Money you plan to spend sits in checking, earning nothing. Coinage is built on one belief: every dollar should be working until the second it's spent. Invest in diversified ETF portfolios called Nests, set a rule like "sell my gains at 5% toward my spending," and live your life. Coinage handles the selling automatically. Spend Match works in reverse: everyday purchases trigger small new investments. Invested and ready to spend, both at once.