30% per year is quite large, and it is bigger than UST. that's why I started doubting this, since yesterday's UST issue I had a bad view on algorithmic stablecoins. plus Justin Sun's poor track record in the crypto space. made me think twice about trusting USDD. it is possible that what happened to UST will be repeated to USDD.
20% of UST seemed very high, then we saw 30% per annum for USDD, but KuCoin surpassed everyone and announced a promotion of 60% per annum for 7 days for USDD stake holders:
https://www.kucoin.com/news/en-usdd-high-profit-staking-enjoy-an-apr-of-60 In this case, the profit received in 7 days will be higher than what you will receive in 1 year in a traditional bank.