Stablecoin APY comparison

Stablecoin yield ranges from 0% (sitting in an exchange wallet) to 20%+ (volatile farming pools with heavy reward emissions). The sweet spot for most holders — safe, liquid, 4-8% APY — sits in T-bill-backed stables (USDY, USDM), lending protocols (Aave, Morpho), or platform savings (Coinbase Earn, Nexo).

This tool lets you compare net APY across venues after protocol fees and gas. Plug in your principal; see annualized USD yield across 5+ options.

The yield environment shifts with the Federal Reserve rate. When the Fed Funds rate is at 5.25-5.50% (as in 2023-2024), T-bill-backed stables and lending protocols pay 5%+. When rates drop to 2%, those same venues compress to 2-3%. Yield-hungry holders chasing 8-12% in low-rate environments take on meaningful tail risk that is often mispriced.

Gas costs matter more than most holders realize. On Ethereum mainnet, depositing into Aave and withdrawing monthly costs roughly $50-120/year in gas at 30 gwei. On $10,000 principal earning 5%, that gas bill cuts your effective APY to 4.4%. On Arbitrum or Base, the same transactions cost under $5/year total. Layer 2 yield strategies consistently outperform mainnet equivalents for positions under $100,000.

Which stablecoin is actually safe?

USDC (Circle): fully backed by cash and T-bills, monthly attestations, regulated in US and EU. Safest option for large balances. USDT (Tether): largest by supply, backed by mixed-quality reserves, has never broken peg materially but attestation quality is lower. DAI (MakerDAO): originally decentralized, now 60%+ backed by real-world assets (mostly USDC and T-bills). Well-battle-tested. FRAX, USDe: newer, hybrid-algorithmic — higher yield, higher risk.

How to read a real APY vs marketing APY

Protocols advertise base APY plus token incentives. Aave might show 3.5% base plus 1.8% in AAVE rewards — total 5.3%. But if you immediately swap the AAVE rewards back to USDC, you eat swap fees (0.1-0.3%) and potential slippage. Your realized APY depends on how frequently you compound rewards and at what cost. Always find the base APY (non-token portion) first.

Boost programs inflate headline numbers temporarily. A protocol might offer 15% APY for the first 30 days of a new pool launch, funded by their own treasury. These promotions drop off quickly. A pool advertised at 15% APY in week one typically settles to 4-6% within 60 days as capital floods in. Track base APY from third-party data aggregators like DeFi Llama, not the protocol's own UI.

Variable vs fixed rate matters too. Aave and Compound rates fluctuate daily based on utilization. A pool earning 6% today might earn 2% in three months if borrowing demand drops. Fixed-rate protocols (Notional, Element Finance) lock a rate for a term at a slight discount to the current variable rate. For $100K+ positions with a defined horizon, fixed rates eliminate the guesswork.

Platform risk: what actually happens if a protocol fails

Smart-contract failure (exploit): an attacker drains some or all of the pool. Aave has been exploit-free since launch; Compound lost $80M in a governance incident in 2021 (accidentally sent to wrong addresses, not an attacker, partially recovered). Euler Finance lost $197M in March 2023 and recovered most funds through negotiation — an unusual outcome. If a protocol you're in gets exploited, the loss is typically permanent.

Platform insolvency (centralized venues): Celsius, BlockFi, and Voyager paid 6-10% APY on stablecoins, then went bankrupt in 2022. Depositors received cents on the dollar after years of proceedings. This is different from DeFi exploits — it is fraud or mismanagement. Mitigate by using only exchange platforms with transparent reserves and regulatory oversight (Coinbase, Gemini, Kraken).

Regulatory shutdown: a regulator orders a platform to stop operating and freeze withdrawals. This happened to Nexo in Bulgaria and several Asian countries. Funds were eventually returned but lockups lasted months. Regulatory risk concentrates in platforms operating in gray areas. U.S.-regulated platforms (Coinbase, Gemini) face the lowest shutdown risk, though they pay less.

Tax treatment of stablecoin yield

Interest income from stablecoin lending is ordinary income in the US, taxed at your marginal rate (up to 37% federal). This applies to Coinbase Rewards, Aave supply APY, and Maker DSR. There is no long-term capital gains treatment for interest. On $10,000 in yield, a 32% bracket holder owes $3,200 in federal tax, netting $6,800 after-tax — 4.5% APY becomes roughly 3.1% after-tax.

Some jurisdictions treat DeFi protocol rewards differently from simple interest. The IRS has not issued specific guidance on whether Aave supply yield is 'interest' or 'other income.' Both are taxed at ordinary rates, so it does not change the dollar amount owed. Track every claim event — each time you harvest rewards is a separate taxable transaction. Use Koinly, Cointracker, or Taxbit for DeFi tracking.