Strike, the Bitcoin-focused financial app founded by Jack Mallers, launched a new feature called Stacks on October 7, 2026. It allows users to divide their Bitcoin holdings into up to five named buckets, each with its own fee-free recurring purchase plan. Transfers between stacks and the main balance are free and unlimited, but any withdrawal to an external wallet must first pass through the main balance. Strike also launched Bitcoin Interest on Cash simultaneously, offering a 3.6% yield on USD balances, converted directly to Bitcoin.
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