If you have some USD available, you are probably searching for the best staking rewards. A well-known DeFi protocol is Anchor on Terra blockchain, backed by LUNA. However, as you may know, there is a risk of decrease of the yield (currently 19.5% APR) since it regularly needs to be refunded in order to distribute these yield rewards to UST holders on Anchor. The latest refunding was for $1 billion. Although LUNA is successful, it is likely that the limit will soon be reached and next time Terra may not have enough reserves to fund at this level again, what might jeopardize the Anchor protocol.
Therefore, it is worthwhile to look at alternative options. One option is on Avalanche network (one of the most decentralized blockchains) through Beefy Finance protocol, which is one of the most secure DeFi protocols (please DYOR, as usual). They currently offer 19.23% APY on Curve aTriCrypto vault:

As this vault is 30% stablecoins + 30% BTC + 30% ETH, its volatility is relatively low, while at the same time it offers a bit of exposure to ETH and BTC.
Therefore, it is a good way to maximize your USD staking rewards. The price to pay is a partial exposure to ETH and BTC, which might be a good bet since they are both close to their mid-term supports, and the risk linked to the DeFi protocol itself, linked to Beefy Finance, Curve and Ripae. The riskiest part is Ripae, which initially comes from Fantom blockchain. However, their protocol was audited by Obelisk and the report released on March 2. Therefore, you can check this report to DYOR as usual.
Below a few referral links to earn more cryptos...
- Elrond: earn $10 EGLD
- Legion Network: earn $5 LGX
- Helium Staking: 10% referral discount
- Helium Rent: earn HNT by renting a shared hotspot