Strike has launched Bitcoin Interest on Cash, a feature paying US individuals a 3.6% annual percentage yield on eligible cash balances in Bitcoin rather than dollars. Interest accrues daily and is settled monthly in sats, with payments triggered only when daily interest exceeds $0.01. Users must opt in through the Strike app; there is no minimum or maximum balance. Strike’s example, based on a Bitcoin price of approximately $85,000, shows an $8,000 balance producing about $288 in annual Bitcoin income, or roughly 338,824 sats. Cash is held at Cross River Bank and insured by the FDIC up to $250,000 per depositor, while Strike says Bitcoin holdings are maintained one-to-one in multi-signature cold storage and are not lent or rehypothecated. The product is separate from Strike’s Bitcoin-backed lending options and extends the platform’s broader effort to provide Bitcoin-focused payments, saving and borrowing services.