where is the yield actually coming from? Those three questions will take you further than any APY figure on its own.