Well if you want essentially risk-free, perhaps a GS Marcus account? It's now paying 2.25 -2.75%OP is asking about a risk free product. SWVXX manages a US Gov't debt portfolio to maximize the rate while removing the day-to-day transaction cost for the retailer.
https://www.marcus.com/us/en
There are restrictions; if memory serves, only 6 withdrawals per year.
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